US 11133031

I'll run targeted searches for this patent number and any associated litigation/docket records.

Let me check for any 2026 appellate activity and confirm the litigation status specific to this patent number.

US Patent 11,133,031 B2 — Summary

Searches run: I searched for the exact number "11133031" against patent databases, PTAB/PTACTS records, and litigation dockets (including 2026 Federal Circuit activity). Below is what is grounded in those results plus the authoritative full text provided.

Bibliographic data (confirmed)

Abstract (as issued)

A multilayer exchange spring recording media consists of a magnetically hard magnetic storage layer strongly exchange coupled to a softer nucleation host. The strong exchange coupling can be through a coupling layer or direct. The hard magnetic storage layer has a strong perpendicular anisotropy. The nucleation host consists of one or more ferromagnetically coupled layers. For a multilayer nucleation host the anisotropy increases from layer to layer. The anisotropy in the softest layer of the nucleation host can be two times smaller than that of the hard magnetic storage layer. The lateral exchange between the grains is small. The nucleation host decreases the coercive field significantly while keeping the energy barrier of the hard layer almost unchanged. The coercive field of the total structure depends on one over number of layers in the nucleation host. The invention proposes a recording media that overcomes the writeability problem of perpendicular recording media.

Plain-language overview of the independent claim

Claim 1 — "A magnetic recording system" (a system claim, not merely a medium claim). It requires three groups of elements:

1. A writing head, together with a disk containing the recording medium.
2. A non-magnetic substrate plus a magnetic bilayer consisting of:
   • a granular hard magnetic storage layer with perpendicular anisotropy, a coercive field H_s (measured without another magnetic layer), and a thickness between 3 nm and 30 nm; and
   • a granular hard magnetic nucleation host with perpendicular anisotropy, disposed on the hard magnetic storage layer in a columnar manner, having a coercive field H_n (measured without the hard layer), where 0.5 T < H_n < H_s.
3. Further requirements: the nucleation host has a magnetic polarization J_s = μ₀M_s between 0.3 T and 1.0 T; the nucleation host and storage layer are separated by a coupling layer of between 0.1 nm and 3 nm; that coupling layer lies directly between the two magnetic layers; and the coupling between them is ferromagnetic.

In plain terms: the claim covers a hard-disk write system whose disk has a hard, granular perpendicular recording layer stacked on a less-hard (but still fairly hard) granular "nucleation host" layer, joined by a very thin (sub-3 nm) ferromagnetic coupling layer. The relative coercivity window (0.5 T < H_n < H_s) plus the polarization and coupling-layer thickness limits are the core distinctions.

Notable narrowing vs. the specification: the specification discusses direct contact, antiferromagnetic coupling, and single-layer hosts, but granted claim 1 requires a ferromagnetic coupling through a discrete 0.1–3 nm coupling layer. Also note an internal inconsistency to be aware of: claim 1 recites 0.5 T < H_n, whereas the specification's embodiment language and claim 10 refer to 0.7 T < H_n — the claims as issued control.

Litigation / docket status (and a caveat)

• Google Patents' litigation records for this family cite three U.S. cases: W.D. Tex. 6:22-cv-00612, C.D. Cal. 8:22-cv-01599, and C.D. Cal. 2:22-cv-06088.
• 6:22-cv-00612 — MR Technologies, GmbH v. Western Digital Corporation, filed 2022-06-13 in the Western District of Texas, patent infringement, now closed. (Ex Parte case page). A contemporaneous report states the complaint asserted four "multilayer exchange spring recording media" patents "issued in 2018 and 2021" (IPR Daily; Law Street Media). The '031 patent issued 2021-09-28, so it is consistent with being among those four, but I could not verify from these sources that '031 specifically was asserted in that case — flagging that as unconfirmed.
• In the related C.D. Cal. case 8:22-cv-01599, PTAB petition materials indicate the patents tried to verdict against Western Digital were US 9,928,864 and US 11,138,997 (with US 12,020,734 asserted in a later, separately settled case). That source identifies the '997 patent as a continuation of the '864 patent, not the '031 patent, though all share the same specification. (USPTO PTACTS petition documents)
• CAFC 2026: I found no Federal Circuit docket or 2026 appeal specifically identifying US 11,133,031. My searches did not return any CAFC appeal records for this number, and I do not have authoritative confirmation of an appeal involving it. Treat any 2026 appellate activity as unconfirmed.

Source-of-record note

The bibliography in the summary above is drawn from the authoritative full text supplied (Google Patents, https://patents.google.com/patent/US11133031/en) and corroborated by the USPTO-hosted PDF and Unified Patents/Onscope bibliographic records. Where a search result would conflict with the supplied text, I have preferred the supplied text.

If you need a definitive answer on whether '031 was asserted in 6:22-cv-00612 or is subject to any 2026 appellate proceeding, the reliable next steps would be the W.D. Tex. docket, PACER for the C.D. Cal. cases, and the Federal Circuit's CM/ECF docket — none of which I can query directly here.

I'll research litigation involving US patent 11133031.

Let me dig deeper into the specific cases identified.

I have substantial results. Let me pin down the two Central District of California case numbers and check the Toshiba action.

Litigation Involving U.S. Patent No. 11,133,031 ("the '031 patent")

Important framing note: The '031 patent is one member of a seven-application family (family ID 38861953) all sharing the 2006-06-17 priority date. In every case I found, the '031 patent was asserted alongside sibling patents (U.S. 9,978,413; 9,928,864; 11,138,997), and in the one case that reached trial the '031 patent was dropped before trial. So no verdict or judgment has ever turned on the '031 patent's claims. I flag this because it is easy to over-read the widely reported $262M verdict as an '031 outcome — it is not.

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Case 1 — MR Technologies, GmbH v. Western Digital Corporation / Western Digital Technologies, Inc.

• Court / jurisdiction: U.S. District Court for the Western District of Texas, Waco Division
• Case number: 6:22-cv-00612
• Filed: June 13, 2022
• Plaintiff: MR Technologies, GmbH (Vienna, Austria)
• Defendant: Captioned as Western Digital Corporation; the complaint body pleads against Western Digital Technologies, Inc.
• Patents asserted: U.S. 9,978,413; 9,928,864; 11,133,031; 11,138,997
• Outcome / status: Voluntarily dismissed. Docket entry #9, "NOTICE of Voluntary Dismissal," dated August 26, 2022 (per the court's AO 120 report to the USPTO).
• Sources: AO 120 report citing W.D. Tex. 6:22-cv-00612, Docket Alarm complaint PDF, Patexia docket entry

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Case 2 — MR Technologies, GmbH v. Western Digital Technologies, Inc. (the main action)

• Court / jurisdiction: U.S. District Court for the Central District of California, Southern Division (Santa Ana) — Judge James V. Selna; Magistrate Judge Douglas F. McCormick
• Case number: 8:22-cv-01599-JVS-DFM
• Filed: August 26, 2022 (same day the Texas case was dismissed)
• Plaintiff: MR Technologies, GmbH — represented by Russ August & Kabat
• Defendant: Western Digital Technologies, Inc. (a Western Digital Corp. subsidiary)
• Patents asserted: U.S. 9,978,413; 9,928,864; 11,133,031; 11,138,997 — confirmed by the AO 120 report filed in the case listing patent no. 11,133,031 (issued date shown as 9/8/2021, holder MR Technologies, GmbH)
• Outcome / status — multi-stage:
  • MRT dropped the '413 and '031 patents as the case progressed; trial proceeded only on the '864 and '997 patents.
  • Jury trial July 2024; verdict July 26, 2024: $262,388,800, a lump sum for past and future use of the '864 and '997 patents.
  • August 15, 2024: judgment entered; the court awarded $117M prejudgment interest (total exposure ≈ $380M).
  • Western Digital moved for judgment as a matter of law / new trial (Sept. 27, 2024); MRT opposed (Oct. 24, 2024).
  • April 2025: the parties reached a confidential global settlement of $130 million covering all pending disputes; joint stipulation of dismissal filed May 16, 2025, and the court dismissed the case (order dated July 8, 2025). Docket Alarm shows the case terminated August 14, 2024 (judgment-stage entry).
• Sources: Docket Alarm 8:22-cv-01599, pretrial order PDF, WDC/SEC legal proceedings disclosure, Law360 case tracker, LexDana case summary

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Case 3 — MR Technologies, GmbH v. Western Digital Technologies, Inc.

• Court / jurisdiction: U.S. District Court for the Central District of California
• Case number: 2:22-cv-06088
• Plaintiff/Defendant: MR Technologies, GMBH / Western Digital Technologies, Inc.
• Filing date: Not stated in the sources retrieved (the Stanford NPE entry leaves the filing date blank)
• Outcome / status: Unknown from the sources retrieved. Caveat: both the Google Patents litigation metadata and the Stanford NPE Litigation Database list this number for the '031 patent, but I could not independently confirm whether 2:22-cv-06088 is a distinct action or an alternative docketing of the 8:22-cv-01599 action (the two share identical party captions). I am reporting the number literally as the databases record it rather than assuming a correction.
• Source: Stanford NPE Litigation Database, patent 11133031; Unified Patents patent page for US-11133031-B2

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No litigation known where the '031 patent went to judgment

Based on the search results, the '031 patent has never been the subject of a verdict, final judgment, or appealed judgment on its own claims. It was asserted twice (W.D. Tex. 6:22-cv-00612 and C.D. Cal. 8:22-cv-01599) and dropped/voluntarily dismissed in both.

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Related family litigation (context — NOT '031 assertions; do not conflate)

These involve sibling patents in the same family and are useful for the '031 patent's commercial/enforcement story, but the '031 patent itself was not asserted:

• MR Technologies, GmbH v. Western Digital Technologies, Inc., No. 24-cv-01848 (C.D. Cal., filed Aug. 22, 2024) — asserting U.S. 12,020,734 (a child of the family); dismissed July 8, 2025 as part of the April 2025 global settlement.
• MR Technologies GmbH v. Toshiba America Electronic Components, Inc., No. 25-cv-00786-JVS-DFM (C.D. Cal., filed April 15, 2025) — before the same Judge Selna. I could not confirm from the retrieved materials which patents are asserted here, so I make no claim that the '031 patent is among them.
• Resonac Hard Disk Corporation / Resonac Corporation IPRs — IPR2026-00014 and IPR2026-00015 against the '864 and '997 patents, plus a petition against U.S. 12,020,734. No IPR against the '031 patent itself was identified. Note: PTAB petition document 1558578 contains "11133031" only as part of a prior-art search query string, not as a challenged patent.
• Litigation metadata on file at the patent office: the Google Patents page for US11133031B2 also carries the Darts-IP "first worldwide family litigation filed" link (family 38861953), which is a family-level flag, not an '031-specific case.

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Sources consulted

• Stanford NPE Litigation Database — patent 11133031 and party page for Western Digital Technologies, Inc.
• Unified Patents Litigation Portal — US-11133031-B2
• Docket Alarm — C.D. Cal. 8:22-cv-01599
• Docket Alarm — W.D. Tex. 6:22-cv-00612 complaint
• USPTO PTAB petition documents (AO 120 reports, IPR papers)
• SEC EDGAR — Western Digital legal proceedings disclosure
• Law360 case tracker

Confidence and gaps: I am highly confident in Cases 1 and 2 (supported by court-generated AO 120 forms, docket records, and the defendant's own SEC filings). I am less confident about Case 3 (2:22-cv-06088): the databases list it, but I could not verify a filing date or confirm it is not the same action as 8:22-cv-01599. I also could not confirm the Toshiba case's asserted patents. I did not retrieve PACER or CAFC dockets directly, so I cannot confirm whether Western Digital's planned appeal of the '864/'997 judgment (reported by LexDana) was ever docketed at the Federal Circuit before the settlement — that question concerns the sibling patents, not the '031 patent.

I'll verify the structured PTAB data against live sources before writing the analysis.

Let me confirm the Resonac petitions' target patents and check for any proceeding naming this patent.

One more check for any 2026 filing naming the '031 patent specifically, plus any ex parte reexam.

Proceedings overview

Zero (0) AIA trial proceedings have ever been filed against US 11,133,031. The structured USPTO Open Data Portal block supplied in this prompt returns no AIA trials for this patent, and independent searching corroborates it: no IPR, PGR, or CBM petition naming the '031 patent appears in PTAB records, PTACTS, or third-party PTAB trackers. Breakdown by status: 0 active / 0 claims invalidated / 0 claims sustained / 0 settled / 0 institution-denied — the categories are simply empty.

Bottom line for a defendant: all ten issued claims (1–10) are completely untested at the PTAB, and no proceeding has ever put a single one of them at risk. There is no Final Written Decision on the '031 patent, therefore no § 315(e)(2) estoppel has attached to anyone on this patent, and the entire prior-art runway — including the printed publications the Examiner distinguished during prosecution (Suess 2004, Suess APL 2005, Hagedorn, Victora, Inaba, Lobo/Fullerton) — remains fully available to a challenger today. The patent is not "hardened" by PTAB survival; it is simply unchallenged. That cuts both ways: the claims have never been construed or tested by the Board, but the same family's claims have proven vulnerable enough to attract three petitions from a media supplier, and the challenged siblings survived only because the Director exercised discretion, not because they were adjudicated valid.

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No proceedings exist for US 11,133,031

There is nothing further to report at claim level for this patent. Two non-proceedings should be explicitly ruled out so the record is clean:

• No IPR/PGR/CBM naming the '031 patent. The string "11133031" does appear in PTAB petition document ID 1558578, but only as one term inside an Examiner's EAST prior-art search query string (("11133031"|"11138997"|...).PN.) in the file history of a sibling application — it is not a challenged patent number on any caption.
• No ex parte reexamination of the '031 patent was identified. (Search coverage on this point was cut short; treat as unconfirmed rather than affirmatively disproven.)

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Adjacent family proceedings — NOT asserted against the '031 patent (context only; do not conflate)

These are the only PTAB proceedings touching family ID 38861953. All three attack sibling patents sharing the '031 specification; none names the '031 patent. They are the best available proxy for how the Board has treated this technology.

IPR2026-00014 — Resonac Hard Disk Corporation and Resonac Corporation v. MR Technologies GmbH (U.S. 9,928,864)

• Type: Inter Partes Review
• Filed: 2025-10-08 (per Petitioners' Power of Attorney, executed by Naotake Ota, Head of IP, dated 2025-10-08; counsel Morgan, Lewis & Bockius LLP, lead counsel Dion M. Bregman)
• Status: Discretionary Denial — institution refused
• Judge panel: Not publicly identified in the materials retrieved
• Petition grounds: Closed caption not retrieved; the Petition record cites Suess 2004 ("Suess et al., Exchange Spring Recording Media for Areal Densities Up to 10 Tbit/in², JMMM 290 (2005) 551–554"), Dobin, D. Suess APL 87:1 (2005), and U.S. Patent No. 6,777,066 ("Chang") as exhibits (Ex-1008/1009/1011/1010), consistent with a § 103 obviousness attack. Claim numbers challenged were not retrieved — do not assume.
• Institution decision: Denied 2026-02-03 on discretionary grounds under 35 U.S.C. § 314(a) (listed alongside IPR2026-00015 in the Director's 2026-02-03 Notice of Decisions on Institution). The merits were not reached.
• Final Written Decision: None. No FWD issued; § 315(e)(2) estoppel never attached.
• Settlement / termination: Not settled — denied at institution.
• Appeal: None identified. A discretionary denial is ordinarily non-appealable in practice (no APA-reviewable merits decision), and no CAFC docket was found.
• Defensive value for the '031 patent: Indirect. It shows the Board is willing to deny institution on discretionary/Fintiv-type grounds even for a serial-assertion campaign — a double-edged signal for a '031 challenger.

IPR2026-00015 — Resonac Hard Disk Corporation and Resonac Corporation v. MR Technologies GmbH (U.S. 11,138,997)

• Type: Inter Partes Review
• Filed: 2025-10-08
• Status: Discretionary Denial (third-party tracker records "Discretionary Denial"; institution decision date 2026-02-03; no termination date shown)
• Judge panel: Not publicly identified
• Petition grounds: Not retrieved at claim level.
• Institution decision: Denied 2026-02-03, § 314(a) discretionary, per the Director's Notice of Decisions listing IPR2026-00014 and IPR2026-00015 together.
• Final Written Decision: None.
• Settlement / termination: None.
• Appeal: None identified.
• Source: IPR2026-00015 case page

IPR2026-00016 — Resonac Hard Disk Corporation and Resonac Corporation v. MR Technologies GmbH (U.S. 12,020,734)

• Type: Inter Partes Review
• Filed: 2025-10-08
• Status: Discretionary Denial (denied at institution; no trial)
• Institution decision: Denied on discretionary grounds in the same 2026-02-03 Director action.
• Final Written Decision: None. Appeal: None identified.
• Source: Resonac Hard Disk PTAB case list

What the Petitioners actually argued (useful for '031 planning): Resonac filed a full Sotera stipulation to neutralize overlap with its co-pending declaratory-judgment action, argued there was no § 315(b) time bar because Western Digital was not an RPI or privy (citing WesternGeco v. ION), and argued the WD jury verdict on the '864/'997 independent claims could not bind a nonparty. Patent Owner MR Technologies countered with Fintiv/discretionary-denial and "settled expectations" arguments, noting the '864 patent's age. The Director sided with the Patent Owner on discretion. Sources: PTACTS petition documents, PTACTS opposition documents.

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Strategic summary

Claim-by-claim status of the '031 patent. There is no PTAB narrowing whatsoever. Claims 1–10 are all UNTESTED — no claim of the '031 patent is canceled, none has been confirmed, and none has been construed by the Board. Contrast this with the family siblings: the '997 and '734 patents' asserted claims were litigated to a jury verdict (Western Digital, 2024-07-26, $262,388,800, plus ~$117M prejudgment interest) and settled globally for $130M in April 2025 before any post-trial or appellate validity testing. The Board has never reached the merits of any patent in this family; the three Resonac petitions died on discretion at institution on 2026-02-03.

Estoppel landscape. Because there is no § 318(a) FWD on the '031 patent, no § 315(e)(2) estoppel applies to any party with respect to it. A defendant asserting invalidity of the '031 patent in district court faces no PTAB-imposed restrictions, and a defendant who files the first IPR against the '031 patent cannot be estopped on this patent by the Resonac denials (denial at institution does not create estoppel). The practical prior-art menu is wide open: the Examiner's Reasons for Allowance for the '031 patent explicitly distinguished D. Suess et al., "Optimization of Exchange Spring Perpendicular Recording Media," Intermag Nagoya, April 2005 as teaching a hard magnetic storage layer (Hc > 0.5 T) exchange-coupled to a gradient-anisotropy nucleation host, and allowed only on the coercive-field relationship (H_n < H_s) and the multiple-ferromagnetic-layers-with-increasing-K features. That is the exact seam a challenger would attack: the granted claim 1 requires only a granular hard nucleation host with 0.5 T < H_n < H_s on a 0.1–3 nm ferromagnetic coupling layer — it does not recite multiple layers with increasing anisotropy. That narrowing target is materially different from (and narrower than) the family claim language the jury upheld.

Pattern signals. (1) Same petitioner, multiple patents, one family: Resonac filed three petitions in one day (2025-10-08) against '864, '997 and '734 — but stopped short of the '031 patent, plausibly because '031 expires 2026-09-05 (adjusted) and offers almost no remaining damages runway. (2) No defensive aggregator: Unified Patents appears only as a litigation-database host (portal page), not as a petitioner; the challenge chain is a competitor/supplier (Resonac, indemnifying Toshiba), not an NPE-defense entity. (3) Patent owner settles rather than appeals: MRT settled the WD case before validity was tested on appeal, and no PTAB FWD exists for it to appeal — so there is no MRT appellate track record at the Federal Circuit. (4) The '031 patent is a prosecution reference, not a litigation weapon: in a sibling application, claims 1–24 were provisionally rejected for nonstatutory double patenting over "Claims 1-10 of US Patent No. 11133031", confirming that the '031 claim set is treated within the family as the broad/simple version — and reinforcing that its ten claims were never asserted at trial.

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Recommended next steps

1. The absence of PTAB activity is itself the headline. Anyone receiving a demand letter citing US 11,133,031 should say plainly: this patent has never been before the PTAB; no claim has ever been canceled, confirmed, or construed. Do not overstate family-level litigation (the $262M verdict and the $130M settlement) as an '031 outcome — the '031 patent was dropped/voluntarily dismissed in both actions where it was asserted (W.D. Tex. 6:22-cv-00612, dismissed 2022-08-26; C.D. Cal. 8:22-cv-01599, where '413 and '031 were dropped before trial).

2. Check the clock before spending on an IPR. The '031 patent's adjusted expiration is 2026-09-05 — approximately three weeks from today. An IPR filed now would not reach an FWD before expiration, and the Board routinely denies institution where the patent will expire before a FWD can issue. Verify the expiration and any terminal-disclaimer/PTO-adjustment posture first; if it is accurate, the commercially rational defenses are district-court invalidity, intervening rights, and damages/expiration arguments, not an AIA trial.

3. If you do challenge, attack claim 1's actual metes and bounds. Institution is not assured: Resonac's three companion petitions were denied on discretionary grounds on 2026-02-03 under § 314(a), notwithstanding a full Sotera stipulation. A new petitioner should (a) file before being served, to avoid § 315(b), (b) address Fintiv as a co-pending-litigation risk explicitly, and (c) attack the granted limitations — the 0.5 T < H_n < H_s window, the 0.1–3 nm ferromagnetic coupling layer directly between the layers, and the 3–30 nm storage-layer thickness — because the Examiner allowed over Suess/Intermag 2005 on the coercive-field relationship, not those numeric bounds.

4. Preserve the § 112 and double-patenting angles. The '031 claim 1 uses the relative term "hard magnetic nucleation host" and the numeric floor 0.5 T < H_n while the specification's embodiment text and claim 10 use 0.7 T < H_n; and claim 1 omits the increasing-anisotropy multilayer feature that the specification's summary and the Examiner's allowance rationale treat as central. Also note the prosecution record shows the '031 claims were themselves used in an ODP rejection against a sibling's claims (Fullerton et al. cited as the difference). These are legitimate § 112 ¶ 2 / written-description and double-patenting themes for an invalidity or IPR strategy.

5. Watch for late filings. Because the patent expires 2026-09-05, any IPR/PGR naming US 11,133,031 would have to be filed imminently. Before relying on this "zero proceedings" conclusion in a brief, re-check PTAB E2E and the PTACTS petition docket for the '031 patent number, and confirm on CourtListener whether any appeal touching this family has been docketed at the Federal Circuit.

Confidence and gaps. High confidence on the core finding (no AIA trial has ever targeted the '031 patent) — it is corroborated by the USPTO ODP structured block and by the fact that every PTAB caption I retrieved pairs MR Technologies with the '864, '997 or '734 patents, never the '031. Moderate confidence on the exact 2026-02-03 denial date and the "discretionary denial, merits not reached" characterization of all three Resonac proceedings — these rest on a Director Notice of Decisions and a third-party PTAB tracker rather than the Board's per-proceeding papers, which I could not open directly. I did not retrieve the claim numbers or full grounds from any Resonac petition, and I could not verify an ex parte reexamination search to completion; I have said so rather than guessing.

I'll research the assignment chain for this patent, starting with the USPTO assignment records and the known 2022 transfer to MR Technologies.

Let me dig into the specifics of the recorded assignment and look for any additional recorded transfers (including pre-issuance inventor-to-employer transfers).

Assignment & Ownership Analysis — US 11,133,031 B2

Primary source note: The USPTO Assignment Center search interface (https://assignmentcenter.uspto.gov/) and its predecessor index (https://assignment.uspto.gov/patent/index.html) are the nominal sources for this section. I was able to confirm only one recorded assignment for this patent number, via the Google Patents legal-events record supplied in the authoritative full text (Reel/Frame 060183/0431). I could not retrieve the underlying Assignment Center abstract page or the recorded correspondent (attorney/agent) field for that reel/frame — that specific field is a gap and I flag it as such rather than guess. Where I state a fact, the reel/frame or docket is cited.

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Inventors

Unusual-pattern note (present, and material): This is an individual inventor who never assigned to his university or to an employer of record. The issued patent's "Original Assignee" field reads "Individual" — i.e., Suess personally. There is no recorded university tech-transfer assignment (e.g., to TU Wien) and no recorded assignment to Komag/Western Digital, notwithstanding the contemporaneous consulting relationship. The full right of title therefore stayed with the inventor personally from 2006 until the 2022 transfer to his own company. There is no record of inventors "departing the assignee within 12 months" in the classic fire-sale sense — there was no corporate assignee to depart from. The portfolio was inventor-held from the outset, which is itself an atypical (and assertion-favorable) ownership structure.

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Original assignee

• Entity on the issued patent: "Individual" — Dieter Suess, personally. No company, university, or institution is named as assignee on the face of US 11,133,031 B2, and the Google Patents legal-events record shows no pre-issuance assignment for application 15/985,661.
• Did it ship a product embodying the claims? No. The original assignee is a natural person (an academic physicist). He did not manufacture HDD media. His 2006 consultant role at Komag/WD is the only commercial touchpoint, and it runs the opposite direction from enforcement (he was advising the eventual defendant).
• Primary line of business: Academic research (computational micromagnetics / magnetic materials), TU Wien (2006) → University of Vienna (2018–present).
• Current status: Individual inventor is an operating, active professor. The patent is no longer held by the individual: current assignee of record is MR Technologies, GmbH (Austria), per Reel/Frame 060183/0431. MR Technologies is described in press coverage (Blocks & Files / Yahoo Finance) as owned by Dieter Suess — i.e., the inventor's own enforcement vehicle, not an unrelated acquirer.

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Assignment timeline

Recorded assignments for US 11,133,031 B2: one post-issuance assignment. No recordation of any pre-issuance assignment, security interest, name change, merger, or release for this patent number in the sources retrieved.

• 2022-06-13 (executed) / recorded 2022-06-13 — Reel 060183/0431
  • Conveyance: Assignment ("ASSIGNMENT OF ASSIGNORS INTEREST")
  • Assignor: SUESS, DIETER
  • Assignee: MR TECHNOLOGIES, GMBH (AUSTRIA)
  • Correspondent: Not retrievable from the sources I could access — flagged as a gap. (Note for the record: MRT's litigation counsel is the firm Russ August & Kabat, a well-known patent-plaintiff firm; however, litigation counsel is not the same as the assignment-recording correspondent, and I do not have the recorded correspondent field, so I make no claim that RAK filed the reel 060183/0431 recordation.)
  • Context: Transfer-to-asserter / pre-litigation transfer. The assignment's effective date (2022-06-13) is the same day MR Technologies filed its first infringement complaint asserting this patent family — MR Technologies, GmbH v. Western Digital Corp., W.D. Tex. No. 6:22-cv-00612 (filed 2022-06-13). The portfolio was consolidated under MRT (sibling members US 9,978,413; 9,928,864; 11,138,997; and later 11,908,500 and 12,020,734 are likewise MRT-owned), consistent with a single-purpose assertion vehicle being assembled just before enforcement.

No-records statement: Outside the single 2022-06-13 entry, the Assignment Center / legal-events record shows no further recorded conveyances for this patent. That is a finding: post-2022, the chain is static, and MR Technologies remains the owner of record.

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Timeline diagram

timeline
    title Ownership of US 11133031
    2006 : Filed by Dieter Suess as individual
    2021 : Patent issued to Suess
    2022 : Assigned to MR Technologies GmbH
         : First suit filed same day
         : Case refiled in California
    2025 : Family settled with Western Digital

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NPE / troll-pattern signals

1. Shell-entity transfer — PRESENT (modified). The patent moved from the individual inventor to a single-purpose Austrian holding/enforcement company, MR Technologies, GmbH, per Reel 060183/0431 (2022-06-13). The classic tells for a shell LLC are not met in their full form: the name carries no "IP / Patents / Licensing / Holdings / Ventures" suffix; the transferee is an Austrian GmbH, not a Delaware/Texas single-member LLC; and the transferee is owned by the same person who was the assignor (per press reporting, MRT is owned by Suess). So the entity is not anonymous — but it is a non-practicing vehicle. I score this present on the substance (title moved to a non-manufacturing assertion entity) while noting it is an inventor-owned vehicle, not an arm's-length shell.

2. Known asserter in the chain — NOT PRESENT (on the named lists) / weak. MR Technologies, GmbH does not match the enumerated NPE lists (Acacia, Marathon, Intellectual Ventures, IPNav, Wi-LAN, Conversant/Mosaid, Vringo, Pendrell, Innovatio, MPHJ, Lumen View, Round Rock, Document Generation, Spangenberg entities). It is, however, a repeat patent plaintiff (WD 2022 → W.D. Tex. 6:22-cv-00612 and C.D. Cal. 8:22-cv-01599; Seagate, D. Minn. 0:25-cv-01460; Toshiba, C.D. Cal. 8:25-cv-00786) and its patents are the subject of 2026 IPRs by Resonac (IPR2026-00014/-00015 against the '864 and '997 siblings). I therefore score this not present as to the named lists, with the repeat-plaintiff fact captured under a separate practical signal below. Note also that the Stanford NPE Litigation Database does index a case for patent 11133031 (C.D. Cal. 2:22-cv-06088), which is a soft indicator, but I could not confirm the "asserter category" field value.

3. Repeat correspondent across the chain — UNCLEAR / not established. There is only one recorded assignment in this chain, so intra-chain recurrence cannot exist. I could not retrieve the correspondent of record for Reel 060183/0431, so I cannot run the "same lawyer, rotating shell names" test the assignment asks for. This is the single most important missing data point for this patent — the Reel 060183/0431 correspondent field should be pulled directly from the Assignment Center. Separately, and clearly labeled as not an assignment correspondent: MRT's litigation counsel of record is Russ August & Kabat (Los Angeles), a high-volume patent-plaintiff firm. If the assignment correspondent on 060183/0431 turns out to be a RAK attorney, that would convert this signal to present and would strengthen the pattern. I am not asserting that link.

4. Cascading transfers — NOT PRESENT. There is a single hop (Suess → MR Technologies, GmbH). No chained LLCs, no serial re-recordings, and no shared-address/common-principal cascade. The 24-month chained-LLC pattern is absent.

5. Pre-litigation transfer — PRESENT (strong). The assignment to MR Technologies was effective 2022-06-13 and the first infringement suit naming the family — W.D. Tex. No. 6:22-cv-00612 — was filed 2022-06-13. That is a same-day transfer, well inside the 6-month window. The sequence was then re-organized for venue: the Texas case was voluntarily dismissed (notice dated 2022-08-26) and the same day MRT refiled in C.D. Cal. No. 8:22-cv-01599 (2022-08-26). This is a textbook "arrange the chain to enable assertion" pattern, with the additional wrinkle that MRT then dropped the '031 and '413 patents before trial, proceeding only on '864 and '997.

6. Bankruptcy fire-sale — NOT PRESENT. No bankrupt assignor (the assignor was a natural person), and no proceedings-type sale. Not applicable.

7. Privateering — NOT PRESENT. The classic privateering pattern (operating company → NPE asserting on the operating company's behalf) does not fit: the transferor is the individual inventor, not an operating company, and the beneficiary is that same inventor. There is no SEC-disclosed operating-company sponsor behind MR Technologies that I could identify. (Note the tangential fact that Suess consulted for Komag/WD in 2006 — that makes WD the accused, not the sponsor.)

8. Defensive aggregator — NOT PRESENT. The chain terminates at an enforcement entity (MR Technologies), not at RPX, AST, LOT Network, Unified Patents, or OIN. The patent is fully asserted, not neutralized.

Additional practical signal (beyond the eight): Repeat litigant / serial assertion. MR Technologies has filed against three of the largest HDD makers (WD, Seagate, Toshiba) and won a $262,388,800 jury verdict against WD on the sibling '864/'997 patents (July 26, 2024), later settled globally for $130 million (April 2025). The '031 patent itself never reached verdict — it was asserted and then dropped. This is a licensing-campaign pattern, not isolated enforcement.

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Verdict

NPE — moderate confidence.

Two things drive this: (i) the pre-litigation transfer signal is unambiguously present — title moved to MR Technologies, GmbH effective 2022-06-13 (Reel 060183/0431) on the same day the first suit was filed (W.D. Tex. 6:22-cv-00612), which is the hallmark of a chain arranged to enable assertion; and (ii) the current assignee is a non-practicing enforcement vehicle with no products in commerce, which — even though it is inventor-owned rather than an anonymous shell — is the substance of the "shell-entity transfer" category. It is moderate and not high confidence because this is not a classic troll chain: the single transferor is the named inventor himself, the transferee is a real Austrian GmbH openly owned by him, there is only one hop (no cascading LLCs), and no named NPE-list entity appears anywhere in the chain. The most important open item is the correspondent of record for Reel 060183/0431, which I could not retrieve; a repeat-player attorney there would materially raise this to high confidence.

Verify at: USPTO Patent Assignment Search — https://assignmentcenter.uspto.gov/ (search by patent number 11133031), which will surface Reel/Frame 060183/0431 and its correspondent field."

Explicit gaps / caveats (do not treat as findings):

• The correspondent/attorney of record for the 2022 assignment (Reel 060183/0431) was not retrievable from the sources I could access. This is the key missing tell.
• I could not confirm whether any pre-issuance assignment (e.g., inventor-to-institution) exists but is unrecorded; the record shows "Individual" as original assignee and no recorded pre-issuance assignment.
• Whether the '031 patent was among the patents actually asserted in W.D. Tex. 6:22-cv-00612 is carried over from the prior section as consistent but not independently re-verified in this pass; if it was not asserted there, the "first suit naming this patent" date would shift and signal 5 would need re-dating.
• No security agreement, license, or merger records for this patent were found; unrecorded licenses would be invisible here.

I'll research the prior art for US 11,133,031 against USPTO records and the cited references.

Now let me research the remaining cited references, especially the pre-2006 art that could be § 102 anticipatory.

Prior-Art Analysis — US 11,133,031 B2 ("Multilayer Exchange Spring Recording Media")

A note on method and on one important limitation of this answer. The full citation lists below are taken from the authoritative text of US 11,133,031 that was supplied to me (the Google Patents rendering of the USPTO record, which lists 15 patent citations, 18 non-patent citations, plus a separate 19-entry "Patent Citations" table). I ran targeted searches on the highest-value references. Because I hit my tool-call budget partway through, the descriptions of a handful of the lower-value references (mostly the pre-2005 Japanese/Korean assignee publications) are based on title, assignee, and date data only, and I say so where that is the case. I have not auto-corrected any number or identifier.

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Threshold issue 1 — the effective prior-art date is 2006-06-17, not 2018-05-21

'031 was filed 2018-05-21 as a continuation of US 11/424,859 (filed 2006-06-17, now US 9,978,413 B2) and therefore carries the 2006-06-17 priority date. Two consequences:

1. Only references dated before (or effectively filed before) 2006-06-17 can be § 102 art. This disqualifies several cited references from the § 102 analysis outright — see Tannous 2008 and Suess JMMM 2007 below.
2. Because every claim has a pre-2013-03-16 effective filing date and the family never presented a post-AIA-effective claim, the pre-AIA § 102/§ 103 framework applies. That matters because pre-AIA § 102(e) makes a granted US patent prior art as of its filing date, which is how two of the most relevant references (US 7,687,157 and US 7,550,210) operate.

Flagging a caveat: whether pre-AIA or AIA applies is a legal determination that depends on the full application/prosecution record, which I could not inspect. I proceed on the pre-AIA basis stated on the face of the family.

Threshold issue 2 — no cited reference discloses all of claim 1

Claim 1 is the only independent claim. Every dependent claim (2–10) incorporates all of claim 1's limitations, so no reference can anticipate any dependent claim unless it first discloses every element of claim 1. Claim 1 requires, cumulatively:

• a writing head + a disk (system claim);
• a granular hard storage layer, perpendicular anisotropy, 3–30 nm, coercive field H_s;
• a granular hard nucleation host, perpendicular anisotropy, disposed columnar, coercive field H_n with 0.5 T < H_n < H_s;
• host polarization J_s = μ₀M_s between 0.3 T and 1.0 T;
• a coupling layer 0.1–3 nm directly between the two magnetic layers;
• ferromagnetic coupling.

Against that full element set, none of the 15 cited patent documents or 18 cited NPL items is a clean § 102 anticipation. All were before the examiner and the patent issued. Their real force is § 103, and the analysis below identifies the combinations that matter most. I mark each item "§ 102: no" where it plainly cannot anticipate, and identify the specific claims it is nonetheless probative against.

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A. Cited US patent documents

(The separate 19-entry "Patent Citations" table adds only the family's own members — US 9,928,864; US 9,978,413; US 2018/0211689; US 2018/0268852 — which are likewise the applicant's own work and not prior art.)

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B. Cited non-patent literature

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C. Bottom line — the four references that actually matter

For § 102 (anticipation): none of the cited references anticipates claim 1 or, therefore, any of dependent claims 2–10. No single reference supplies all of the required elements. The strongest § 102(e) candidates — US 7,550,210 and US 7,687,157 — each fail at least one claim-1 limitation:

• US 7,687,157 fails on the express 3–30 nm storage-layer range, the 0.5 T < H_n < H_s window, the host J_s 0.3–1.0 T, and columnar disposition.
• US 7,550,210 fails because it requires substantially similar anisotropy fields, whereas claim 1 requires H_n < H_s.

For § 103 (obviousness): the realistic attack is a combination, and the examiner already ran the leading one:

1. Suess 2004 (JMMM 290–291) + Suess 2005 (APL 87, 012504) — the examiner's on-record combination for a multilayer exchange-spring stack with a lower-anisotropy nucleation layer.
2. US 7,687,157 + Hagedorn 1970 + Victora/Shen 2005 (or Inaba 2005) — the recording-media structure (granular hard layer + lower-coercivity exchange-spring layer + ~0.2–1 nm ferromagnetic coupling layer) combined with the pinning-field theory and the composite-media coercivity-reduction teaching. This combination reaches essentially every element of claim 1 except the numerically recited ranges, which would be attacked as routine optimization.

Failure modes the patentee can exploit (points of distinction to preserve):

• Claim 1 requires ferromagnetic coupling, while several of the most similar references — US 6,280,813, US 6,383,668, US 2005/0058855 (AFC), and Victora/Shen's and Wang's decoupling layers — teach the opposite magnetic relationship. That is a genuine, repeatedly recurring distinction.
• Claim 1 requires the storage layer to be granular, distinguishing the continuous overlayer of US 6,468,670.
• The 0.5 T < H_n lower bound in claim 1 is broader than the specification's embodiment language and claim 10 (which recite 0.7 T < H_n) — an internal inconsistency I flagged in the earlier summary. The broader 0.5 T bound in the independent claim is the more vulnerable of the two and any art showing H_n between 0.5 T and 0.7 T would bear directly on claim 1 but not on claim 10.

Two caveats I will not paper over:

• (i) I could not retrieve the full text of references A2, A6, A9, A10, A11 in the available tool budget; their "no § 102" entries are based on title/assignee/date data and should be re-verified against their specifications before being relied on.
• (ii) Whether pre-AIA or AIA § 102 governs (and therefore whether US 7,550,210, US 7,687,157, and US 2007/0243418 operate as § 102(e) art or AIA § 102(a)(2) art) depends on the prosecution record of this continuation, which I could not inspect. The analysis above assumes pre-AIA, consistent with the 2006-06-17 family priority date.

Obviousness Analysis — U.S. Patent No. 11,133,031 B2

Multilayer Exchange Spring Recording Media — 35 U.S.C. § 103

Analysis grounded in the prior-art sections of the authoritative patent page (https://patents.google.com/patent/[US11133031](/patent/US11133031)/en): "Citations (15)," "Non-Patent Citations (18)," "Family Cites Families (40)," and "Similar Documents," plus the specification text of the '031 patent itself.

Read in conjunction with the previously generated Patent Summary, Litigation Summary, PTAB Challenges, and Strategic Summary. Those sections established the claim structure, the family posture, and the untested state of claims 1–10. This section does not repeat them; it builds on the allowance history and claim language already captured there.

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I. Threshold issues that frame the whole § 103 analysis

A. Governing law — pre-AIA § 103

The '031 patent issued from application 15/985,661, filed 2018-05-21, but it is a continuation of application 11/424,859, filed 2006-06-17 (now US 9,978,413 B2), all sharing the same specification. If the granted claims are supported by the 2006 disclosure, their effective filing date is 2006-06-17, which is before 2013-03-16, so pre-AIA § 103 applies. This matters concretely:

• Pre-AIA § 102(e) makes a U.S. patent or published application prior art as of its filing date (not its publication date) as to subject matter "described" therein and "by another." This is what makes the Hitachi GST and Fullerton references discussed below available, despite publishing in 2007–2010.
• Pre-AIA § 103(c) and the Hilmer doctrine limit the use of certain U.S. application art for obviousness; a challenger should confirm whether any combination depends on § 102(e) art that would be excluded as commonly owned.
• The inventor's own publications (the Suess papers) are not "by others" under § 102(a), but several — notably the JMMM 2004 paper (available online 18 Dec. 2004) — qualify as § 102(b) statutory bars precisely because they predate the 2006-06-17 filing by more than one year. This is a self-inflicted wound: the specification expressly incorporates Suess by reference and the papers are listed in the file-wrapper as the references the Examiner used.

B. The priority-date question is the single largest lever

If the granted claim 1 is not fully supported by the 2006-06-17 disclosure, the effective date shifts forward to 2018-05-21, and an entire second tier of art opens up. The "Family Cites Families (40)" block alone supplies a decade of intermediate art, e.g.:

Note that several of these (Seagate '564, Hitachi '377, Do Hoa) are themselves pre-2006-06-17 and therefore available regardless of the priority question. They should not be overlooked simply because they appear in the "cited-by" rather than "citations" block.

C. Contradictions to flag explicitly (do not silently resolve)

1. H_n floor: Granted claim 1 recites 0.5 T < H_n; the specification's embodiment language ("0.7 T<H_n<H_s") and granted claim 10 recite 0.7 T < H_n. The claims as issued control, and claim 1's lower floor makes it broader than the specification's own described embodiment — a classic § 112(a)/(b) and obviousness-over-the-spec vulnerability.
2. The allowance rationale vs. the granted claim: As recorded in the Strategic Summary, the Examiner's Reasons for Allowance distinguished Suess, "Optimization of Exchange Spring Perpendicular Recording Media," Intermag Nagoya, April 2005 and allowed on the coercive-field relationship (H_n < H_s) and multiple ferromagnetic layers with increasing K. But granted claim 1 does not recite multiple layers with increasing anisotropy at all — it recites a single "granular hard magnetic nucleation host." That is a material mismatch between what was allowed and what issued, and it is the strongest invitation to a § 103 attack.
3. Date conflict in the working papers: the task header states "Current Date: April 26, 2026," while the system date is 2026-09-29 and the earlier Strategic Summary treated "today" as ~3 weeks before the 2026-09-05 adjusted expiration. Per the operating rules I do not auto-correct; I flag that the practical significance of this analysis (expiration runway, intervening rights) depends on which date is correct.

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II. Inventory of available prior art (as furnished by the page)

Tier 1 — squarely pre-dating 2006-06-17 (pre-AIA § 102(b)/(a)):

Tier 1b — § 102(e) art (filed before 2006-06-17, published later):

Tier 2 — post-2006 "Families Citing this family" / "Similar Documents" (usable only if the priority date is broken): US 7,572,526; US 7,588,368; US 7,588,841; US 8,202,636; US 8,163,405; US 9,022,985; US 9,191,097; US 8,940,418; US 8,796,764; US 8,887,275 (FePt:C); US 9,685,184; US 9,550,777; US 9,990,951. These would be devastating in an obviousness case built on the "gradient host" concept, because several expressly claim anisotropy gradients and multiple exchange-coupled hard/soft layers in perpendicular media.

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III. Claim 1 — element-by-element mapping

Claim 1 (the only independent claim) requires:

Preliminary conclusion: No single reference on this page discloses every limitation in a single embodiment — so anticipation is unlikely and the analysis properly proceeds under § 103. But the claim is a combination of individually known elements with only three numeric/property hooks (0.5 T < H_n < H_s; 3–30 nm; 0.1–3 nm) and one material hook (granular hard host). That is the profile of a claim vulnerable to a KSR "predictable combination of known elements" attack.

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IV. Specific proposed combinations and motivations to combine

Combination A — Suess 2004 + Suess APL 2005 + Hagedorn 1970 (+ Loxley 2001)

(the combination the Examiner is recorded as having used, extended to the granted claim)

What each teaches

• Suess 2004 (JMMM) — exchange-spring media for perpendicular recording with a hard layer exchange-coupled to a softer layer; tri-layer architecture. A § 102(b) bar.
• Suess APL 2005 — reversal proceeds by domain-wall formation and propagation across the interface, not by uniform rotation; strong exchange coupling between layers.
• Hagedorn 1970 — the coercive (pinning) field required to push a domain wall from the softer layer into the harder layer is governed by the difference in anisotropy constants; and the model predicts a ~5× coercive-field reduction when the soft layer has finite anisotropy.
• Loxley 2001 — corroborating domain-wall-pinning model showing ~4× coercivity reduction at a hard/soft interface.

Motivation to combine. All four are in the same field (thin magnetic films / perpendicular recording), address the same problem (writing a magnetically hard medium with a limited head field), and Hagedorn is the quantitative design rule that a skilled artisan at Suess's disclosure would naturally apply to select the host anisotropy and layer count. The '031 specification itself concedes this linkage: "The field, required to overcome the pinning field to push a domain wall from the softer layer to the hard layer depends on the difference between the anistropy constants of these layers as described by a formula by Hagedorn et al. If the number of layers is increased, this difference can be decreased leading to a reduction of the pinning and coercive field." And it recites Hagedorn's factor-of-five result. An applicant's own admission that a cited reference supplies the operative design formula is about as strong a motivation-to-combine showing as exists.

Where the granted claim adds something. Claim 1 requires the host to be hard (H_n > 0.5 T), not merely a low-anisotropy soft layer. Hagedorn's finite-anisotropy case and Suess's Intermag 2005 optimization (host Hc > 0.5 T) supply exactly that. The 0.5 T floor is also the specification's own definitional boundary between "hard" and "soft."

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Combination B — Suess Intermag 2005 (gradient host) + Hagedorn + Loxley + US 7,846,564 (Seagate anisotropy-gradient media)

Why this is the most threatening combination. The file-wrapper record (per the Strategic Summary) indicates the Examiner already found in Suess Intermag 2005 a hard magnetic storage layer (Hc > 0.5 T) exchange-coupled to a gradient-anisotropy nucleation host. Add:

• US 7,846,564 (Seagate; filed 2005-09-27, before the priority date) — perpendicular media with a magnetic anisotropy/coercivity gradient and local exchange coupling. That is essentially claim 1's architecture minus the numeric labels.
• US 7,550,210 (Hitachi GST; filed 2006-03-09) — multiple exchange-coupled magnetic layers having substantially similar anisotropy fields — supplies the "hard host whose coercivity is below the storage layer's but still > 0.5 T."
• Hagedorn — supplies the reason to tune the anisotropy step and the layer count.

Motivation. The references are directed to the identical problem (writeability of high-anisotropy perpendicular media) and would be combined by any artisan seeking to trade coercivity against thermal stability. Seagate '564 and Hitachi '210 are § 102(e) art because their filings precede 2006-06-17. Because the resulting structure is the predictable product of known elements (a gradient or stepped anisotropy profile across a coupled magnetic stack), KSR compels the conclusion of obviousness absent evidence of unexpected results.

Caveat on § 103(c): if any of these references are commonly owned with the '031 patent's claimed invention as of the invention date, they may be disqualified under pre-AIA § 103(c). The page does not indicate common ownership (Seagate/Hitachi vs. the individual inventor Suess), so this is not an apparent obstacle — but it should be verified.

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Combination C — US 6,468,670 (IBM composite perpendicular layer) + US 6,383,668 (IBM AFC "host" layer) + US 2007/0243418 (Fullerton, laminated exchange-coupled ferromagnetic layers) + Hagedorn

What each teaches

• IBM '670 — a composite perpendicular recording layer (hard + soft sub-layers) on a non-magnetic substrate.
• IBM '668 — an AFC recording layer with a "host layer" — the very nomenclature the '031 claim uses ("nucleation host").
• Fullerton 2007/0243418 (filed 2006-04-12, § 102(e)) — a perpendicular medium whose recording layer is "formed of exchange-coupled ferromagnetic layers" with a thin interposed layer. This maps almost directly onto claim 1's "coupling layer directly between the nucleation host and the storage layer … the coupling … is ferromagnetic."
• Hagedorn — supplies the design rule for the coercivity split (0.5 T < H_n < H_s).

Motivation. IBM's two patents teach the substrate + hard/soft composite perpendicular stack and the "host layer" concept; Fullerton teaches the thin ferromagnetic coupling layer between exchange-coupled hard layers; Hagedorn teaches that the anisotropy difference between the hard and softer layers controls the switching field. Combining them to make the softer partner still hard (> 0.5 T) is a result-effective-variable optimization of the type approved in In re Aller and In re Woodruff, particularly since the direction of the improvement (raise the host anisotropy → raise write field but improve thermal stability; lower it → lower write field but risk stability) was known and the specification's own text treats the choice as a smooth trade-off.

Counter-consideration: Victora & Shen and Wang both taught reducing coupling with a decoupling layer. That is the patent owner's best "teaching away" thread (see § VI).

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Combination D — US 7,687,157 (Hitachi GST exchange-spring structure) + US 7,550,210 (Hitachi GST multiple exchange-coupled layers) + US 7,425,377 (Hitachi GST exchange-coupled ferromagnetic laminate) + Suess 2004

What each teaches

• '157 — exchange-spring structure in a perpendicular medium.
• '210 — multiple exchange-coupled magnetic layers with substantially similar anisotropy fields (i.e., the layers are all comparatively hard — directly supporting "granular hard … nucleation host" with H_n close to but below H_s).
• '377 — a laminate of exchange- ferromagnetic layers that reverses incoherently (domain-wall-like) — supporting the "ferromagnetic coupling / domain-wall-across-interface" mechanism.
• Suess 2004 — the writeability rationale.

Motivation. "Substantially similar anisotropy fields" in '210 places the artisan squarely in the 0.5 T < H_n < H_s window once a harder top layer is chosen; '377 supplies the ferromagnetic-layer laminate architecture; '157 supplies the exchange-spring frame. All are in the same field and address the same trade-off.

§ 102(e) note: '157 and '210 are available because their filing dates (2005-02-04 and 2006-03-09) precede 2006-06-17. The published applications corresponding to them may also be citable under pre-AIA § 102(e).

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Combination E — The "system" claim construction

Claim 1 is a system claim: writing head + disk. Nothing in the prior art fails to disclose a head plus a medium. Adding the conventional write head to any of the media of Combinations A–D is the routine incorporation of a known element to perform its known function (KSR, Sakraida v. AG Pro), and the 0.5 T < H_n < H_s window is itself explained by the patent's own description as chosen to give the host "a coercive field similar to typical fields of recording heads."

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V. Dependent claims 2–10

Because the dependent claims are all conventional materials, dimensional ranges, or property/result metrics, they are unlikely to survive if claim 1 falls.

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VI. Anticipated patent-owner rebuttals, and how they fare

1. "Victora & Shen / Wang taught decoupling, so the art taught away from ferromagnetic coupling."
   Assessment: This is the strongest non-obviousness argument, but it is materially weakened by three facts on this record. (a) Victora/Shen and Wang concerned uniform-magnetization composite media; Suess APL 2005 and Dobin & Richter taught the opposite regime (inhomogeneous/domain-wall-assisted reversal with strong coupling) in the same period, so the art as a whole did not uniformly teach away. (b) US 2007/0243418 (Fullerton) expressly claims a perpendicular recording layer "formed of exchange-coupled ferromagnetic layers" with a thin interposed layer — direct support for claim 1's ferromagnetic coupling layer. (c) Under In re Fulton / In re Gurley, a preference is not a teaching away unless the art criticizes, discredits, or discourages the claimed route; the specification says nothing of the kind.

2. "Unexpected results — coercivity reduced by factors of 9–13 with unchanged thermal stability."
   Assessment: Potentially probative if a nexus to the claimed scope can be shown and the result is not attributable to the known Hagedorn relation. But the specification's own analysis undercuts it: it derives H_c = 1/(4N−4) × 2K_hard/J_s and states the trend is predicted by Hagedorn's formula. A result that the cited reference's formula predicts is, by definition, expected. Also, the degree of improvement here is attenuated because the claim requires the host to be hard (H_n > 0.5 T), which recovers much of the coercivity that a fully soft host would remove.

3. "The energy barrier is decoupled from the coercive field — a newly discovered principle."
   Assessment: A newly appreciated operational principle of a structurally known article does not confer patentability where the structure itself would have been obvious (In re Cruciferous Sprout). More important, the granted claim does not recite the ratio r = ΔE_thermal/ΔE_hyst at all. That limitation appears only in the specification's "some embodiments" prose (r in the range 0.5 to 10). It cannot supply patentability to claim 1 as issued.

4. "The Examiner allowed over Suess Intermag 2005 on the coercive-field relationship and multiple increasing-K layers."
   Assessment: This is the most dangerous admission in the record. The granted claim 1 does not recite the multiple increasing-K layers at all. So the rationale does not attach to the words of the claim, and a challenger is free to re-argue the weight the Examiner gave the H_n < H_s relationship — which Hagedorn supplies as a design rule.

5. "The 0.5 T floor is a criticality."
   Assessment: The specification frames 0.5 T not as a discovered critical value but as a definitional boundary between "hard" and "soft." Criticality arguments require evidence that the claimed range produces results markedly different from the unclaimed range (In re Woodruff), which this record does not supply.

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VII. Secondary considerations — what exists and what does not

• Commercial success / industry praise: The family was commercialized and enforced — the $262.4M Western Digital verdict (July 2024) and $130M global settlement (April 2025) support a prima facie story of success and copying interest. However, the nexus problem is severe: the verdict rested on the sibling '864 and '997 patents, and the '031 patent was dropped before trial. Any secondary-considerations argument must therefore establish nexus to the '031 claim's specific features (the discrete 0.1–3 nm ferromagnetic coupling layer; the 3–30 nm storage layer; the 0.5 T < H_n < H_s window), which no litigation outcome establishes.
• Industry recognition of the exchanged-spring architecture: the Intermag/APL/JMMM publications and the 34 "Families Citing this family" references show the architecture was widely adopted — but widespread adoption of an obvious architecture is not a rebuttal; it is neutral.
• Copying / failure of others: the Resonac petitions (IPR2026-00014/15/16, denied on discretion 2026-02-03) reflect competitive interest but not validity findings.
• No PTAB adjudication: as established in the PTAB Challenges section, no claim of the '031 patent has ever been canceled, confirmed, or construed. There is no administrative validity finding to point to.

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VIII. Top three combinations, ranked by strength

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IX. Bottom line

Claim 1 is, on the furnished record, more likely than not invalid under § 103 as a predictable combination of known exchange-spring, domain-wall-pinning, and laminated-perpendicular-media elements. The convergence point is the applicant's own specification, which:

• introduces Hagedorn 1970 as the design rule controlling the pinning field,
• cites Loxley 2001 for the factor-of-four coercivity reduction, and
• states that Suess's exchange-spring work (Suess 2004/APL 2005) describes the domain-wall mechanism.

When the patent's own specification supplies the motivation, the formula, and the expected magnitude of improvement, the KSR "predictable result" analysis is difficult to resist.

Claims 2–10 add no independent inventive weight — they are a materials list (Fe/O, FePt-L10, CoPt/CoPtCr/CoPtCrB/CoPtCrTa/CoCr) and dimensional/definitional ranges (2–10 nm grains; >7 nm host; A > 10⁻¹⁴ J/m; 0.7 T < H_n; squareness within 10%; L10 ordering), all of which appear in the cited art or in the specification's own working examples.

The hooks a challenger must actually neutralize are three and only three:

1. 0.5 T < H_n < H_s — a window bracketed by Hagedorn's finite-anisotropy teaching on the low side and the hard storage layer on the high side, and by the specification's own "hard" definition at 0.5 T.
2. A discrete 0.1–3 nm ferromagnetic coupling layer directly between the layers — met by US 2007/0243418 (laminated exchange-coupled ferromagnetic layers) and US 7,384/699 (tuned exchange coupling).
3. Granular host disposed in a columnar manner, 3–30 nm storage layer — routine granular perpendicular media morphology.

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X. Confidence, gaps, and what would change the analysis

High confidence: the applicability of pre-AIA § 103; the availability of the Tier-1 references; the element-by-element mapping of claim 1 to the cited art; the specification's own admission of the Hagedorn design rule; the internal inconsistency between claim 1's 0.5 T floor and claim 10's/specification's 0.7 T floor; the mismatch between the allowance rationale (multiple increasing-K layers) and granted claim 1 (single host layer).

Moderate confidence: the exact content of the Reasons for Allowance and the precise scope of what Suess Intermag 2005 discloses regarding Hc > 0.5 T — I am relying on the characterizations carried forward in the earlier Strategic Summary and the file-wrapper description embedded in the page, not on the underlying Office Action text, which I could not open directly.

Gaps I cannot close from the furnished materials:

1. The actual claim-1 priority determination. Whether claim 1 enjoys the 2006-06-17 date decides whether the entire Tier-2 art (Seagate '564, US 9,022,985, US 8,940,418, US 9,990,951, etc.) is in play. This is the highest-value open question.
2. The exact filing dates and 102(e) status of US 7,687,157, US 7,550,210, and US 2007/0243418 as against the invention date (not just the filing date) — critical under pre-AIA § 102(e).
3. Common ownership under § 103(c) for the Hitachi GST and Seagate references.
4. The Dobin & Richter preprint's May 15, 2006 posting date — only 33 days before the priority date; whether it is § 102(a) art turns on the inventor's actual reduction-to-practice/derivation evidence.
5. Whether any of the Tier-2 family-cited references were before the Examiner. The page's "Citations (15)" block does not include them; if they were not considered, that itself is a § 282/§ 301 and IDS exposure for the patent owner.

What would flip the analysis toward non-obviousness: (i) a holding that the granted claims are entitled to 2006-06-17 and that Suess Intermag 2005 does not disclose a hard host — narrowing the closest art; (ii) credible, nexused evidence of unexpected results tied to the 0.1–3 nm ferromagnetic coupling layer specifically; or (iii) a demonstrated teaching-away in Victora/Shen and Wang that a domain-wall architecture with strong ferromagnetic coupling would not work — an argument the '031 specification itself was written to rebut, and which is thus likely to fail.

Caveat on the date discrepancy: the task states the current date as April 26, 2026, the system date is September 29, 2026, and the earlier Strategic Summary treated ~August 2026 as "today." I flag rather than resolve this; it does not change the § 103 analysis above, but it does change the practical value of any invalidity challenge given the 2026-09-05 adjusted expiration and the resulting intervening-rights and Fintiv-type considerations.