US 5280991

I'll search for authoritative records on this patent number, then synthesize.

Search notes / confidence

• I searched for the literal number 5280991 (and the formatted variants 5,280,991). Results consistently resolved to a single patent — US 5,280,991 A, "Headliner" — with no similar-number hits surfacing (e.g., no confusion with 5,280,990 or 5,281,991-class neighbors).
• CAFC 2026 docket search: no results returned. My queries for 5280991 in connection with litigation/CAFC returned empty result sets. I cannot verify the completeness of that negative, so treat "no litigation found" as unconfirmed, not as an affirmative finding of no litigation. Note also that the patent lapsed in 2006 (see below), which makes 2026 appellate activity implausible except for very old accrued-damages disputes.
• Date discrepancy to flag: your instruction says "Current Date: April 26, 2026," while my session date is 2026-09-30. I used the literal search window you specified (calendar year 2026) and note the mismatch rather than reconciling it.

I have the authoritative full text of the patent in hand (Google Patents mirror of the USPTO record), so the summary below is grounded in that document; where I rely on secondary aggregators I say so.

Bibliographic data

Term note: this is a pre-URAA application (filed before June 8, 1995), so the nominal term was 17 years from issue (i.e., to ~2011-01-25). Google's "anticipated expiration 2012-02-19" figure (20 years from priority) is moot because the patent actually lapsed in 2006 for non-payment. For any 2026 dispute the patent is long dead; only pre-2006 accrued rights could conceivably matter, and even then subject to the §286 six-year damages lookback.

Abstract (verbatim)

"A vehicle headliner includes a preformed headliner substrate which can be of molded construction and which includes an upper surface facing the roof of a vehicle. Attached at a plurality of locations on the upper surface of the headliner are magnets bonded to the upper surface of the headliner and positioned for engaging contact with aligned metallic vehicle roof structure once installed. In one preferred embodiment, the magnets are flexible extruded magnetic strips positioned to at least partially surround a relatively large aperture formed in the headliner such as one defining a sunroof opening. In a preferred embodiment of the invention also, the magnetic strips are attached to the headliner using a cushioning material such as a foam to provide acoustical damping for the headliner."

Plain-language claim analysis

Important drafting nuance: although the patent lists six claims, only claims 1 and 2 are independent. Claim 3 opens "The headliner for a roof of a vehicle as claimed in claim 2, in which…" — it is dependent on claim 2 despite otherwise reading like a standalone claim. Claims 4, 5, 6 each add "flexible magnetic strip" and depend on claims 1, 2, 3 respectively.

Claim 1 — sunroof-aperture version (independent). A headliner for a vehicle roof that has a big sunroof hole. The headliner substrate itself has a matching hole. Along the edge of that hole sit several elongated, rectangular magnets, oriented so a long side runs parallel to the hole's peripheral edge. Each magnet is mounted on an acoustically damping foam cushion of the same shape; adhesive bonds magnet-to-cushion and cushion-to-substrate. The magnets hold the headliner "securely but movably" against the roof around the opening — the point being the headliner can be nudged into final alignment during assembly rather than locking in place. The cushions also hold the headliner a controlled distance off the roof, creating open air gaps; the claim asserts this isolates the headliner acoustically so separate damping material can be omitted.

Claim 2 — broad peripheral-edge version (independent). Same architecture, but no sunroof aperture required. The substrate is shaped to conform to the vehicle roof so its peripheral edge follows the roof's peripheral edge, and a first series of the rectangular magnet-plus-cushion assemblies is spaced along that substrate perimeter. Same "securely but movably support" and same gap/acoustic-isolation language. This is the broadest claim in the patent, since it covers any magnetic edge-mounting of a headliner.

Claim 3 — combined edge + aperture version (dependent on claim 2). Takes claim 2 and adds the sunroof scenario: the substrate has an aperture matching the roof aperture, plus a second series of rectangular magnet/cushion assemblies along the edge of that inner aperture. Result: one set of magnets at the outer perimeter, another around the sunroof opening. Same gap/acoustic-isolation language.

Claims 4–6. Each simply requires that the magnetic members be flexible magnetic strips, tied respectively to claims 1, 2, and 3.

Key structural limitations to note for any validity/infringement reading: (a) magnetic members must be rectangular with a long side adjacent the edge; (b) a discrete cushion member matching each magnet's shape; (c) two distinct adhesive bonds (magnet→cushion, cushion→substrate); (d) movable (non-locking) support; and (e) the functional consequence of roof-spacing air gaps permitting elimination of added acoustic material — functional language of the kind that invites §112 scrutiny.

Technical disclosure highlights (context for the claims)

• Headliner is a three-dimensional molded resin-impregnated fibrous bat substrate with a decorative fabric lower surface; construction is stated to be of the type in U.S. Pat. No. 4,828,910 ("Sound Absorbing Laminate," issued 1989-05-09), incorporated by reference.
• Magnet assemblies: closed-cell PVC or cellular urethane foam pad (density ~7–50 lb/ft³; preferred 20 lb/ft³; thickness ~0.080–0.4 in) bonded to the substrate with hot-melt adhesive (Findley Adhesive #1745; final glue layer ~0.010–0.015 in), with the magnet attached via pressure-sensitive acrylic adhesive (3M468, ~0.005 in roller-coated).
• Magnet: extruded flexible iron-ferrite-in-nylon material (~80% ferrite by volume), multiple-pole magnetized, thickness ~0.030–0.120 in, width ¼ in to 1½ in (typical ~1 in); commercially from Dynacast Magnetics / Flexmag Industries, Cincinnati, Ohio.
• FIG. 4 alternative: a bipolar magnet with steel pole pieces on either side, each pole piece ~1/3 the magnet's thickness, concentrating flux into the sheet-metal roof.
• Stated motivation: screw/snap/adhesive/hook-and-loop fasteners lock the headliner down and prevent lateral shifting, which is hard to manage on an assembly line — especially around large sunroof openings with little surrounding roof structure.

Prior art of record

• 31 cited references, including US 2,639,751 (Flaherty, vehicle cover), US 2,957,832 (Baermann, flexible permanent magnets), US 3,102,314 (Alderfer), US 3,257,586, US 3,895,288 and US 3,679,505 (3M polymer-based magnets / magnetic insect screen), US 3,953,067 (Isola, vehicle headliner construction), US 4,112,303, US 4,172,918 (Van Dresser, automotive liner panel), US 4,226,368, US 4,338,974 (Webasto), DE 3100270 (J.H. Benecke), US 4,516,804 (Toyota), US 4,741,945, US 4,779,390 (Audi), US 4,840,832 (Collins & Aikman), US 4,923,245 (Ikeda Bussan), US 4,987,671 (BMW), US 5,148,580.
• 1 non-patent citation: Koroseal Flexible Magnetic Strip, Bulletin No. 24, B.F. Goodrich Industrial Products Co., Apr. 9, 1961 — the primary art on flexible magnetic strip generally.
• The touchstone for novelty here is therefore not "magnetic fastening" or "flexible magnetic strip" (both old), but their application to a molded headliner substrate with foam-cushioned strips permitting lateral repositioning during assembly.

Forward citations (post-issuance interest): 79 citing documents per the record, including US 5,681,024 (Donnelly, modular panel assembly), US 5,754,664 and US 5,823,611/5,833,304 (Prince), US 5,795,015 (Ford, headliner assembly and locating method), US 6,070,902 (Lear, vehicle interior headliner system), US 6,322,136 (Deere), US 7,641,273 (Toyota, vehicle headliners), Termax magnetic fastener clip family (US 8,615,852 / US 9,499,108 / US 10,429,000), US 8,876,200 / US 9,428,226 (Ford, magnetic attachment for non-magnetic body structure), and US 9,955,926 (Ford, magnet fastener assembly).

Litigation / CAFC docket — explicit uncertainty

I could not locate any litigation, ITC proceeding, or Federal Circuit appeal involving US 5,280,991 in my 2026 docket searches. Because the docket queries returned no results rather than a clear "no records" statement from an authoritative docket, I am not representing that the patent was never litigated. Given the 2006 lapse and the §286 six-year damages lookback, any 2026 CAFC activity tied to this patent would be highly anomalous. If you need a definitive litigation history, the reliable route is a targeted PACER/Docket Navigator/LEXIS search on "5,280,991" and on the Prince Corporation / Johnson Controls Technology Company party strings, plus the patent's USPTO assignment and reexamination file histories.

One further file-history caveat worth logging: the patent is a continuation of Ser. No. 07/838,599 filed 1992-02-19, "now abandoned," filed here on 1993-02-26 — more than 12 months after the parent's filing date. That gap is not automatically fatal (the 12-month rule is a §119 foreign-priority deadline; §120 domestic benefit requires only copendency, with no 12-month limit), but the "now abandoned" recital suggests the parent may have already gone abandoned before the continuation was filed, which would undercut copendency. The benefit claim appears to have been accepted and the printed claims may reflect the 1994-08-16 certificate of correction, which I cannot inspect from the text available. I flag this as an open item rather than a conclusion.

I'll search for litigation involving US patent 5280991 across patent litigation databases.

Let me search litigation-specific databases.

Let me check additional litigation-specific sources.

Litigation Search Results: US Patent No. 5,280,991

Bottom line: I found no evidence of any litigation involving US Patent No. 5,280,991.

What I searched

I queried for the specific number across patent‑litigation‑oriented sources reachable via web search (including results referencing RPX Insight litigation documents, PTAB/PTActs dockets, Justia federal docket PDFs, Unified Patents' litigation materials, and general litigation coverage). None of the hits returned a case in which US 5,280,991 is asserted, challenged, or otherwise at issue.

Key caveats and false positives I ruled out

1. "'991 patent" in Vectura v. GlaxoSmithKline-type cases — Several litigation documents refer to "the '991 Patent" (e.g., Vectura's inhaled-therapy patents asserted against Glaxo's Breo®/Anoro®/Incruse® products). Those are different patents (pharmaceutical, different number entirely). Per your instruction not to conflate similar numbers, I excluded them.

2. "5280991" as an unrelated ID — Numerous non‑patent hits matched the string purely as a record/account/registration number (payroll ledgers, Brazilian registration lists, a CourtListener financial‑disclosure investment ID). None are patent litigation.

3. Google Patents family data — The Google Patents page for US 5,280,991 shows only the patent itself, its parent application (Ser. No. 07/838,599, filed Feb. 19, 1992, now abandoned), and citations/cited‑by references. It lists no litigation, no ITC investigation, no IPR/PGR, and no "Litigation" section, which is consistent with there being no known suits.

Patent context (for the record)

• Patent: US 5,280,991 A, "Headliner"
• Inventor: Walter M. Weiland
• Original assignee: Prince Corporation (Holland, MI); current listed assignee: Johnson Controls Technology Co.
• Filing date: Feb. 26, 1993 (continuation of Ser. No. 07/838,599, filed Feb. 19, 1992)
• Issue date: Jan. 25, 1994
• Status: Expired – Fee Related; lapsed for failure to pay maintenance fees, effective Jan. 25, 2006 (maintenance‑fee reminder Aug. 10, 2005; lapse Jan. 25, 2006; patent discontinued Feb. 22, 2006).

Note the practical significance: because this patent lapsed in 2006 for non‑payment of maintenance fees, it could not have been asserted in any suit filed after that date. Whether it was ever asserted during its 1994–2006 enforceable life, I cannot confirm from the sources retrieved, and I found no such record.

Conclusion

On the available evidence, no known litigation involves US Patent No. 5,280,991. If you need a definitive negative, the authoritative confirmation would come from a paid docket database (e.g., Docket Alarm / LexMachina / PACER full‑text search) or the Unified Patents litigation portal's per‑patent page; those were not directly reachable/full‑text searchable in this session, so my conclusion is based on the absence of any matching record in the results I could retrieve rather than a certified docket‑wide negative.

I'll verify the structured data with targeted searches before finalizing.

The first hits concern unrelated patents (e.g., US 9,264,991 asserted by Ozmo Licensing). Let me confirm nothing attaches to the headliner patent specifically.

Proceedings overview

Total AIA trial proceedings on file for US 5,280,991: 0. Breakdown: 0 active, 0 with claims invalidated, 0 with claims sustained, 0 settled, 0 institution denials. The structured "PTAB proceedings on file" block (USPTO Open Data Portal) returns no AIA trial activity, and my web search surfaced no IPR, PGR, or CBM proceeding, no reexamination, and no Federal Circuit appeal naming this patent. The bottom-line defensive posture is therefore not "the patent has survived two IPRs and is hardened" — it is the opposite: the patent was never tested at the PTAB, and, more importantly, it is dead on the maintenance-fee ledger. Per the Legal Events record at Google Patents, the patent lapsed under 37 C.F.R. § 1.362 for nonpayment of maintenance fees, effective 2006-01-25 ("PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES"). A defendant facing a demand letter citing this patent should lead with expiration, not with invalidity.

Proceedings detail

There are no proceedings to array most-impactful-first. Instead, here is the affirmative record a defendant needs.

No AIA proceeding — Petitioner v. Patent Owner (none)

• Type: N/A — no Inter Partes Review, Post-Grant Review, or Covered Business Method review on file.
• Filed: N/A.
• Status: No PTAB activity on file (canonical, from the USPTO Open Data Portal structured block). This defaults to a true negative, not an incomplete record.
• Judge panel: None. No panel has ever touched this patent.
• Petition grounds: None. Because no petition was filed, there are no § 102 / § 103 / § 112 grounds of record and — critically — no § 315(e)(2) estoppel attaches to anyone.
• Institution decision: None.
• Final Written Decision: None. Claims 1–6 have never been construed or adjudicated by the Board. Do not let anyone tell you a claim of this patent was "canceled in IPR" — that would be a fabrication.
• Settlement / termination: None.
• Appeal: None. No CAFC docket or CourtListener opinion could be located for this patent.
• Defensive value: The absence of PTAB activity is explained by the patent's age and death, not by its strength. No defendant has needed to file an IPR because there is nothing left to invalidate — the patent lapsed in 2006.

Prosecution and lifecycle record (context for the zero-proceeding finding)

• Filing / priority: Application 08/023,923, filed 1993-02-26, as a continuation of Ser. No. 07/838,599, filed 1992-02-19 (now abandoned). Priority date 1992-02-19. Granted 1994-01-25 as US 5,280,991 A. A Certificate of Correction issued 1994-08-16.
• Inventor / assignee: Walter M. Weiland; original assignee Prince Corp USA (current listed assignee Johnson Controls Technology Co.).
• Claim set: 6 claims. Claim 1 (sunroof-aperture headliner, elongated rectangular magnetic members + acoustically damping foam cushion members), claim 2 (independent; peripheral-edge magnetic series), claim 3 (depends on 2; adds sunroof second series), claims 4–6 (dependents reciting "flexible magnetic strip").
• Maintenance fees: 4-year fee paid 1997-05-19; 8-year fee paid 2001-07-02. Maintenance fee reminder mailed 2005-08-10; lapse for failure to pay 2006-01-25; patent discontinuation recorded 2006-02-22. Google Patents lists the "Anticipated expiration" as 2012-02-19 (20 years from the 1992-02-19 priority date), but that date is theoretical — the enforceable term ended with the 2006 lapse. (I flag the internal inconsistency: the on-record lapse is 2006-01-25 while the statutory 20-year date is 2012-02-19. Treat the legal status "Expired – Fee Related" as controlling.)
• Prior art of record: 31 U.S./foreign references cited by the examiner, including US 3,953,067 (Isola, "Vehicle headliner construction"), US 4,110,303 (Yench), US 4,176,918 (Van Dresser), US 4,518,586/US 4,510,986 (magnetically attached window covers), US 4,841,832 (Collins & Aikman, "Molded automobile headliner"), US 4,923,245 (Ikeda Bussan, ceiling structure), and US 4,828,910 (Haussling, "Sound absorbing laminate"), which the specification expressly incorporates by reference (issuet 1989-05-09). One non-patent citation: Koroseal Flexible Magnetic Strip Bulletin No. 24, B.F. Goodrich Industrial Products Co., 1961-04-09.
• Defensive value: This prior-art set is your invalidity toolkit if you truly need one. The magnetic-attachment concept itself is old art (Baermann US 2,959,832; Alderfer US 3,102,314; 3M US 3,897,288 and US 3,679,505), and the headliner-per-se concept is old art (Isola; Van Dresser). Any § 102/§ 103 theory you build would be a district-court theory, not a PTAB one — but see the expiration point first.

Strategic summary

Claim status: all six claims are expired, none are canceled, none are PTAB-sustained. Because no AIA trial was ever instituted, there is no Inter Partes Review Certificate and no claim-cancellation record. Claims 1–6 stand as issued (modulo the 1994 certificate of correction) but are unenforceable for lack of maintenance-fee payment after the 2006 lapse. For a defendant, the practical status map is: UNTESTED = claims 1–6 (no PTAB adjudication), and EXPIRED = claims 1–6 (fee lapse effective 2006-01-25). There is no "surviving claim" to design around — there is a dead patent.

Estoppel landscape: there is no estoppel, and that cuts both ways. § 315(e)(2) estoppel requires a final written decision, and none exists, so no party is barred from raising any ground. Conversely, a defendant gains nothing from IPR-based estoppel either — there is no earlier petitioner and no privity chain to exploit or fear. If a demand letter nonetheless arrives, your defenses are statutory rather than estoppel-based: (1) the patent is expired, so any accused conduct occurring after 2006-01-25 cannot infringe; (2) damages are limited to a six-year lookback under 35 U.S.C. § 286 and further constrained by § 287 marking and the absence of any willfulness predicate on a dead patent; (3) invalidity under §§ 102/103 on the rich 1960s–1980s magnetic-fastener and headliner art of record; and (4) § 112 written-description/enablement attacks on the acoustic-damping functional language in claims 1–3, which no tribunal has ever construed.

Pattern signals — and a critical identifier trap. There is no repeat petitioner, because there are no petitioners. There is no defensive aggregator (Unified Patents or similar) in the chain; Unified Patents appears in search results asserting an unrelated patent also informally called "the '991 patent" — see the trap below. There is no PTAB appeal history, so no signal of aggressive patent-owner PTAB litigation posture. The two real signals are (a) maintenance-fee abandonment in 2006 — a patent owner that stops paying is telling you what the portfolio was worth; and (b) the complete absence of litigation-driven PTAB activity, consistent with a commercially moribund 1992 headliner patent. Identifier trap: numerous search hits for "the '991 patent" refer to US 9,264,991, a wireless-networking patent asserted by Ozmo Licensing LLC against HP, Acer, and Dell in W.D. Tex. (and challenged in an IPR by Unified Patents, petition dated 2022-12-06). That is a different patent with a superficially similar number. Likewise, US 7,124,205 and US 9,055,104 appear in PTAB documents under a "'991" shorthand in unrelated contexts. If someone hands you a PTAB docket "for the '991 patent," verify the seven-digit number digit-for-digit before relying on it.

Recommended next steps

1. Do not file an IPR — there is nothing to file it against. US 5,280,991 lapsed on 2006-01-25 for failure to pay maintenance fees (Legal Events: REMI 2005-08-10; LAPS 2006-01-25; STCH 2006-02-22; FP 2006-03-21, effective 20060125). An IPR on an expired patent is a waste of six figures and will not produce an FWD that helps you. The correct first move is a one-page letter citing the fee lapse and § 286.
2. Confirm the patent number in any demand letter against the USPTO record. If the letter says "US 5,280,991," respond on expiration. If it says "US 9,264,991" (Ozmo Licensing), you are in a completely different matter — see the Unified Patents IPR2022 petition dated 2022-12-06, which references the Ozmo v. HP/Acer/Dell W.D. Tex. cases (HP voluntarily dismissed 2021-11-24). Do not blend the two files.
3. Preserve the invalidity record anyway. The full file history, the 31 cited references, and the incorporated US 4,828,910 are on the face of the Google Patents record. If a plaintiff argues the patent is somehow revived or the fee lapse is a data artifact, you will want the § 102/§ 103 art (Baermann US 2,959,832; Alderfer US 3,102,314; 3M US 3,897,288; Isola US 3,953,067; Van Dresser US 4,176,918) teed up.
4. Verify status independently before relying on this memo. I confirmed the zero-PTAB finding from the structured ODP block plus targeted web searches, but I could not locate any PTAB E2E or PTACTS case page for this patent to link, precisely because none exists. If you need a belt-and-suspenders check, run the patent number through PTAB E2E and the CourtListener docket search yourself; my searches returned no proceeding, no reexamination, and no CAFC appeal for US 5,280,991.

Bottom line for a defendant: no PTAB history exists because the patent was never worth challenging — it expired for nonpayment of maintenance fees in 2006. Your defense is the expiration date, not a PTAB final written decision. There is no FWD to quote, and any statement that claims of US 5,280,991 were invalidated at the Board would be false.

I'll start by searching the USPTO assignment records and related sources for US 5,280,991.

Inventors

• Only one inventor is named on the patent and on the parent application (Ser. No. 07/838,599, filed 1992‑02‑19, abandoned; continuation Ser. No. 08/023,923 filed 1993‑02‑26, which issued as US 5,280,991 on 1994‑01‑25).
• Unusual-pattern check: I found no evidence of inventor departures from Prince within 12 months of filing, and no evidence of inventor-to-inventor assignments or inventor-held residual rights. Radaris-style inventor aggregators list Weiland only in connection with Prince Corporation (Holland, MI) and this patent, which is weak but consistent evidence of a routine employee-inventor assignment. A single named inventor on a corporate automotive-interiors case is not itself anomalous. Not present.

Original assignee

Prince Corporation (Holland, Michigan) — listed by Google Patents as "Original Assignee: Prince Corp USA."

• Business: automotive interior systems and electronics supplier to OEMs — overhead consoles, compass/electronics modules, visors, and headliners. The patent's own specification is built around a production headliner with a sunroof opening, visor apertures, console aperture and grab-handle slots (col. describing elements 16, 18, 20/22, 24–28), i.e., a part Prince actually made and shipped to automakers. Prince was later credited with HomeLink and AutoLink overhead/electronics products.
• Current status: Acquired. Prince became "Prince, a wholly owned subsidiary of Johnson Controls" — JCI press material dated 1997‑02‑27 and 1998‑01‑05 describes Prince as a JCI company, and the transaction is generally reported as 1996 (~$1.35 B). Google Patents' current assignee for US 5,280,991 is "Johnson Controls Technology Co", a Johnson Controls subsidiary — i.e., the patent's ownership is treated as having passed to the JCI side, not to an NPE.
• ⚠ Contradiction flagged: one retrieved source (ru.wikipedia, "Принс, Эдгар") states Johnson Controls bought Prince in 1993, whereas JCI's own 1997–98 releases and general reporting place the acquisition in 1996. I could not resolve this from primary corporate filings in this session. The 1993 date is likely erroneous, but treat the exact acquisition year as unverified.
• Downstream corporate fate (lower confidence): Prince's operations were folded into JCI's Automotive Experience business; JCI's automotive interiors and electronics lines were subsequently reshaped (interiors JV with Yanfeng; the automotive electronics business including HomeLink reported as sold to Visteon, ~2014). I could not verify these later steps against SEC filings in this session, so they are context only, not a finding for this chain.

Assignment timeline

Plainly stated: I could not retrieve any recorded assignment document (reel/frame) for US 5,280,991 in this session.

• The Google Patents legal-events table for US 5,280,991 contains no AS – Assignment rows at all. The complete set of events is:
  • 1994‑08‑16 — CC Certificate of correction
  • 1997‑05‑19 — FPAY Fee payment, year 4
  • 1998‑12‑08 — FEPP Fee payment procedure: "PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY"
  • 2001‑07‑02 — FPAY Fee payment, year 8
  • 2005‑08‑10 — REMI Maintenance fee reminder mailed
  • 2006‑01‑25 — LAPS Lapse for failure to pay maintenance fees
  • 2006‑02‑22 — STCH Patent discontinued
  • 2006‑03‑21 — FP Lapsed due to failure to pay maintenance fee (effective 2006‑01‑25)
• Because no assignment rows surfaced, I will not list speculative reel/frame entries. The USPTO Patent Assignment Search was not reachable as a queryable full-text source in this session, so I cannot certify a docket-wide negative.

What the record implies (inference, clearly labelled):

• The only ownership change that must have occurred is Prince Corporation → Johnson Controls family. The patent was prosecuted and issued in Prince's name (filing 1993‑02‑26; issuance 1994‑01‑25), and Prince was a JCI subsidiary by the late 1990s. Whether that transfer was recorded with USPTO as an assignment, as a merger, or handled as a change of name / successor-in-interest, and under what reel/frame, is not determinable from the sources I retrieved.
• The lone adjacent datapoint is the 1998‑12‑08 FEPP payor-number/LARGE ENTITY entry. That is a maintenance-fee-procedure event, not a recorded conveyance; it is consistent with an ownership/entity-status update in the late 1990s but is not proof of an assignment, and I do not treat it as one.
• The patent lapsed 2006‑01‑25 for non-payment of maintenance fees, which is a hard outer bound on any later transfer activity: ownership after that date is economically moot.

If the Assignment Center genuinely holds no records for this patent, the practical reading is that no post-issuance conveyance was ever recorded, and the chain terminates with the original assignee (with JCI's "current assignee" listing derived from corporate-successor/related-record data rather than a recorded assignment on this patent number). That distinction is itself the finding.

Timeline diagram

timeline
    title Ownership of US 5280991
    1992 : Parent application filed by Prince
    1993 : Continuation filed 08/023923
    1994 : Patent issued to Prince Corporation
         : Certificate of correction
    1996 : Prince acquired by Johnson Controls
    1997 : First maintenance fee paid
    2001 : Second maintenance fee paid
    2006 : Patent lapsed for nonpayment

NPE / troll-pattern signals

1. Shell-entity transfer — not present. No evidence of a move to a licensing-only LLC. The only ownership attribution beyond the original assignee is Johnson Controls Technology Co, a subsidiary of a then-public NYSE-listed operating company (Johnson Controls, Inc.). No "IP/Holdings/Ventures" assignee, no registered-agent address, no single-purpose entity appears anywhere in the record I could retrieve.
2. Known asserter in the chain — not present. No assignee matches Acacia, Marathon, Intellectual Ventures, IPNav, Wi‑LAN, Mosaid/Conversant, Vringo, Pendrell, Innovatio, MPHJ, Round Rock, or any Unified Patents / RPX high-frequency plaintiff directory entry. (Cross-check per the earlier litigation section: no suit, ITC action, IPR or PGR involving this patent was found.)
3. Repeat correspondent across the chain — unclear / not assessable. I could not retrieve any recording correspondent because no assignment reel/frame entries surfaced. The patent's front-page prosecution correspondent is not present in the fetched grant data either. I therefore cannot cite a correspondent name, firm or reel/frame, and I explicitly decline to infer one. Recurrence of a single filing attorney cannot be evaluated without the underlying reel/frame set.
4. Cascading transfers — not present. No chain of consecutive assignments through chained entities; nothing within any 24-month window to point at.
5. Pre-litigation transfer — not present. No infringement suit naming US 5,280,991 was found (see prior litigation section), so there is no trigger event against which a 6-month pre-suit transfer could be measured.
6. Bankruptcy fire-sale — not present. Prince/JCI did not go through Chapter 7/11 over this patent. The patent's terminal event is a maintenance-fee lapse (2006‑01‑25 LAPS; 2006‑02‑22 STCH), i.e., cost-driven abandonment, not a distress sale.
7. Privateering — not present. No evidence of an operating-company-to-NPE transfer with back-assertion, and no SEC-filing press coverage of such an arrangement for this patent.
8. Defensive aggregator — not present. The chain does not terminate at RPX, AST, LOT Network, Unified Patents or OIN; no defensive-aggregation acquisition appears.

Verdict

Insufficient data — no recorded assignment reel/frame could be retrieved for US 5,280,991 and the Google Patents legal-events table lists zero AS assignment events, so only the original on-face assignment to Prince Corporation is credibly established; under the stated rule, a chain with no retrievable assignment records does not support an NPE call in either direction. What is documented points away from NPE activity: the only non-original ownership attribution is Johnson Controls Technology Co, an operating-company subsidiary of a public automotive supplier, and the patent's terminal events are the 1997‑05‑19 and 2001‑07‑02 FPAY payments followed by the 2006‑01‑25 LAPS / 2006‑02‑22 STCH lapse, not a transfer. Adding the prior section's negative litigation finding, there is no assertion history to hang an NPE verdict on.

Verify independently at:

• https://assignment.uspto.gov/patent/index.html (search patent number 5280991)
• https://assignmentcenter.uspto.gov/
• https://patents.google.com/patent/US5280991/en (Legal Events + "Current Assignee" fields)

Caveats: (a) I could not query the Assignment Center full-text index in this session, so "no records" is unverified rather than certified; a definitive check requires the Assignment Center directly or a paid docket database. (b) The Prince→Johnson Controls acquisition year is contested between sources (1993 vs. 1996). (c) No reel/frame number is stated anywhere above because none could be retrieved — none should be inferred from this report.

I'll verify the patent record and probe the key cited references before building the prior-art table.

Let me probe the remaining high-relevance references.

Prior‑Art Analysis — US Patent No. 5,280,991 ("Headliner")

1. Target patent confirmed (USPTO record)

Legal framework applied: This application was filed in 1993, so pre‑AIA 35 U.S.C. § 102 governs (AIA § 102 applies only to applications filed on or after Mar. 16, 2013). Because the '991 patent claims benefit of the Feb. 19, 1992 parent, the § 102(b) critical date is Feb. 19, 1991 (one year before the U.S. filing date).

Elemental breakdown used below (from the literal claim language):

• A — substrate covering the interior of a vehicle roof
• B — aperture substantially identical to the roof's sunroof aperture (claims 1, 3) / peripheral edge conforming to the roof peripheral edge (claim 2)
• C — plurality of elongated, rectangular magnetic members, longer sides running along the peripheral edge, one longer side adjacent that edge
• D — acoustically damping cushion member for each magnet, having the shape of each magnetic member
• E — means for attaching magnets to cushion, and cushions to substrate
• F — magnets + cushions "securely but movably" support the substrate on the roof
• G — cushions space the headliner from the roof to create open areas, isolating the headliner and "allowing the elimination of additional acoustical damping material"

2. Threshold finding, stated up front

No citation of record anticipates any of claims 1–6 as a whole. Anticipation under § 102 requires every limitation in a single reference. No reference located in this record discloses the combination of (i) a vehicle headliner substrate, (ii) rectangular elongated magnetic members arrayed along a roof/sunroof aperture edge or the substrate periphery, and (iii) a per‑magnet acoustically damping cushion, with the cushion's spacing function of limitation G.

The 31 cited references fall into three functional buckets, each supplying only part of the claim:

• Bucket 1 – Headliner/roof‑liner structures (supply A, B, F): US 3,953,067; US 4,172,918; US 4,840,832; US 4,741,945; US 4,778,390; US 4,828,910; US 4,923,245; US 4,516,804; US 4,113,303; US 4,639,035; US 4,220,368; US 4,337,974; DE 3,100,270; DE 3,527,541; JP S62‑191273; US 4,987,671.
• Bucket 2 – Flexible magnets & magnetic fastening (supply C's "flexible magnetic strip," E): US 2,959,832; US 3,257,586; US 3,897,288; US 3,102,314; US 2,797,370.
• Bucket 3 – Magnetically attached panel/closure covers (supply C + E in a non‑headliner context): US 2,639,751; US 3,675,505; US 3,805,872; US 4,510,986; US 5,148,580; US 3,365,684; US 4,788,964.

None of these buckets contains limitation D as claimed (a cushion per magnet, shaped to the magnet, performing an acoustical function) — and none contains G. That is where the novelty of the '991 claims resides, and it is the limitation most likely to defeat a § 102 challenge to claims 1–3. Buckets 2 and 3 are, in practice, § 103 combination art, not anticipatory art.

3. Tier 1 — Most relevant prior art (closest to anticipation)

US 3,953,067 A — "Vehicle headliner construction"
Isola, Richard A. — priority Sept. 18, 1974; published Apr. 27, 1976.
Description: Self‑supporting, one‑piece folded/curved headliner of rigid foldable material, intended to avoid cut‑and‑sewn and molded‑headliner drawbacks; uses seam‑appearing fold lines, edge‑folding, and channel/"rigid member" supporting means engageable with roof bows and lateral roof rails. Explicitly discusses installation after windshield/backlite assembly and multiple headliner sections.
§ 102 assessment: Closest single reference on A and F (a substrate for covering the vehicle roof interior, secured to the underside of the roof). It does not disclose magnets at all, nor a per‑magnet cushion. Anticipates no claim. Best use: § 102(b) art for the "substrate + roof mounting structure" preamble and for § 103 combination with Bucket 2.

DE 3,100,270 A1 — "Motor vehicle inside panelling" (Kraftfahrzeug‑Innenverkleidung)
J. H. Benecke GmbH, Hannover — priority Jan. 8, 1981; published Aug. 5, 1982.
Description: Interior panelling for a motor vehicle interior. Assignee is a well‑known automotive trim/panel supplier.
§ 102 assessment: Flagged as unverified. I could not retrieve this reference's full text in this session, and I will not characterize its disclosure. By title it is a § 102(b) reference to interior panelling, relevant at most to A and possibly to attachment means E. A full‑text pull (Espacenet/DPMA) is required before it can be relied upon for any claim. I do not assert it anticipates anything.

US 4,516,804 A — "Vehicle body ceiling seal construction"
Toyota Jidosha Kabushiki Kaisha — priority Oct. 5, 1982; published May 14, 1985. (Full text retrieved.)
Description: Outer/inner roof panels, weather strip at the outer roof panel end, and a ceiling trim device with curved flanges plus clips that clasp the edge of the inner roof panel and resiliently hold the ceiling up against the roof panels. The stated object is to conceal the gap between the weather strip and the inner roof panel and to eliminate visible screws/troughs. The ceiling itself is described as corrugated cardboard with a vinyl inner layer.
§ 102 assessment: Good art on A, F and on the general problem of a neat trim edge at a roof/liner junction (the '991 background section discusses precisely this trim‑appearance problem). Mechanical clips, not magnets; no cushion, no acoustical spacing function. Anticipates no claim; strong § 102(b) background art supporting a § 103 argument on claim 2's "securely support the substrate against the peripheral edge of the roof."

US 4,923,245 A — "Ceiling structure of motor vehicle"
Ikeda Bussan Co., Ltd. — priority Jul. 31, 1987; published May 8, 1990. (§ 102(b).)
Description: Vehicle ceiling/headliner structure per title; I did not retrieve full text.
§ 102 assessment: Headliner‑mounting art on A, B, F. No evidence of magnets or of a per‑magnet damping cushion. Anticipates no claim pending full‑text confirmation.

US 4,828,910 A — "Sound absorbing laminate"
Reinhold Haussling — priority Dec. 16, 1987; published May 9, 1989. (§ 102(b).)
Description (retrieved): Moldable laminate with a resilient porous fibrous batt core between porous reinforcing fibrous mats, bonded by a thermoset (urethane elastomer) binder, with a decorative porous fabric cover; thermoformable into three‑dimensional contoured articles such as automobile headliners; provides sound absorption and defines compressed marginal edges.
Special status: This is the reference expressly incorporated by reference into the '991 specification ("This headliner construction can be of the type disclosed in U.S. Pat. No. 4,828,910 … the disclosure of which is incorporated herein by reference"). It is therefore applicant‑admitted headliner construction art.
§ 102 assessment: Discloses the substrate/acoustical laminate aspect (A) and the general aim of a self‑damping headliner. It has no magnets and no magnet‑carried cushion, so it cannot anticipate claims 1–3, and cannot by itself anticipate claim 2's magnetic series. Its significance is that the porous‑batt/fibrous‑mat construction was already applicant's own admitted starting material — narrowing the '991 novelty to the magnetic mounting + cushioning arrangement.

US 3,679,505 A — "Magnetic insect screen"
Minnesota Mining & Mfg — priority Feb. 9, 1971; published Jul. 25, 1972. (§ 102(b).)
Description: Screen removably held by a magnet arrangement to a frame/apron around an opening (per title and the assignee's polymer‑magnet program).
§ 102 assessment: Structurally the closest analogue to claim 1's "magnetic strips positioned to at least partially surround a relatively large aperture," but in a non‑analogous, non‑vehicular context and with no headliner substrate and no acoustical cushion. Anticipates no claim; useful § 102(b)/§ 103 art for the concept of magnetically framing an aperture.

4. Tier 2 — Element‑level references (flexible magnets; magnetic fastening)

These are the references cited for what became limitation C/E in the '991 claims, and for the subject matter of dependent claims 4, 5, 6 ("each of said magnetic members comprises a flexible magnetic strip").

5. Tier 3 — Magnetically attached covers/closures (non‑headliner context)

Cited to show magnetic attachment of large flexible panels; none is a headliner and none has an acoustical cushion.

6. Tier 4 — Roof/liner/sunroof background art

Cited as evidence of the state of headliner and roof‑opening art; none shows magnetic mounting plus cushioning.

7. Claim‑by‑claim bottom line

8. Highest‑risk combination theory (obiter, for completeness)

Although § 102 fails on this record, the art assembles into a coherent § 103 attack:

US 3,953,067 or US 4,516,804 (self‑supporting vehicle headliner/ceiling held to the roof by mounting structures) + US 2,959,832 / US 3,257,586 / US 3,897,288 / Koroseal Bulletin (extruded flexible polymer‑bound ferrite strip) + US 3,679,505 (magnetic strip arrayed around an opening) + US 4,828,910 (applicant's own incorporated‑by‑reference porous‑batt acoustical headliner laminate).

The remaining obstacle for the challenger is limitation D/G — the purpose‑shaped cushion per magnet that both acoustically damps and spaces the headliner off the roof so the open air gaps do the isolation. The '991 specification supports this as the inventor's stated advance ("isolates the headliner from the underlying support structure and therefore provides additional acoustical damping allowing the elimination of additional acoustical damping material sometimes required"). Any validity dispute over the '991 patent would likely turn on that limitation.

9. Limitations of this analysis — stated explicitly

1. Full texts retrieved in this session: US 5,280,991 (complete), US 3,953,067, US 4,516,804, US 4,828,910. For DE 3,100,270 A1, JP S62‑191273, JP S64‑72075, DE 3,527,541 A1, US 4,113,303, US 4,172,918, US 4,777,390, US 4,840,832, US 4,923,245, US 4,987,671, US 4,741,945, US 2,959,832, US 3,257,586, US 3,897,288, US 3,102,314, US 2,797,370, US 2,639,751, US 3,805,872, US 4,510,986, US 4,616,456, US 5,148,580, US 3,365,684, US 4,788,964 I am working from the title/assignee/date data in the '991 citation table plus my prior knowledge. Where the title alone cannot support a disclosure finding, I have labelled the entry unverified rather than inferring content. A definitive § 102 call requires full‑text review of each, especially DE 3,100,270 (interior panelling — the most likely place a magnetic panel attachment could hide) and JP S62‑191273 (vehicle body panel damping).
2. Dates. The first date in each table is the "priority date" as recorded in the Google Patents citation table for US 5,280,991; the second is the publication date. Actual filing dates may differ (they matter only for § 102(e), which is largely moot here because every reference except US 5,148,580 published more than one year before the Feb. 19, 1991 critical date).
3. Patents cited "by examiner" vs. "by third party": All 31 references and the Koroseal bulletin are marked as cited by the examiner; the "Cited By" list (52 entries on the front page, 79 in the expanded table) is third‑party/forward citation material and is not prior art to the '991 patent.
4. Meta‑date inconsistency to flag: the system prompt for this session gives today's date as Sept. 30, 2026, while the task prompt states April 26, 2026. This affects nothing in the prior‑art analysis (the patent lapsed in 2006), but it is an inconsistency in the inputs.
5. Consistency with the earlier "Litigation summary" section: the litigation findings (no known suits; lapse Jan. 25, 2006) are consistent with the record above. Nothing in this prior‑art analysis contradicts that section.

I'll verify a few of the load-bearing references in the prior-art section before building the § 103 combinations.

Two of those (Lorber US3805872 and 3M US3679505) are much closer art than the earlier section assumed. Let me pull the remaining magnetic-cover references.

Obviousness Analysis Under 35 U.S.C. § 103 — US 5,280,991 ("Headliner")

Governing law: pre‑AIA § 103(a), because the application was filed Feb. 26, 1993 (AIA § 103 applies only to applications filed on or after Mar. 16, 2013). The § 102(b) critical date is Feb. 19, 1991. The controlling framework is Graham v. John Deere Co., 383 U.S. 1 (1966), as glossed by KSR Int'l Co. v. Teleflex Inc., 550 U.S. 398 (2007) — no rigid teaching‑suggestion‑motivation requirement; the test is whether the claimed subject matter as a whole would have been obvious to a person of ordinary skill, and the rationales of MPEP § 2143 (A)–(G) supply the analytical vocabulary.

Framing caveat (carried forward, not repeated): the patent lapsed for non‑payment of maintenance fees effective 2006‑01‑25, and no litigation, ITC action, PTAB proceeding, or CAFC appeal is of record. This § 103 analysis is therefore a retrospective/defensive exercise — useful for a covenant‑not‑to‑sue review, an invalidity contention in a stale‑damages dispute, or a nullity study — not a live validity contest. The task prompt's date (April 26, 2026) and the session date (Sept. 30, 2026) still disagree; nothing below turns on it.

I built on the Prior‑Art section rather than repeating its reference table. Where new full‑text evidence upgrades an earlier assessment, I flag it explicitly.

1. Level of ordinary skill in the art (the key § 103 input)

A POSITA as of Feb. 19, 1991 was a mechanical or automotive‑interiors engineer (BSME or equivalent) with 2–4 years of experience designing headliners, trim panels, and their attachment hardware for OEM vehicles, working alongside the supplier's materials people. That person's working knowledge, established by the art of record:

New evidence found this session (not in the '991 record — flagged for verification):

• US 4,473,980 — an insulation structure whose claim 6 recites a foam layer interposed between the adhesive layer and the flexible magnetic/ferromagnetic strip, the adhesive securing the strip to the frame. If its issue date is 1984‑09‑25 (the numbering suggests Sept. 1984, unverified), it is § 102(b) art that teaches the essence of the "cushion member … means for attaching said magnetic members to said cushion member and means for attaching said cushion members to said substrate" architecture.
• US 4,592,180 — a magnet retainer in which the magnet body is mounted with a resilient/bellows connection expressly "to provide compensation for … irregularities which may be encountered … in the surface of the ferromagnetic surface." This supplies the motivation for interposing a compliant layer between a magnet and the rigid panel it is mounted on.

Upgrade to the Prior‑Art section's assessment of US 3,805,872 (Lorber). The earlier section labelled Lorber "element‑level only; no claim." Full text retrieved this session shows it is materially closer and should be re‑tiered: Lorber discloses a large rectangular panel with eight elongated elongated magnet strips arranged around the edges of the panel, on one side thereof; hot‑melt adhesive layers bonding the strips to the panel; flexible strip material permitting the panel to "flex and conform to the contour of the vehicle"; tight surface‑to‑surface contact between the magnet band and the metal body of the vehicle; and foam‑plastic inserts slightly thicker than the magnet strips. Those are, respectively: the elongated magnetic members, limitation E, the flexible‑strip limitation of claims 4–6, the magnetic hold‑to‑vehicle‑metal, and the spacing function of limitation G. This is not anticipation of the '991 claims (no headliner substrate, no per‑magnet cushion), but it is forceful § 103 art and, in my view, the closest single reference on the attachment concept in the whole record.

2. The motivation backbone — the patent's own admission

The most powerful § 103 lever here is the applicant's own background section, which is an admission of the problem and of the adequacy of the known fastener classes ("Some headliners are attached using screw or snap‑in fasteners while others have employed adhesives. Hook and loop type fasteners such as VELCRO have also been recently employed"). The specification then states the difficulty verbatim: those fasteners "lock[] into position," the headliner "no longer can be shifted laterally," and precise initial alignment "is difficult to achieve in an assemblyline environment." It further concedes that near a sunroof opening "little supporting roof structure immediately adjacent the opening" exists, and that this area "has posed a continuous problem in terms of providing a neat trim appearance."

Under In re Nomiya, 509 F.2d 566 (CCPA 1975) and the applicant‑admission line, a patentee's characterization of the problem and of the prior art is usable as evidence of the state of the art and of what a POSITA set out to solve. Combined with the KSR rationales, this yields four independent motivations that run through every claim combination below:

1. Substitution to obtain a known property (MPEP 2143(B)): swapping a non‑repositionable fastener (screw, snap, adhesive, hook‑and‑loop) for a magnet holds the part while permitting the lateral shifting the patent says was needed.
2. Application of a known technique to a known device ready for improvement (MPEP 2143(D)): magnetic panel‑to‑vehicle‑metal retention (3M, Lorber) applied to the known headliner substrate (Isola, Toyota, Ikeda, Haussling).
3. Market/assembly‑line pressure (MPEP 2143(F)): the stated need to install through the windshield opening and align on a moving assembly line without precise fixturing.
4. Elimination of visible/unsightly hardware — Toyota's US 4,516,804 pursues the identical goal (no screws, no troughs, no trapped dirt) by mechanical means; magnets achieve it by a different known means.

3. Claim‑by‑claim combinations

Claim 2 (independent; broadest, and the most vulnerable)

Combination 2‑A: US 3,953,067 (Isola) or US 4,516,804 (Toyota) or US 4,923,245 (Ikeda) in view of US 3,805,872 (Lorber), further in view of Koroseal Bulletin No. 24 / US 2,959,832. Optionally add US 4,172,918 (Van Dresser) or US 4,840,832 (Collins & Aikman) for the molded substrate.

• Isola provides the substrate covering the roof interior plus a supporting structure engaging the roof underside; Toyota provides the ceiling lifted and resiliently held against the roof panels by edge clips; Ikeda provides a ceiling board with a plastic base and decorative layer.
• Lorber provides a first series of elongated magnetic members spaced about the periphery, adhesive‑bonded on one side, held directly to vehicle body metal, with the conformability needed for the claim's "peripheral edge … conforms to the peripheral edge of said roof."
• Rationale: simple substitution of one known attachment element for another with the predictable advantage of repositionability and no visible fasteners. KSR, 550 U.S. at 416. Gap: claim 2 does not require an aperture, so the sunroof‑specific difficulties in the spec are not a limitation; the claim reads on essentially any magnetically edge‑mounted headliner. Assessment: likely obvious — high confidence.

Claim 1 (independent; sunroof‑aperture version)

Combination 1‑A (strongest primary reference): US 4,923,245 (Ikeda Bussan) in view of US 3,805,872 (Lorber) and US 3,679,505 (3M), optionally with US 4,473,980.

Ikeda is nearly a claim‑chart match for the environment: a ceiling board (substrate) with a decorative layer, having a rectangular opening facing the sunroof opening in the roof panel, its edge portion running along that opening and detachably fixed at the opening edge. The claim‑1 limitations map as: A → ceiling board; B → opening matching the roof aperture; C → substitute Lorber's elongated rectangular flexible magnet strips for Ikeda's hook members/retainer along the opening edge; E → Lorber's hot‑melt and PSA layers; F → magnetic attraction to the roof panel.

Combination 1‑B: any of the above in view of US 3,679,505 (3M), which teaches a pair of thin flat flexible magnet strips, 0.06 in thick, 0.25 in wide, multi‑pole magnetized, with a 0.005 in PSA layer on one broad face, placed around the entire periphery of a vehicle window opening, capable of being bent to a radius under 2 in and adjustable by peeling.

Note how precisely the '991 specification's stated parameters track that art: multiple‑pole magnetized strip, thickness "from about 0.030 to 0.120 inches," width "1/4 inch to 1 1/2 inches." A POSITA choosing those values was doing nothing more than using the known commercial article described by 3M/Goodrich and scaling it to the load — routine optimization of a known parameter (In re Aller, 220 F.2d 454 (CCPA 1955); MPEP 2143(G)).

The cushion limitation (D) — the claim's real novelty, now substantially eroded. The specification's own numerical window (closed‑cell PVC or urethane, 7–50 lb/ft³, preferred 20; 0.080–0.4 in thick; 3M468 acrylic PSA "roller coated to the surface of foam section 40") is the profile of a foam‑core pressure‑sensitive mounting tape, a staple of automotive trim. Against that background:

• US 4,473,980 (flagged above, unverified date) teaches a foam layer between the adhesive layer and the magnet strip — i.e., exactly the magnet‑on‑cushion‑on‑substrate stack, with the cushion doing tolerance accommodation.
• US 4,592,180 teaches the reason to do it — resilience compensating for surface irregularity of the ferromagnetic mating surface. A vehicle roof is a stamped, curved, ribbed surface with sealer and adhesive residue; a rigid magnet strip will not seat on it without a compliant interlayer. That is a KSR‑style "design incentive" motivation of the most concrete kind.
• US 3,805,872 (Lorber) teaches foam elements "slightly thicker than the magnet strips," a spacing/clearance function — the ancestor of limitation G.
• US 4,828,910 (Haussling), expressly incorporated by reference into the '991 specification, establishes that molded acoustical headliner laminates with porous/resilient cores were applicant‑admitted prior art, which supplies the "acoustically damping" property as a known attribute of a foam interlayer.

Assessment on claim 1: obviousness is defensible but closer than claim 2. The challenger must assemble four references and must explain why a POSITA would shape the foam per magnet rather than use a continuous bead or a single tape strip. The counter is MPEP 2143(A)/(G): segmenting a compliant mounting into discrete pads each sized to its strip is a predictable, cost‑driven design choice (materials minimization, localized compliance on a doubly curved shell), producing no result beyond the sum of the parts. Confidence: moderate‑to‑high that claim 1 would fall on this combination, materially higher than the Prior‑Art section's "not anticipated" framing implies — note that "not anticipated" and "not obvious" are different questions, and the § 103 case is the strong one.

Claim 3 (dependent on claim 2; adds a second magnetic series at the aperture)

Combination 3‑A: Combination 2‑A plus Combination 1‑A/1‑B, i.e., US 4,923,245 + US 3,805,872 + US 3,679,505 (+ Ferro‑Magnetics' US 4,473,980) furnishing both the peripheral series and the aperture series.

The additional limitation relative to the claim‑2 series is a second, spaced series of the same elements along the aperture edge, doing the same job by the same mechanism. This is the classic duplication‑of‑parts situation: repeating a known element more times, with no new or unexpected result, is an obvious expedient. Ikeda specifically shows the aperture‑edge mounting in a sunroof ceiling — the second series is not even a conceptual addition, only a change of location within the same assembly. Assessment: obvious — high confidence.

Claims 4, 5, 6 (each reciting "flexible magnetic strip")

Combination 4/5/6: any of the above, plus US 2,959,832 (Baermann), US 3,257,586 (Magnetfabrik Bonn), US 3,897,288 (3M), US 3,102,314 (Alderfer), and the Koroseal Bulletin No. 24 (1961).

Flexible polymer‑bonded ferrite strip was a catalog article of commerce by the early 1960s — that is the entire point of the Koroseal bulletin and the reason the examiner cited it. A POSITA had to use flexible strip if the magnet was to follow the doubly curved roof line; the '991 specification itself describes the headliner as "a three‑dimensional curvilinear shape." Assessment: obvious — high confidence; if the independent claims fall, these fall with them.

4. Bottom‑line table

5. Rebuttals a patent owner would raise, and why they are weak here

1. "The cushion is the invention." Partially true, and it is the one limitation the of‑record art does not squarely show. But the newly surfaced US 4,473,980 claim 6 (foam layer between adhesive and magnet) and US 4,592,180 (resilience to compensate for irregular ferromagnetic surfaces), read with the applicant's own disclosed materials (foam + 3M468 tape), reduce the cushion to a predictable interlayer for a recognized problem.
2. "Non‑analogous art." This fails. Under In re Bigio, 381 F.3d 1320 (Fed. Cir. 2004) and In re Clay, 966 F.2d 656 (Fed. Cir. 1992), art qualifies by field of endeavor or by reasonable pertinence to the problem. Lorber and 3M are both concerned with holding a panel against the metal body of a vehicle around an opening — the same problem the '991 background describes. Lorber names automotive vehicles explicitly.
3. "The art taught away." No reference disparages magnets. Toyota's selection of clips is a preference among known options, which is not a teaching away. In re Fulton, 391 F.3d 1195, 1201 (Fed. Cir. 2004). More damaging for the patentee: Toyota's stated purpose — eliminating visible screws and their troughs — is the same purpose the '991 patent attributes to magnets, which makes the substitution goal‑directed rather than inventive.
4. "Long‑felt need / the problem persisted for years." This is the patentee's best line, and the gap between the 1960s–70s magnetic‑strip art and the 1992 headliner application is not trivial. But a gap is not evidence of nonobviousness: objective indicia require a nexus to the claimed invention, and there is no evidence of record of commercial success, copying, praise, or licensing tied to claims 1–3. The specification's own materials list (Dynacast/Flexmag strip, Findley 1745, 3M468, commercial foam) reads like a shopping list of off‑the‑shelf components — the opposite of an unexpected‑results narrative. There is also no test data in the patent supporting the acoustic‑isolation assertion, which was already flagged as § 112 exposure.
5. "The claims are narrow and structurally specific." Only to a degree. The "means for attaching" language is governed by § 112 ¶ 6 (pre‑AIA), which the specification limits to hot‑melt and acrylic adhesives — a narrowing that helps the patentee avoid the prior art but simultaneously invites the argument that equivalents are limited to adhesive bonding, which the art teaches abundantly.

6. Verification status and residual uncertainty (stated explicitly)

• Full text retrieved this session: US 3,953,067, US 4,516,804, US 4,923,245, US 3,679,505, US 3,805,872 (substantial excerpt incl. claims), US 4,828,910 (per the Prior‑Art section).
• Retrieved in part / date unverified: US 4,473,980 and US 4,592,180. These were not among the 31 references of record for US 5,280,991; they surfaced in this session and should be date‑verified (a post‑Feb.‑1991 date would remove US 4,473,980 from the § 102(b) window, though not from a § 102(a) or obviousness‑of‑error argument). The US 4,473,980 claim‑6 quotation is from the printed claim text, so the disclosure point is reliable even if the date is not.
• Not retrieved / characterised from citation data only: DE 3,100,270 A1 (J.H. Benecke) and JP S62‑191273 (Nissan, "damping structure of vehicle body panel") remain unverified. JP S62‑191273 is the more consequential of the two: if it discloses foam spacing between a vehicle body panel and a support for acoustic purposes, it independently supplies limitation G's rationale and further strengthens the claim‑1 and claim‑3 attacks. Recommended next step: obtain both full texts before finalising any invalidity contention.
• Not available for § 103: the forward citations (Termax magnetic fastener clip family, Ford US 8,876,200 / US 9,428,226 / US 9,955,926, Toyota US 7,641,273). These post‑date the priority date by more than a decade and are not prior art. They may be cited only as context showing the industry later settled on magnetic headliner retention; using them as § 103 art would be legal error.
• Consistency with earlier sections: this analysis does not contradict the prior Litigation, PTAB, Assignment, or Prior‑Art sections. It supplements the Prior‑Art section in two respects: (i) upgrading US 3,8055872 (Lorber) from "element‑level only" to closest § 103 reference on the attachment concept, and (ii) adding US 4,473,980 and US 4,592,180, which close most of the gap the Prior‑Art section identified around limitation D.

Net conclusion: on the record as it stands, claims 2, 3, 4, 5 and 6 would more likely than not be held obvious, and claim 1 is a close call that becomes an obviousness finding if US 4,473,980 is confirmed as pre‑1991 art and JP S62‑191273 discloses foam spacing. The patent's apparent survival of prosecution is explained not by the strength of the claims but by the examiner's of‑record citation set, which never assembled the magnetic‑panel‑to‑vehicle‑metal art around the headliner substrate — a classic KSR‑era combination that the 1993 examiner had no doctrinal mandate to make.