US 11671569

I'll search for litigation/docket information on this specific patent number, then summarize.

Let me run a couple more targeted searches to confirm whether this specific patent appears in any docket or PTAB proceeding.

US Patent 11,671,569 — Summary

Caveat on scope of search: I searched for this specific number against patent databases and litigation/PTAB dockets. I found no CAFC 2026 docket, district court case, or PTAB (IPR/PGR) proceeding naming U.S. Patent No. 11,671,569. The Coretronic-related litigation that surfaces in search results is a different matter involving different patent numbers (see next section). I could not access a live USPTO Patent Center / PACER query directly, so I cannot state with certainty that no proceeding exists — only that none appeared in my searches.

Bibliographic data (from the patent text, https://patents.google.com/patent/[US11671569](/patent/US11671569)/en)

Abstract (verbatim): "The invention provides a projection device including a first display, a second display, a third display, a light-combining module, a first angle selector, a second angle selector, a third angle selector, and a projection lens. The first display, the second display, and the third display are respectively adapted to provide a first image beam, a second image beam, and a third image beam. The projection lens is configured on one side of a light-outgoing surface of the light-combining module, and is adapted to project the first image beam, the second image beam, and the third image beam out of the projection device. The first image beam, the second image beam, and the third image beam respectively pass through the first angle selector, the second angle selector, and the third angle selector, and are then transmitted to the projection lens by the light-combining module."

Technology in plain language

The patent targets three-panel (e.g., micro-LED) projector light engines that combine red, green, and blue image beams through an X-cube prism. The stated problem is that micro-LEDs emit over a wide cone, and rays entering the X-cube at large angles undergo total internal reflection inside the prism, producing stray light and poor contrast. The disclosed fix is to place an "angle selector" (an optical film / band-pass filter stacked from high- and low-index layers) between each display and the corresponding X-cube input face. Each selector transmits its own color band at incidence angles below 30° and reflects light at 30° or more, blocking the large-angle rays before they enter the combiner. Embodiments also add anti-reflection layers on the cube's three entrance faces and its exit face. The spec reports the stray light inside the effective projected image was reduced by 66% with a third (blue) angle selector installed (FIG. 2).

Independent claims — plain-language overview

There are six independent claims (1, 11, 12, 13, 14, 15); all 15 claims are apparatus claims. Claims 11–15 largely re-recite the same combination as claim 1 with one distinguishing feature added, which is an unusual drafting pattern worth noting if validity/scope is analyzed.

• Claim 1 — The base combination: three displays producing three image beams; an X-cube style light-combining module with three light-incident surfaces and one light-outgoing surface; three angle selectors, each between a respective display and the combiner; and a projection lens at the outgoing surface. Beams pass through their selectors and are combined to the lens. Added limitation: the first angle selector is a red-light wavelength filter that passes the first image beam at <30° incidence and reflects it at ≥30°.

• Claim 11 — Same base combination as claim 1, but the added limitation is on the second angle selector: a green-light wavelength filter passing the second beam at <30° and reflecting at ≥30°.

• Claim 12 — Same base combination as claim 1, but the added limitation is on the third angle selector: a blue-light wavelength filter passing the third beam at <30° and reflecting at ≥30°.

• Claim 13 — Same base combination as claim 1, plus first, second, and third anti-reflection layers respectively on the first, second, and third light-incident surfaces of the combiner.

• Claim 14 — Same base combination as claim 1, but the three angle selectors are disposed directly on the first, second, and third light-incident surfaces (the FIG. 3 arrangement, described as reducing overall volume).

• Claim 15 — Same base combination as claim 1, plus a fourth anti-reflection layer on the light-outgoing surface of the combiner.

Dependent claims: 2 (face-opposition/connectivity geometry of the combiner), 3 (green selector <30°/≥30°), 4 (blue selector <30°/≥30°), 5 (first/second/third AR layers), 6 (selectors mounted on the incident surfaces), 7 (combiner reflects beam 1, transmits beam 2, reflects beam 3), 8 (fourth AR layer on outgoing surface), 9 (combiner is a light-combining prism), 10 (displays are micro-LED display panels).

Litigation / docket check — negative result

The results I retrieved concern other patent numbers and should not be attributed to US 11,671,569:

• Maxell, Ltd. v. Coretronic Corp. and Optoma Corp., No. 5:24-cv-00088-RWS-JBB (E.D. Tex., filed 2024-07-09) asserts U.S. Patent Nos. 7,159,988; 7,850,313; 8,593,580; 9,322,530; 9,547,226; 9,565,388; and 9,900,569 — none of which is 11,671,569. Coretronic/Optoma filed IPRs including IPR2025-00475 (’313 patent) and IPR2025-00477 (’530 patent). (https://www.courtlistener.com/docket/68928486/maxell-ltd-v-coretronic-corp/)
• Coretronic Corporation and Optoma Technology, Inc. v. Maxell, Ltd., No. 3:26-cv-00697 (N.D. Cal., filed 2026-04-22) — declaratory judgment action on U.S. Patent No. 8,075,142. (https://www.pacermonitor.com/public/case/62685893/Coretronic_Corporation_et_al_v_Maxell,_Ltd)
• Older Coretronic matters (Seiko Epson v. Coretronic, N.D. Cal. 06-CV-6946; Fed. Cir. 2011-1120) involve still earlier Epson patents.

Takeaway: As of my searches around this date, US 11,671,569 appears to be an unasserted, currently active Coretronic patent with no identified Federal Circuit 2026 appeal and no identified PTAB proceeding. I recommend verifying against the USPTO Patent Center "Patent Trial and Appeal Board" and "Assignment" tabs, and against PACER/RPX, before relying on this negative finding.

I'll run targeted searches for litigation naming this specific patent number.

Let me run additional targeted searches against litigation databases to make sure I'm not missing any proceeding naming this exact patent.

Let me check the Unified Patents litigation portal and run one more confirmation search.

Litigation Check — U.S. Patent No. 11,671,569

Bottom line: I found no litigation (district court, CAFC, or PTAB) naming U.S. Patent No. 11,671,569. In my searches, this patent does not appear as an asserted patent, a patent-in-suit, an IPR/PGR subject, or a CAFC appeal subject.

⚠️ Critical disambiguation warning — do not confuse two different "’569" patents

This is the single most important point in this analysis. Maxell's litigation against Coretronic/Optoma involves a patent colloquially called "the ’569 Patent" — that is U.S. Patent No. 9,900,569, not 11,671,569. These are:

Both the party roles and the asserted claim sets differ. Any search result referencing Maxell's "'569 patent," the GT1080HDRx/EH501/W316 invalidity contentions, or Maxell's "Count 7" concerns 9,900,569. Do not attribute those filings to 11,671,569.

(Note: the previously generated patent summary correctly identified this distinction in its own litigation check; this section confirms and reinforces it. No contradiction found.)

Cases that DO exist in the Coretronic/Maxell dispute family (none on 11,671,569)

These are listed so you can see exactly what has been searched and excluded:

Patent number "11,671,569" appears in none of the above — not in any asserted-patent list, invalidity contention table, IPR caption, or DJ complaint.

Searches performed

I searched for the literal strings "11,671,569" and "11671569" in combination with litigation, infringement, Coretronic, complaint, and docket terms, and reviewed results from CourtListener, PACER Monitor, PTAB petition documents (PTACTS), the CAFC opinions/orders, and Unified Patents-related docket material.

The only substantive hits on the "11671569" string were non-patent, non-litigation records (e.g., Czech government procurement order no. 11671569 and an HKEX filing attachment ID) — i.e., coincidental number matches, not the patent.

Conclusion

• Plaintiff(s): None identified.
• Defendant(s): None identified.
• Jurisdiction: N/A.
• Case number: N/A.
• Filing date: N/A.
• Outcome/status: N/A.

No litigation is known involving U.S. Patent No. 11,671,569 as of this review. Accordingly, by the patent's own dossier, it is an unasserted, currently active Coretronic patent (issued 2023-06-06; anticipated expiration 2041-09-15), and it is not among the Coretronic patents being litigated against Maxell or being challenged at the PTAB.

Caveats on completeness (be candid with the client)

1. I could not run a direct live query against USPTO Patent Center, PACER's full docket index, or the Unified Patents litigation portal's case list (the portal returned a patent-detail page rather than a litigation caselist for this number, and I exhausted my allotted search steps). My negative finding rests on web-indexed coverage of those sources, which is broad but not exhaustive — newly filed 2026 actions, sealed filings, or foreign proceedings may not be indexed yet.
2. Non-U.S. counterpart proceedings (CN 114650401B, EP 4016185B1, JP 7686931B2) were not checked for opposition/nullity/invalidity actions. Note that EP 4016185B1 (granted 2025-02-12) is a candidate for EPO opposition, and the UPC centrally handles EP patents — worth a targeted check if European exposure matters.
3. Before relying on this, verify directly via (a) USPTO Patent Center → "Patent Trial and Appeal Board" and "Assignment" tabs, (b) PACER/RPX and Docket Alarm, and (c) the EPO Register / UPC Registry for the EP family member.

I'll verify the structured "no proceedings" finding against live sources before writing the analysis.

Now let me confirm there's no IPR keyed to this specific patent and check the counterpart's challenge status.

Proceedings overview

Zero AIA trial proceedings are on file for US 11,671,569. Per the structured USPTO Open Data Portal (ODP) record supplied with this prompt and confirmed by my live searches, there are 0 active, 0 claims-invalidated, 0 claims-sustained, 0 settled, and 0 institution-denied IPR/PGR/CBM proceedings naming this patent — meaning a defendant gets no free invalidity from the Board (all 15 claims stand exactly as issued), but also faces no adverse claim-cancellation record and no petitioner/privy is currently estopped as to any ground.

No proceedings on file

I cannot populate the per-proceeding template because there is nothing to populate. Rather than leave the negative finding unverified, here is what I actually checked:

Number-collision warning for future searches. If you search dockets or the web for "the '569 patent" in a Coretronic context, you will land on Maxell's U.S. Patent No. 9,900,569 — a different patent, different owner, different art. For example, Coretronic/Optoma's opposition to Maxell's request for discretionary denial is captioned against "U.S. Patent No. 9,900,569," not 11,671,569 (PTAB E2E petition document 1557827). Do not import any outcome from the Maxell family onto this patent.

Adjacent but distinct matter (context only — do not attribute to this patent): Maxell, Ltd. v. Coretronic Corp. and Optoma Corp., No. 5:24-cv-00088-RWS-JBB (E.D. Tex.), asserts Maxell patents 7,159,988; 7,850,313; 8,593,580; 9,322,530; 9,547,226; 9,565,388; and 9,900,569 (CourtListener docket). Coretronic and Optoma filed a wave of IPRs against those Maxell patents (e.g., IPR2025-00474, -00475, -00476, -00477, -00941, -00942). Third-party dockets indicate at least one of these (IPR2025-00942) terminated in discretionary denial on 2025-09-26, and Maxell's papers in the '569 patent IPR assert that "the Director already denied four petitions related to the same District Court litigation."

⚠️ Data-quality flag: the aggregator page reporting IPR2025-00942 lists the "judges" as "Robert W. Schroeder III and Judge Robert W. Schroeder II" — those are E.D. Tex. district judges, not APJs. That aggregator is unreliable for panel composition. Treat its case-status labels as leads requiring confirmation on PTAB E2E, not as findings.

Strategic summary

Claim status: everything is untested. No claim of 11,671,569 has ever been construed by the Board or canceled in an AIA trial. All six independent claims (1, 11, 12, 13, 14, 15) and all nine dependent claims (2–10) remain live. There is therefore no narrowed claim set to work from and no FWD to quote — a defendant cannot point to a single claim the Board has killed. Conversely, the patent owner cannot point to a Board decision validating any claim against art; the patent's validity is entirely unadjudicated outside prosecution.

Estoppel landscape: empty, and that cuts both ways. Because no IPR has been instituted against this patent, no § 315(e)(2) estoppel attaches to anyone — no petitioner or privy is barred from raising any ground, and equally, a defendant has no prior petitioner's work product to ride on. Every ground a defendant might want to raise (§ 102/§ 103 on any reference) remains fully available. Two structural points matter more than estoppel here: (1) the § 315(b) one-year clock has not started for anyone who has not been served, so a defendant served now has 12 months from service to petition; and (2) the patent issued 2023-06-06, so the § 321 PGR window closed 2024-03-06 and the CBM vehicle is unavailable — IPR under § 311 (and ex parte reexamination) are the only remaining AIA/administrative validity channels.

Pattern signals. Coretronic is not a passive patent owner: in the Maxell litigation it is a serial, sophisticated IPR petitioner, filing six-plus petitions with Sotera-style stipulations and stay motions. That signal runs in the opposite direction from a "troll" profile — this is an operating projector manufacturer (Hsin-Chu, Taiwan) with a deep optical-engine portfolio and in-house familiarity with PTAB practice. Coretronic patents also appear in the Unified Patents patent portal (e.g., a profile page for Coretronic's US 11,531,258), but a profile page is not a filing; I found no Unified Patents (or any other defensive aggregator) petition against 11,671,569. The realistic trigger for a future IPR is this patent being asserted — its E.D. Tex. sister patents were asserted, and IPRs followed.

One explicit non-finding: I did not verify whether the EP counterpart EP4016185B1 has drawn an EPO opposition, and I am not asserting that it has or has not. That is an EPO register question, not a PTAB question, but it is the most plausible place a challenge to this family has been filed.

Recommended next steps

1. State the negative plainly in any defense memo. "US 11,671,569 has never been challenged at the PTAB. All 15 claims are intact and there is no FWD, no institution decision, and no CAFC appeal to cite." Any argument built on an IPR outcome on this patent would be fabricated — there isn't one.
2. Re-verify before relying on this. Confirm on PTAB E2E by searching the patent number directly (not the "'569 patent" shorthand, which collides with Maxell's 9,900,569), and check the USPTO Patent Center "PTAB" and "Assignment" tabs. The ODP ingest can lag recent filings.
3. If you are a defendant weighing an IPR, you are on the clock. Twelve months from service under § 315(b). Note the discretionary-denial environment: papers filed in the adjacent Maxell matter invoke a March 26, 2025 Acting Director's Memorandum on discretionary denial, and the Director reportedly denied four related petitions over parallel-litigation concerns. Budget for a Fintiv-style fight, and consider a Sotera-style stipulation plus an early stay motion — the same toolkit Coretronic itself has deployed.
4. Map the challenge target before drafting. The claim set is unusual: six independent claims (1, 11, 12, 13, 14, 15) that each recite the same base combination with one added feature (red selector / green selector / blue selector / three AR layers / selectors on the incident faces / fourth AR layer on the exit face). Claims 11–15 are near-restatements of claim 1's subject matter, so a petition should address all six independents rather than assuming that knocking out claim 1 knocks out the family. The genuinely load-bearing limitation is the "<30° transmit / ≥30° reflect" angular selectivity, whose § 112 written-description and § 103 posture on the disclosed 30° figure is where the real fight is.
5. Watch for the trigger event. Because the E.D. Tex. Maxell case shows Coretronic's competitors litigating projection patents against it, a mirror-image assertion of 11,671,569 (or a family member like CN114650401B / JP7686931B2 / EP4016185B1) is the most likely precursor to an IPR. Monitor PTAB E2E for a petition and CourtListener for a new complaint naming 11,671,569.
6. Do not rely on the Google Patents "Citations (23)" table as an art map. It contains plainly unrelated references — e.g., CN1275070A (hair-dyeing compositions) and CN1278163A (microcrystalline cellulose/alginate pharmaceutical suspensions) — which are almost certainly citation-table noise rather than projection-system art. Pull the actual IDS/PTO-892 from Patent Center when assessing § 325(d) risk.

I'll verify the assignment record and check for any additional recorded transfers.

Inventors

Pattern check: A single-inventor US filing is unremarkable for a light-engine sub-assembly improvement. There is no evidence of inventor departure, a mass-inventor exodus, or a "team walks out and the portfolio is fire-sold" pattern — there is only one inventor, and the same name recurs across Coretronic's projector/light-source portfolio (e.g., US 2020/0117051 A1, "Light Source Module and Display Device," inventor Huang Yu-An, assignee Coretronic Corp.), which is consistent with a continuing employee, not a departing one. I could not independently confirm his current employment status; that is an open item, not a finding.

Original assignee

• Entity: CORETRONIC CORPORATION, No. 11, Li-Hsing Road, Hsinchu Science Park, Hsin-Chu 300, Taiwan (as listed on the corresponding EP/JP family members).
• Primary line of business: Coretronic (中強光電) is a large Taiwanese optoelectronics manufacturer — LCD backlight modules, optical components, and projection/display products (it is the parent of the Optoma projector brand). It is a publicly traded company (Taiwan Stock Exchange; I believe the ticker is 5371, but I have not re-verified this in this session and flag it as lower-confidence).
• Did they ship a product embodying the claims? The claims are directed to a component-level arrangement (an X-cube light-combining module plus wavelength/angle-selective films in a micro-LED three-panel engine). Coretronic is an operating projector manufacturer and files extensively in exactly this CPC space (G03B21/20, H04N9/31, G02B27/12), so the patent is squarely in its commercial field. However, I cannot confirm that any specific shipping Coretronic/Optoma product practices claims 1–15 — the "angle selector" (band-pass film transmitting <30° incidence and reflecting ≥30°) is an internal engine detail not discernible from product literature. Treat "ships an embodying product" as unconfirmed, not established.
• Current status: Operating. No bankruptcy, dissolution, or acquisition of Coretronic appears in any record I reviewed. The patent is listed Active with anticipated expiration 2041-09-15.

Assignment timeline

The Google Patents legal-events record for this patent shows exactly one recorded assignment. I was not able to load the live USPTO Assignment Center hit page for the patent number in this session, so the reel/frame and parties below are taken from the patent's own legal-events record (Google Patents, https://patents.google.com/patent/[US11671569](/patent/US11671569)/en) rather than from a directly retrieved Assignment Center abstract. The reel/frame, parties, and dates are corroborated by two independent entries in that record.

• 2021-09-15 (executed) / recorded 2021-09-24 — Reel 057585/0726
  • Conveyance: Assignment — "ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS)"; recorded under USPTO event code AS (Assignment).
  • Assignor: HUANG, Yu-An (individual inventor).
  • Assignee: CORETRONIC CORPORATION, Taiwan (entity status noted as LARGE ENTITY / undis counted).
  • Correspondent: Not stated in the Google Patents legal-events extract — I could not retrieve the recorded correspondent for this specific reel/frame and will not guess it. Strong circumstantial evidence points to JCIPRNET (Taiwan firm; correspondence address P.O. Box 600, Taipei Guting, Taipei City, Taiwan 10099; email USA@JCIPGroup.com), which is the firm of record on the patent's face (see below) and whose correspondence block appears on Coretronic-related USPTO assignment filings (e.g., legacy-assignments.uspto.gov document 043977/0313, showing "Correspondent Name: JCIPRNET"). Flag: that legacy document is not reel 057585/0726, so this is an inference about the firm's general role, not a confirmed correspondent of record for this patent.
  • Context: Internal/initial acquisition — routine employee-inventor-to-employer assignment, executed the same day the US application was filed. This is the only link in the chain.

Attorney/agent of record on the patent itself (74): JCIPRNET (J.C. International Patent / "JCIP"; practitioners of record associated with this firm include Joseph G. Chu, Reg. No. 64596, and Joshua A. Schaul, Reg. No. 57691). JCIPRNET is the recurring prosecution correspondent for the entire Coretronic US portfolio — third-party portfolio analytics (PatentBots) attribute ~77 of 84 of Coretronic's recently issued US patents to JCIPRNET. See the recurrence discussion in Signal 3.

If the Assignment Center shows no further hits beyond this one reel/frame, that is the finding: there has been no post-issuance transfer of any kind — no security agreement, no merger, no change of name, no license, no release, no correction. Coretronic remains the sole owner of record.

Family cross-check (no transfers abroad either): the same invention is owned by Coretronic in every jurisdiction — CN114650401B, EP4016185B1, JP7686931B2, and the Korean members KR20220089621A (status: not active — ceased) and KR20240112794A (not active — withdrawn). None of the foreign records I saw shows an assignee other than Coretronic. There is no evident "US rights carved out and sold offshore" pattern.

Timeline diagram

timeline
    title Ownership of US 11671569
    2020 : CN priority application filed
         : Coretronic named applicant
    2021 : US 17/475343 filed Sep 15
         : Inventor Huang assigns to Coretronic
         : Assignment recorded Sep 24
    2023 : US 11671569 B2 issued Jun 6
    2041 : Anticipated expiration Sep 15

NPE / troll-pattern signals

1. Shell-entity transfer — not present. The sole recorded assignee is CORETRONIC CORPORATION, a named operating manufacturer headquartered at 11 Li-Hsing Road, Hsinchu Science Park — a real corporate campus address, not a registered-agent service address. There is no "IP / Holdings / Licensing / Ventures" LLC anywhere in the chain, per reel 057585/0726 (2021-09-24).

2. Known asserter in the chain — not present. Neither the assignor (Yu-An Huang) nor the assignee (Coretronic) matches any entity on the listed NPE rosters (Acacia, Marathon, Intellectual Ventures, IPNav, Wi-LAN, Conversant/Mosaid, Vringo, Pendrell, Innovatio, MPHJ, Lumen View, Round Rock, etc.). The only Coretronic litigation I found in the prior analysis is defensive/asymmetric in both directions — Coretronic/Optoma were sued by Maxell (E.D. Tex. 5:24-cv-00088) and filed a DJ action against Maxell (N.D. Cal. 3:26-cv-00697) — and US 11,671,569 is not among the asserted patents. Coretronic is here a litigation target, not a serial asserter.

3. Repeat correspondent across the chain — not present as an NPE signal (recurrence exists, but benign). There is only one recorded link, so recurrence within this chain is impossible. Across the broader portfolio, JCIPRNET (Taiwan; USA@JCIPGroup.com) recurs as the attorney/correspondent of record on Coretronic's US filings (~77 of 84 recent issuances) — including the patent's own face citation, "Attorney, Agent, or Firm — JCIPRNET." Per the task's own caution, I am not treating this as a signal: JCIPRNET is a Taiwan-outbound prosecution firm serving one large operating client, not an attorney whose name appears on Unified Patents / RPX / Patent Progress NPE-assertion lists. One-client recurrence at an operating company is the opposite of the "shell LLCs change, the lawyer doesn't" tell. I could not verify the correspondent on reel 057585/0726 specifically.

4. Cascading transfers — not present. There is a single assignment across the patent's entire life (2021-09-24). No chained LLCs, no <24-month serial transfers, no shared correspondent addressing among multiple assignees, because there are no multiple assignees.

5. Pre-litigation transfer — not present. The only assignment (executed 2021-09-15) pre-dates issuance by ~21 months and is a routine inventor-to-employer conveyance. No infringement suit naming this patent has been identified, so there is no assignment within 6 months of a first suit — the defining fact of this signal is absent.

6. Bankruptcy fire-sale — not present. No Chapter 7/11 proceeding involving Coretronic appears in any record reviewed; Coretronic's status is operating, and the patent is Active with fees current.

7. Privateering — not present. There is no transfer to a third-party NPE asserting on Coretronic's behalf. Coretronic retains ownership directly in the US and in all four foreign family members, which is inconsistent with a privateering structure (those normally show an outbound assignment to the asserter).

8. Defensive aggregator — not present. The chain does not terminate at RPX, AST, LOT Network, Unified Patents, or OIN. Title sits with the operating manufacturer itself; the patent has not been "neutralized" by transfer to a defensive pool.

Verdict

Insufficient data — but affirmatively non-NPE, i.e. a conventional single-owner operating-company patent.

The chain consists of exactly one link: the inventor-to-employer assignment executed 2021-09-15 and recorded 2021-09-24 at Reel 057585/Frame 0726, moving title from Yu-An Huang to CORETRONIC CORPORATION. Under the rubric, "only the original assignment on record" is expressly the Insufficient data case, and that is the honest call — there is no post-issuance transfer chain to analyze. That said, every one of the eight affirmative NPE signals is not present on the evidence: a real, publicly traded Taiwanese projector manufacturer owns the patent directly; no shell LLC, no known asserter, no cascading transfers, no pre-suit assignment, no bankruptcy sale, no privateering, and no defensive-aggregator termination. The JCIPRNET recurrence is a portfolio-wide prosecution relationship with one large operating client and is not an NPE tell.

Verification links:

• USPTO Assignment Center (search by patent number 11671569): https://assignmentcenter.uspto.gov/
• Legacy assignment index (same underlying records): https://assignment.uspto.gov/patent/index.html
• Google Patents legal events (source of the reel/frame above): https://patents.google.com/patent/US11671569/en

Caveats / open items: I could not load the live Assignment Center record page for this patent in this session, so (a) the correspondent of record on reel 057585/0726 is unverified and (b) I cannot rule out a very recent recording that post-dates the indexed legal-events extract. Recommend confirming the correspondent field and pulling a full "Assignments" tab listing in Patent Center before relying on the single-link finding.

I'll verify the patent on USPTO-facing sources and pull details on the cited references, then analyze each for § 102 relevance.

Let me pull details on the most technically relevant cited references — particularly the "angle selector" and X-cube combiner references.

Prior-Art Analysis — US 11,671,569 B2 ("Projection device," Coretronic)

0. Scope note and method

• Patent verified against the authoritative full text you supplied (https://patents.google.com/patent/US11671569/en): US 11,671,569 B2, App. No. 17/475,343, filed 2021‑09‑15, granted 2023‑06‑06, priority CN 202011515371.5 filed 2020‑12‑21, assignee Coretronic. I did not auto‑correct the number and I did not substitute a "similar" number.
• I could not open a live USPTO Patent Center / PATENT FULL-TEXT query in this session, so the citation set below is taken from the authoritative patent text (the "Citations (23)" and "Family Cites Families (13)" lists), not from a fresh USPTO fetch. Where a reference's substance was not retrievable, I say so and assess on the title/date record only.
• Governing law: the application was filed 2021‑09‑15 with a 2020‑12‑21 priority date → post‑AIA 35 U.S.C. §§ 102/103 apply. Effective filing date for § 102(a)(1) purposes is 2020‑12‑21; a printed publication or patent "before" that date is § 102(a)(1) art, and a US patent/application publication with an earlier effective filing date is § 102(a)(2) art.

Important framing for § 102: anticipation requires a single reference disclosing every element of a claim. The independent claims (1, 11, 12, 13, 14, 15) all require, at minimum, (i) three displays → three image beams, (ii) a combiner with three incident surfaces + an outgoing surface, (iii) three "angle selectors" each between a display and the combiner, and (iv) a projection lens at the outgoing surface. The distinguishing feature the examiner's art was evidently directed at is the "angle selector" = a color band‑pass filter that transmits its color at <30° incidence and reflects it at ≥30°.

1. The 23 examiner‑cited references (from the patent's own citation list)

Reading of the citation set

Two of the 23 (CN1275070A, CN1278163A) are facially unrelated to projection and are almost certainly citation‑mapping artifacts in the Google Patents listing — I flag them rather than treat them as meaningful prior art. The remainder are projection/optical‑element references whose combined thrust is the combiner‑and‑film architecture (CN210403049U, US9448415, US2008/0094576, US2007/0242228) and the angularly selective filter concept (US2011/0013179A1).

2. Family‑level cites (13) — relevant because they were cited against the CN/EP/JP counterparts

These appear in the patent's "Family Cites Families" list and are the references the foreign examiners (CN/EP/JP) weighed; several are more on‑point to the X‑cube/image‑display subject matter than the examiner's US list:

3. Most‑relevant prior art — ranked, with § 102/§ 103 mapping

Rank 1 — CN 210403049 U (Sunny Optical), pub. 2020‑04‑24. The single most structurally similar reference: three monochrome Micro‑LED arrays → an X‑cube color‑combining device with crossed wavelength‑selective film systems → imaging lens group. It maps to the base combination of every independent claim but omits the "angle selector."

• § 102: could arguably anticipate claim 10 if claim 10 were read in isolation — but claim 10 depends from claim 1, so it is not anticipated. It does not anticipate claims 1, 11, 12, 13, 14, or 15.
• § 103: the primary reference against claims 1–15 when combined with an angle‑selector teaching.

Rank 2 — US 2011/0013179 A1 (Philips), pub. 2011‑01‑20. Supplies the "angle selector" concept: a fixed light‑selecting means transmitting only within a limited acceptance angle, with an optional dichroic interference stack whose transmission/reflection is angle‑dependent. It supplies the missing element for the Rank‑1 combination but, standing alone on a photometer, anticipates no claim (no displays, no combiner, no <30°/≥30° recitation).

Rank 3 — US 9,448,415 B2 (OmniVision), pub. 2016‑09‑20. Discloses a combiner cube + PBS + retarder stacks + projector lens in a compact/near‑eye projector. Reinforces the combiner/lens architecture; anticipates no claim (polarization solution, no per‑panel color angle selector).

Rank 4 — US 2008/0094576 A1 (3M) and US 2007/0242228 A1 (Colorlink). Both concern color‑selective / polarization optical films in projection paths — § 103 background for the "formed by stacking high‑ and low‑refractive‑index layers" film limitation, not § 102 art for any claim.

Rank 5 — US 2021/0373429 A1 (DigiEngin), pub. 2021‑12‑02. Compact multi‑channel light engine; date‑disqualified as § 102(a)(1) art and cannot anticipate.

4. Bottom line on § 102

• No cited reference anticipates independent claims 1, 11, 12, 13, 14, or 15. In each, the missing element is the same: a per‑panel "angle selector" that is a color band‑pass filter transmitting its own image beam at <30° incidence and reflecting it at ≥30° (claims 1/11/12), and/or the AR‑layer (claims 13/15) or on‑surface mounting (claim 14) features.
• The nearest single reference, CN 210403049 U, discloses the full base architecture (three Micro‑LED displays, X‑cube combiner with three incident surfaces + one exit surface, crossed color‑selective films, imaging/projection lens) and would anticipate claims 1, 11, 12, 13, 14, 15 only if the "angle selector" limitation were disregarded — which it cannot be, since it is expressly recited. It is therefore a § 103, not a § 102, reference.
• US 2011/0013179 A1 supplies the angle‑selector concept but is a photometer, so it also anticipates nothing on its own.
• The two clearly irrelevant citations (CN1275070A, CN1278163A) should be disregarded as apparent citation‑listing artifacts, and US 2021/0373429 A1 is date‑disqualified as § 102(a)(1) art.

5. Caveats

• I worked from the authoritative patent text's citation lists; I did not obtain a fresh USPTO Patent Center / PAIR "References Cited" fetch in this session, and I could not retrieve the full text of many of the 23 foreign/older references. Where I assess on title/date only, I say so.
• "Potentially anticipates" is used strictly in the § 102 sense (single‑reference, all‑elements). For most of these references the honest answer is "none — § 103 relevance only," and I have said so rather than manufacture an anticipation theory.
• If you want a definitive § 102/§ 103 position, the next step is a full‑text pull of CN210403049U and US2011/0013179A1 (both retrieved in part here) plus a citation‑corrected USPTO "References Cited" list, since at least two entries in the Google Patents list are demonstrably unrelated to the subject matter.

I'll verify the key reference disclosures before building the § 103 combinations.

Let me confirm the dates/ownership of two additional references surfaced in the search that bear directly on motivation.

Obviousness Analysis Under 35 U.S.C. § 103 — U.S. Patent No. 11,671,569 B2

Scope note. This section builds on the Prior-Art section above and does not re-catalogue the 23 examiner cites or the 13 family cites. Where I quote a reference's disclosure, it is a live fetch performed for this section. Consistent with the operating rules, all alphanumeric identifiers are reproduced literally and uncorrected.

Contradiction check against the earlier sections. None found — the live fetch confirms and sharpens the earlier finding that CN210403049U is the closest art but omits the "angle selector." I was, however, able to retrieve CN210403049U's actual claim text and ¶¶[0023]–[0085] verbatim for this section (the earlier section flagged those as "retrieved in part"), and I identified three references that are not in the patent's citation list and that are, in my view, more on-point on the key motivation issue than anything the examiner cited. I flag those explicitly as new material, not as part of the earlier Prior-Art section.

1. The legal frame

Post-AIA § 103 (priority 2020-12-21). KSR Int'l Co. v. Teleflex Inc., 550 U.S. 398 (2007) controls. The relevant branches of KSR here:

• Known technique, known problem. A "technique has been used to improve one device, and a person of ordinary skill in the art would recognize that it would improve similar devices in the same way, using the technique is obvious unless its actual application is beyond his or her skill." 550 U.S. at 417.
• Obvious to try. Where there is "a finite number of identified, predictable solutions," pursuit of the known options is obvious. Id. at 421; In re O'Farrell, 853 F.2d 894 (Fed. Cir. 1988).
• Predictable variation of a result-effective variable. In re Aller, 220 F.2d 454 (CCPA 1955); In re Woodruff, 919 F.2d 1575 (Fed. Cir. 1990) (recited range overlapping or merely adjacent the prior-art range is obvious); In re Boesch, 617 F.2d 272 (CCPA 1980) (numeric limitation obvious absent a showing of criticality).
• MPEP § 2143 for the articulated-reason and reasonable-expectation requirements. A motivation may be implicit in the art ("inferences and creative steps that a person of ordinary skill in the art would employ"), KSR, 550 U.S. at 418.

The single contested element. Every one of the six independent claims (1, 11, 12, 13, 14, 15) recites the same base combination: three displays → three image beams; a combiner with three light-incident surfaces and one light-outgoing surface; three "angle selectors," one between each display and the combiner; and a projection lens at the outgoing surface. As the earlier section established, CN210403049U discloses everything in that base combination. The entire § 103 dispute therefore reduces to (a) the "angle selector" (angularly selective color filter) and (b) the recitation of 30°, plus the secondary features added by claims 5/13 (AR layers), 8/15 (fourth AR layer), and 6/14 (on-surface mounting).

2. What the closest reference actually says — CN210403049U (verbatim, live fetch)

The live fetch materially strengthens the mapping. CN210403049U (舜宇光学(浙江)研究院有限公司 / Sunny Optical (Zhejiang) Research Institute; 申请日 2019-11-13; 授权公告日 2020-04-24 — before the 2020-12-21 critical date) discloses:

• Three monochrome Micro-LED arrays → three image beams. Claim 7: 「所述Micro LED显示装置包括一用于发射第一路单色图像光的第一单色Micro LED阵列、一用于发射第二路单色图像光的第二单色Micro LED阵列以及一用于发射第三路单色图像光的第三单色Micro LED阵列，其中…分别被对应地设置于所述白色装置的三个入射面，并且所述成像透镜组对应于所述白色装置的出射面」 — three arrays on the three incident faces, imaging lens at the exit face.
• X-cube structure with three incident faces and one exit face. ¶[0083]: 四个直角棱镜沿直角面胶合…形成具有X-Cube结构的所述合色装置…三个所述直角棱镜的斜面分别面向…第一/第二/第三单色Micro LED阵列，以作为…三个入射面；并且剩余的一个…斜面向所述成像透镜组，以作为…一个出射面.
• Crossed wavelength-selective film systems performing exactly the R/G/B routing. ¶[0084]: 所述第一膜系22B用于反射来自所述第二单色Micro LED阵列的…第二单色图像光…并透射…第一…和第三…单色图像光；所述第二膜系23B用于反射来自所述第三单色Micro LED阵列的…第三单色图像光…并透射…第一…和第二…
• The films are red-reflecting / blue-reflecting pairs. ¶[0023]: 「所述第一膜系为反红光膜或反蓝光膜，并且所述第二膜系相应地为所述反蓝光膜或所述反红光膜.」
• It may be an X-cube or X-plate. ¶[0024]: 「所述合色装置为X合色棱镜或X合色板.」
• Geometry. ¶[0084]: 所述合色装置20B中对应于所述第一单色Micro LED阵列11A的所述入射面与所述合色装置20B的所述出射面相对.
• The reference itself attacks the emission-angle problem — by collimation. Claim 3: 微准直阵列…用于准直处理经由所述Micro LED发射的该像素光束; claim 5: 所述微准直元件为选自微准直透镜、锥棒、非连环透镜以及TR透镜中的一种.

Consequence. CN210403049U maps to the base combination of claims 1, 11, 12, 13, 14, 15 and to dependent claims 2, 7, 9, and 10 (micro-LED panels). Its only gap is the angularly selective film at <30° / ≥30°.

3. The gap-filling reference — US 2011/0013179 A1 (Koninklijke Philips Electronics)

Live fetch confirms the earlier section's characterization, and adds the critical detail that the element is functionally the claimed selector:

• Claim 1: "a fixed light selecting means for transmitting light incident thereon within a limited acceptance angle," optically connected to a light redirecting means.
• The Japanese counterpart text is explicit on the blocking behavior: 「固定された光選択手段に入射する光のうち該許容角度内の光が…透過させられ、…該許容角度外の光は、外部へ反射させられるか又は該固定された…」 — light outside the acceptance angle is reflected outward (or absorbed). The "reflected" alternative is exactly the claimed behavior.
• On the film itself: 「前記少なくとも１つの光フィルタの、特定の波長の光の透過率及び／又は反射率は、前記少なくとも１つの光フィルタにおける前記光の入射の角度に依存する。斯かるフィルタは好適には、二色性干渉積層を有する。」 — a filter whose transmittance and/or reflectance for a specific wavelength depends on the angle of incidence, preferably comprising a dichroic interference stack. That is the patent's own definition of the angle selector ("optical films formed by stacking high and low refractive indexes").

Characterization for § 103: US 2011/0013179 A1 anticipates nothing by itself (it is a photometer — no displays, no combiner, no projection lens, and no 30° figure). It is a teaching-of-a-known-element reference: an interference filter that passes its band within an acceptance angle and reflects outside it. KSR step two is met by using that element for its known function (blocking high-angle light) in the projector architecture of CN210403049U.

4. New references located for this section (NOT in the patent's citation list) — the motivation backbone

These three were surfaced by live search, are not among the 23 examiner cites or the 13 family cites, and go directly to why a skilled person would have made the combination.

4.1 US 7,020,379 B2 — "Illumination optical system including light separation/integration device having diffraction device…" (granted 2006-03-28; EP counterpart EP1377075B1). This is the closest art on the problem statement and placement:

• Claim 1 (as granted in the EP counterpart): "the light separation/integration device (22-2, 32-2) is an X-cube … includes a diffraction device (21, 31) … directly formed on at least one incident side, and the diffraction device … is configured to diffract the light such that the light is incident on a coating layer of the X-cube at a diverging angle of a minimum of 0° and a maximum of 8°."
• Specification: "the X-cube … includes light sources 22-1 which emit different color light beams … and an X-cube 22-2 provided with a diffraction device 21 on each light incident side thereof. The diffraction devices 21 adjust incident angles of the different color light beams … respectively."
• Placement, in the alternative: "may be used as the diffraction device 21 and can be directly formed on an incident side of the X-cube 22-2, or separately manufactured and then attached to the X-cube 22-2."
• Why the angle must be limited — FIG. 3's transmissivity-vs-angle graph: "...the transmissivity is highest where light having a wavelength ranging from 400 nm to 700 nm is incident … at an angle of 0 … As the incident angle increases, the transmissivity decreases. Where the incident angle exceeds 11 degrees … and is at least 12 degrees …, the transmissivity decreases below 50%."

So: an X-cube combiner with a discrete angle-conditioning element on each incident face, whose express purpose is to constrain the incidence angle at the X-cube so the combiner works at high efficiency — twenty years before this patent, with a numeric cut-off of 8–12°.

4.2 US 7,330,314 B1 — "Color combiner for solid-state light sources" (Corning Incorporated; granted 2008-02-12; filed 2005-02-28). This supplies the recognition, in LED-based color combining, that angular spread is the villain: "To reduce the inherent problems that result from poor dichroic response at higher incident angles, the present invention provides a curved dichroic surface … so that … source illumination is incident at reduced angles." Its own summary states the object as "a color combiner using one or more dichroic surfaces that are suitably curved so that they receive light from an LED source at low incident angles." FIG. 2A–2C illustrate X-prism/Philips-prism dichroic color mixing with LED sources.

4.3 WO 2007/113777 A3 — "Angular dependent element positioned for color tuning" (Philips). "A light emitting device includes a light source … and an angular dependent element … that filters the light. The angular dependent element may be, e.g., a dichroic filter, dichroic mirror, a cholesteric film, a diffractive filter, and a holographic filter… By adjusting the angular position of the angular dependent filter with respect to the optical axis, the wavelengths of light produced … can be controlled." Confirms the angular-dependence of dichroic filters was a routinized design lever in the same corporate family as US 2011/0013179 A1.

Caveat: I did not confirm US 7,020,379 B2's assignee in this session (only its grant date and EP counterpart), and for US 7,330,314 B1 the assignee comes from the Google Patents citation listing. Neither caveat affects the prior-art status of the disclosures.

Not usable (flagged): US 2025/0110345 A1 ("COMPACT XCUBE LIGHT ENGINE ASSEMBLY") surfaced in search and describes the same X-cube/monochrome-microLED architecture, and CN 118043736 A surfaced as well — but both are 2025-series publications. I did not verify their effective filing dates, and on their face they post-date the 2020-12-21 critical date. Do not cite them as prior art without a priority-date pull.

5. Combination 1 (primary): CN210403049U + US 2011/0013179 A1

The proposed rejection. Combine the X-cube / three-microLED-array / crossed-dichroic-film / imaging-lens engine of CN210403049U with the angle-selective dichroic filter of US 2011/0013179 A1, placing one such filter in each of the three optical paths between a micro-LED array and its corresponding X-cube incident face, and selecting a filter whose acceptance cut-off is 30°.

Articulated motivation (MPEP § 2143(1)(C) — "obvious to try" / design incentive):

1. The problem is admitted and common to the field. The patent's own Background concedes that the micro-LED emitting half-angle is large and that "light greater than the effective light angle is only totally reflected inside the light-combining module," producing stray light. CN210403049U attacks the same problem inside the same architecture (its claim 3/5 micro-collimating arrays collimate the micro-LED pixel beams). And US 7,020,379 B2 states the generic form of it: X-cube coating transmissivity "decreases below 50%" once incidence exceeds ~11–12°, so incident angle must be "adjusted … within a predetermined range." When the problem is common knowledge in the art and is stated in the primary reference itself, the motivation requirement is satisfied without hindsight.
2. A finite, identified, predictable set of solutions. The art knew essentially two ways to fix X-cube angular spread: re-collimate the light (micro-lens arrays, tapered rods, TR lenses — CN210403049U claim 5; DOE/HOE — US 7,020,379 B2) or filter the light by acceptance angle (US 2011/0013179 A1). That is the O'Farrell / KSR situation precisely. US 2011/0013179 A1 is the second option, disclosed as a discrete "fixed light selecting means."
3. Predictable result, no change in principle of operation. The Philips filter is a dichroic interference stack whose transmittance/reflectance is incidence-angle-dependent. Adding an interference filter to a projector's per-panel optical path is the paradigm "known element used for its known function." KSR, 550 U.S. at 417. Nothing in the combination is "beyond the skill" of a projector optical designer; the patent's own specification defines the selector as nothing more than "optical films formed by stacking high and low refractive indexes."
4. Physically coherent, which undercuts any "inoperable" defense. Because a dichroic band-pass blue-shifts toward shorter wavelengths with increasing incidence angle, a red band-pass at high incidence no longer passes red — it reflects it. So a red band-pass designed to pass 610–650 nm at normal incidence will, for a red beam arriving at ≥30°, reflect rather than transmit. The prior art's angular-dependence teaching (US 2011/0013179 A1; WO 2007/113777 A3) makes this a predictable consequence, not a lucky one.
5. Market/design pressure. Both the patent's Background and CN210403049U frame this as the enabling problem for small XR/near-eye engines ("够满足市场对小体积、轻重量"), and CN210403049U is expressly a near-eye display engine. Compactness is a recognized design incentive and, under KSR, is itself a permissible reason to combine.

Claims reached by Combination 1 (base art + Philips):

Note on Claim 3 (dependent on 1). Because claim 3 depends from claim 1, the rejection for claim 3 must add the green-selector limitation on top of the claim-1 combination. That is met by combining a green band-pass into the same filter stack design — a change in center wavelength only. CN210403049U's own green-transmitting path (films 22B/23B both transmit the first beam) supplies the green channel context.

6. Combination 2: + an anti-reflection teaching → claims 5, 13, 8, 15

Claims 5/13 (AR layers on the three incident surfaces) and claims 8/15 (fourth AR layer on the outgoing surface) are the weakest part of the patent from a § 103 standpoint, precisely because they add nothing functional to the invention:

• Both the patent and its claims present the AR layers as an efficiency feature ("the light-outgoing efficiency … is improved effectively"), not as part of the stray-light/contrast solution. Efficiency improvement by AR coating is the textbook predictable result of a known technique.
• Art of record that supports it: US 2008/0094576 A1 (3M, "Projection system incorporating color correcting element") and US 2010/0007860 A1 (Ueda, "Composite optical element and projection optical device") both place functional optical films/coatings within projection light paths; US 7,020,379 B2 expressly contemplates the angle-conditioning element being "directly formed on" the X-cube's incident side — i.e., face-integrated thin-film processing of the X-cube, the very manufacturing step the AR layers require.
• Combined with the general state of the art (CPC G02B1/11, "Anti-reflection coatings," one of this patent's own classifications), the AR layers are a design choice / routine optimization — In re Kuhle, 526 F.2d 553 (CCPA 1975) (a limitation whose only effect is to make a known structure work as intended adds nothing patentable).

Caveat I want on the record: the earlier Prior-Art section correctly flagged that the examiner's cited set is thin on dedicated AR art. So claims 5/13/8/15 are obvious as a matter of law (design choice), but the evidence basis is weaker than for the selector claims, and a challenger should pair them with a general AR-coating reference rather than relying on the KSR design-choice argument alone.

7. Combination 3: on-face mounting → claims 6 and 14

Claim 14 (selectors "disposed on" the three light-incident surfaces) and claim 6 (same, depending from 1). This limitation is squarely foreclosed by US 7,020,379 B2, which discloses the identical placement question and answers it in the alternative: the angle-conditioning element "can be directly formed on an incident side of the X-cube … or separately manufactured and then attached to the X-cube."

Read against claim 1's "configured between the first display and the light-combining module" and claim 14's "disposed on the light-incident surfaces," the prior art teaches both mechanical arrangements for the same kind of element in the same kind of engine. Claim 14 is thus obvious over CN210403049U + US 2011/0013179 A1 + US 7,020,379 B2 (and, alternatively, over CN210403049U's own FIG. 5 X-cube configuration, in which the arrays and the imaging lens sit directly at the prism faces). Confidence: High.

8. The 30° figure — where the real fight is

This is the only limitation with any plausible § 103 defense, and it is not a strong one.

The rejection. 30° is an optimization of a result-effective variable. The patent presents no data establishing criticality: the sole experiment (FIG. 2) compares a build with the third angle selector to a build without it ("the stray light is reduced by 66%"), not 30° against 25°, 35°, or any other cut-off. Under In re Aller and In re Boesch, where the specification discloses no criticality and no comparative data across the recited range, the range is a design parameter. The prior art bracket reinforces this: US 7,020,379 B2's X-cube loses half its transmissivity above ~11–12°, and US 7,020,379 B2's claim recites 0°–8°. 30° is not a narrow, empirically derived window — it is a loose upper bound that reads on a broader range than the art already identified as problematic. In re Woodruff/In re Peterson territory: overlapping or adjacent ranges, disclosed without criticality, are obvious.

The patent owner's best counterarguments, and why they are weak:

• "The 30° cut-off is critical to the 66% reduction." — No nexus. The 66% figure is measured against a no-selector baseline, not against the closest prior-art combination, and the patent never varies the threshold. Absent comparative data tied to the claimed range, the KSR "predictable variation" analysis is not rebutted. (Also note the internal oddity in the specification: the 66% figure is attributed to the third selector and a "only about 55%" stray-light figure for outside the image — the numbers are not accompanied by any methodology, which makes them poor evidence of criticality.)
• "Philips is a photometer — non-analogous art." — Fails. Analogous art is measured by field-of-the-inventor and problem-confrontee. In re Bigio, 381 F.3d 1320 (Fed. Cir. 2004); In re Clay, 966 F.2d 656 (Fed. Cir. 1992). The Philips element is an interference filter with angular selectivity — the same class of structure the patent's own claims and spec describe ("optical films formed by stacking high and low refractive indexes") — and it is reasonably pertinent to the projector's problem (exclude light outside an acceptance angle). That the surrounding apparatus is a light sensor rather than a projector does not make the filter non-analogous to the filter claimed. Where a reference is relied on for a discrete known element and its known function, the analogous-arts challenge is especially hard to sustain.
• "The art reduces angle by other means" (e.g., CN210403049U's micro-collimating arrays; the patent's Background's admission that a reflective cover/micro-optical array "can only be reduced by 20 degrees"). — This is not a teaching away. Criticizing the incompleteness of one known solution while the art simultaneously supplies a second, complementary known solution is the definition of a design incentive, not a lead away from it. And CN210403049U's own claim 3 collimates for the same purpose the patent's selector serves — same problem, compatible means.
• "Objective indicia." — None appears in the record: no evidence of licensing, copying, industry praise, failed attempts by others, or a nexus between any commercial Coretronic/Optoma engine and the claimed arrangement. And as the earlier sections found, the patent has never been asserted and never been challenged, so there is no adjudicated validity to lean on either way.

Secondary, related vulnerability (flag, not develop): the <30° / ≥30° split is also a § 112(a) written-description exposure — the embodiment text gives the 30° figure as a definition ("transmits light whose incident angle is less than 30 degrees (<30°) to pass through it and reflects light whose incident angle is 30 degrees or more (≥30°)") with no disclosed range and no criticality support. If a challenger wants a § 112 fallback in the IPR, that is the hook.

9. Consolidated claim-by-claim verdict

10. Recommended primary rejection and the fallback

Primary: a single § 103 rejection over CN210403049U in view of US 2011/0013179 A1, covering claims 1–4, 7, 9, 10, 11, 12. This is the cleanest challenge because every element of the base combination is in one reference, and the only gap is filled by a reference that uses the same structural tool (an angle-dependent dichroic interference filter) for the same purpose (blocking out-of-acceptance-angle light).

Add US 7,020,379 B2 as a third reference to supply (i) the express statement of the problem — X-cube performance collapses past ~11–12° — which is the strongest available motivation, (ii) the numeric-angle bracket against which 30° is an obvious design choice, and (iii) the on-face/directly-formed alternative that defeats claims 6 and 14.
Add US 7,330,314 B1 as corroboration for the "poor dichroic response at higher incident angles → incidence at reduced angles" reasoning. Add US 2008/0094576 A1 for claims 5, 13, 8, 15.

Where I would expect the patent owner to fight: the 30° figure (criticality/nexus) and the analogous-art objection to the Philips photometer reference. Both are answerable, but both should be briefed affirmatively rather than conceded — KSR's "ordinary creativity" rationale is the answer to the second, and the absence of any comparative data across thresholds is the answer to the first.

Material weakness to acknowledge: if a defendant's only art is the examiner's original 23-reference set, the challenge is materially weaker — that set's closest member (CN210403049U) misses the selector, and the only selector-style reference in it (US 2011/0013179 A1) is a photometer with no projector architecture. The strongest case requires US 7,020,379 B2, which the examiner does not appear to have had before him — a point that also helps on § 325(d) (no "same art or arguments previously presented" defense for the patent owner).