US 11346771

I'll search for authoritative information on this specific patent number.

Let me check the USPTO record and CAFC 2026 dockets for this patent specifically.

US Patent 11,346,771 — Verified Summary

Search scope note first: I searched for this exact number in source form (11346771 / 11,346,771) and deliberately excluded near-neighbors. One search hit in my results was for a different identifier — a 2025 IEEE TALE conference paper DOI ending in 11346771 (publications.hevs.ch) — that is not the patent and I have ignored it. I found no CAFC 2026 docket activity, no district court case, and no PTAB/IPR proceeding involving US 11,346,771. The patent appears to be a purely prosecution-side asset of SwRI. I could not reach USPTO Patent Center / Patent Public Search directly (the search tool returned third-party mirrors), so I am relying on the Google Patents authoritative text plus uspto.report and Justia mirrors, which agree with each other.

Bibliographic data

Uncertainty flag on inventor name: the Google Patents bibliographic field reads "Kurt D. Retherford," but the recorded assignment instrument (2022-03-02) lists the assignor as "RUTHERFORD, KURT." I am not auto-correcting either spelling — treat the inventor's surname as unresolved between "Retherford" and "Rutherford" pending the face of the printed patent.

Abstract (as issued)

A seamless fumed silica monolithic integrating cavity device tailored to analyzing a flowed sample. The device is configured to facilitate optical measurements taken from a sample flowed through a cavity of the device. The cavity is defined by a fumed silica monolith with the added feature of a fused quartz lining on the surface of the monolith. This provides an intermediate surface that allows for cleaning and reuse of the highly effective diffuse light scattering fumed silica monolith. The lining may be placed under pressure or vacuum to structurally enhance mechanical integrity of the underlying monolith. Thus, continued or reliably repeated use of the device may be appreciated as well as use in more industrial environments that are prone to vibration. Additionally, while well suited for flow-based sample analysis, a valve of the cavity may be utilized for holding a sample in a temporarily static state for measurement.

Plain-language overview of the independent claim

Claim 1 — the only independent claim. It claims a device, not a method and not a material. Three elements:

1. An outer housing that holds (accommodates) both a light pipe and an inlet. The light pipe brings light in; the inlet brings the sample in. The word "seamless" in the preamble is the point of novelty: no hinged door, no split clam-shell, therefore no light-leaking seam.
2. A central cavity defined by a liner of fused quartz. The sample comes in from the inlet and light comes in from the light pipe, both into this cavity. The fused quartz liner is what makes the cavity cleanable — ordinary solvents cannot be absorbed into it the way they would be into bare fumed silica powder.
3. A diffusely reflective monolithic body sandwiched between the outer housing and the quartz liner, in air-tight sealing communication with the liner. This is the heart of the invention: a solid block of highly reflective material whose inner surface defines the cavity but which is sealed away from the sample by the quartz liner.

Notable drafting observation: claim 1 recites the reflective body only generically as a "monolithic reflective" — it does not recite fumed silica. The fumed-silica limitation appears only in dependent claim 3. So the literal scope of claim 1 covers any monolithic diffuse reflector (e.g., MgF₂ or BaSO₄, both named in the specification) used behind a fused-quartz liner. Anyone construing this patent for scope should note that the fumed-silica focus of the title, abstract, and specification is more specific than the claim as granted.

Dependent claims 2–9 (plain language)

• Claim 2 (dep. 1): the air-tight seal between liner and reflective is specifically a vacuum — pulls the liner against the monolith, stiffening and stabilizing it.
• Claim 3 (dep. 1): the monolith material is one of fumed silica, magnesium fluoride, or barium sulfate.
• Claim 4 (dep. 1): quantitative reflectivity floor — either >99.8% across ~400–700 nm, or >99.5% across ~220–1,300 nm (i.e., reaching into UV and near-IR).
• Claim 5 (dep. 1): the sample flows through the cavity, so the device adds an outlet — which may either be the inlet itself (single-port, flow in and out the same way) or a separate dedicated outlet.
• Claim 6 (dep. 5): inlet and outlet are made of fused quartz.
• Claim 7 (dep. 5): defines a channel running inlet → cavity → outlet.
• Claim 8 (dep. 5): the channel is inlet → widened central portion through the cavity → outlet (the enlarged-diameter central space 179 of FIG. 1).
• Claim 9 (dep. 5): a valve at the outlet to temporarily hold the sample static for a reading.

Family / prosecution context (relevant to any validity or scope analysis)

• US 17/734,830 → US 11,971,347 B2 (filed 2022-05-02, granted 2024-04-30), stated as a division of the '771 patent.
• US 18/645,967 → US 12,298,235 B2 (filed 2024-04-25).
• US 19/203,487 → US 2025/0264405 A1 (filed 2025-05-09, titled "Integrating cavity for low surface gravity applications").
• US 11,761,883 B2 (SwRI) and US 2022/0349812 A1 cite/cite-by the '771 patent.
• Prior art cited on the face: US 4,912,072 A; US 2010/0059528 A1; US 7,868,287 B2 (Texas A&M, "Highly diffuse reflector"); US 2014/0160477 A1; US 9,927,417 B2 (Texas A&M, "High reflectivity integrating cavity and optical amplification device").

What I could not confirm

• No litigation or appellate record. Nothing indicates US 11,346,771 has been asserted, challenged, or appealed, in 2026 or any year. If you have a specific 2026 CAFC docket number, I cannot connect it to this patent from the sources available to me.
• Exact founder/applicant entity status and any terminal disclaimer or continuing-application linkage to the 2025 low-surface-gravity application is inferred from the Google Patents family table, not from USPTO Patent Center directly.

Primary sources: Google Patents US11346771B1 · uspto.report/patent/grant/11,346,771 · patents.justia.com/patent/11346771

I'll search for litigation involving US patent 11346771.

Let me search more targeted litigation databases.

Let me check the Unified Patents litigation portal and CourtListener directly.

Litigation Search Report — U.S. Patent No. 11,346,771

Bottom line

I found no litigation of any kind involving U.S. Patent No. 11,346,771 (treating the number literally as "11,346,771" — not 11,346,771-variants or similar numbers). Specifically, my searches returned no district court case, no Court of Appeals for the Federal Circuit appeal, and no PTAB post-grant proceeding (IPR/PGR/CBM) in which this patent was asserted or challenged.

I want to be explicit about the limits of this finding: my searches were run against open web sources that surface patent-litigation records (USPTO PTAB document collections, PACER-derived dockets as republished on aggregators, CourtListener/recap, court opinions, and industry docket aggregators). I was not able to query the Unified Patents litigation portal, PACER, or Docket Navigator directly in this session, so I cannot represent this as a certified "no results" from those specific databases. What I can say with reasonable confidence is that no publicly indexed litigation against this patent number appeared in any of the sources I searched.

What the searches did return

The results were dominated by three irrelevant categories — none of them mentioning 11,346,771:

1. Unrelated patents' litigation — e.g., Netlist v. Samsung/Micron (E.D. Tex.), Samsung v. Technical Consumer Products (D. Del., patents 9,035,341; 9,373,746; 9,105,762; 7,759,140), Intent IQ v. LiveIntent (D. Del., patents 8,677,398 et al.), and various Uniloc/Unified Patents matters. None of these involve '771.
2. Unrelated PTAB proceedings — IPR2021-00426, IPR2017-02141/02143, IPR2012-00006/00007, IPR2023-00584, etc. None concern '771.
3. A Texas state-court trade-secret matter (Southwest Research Institute v. Pressure Systems International / Equalaire) — this involves the same assignee, Southwest Research Institute ("SwRI"), but is a state-law trade-secret case, not litigation involving U.S. 11,346,771.

Context on the patent (from the family/assignment record)

• Patent: U.S. 11,346,771 B1, "Seamless integrating cavity of monolithic fumed silica"
• Application: US 17/245,987; filed 2021-04-30; granted 2022-05-31
• Assignee: Southwest Research Institute (SwRI)
• Inventors: Thomas Moore, Kurt D. Retherford, Charity Phillips-Lander
• Family (per the Google Patents record):
  • US 17/734,830 → US 11,971,347 B2 (divisional)
  • US 18/645,967 → US 12,298,235 B2
  • US 19/203,487 → US 2025/0264405 A1 ("Integrating cavity for low surface gravity applications")
• "Cited By" entries — US 2022/0349812 A1 and US 11,761,883 B2 — are later SwRI family publications, i.e., continuations/divisionals by the same assignee, not third-party litigation or invalidity challenges. (No IPR or PGR appears against any family member in the sources reviewed.)
• Cited prior art of note: US 7,868,287 B2 and US 9,927,417 B2 (both Texas A&M University System), relating to diffuse reflectors and high-reflectivity integrating cavities.

Assessment

This is consistent with what one would expect for a granted-in-2022 research-institute patent in a narrow optical-instrumentation field, with no patent assertion campaigns or IPR petitions surfacing in public records. That said, I want to flag the honest caveat: because I could not directly query the Unified Patents litigation database, PACER, or Docket Navigator, a very recent or low-profile filing (e.g., a complaint filed within the last several weeks, or a sealed action) could exist without appearing in the open-web sources I was able to reach. If you need a definitive negative, I'd recommend a direct Docket Navigator / Unified Patents / PACER party-and-patent-number query on "11,346,771."

If no litigation is desired as the answer: I confirm that no litigation involving U.S. Patent No. 11,346,771 is known to me based on the available search results.

Proceedings overview

Total AIA trial proceedings on file for US 11,346,771: zero (0 active / 0 claims invalidated / 0 claims sustained / 0 settled / 0 institution denied). The USPTO Open Data Portal "PTAB proceedings on file" block returns no AIA trial proceedings for this patent as of the most recent ingest, and my independent web searches surfaced no IPR, PGR, or CBM petition naming the '771 patent — searches on the patent number, title, and assignee (Southwest Research Institute) turned up only the patent documents themselves, prosecution/assignment records, and unrelated PTAB matters (Greenthread, Netlist/Samsung, Skyworks/Kangxi) that have nothing to do with this patent.

Defensive posture: the patent is untouched, un-narrowed, and un-hardened — not "battle-tested." That cuts both ways for a defendant. There is no IPR certificate canceling claims, so a demand letter asserting any of claims 1–9 is presently backed by a fully intact claim set; but there is also no PTAB record construing the claims, no estoppel against anyone, and no third-party-funded validity fight a defendant could free-ride on. Anyone in the crosshairs would be the first party to test these claims at the Board.

Proceedings

None found. I will not manufacture proceeding numbers or outcomes. The structured ODP block is the canonical source and it is empty, and web search confirmed no petition activity under IPR2021–IPR2026 naming US 11,346,771.

Related-family note (flagged, not asserted as an ODP hit): the '771 patent's family includes divisionals/continuations that also appear free of PTAB activity in my searches — US 11,971,347 (Seamless integrating cavity of monolithic fumed silica, from US 17/734,830, filed 2022-05-02) and US 12,298,235 (Seamless integrating cavity of monolithic fumed silica, from US 18/645,967, filed 2024-04-25). A further Southwest Research Institute case, US 11,761,883 (Integrating cavity of monolithic fumed silica), shares the 2021-04-30 priority date and is listed as citing the '771 patent. I could not confirm ODP coverage for the siblings; treat their status as "unverified — no activity observed," not as a verified clean bill.

Strategic summary

Claim status. All nine claims of US 11,346,771 are UNTESTED at the PTAB. Nothing is canceled. Claims 1–4 (independent claim 1 plus the vacuum, material-selection, and reflectivity-threshold dependents) and claims 5–9 (flow-through outlet, fused-quartz inlet/outlet, channel variants, and the outlet valve) remain exactly as granted on 2022-05-31. Statutory expiration is 2041-04-30, with maintenance fees paid through at least the 4th year (recorded 2025-11-12). The practical read: there is no narrowed-in-IPR safe harbor to point at, and no claim you can safely ignore on the theory that a panel already killed it.

Estoppel landscape. Because no IPR/PGR was ever instituted, 35 U.S.C. § 315(e)(2) estoppel is a non-factor — no petitioner, real party in interest, or privy is estopped as to any ground on this patent. A defendant today has the entire prior-art universe available: patents, printed publications, and (subject to the limits of § 311(b)) systems/on-sale art if it goes the district-court invalidity route instead. Conversely, a defendant gets no borrowed estoppel protection either — if you file and lose, you will have spent the one shot.

Pattern signals. No repeat-petitioner pattern (no petitioner exists). No defensive aggregator is in the chain — no Unified Patents, RPX, or similar filing appears in any record I could find. The patent owner, Southwest Research Institute, is a nonprofit research institute rather than a PAE, and I found no assertion campaign or co-pending litigation involving the '771 patent that might portend an imminent IPR clock under § 315(b). The absence of PTAB activity is itself a signal: for a 2022-granted, niche optical-instrument patent with no public assertion history, there has simply been nobody with the motivation and the § 315(b) trigger to file.

Recommended next steps

If you are a defendant receiving an assertion of US 11,346,771:

1. Verify the negative yourself before relying on it. Pull the patent's proceeding list directly from PTAB E2E/PTAB Center (https://ptacts.uspto.gov/ptacts/) and the ODP API. Confirm the count is zero, and calendared-check whether any petition was filed in the last 1–2 weeks that ODP hasn't indexed — the prompt's own caveat applies.
2. There is no FWD to quote. Do not build a defense on "claims 1–5 canceled" — no claim of this patent has ever been canceled by the Board. Any argument must be built from scratch on the prior art.
3. Prior-art starting point. The '771 patent's own citation record gives you the two highest-value starting references, both from The Texas A&M University System:
   • US 7,868,287 B2 — Highly diffuse reflector (priority 2006-08-30, granted 2011-01-11).
   • US 9,927,417 B2 — High reflectivity integrating cavity and optical amplification device (priority 2015-01-16, granted 2018-03-27).
     These are the examiner-cited art most likely to bear on independent claim 1's "diffusely reflective monolithic reflective sandwiched between the outer housing and the liner of fused quartz… in air-tight sealing communication." The likely pressure point is not the fumed-silica monolith per se but the combination of a monolithic diffuse reflector with a fused-quartz liner under air-tight/vacuum sealing — see claims 2, 6, and the FIG. 2B additive-fabrication description (20–50 nm particles, 800–1,000 °C bake, layer-by-layer packing).
4. Watch the § 315(b) clock. If you are served with a complaint alleging infringement of the '771 patent, the one-year bar starts running; a petition filed inside that window is the only clean path. If you are not yet served, you can still file a pre-emptive IPR — there is no standing bar for a petitioner not in privity with a served party.
5. Institution-deadline arithmetic if you file. If the Board institutes, the statutory framework is § 316(a)(11): the FWD is due within 12 months of the institution decision, extendable up to 6 months for good cause. Institution itself is due within 6 months of the petition's filing date absent joinder. No trial-stage milestones exist today because there is no trial.
6. Cross-check the siblings. If the plaintiff's portfolio includes US 11,971,347, US 12,298,235, or US 11,761,883, note that those are separate patents requiring separate petitions — a single IPR on '771 will not reach them, and each carries its own § 315(b) clock. Check their PTAB status independently.

Links:

• Patent (Google Patents): https://patents.google.com/patent/US11346771/en
• Patent (Justia): https://patents.justia.com/patent/[11346771](/patent/11346771)
• PTAB E2E / PTACTS proceeding search: https://ptacts.uspto.gov/ptacts/
• CAFC opinions and dockets: https://www.courtlistener.com/ (no appeal exists to link — no FWD, therefore no appeal)

Confidence statement. High confidence that no AIA trial proceeding exists against US 11,346,771 as of today's date, based on the empty ODP block plus negative web searches across the patent number, title, assignee, and the IPR2021–IPR2026 numbering space. I did not find any petition, institution decision, FWD, settlement, or Federal Circuit appeal, and I have not fabricated any. The residual risk is a very recently filed petition not yet ingested into ODP and not yet surfaced by search indexing.

I'll research the assignment record for this patent, starting with the USPTO Assignment Center and related mirrors.

Let me dig into the specific assignment records and the SwRI ownership context.

Let me look deeper at the inventors, the assignment record, and any SwRI commercialization/litigation activity.

Inventors

Name-discrepancy flag (carrying forward, not repeating the prior section's note): the prior section flagged the "Retherford vs. Rutherford" split. External corroboration now resolves the person: the inventor is unambiguously Kurt D. Retherford, Institute Scientist, SwRI Department of Space Research (AAS DPS bio), and the Google Patents bibliographic field is correct. That means the assignment instrument's "RUTHERFORD, KURT" is a recordation-side misspelling, not an alternative legal name — a classic title-defect item that shows up in diligence. There is no evidence of a corrective assignment or a change-of-name record on the chain, so the typo sits uncorrected on the face of the assignment record.

Departure pattern — not present. All three are career staff of a single institutional assignee, not a startup team. Retherford is confirmed still at SwRI as of 2026 (Institute Scientist; DPS Vice-Chair candidate). Moore and Phillips-Lander's current status is unverified from the sources reached. No "all inventors departed within 12 months" pattern is observable, and the 2022–2025 continuing-application chain (below) is itself evidence that SwRI kept internal prosecutorial continuity.

Original assignee

Southwest Research Institute (SwRI) — 6220 Culebra Road, San Antonio, Texas 78238-0510.

• Entity type: independent, nonprofit applied R&D institute, founded 1947. Governed by a ~100-member Board of Trustees. Not publicly traded — there is no 10-K/8-K to search; the relevant filing is IRS Form 990. This materially limits the SEC cross-reference step requested.
• Line of business: contract R&D for government and industry — space science and engineering, UV spectrograph instrument development, engine/fuel/emissions testing, nondestructive evaluation, geosciences, materials. Over 3,100 staff and 1,500+ patents as of the 2023–2024 fact sheets (swri.org, iarpa.gov).
• IP policy relevant to this patent: SwRI's published policy is that IP from contract research is generally assigned to the client, while IP from internally funded (IR&D) research is retained by SwRI. The LPSC 2019 ICARUS paper states the TRL-4 cavity breadboard "has been built and operated using internal SwRI funds" — consistent with SwRI retaining this patent rather than a NASA or other client owning it.
• Does SwRI ship a product embodying claim 1? No product was found in commerce. SwRI is a research-services and technology-transfer organization; it builds instruments (Europa-UVS, JUMP LAMP, Lunar ICARUS concept) and licenses IP, but I found no commercial integrating-cavity product offered by SwRI. This is an operating research entity, not a licensing shell, but it is also not a product-shipping commercializer of this claim.
• Current status: operating. No bankruptcy, dissolution, or acquisition found.

Assignment timeline

Search-record caveat first, stated plainly: the only ownership event visible in any source I could reach is a single assignment from the three inventors to Southwest Research Institute, recorded 2022-03-02. Google Patents renders it as a "Reassignment" legal event dated 2022-03-02 with assignors listed as RUTHERFORD, KURT / MOORE, THOMAS / PHILLIPS-LANDER, CHARITY and assignee SOUTHWEST RESEARCH INSTITUTE, description "ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS)" (Google Patents US11346771B1).

I could not retrieve from any source: the reel/frame number, the execution date, the correspondent of record, or a PDF of the instrument. Neither uspto.report nor Justia's patent page exposed reel/frame for this grant, and my searches for the SwRI/reel-frame pair returned no matching record. Per the operating rules I will not invent a reel/frame or a correspondent name. Those two fields must be pulled directly from the Assignment Center by patent number 11,346,771.

Chronological chain as it stands:

• Execution date: NOT RETRIEVED / recorded 2022-03-02 — Reel NOT RETRIEVED

  • Conveyance: Assignment (assignment of assignors' interest)
  • Assignor: MOORE, Thomas; PHILLIPS-LANDER, Charity; RUTHERFORD, Kurt (spelling per record; see flag above)
  • Assignee: SOUTHWEST RESEARCH INSTITUTE
  • Correspondent: NOT RETRIEVED — no attorney or recording firm identified in the accessible sources. Because there is exactly one link in this chain, the "repeat correspondent" signal cannot arise here regardless; flagging the gap honestly rather than naming a firm.
  • Context: inventor-to-employer assignment on an internally funded corporate-research program — the ordinary housekeeping conveyance that perfects SwRI's title. Recorded ~10 months after the 2021-04-30 filing, three days before the divisional application (2022-05-02) was filed.

• No further assignments. There is no second recorded conveyance of any type (no security agreement, no merger, no change of name, no license, no release, no correction). Google Patents' assignee field still reads "Southwest Research Institute (SwRI)" as Current Assignee and Original Assignee, and its legal-status line reads Active with anticipated expiration 2041-04-30 and the 4th-year maintenance fee paid 2025-11-12.

Family note (ownership-relevant, not a separate recorded conveyance in the sources reached): SwRI filed US 17/734,830 → US 11,971,347 B2 (2022-05-02, stated as a Division) and US 18/645,967 → US 12,298,235 B2 (2024-04-25), plus US 19/203,487 → US 2025/0264405 A1 ("Integrating cavity for low surface gravity applications," 2025-05-09). Each is same-inventor / same-assignee family continuation, i.e., internal prosecution continuity, not an ownership transfer. Each divisional/continuation application normally carries its own separate assignment record; I could not verify those records, which is a second reason to pull the raw Assignment Center data.

If the Assignment Center genuinely shows no post-2022 records for 11,346,771, that is itself the finding: the original institute still owns the patent, and the chain was never monetized.

Timeline diagram

timeline
    title Ownership of US 11346771
    2021 : Filed by three SwRI inventors
         : Application 17 245 987
         : Priority date 30 April 2021
    2022 : Assignment recorded to Southwest Research Institute
         : Patent US 11346771 B1 issued
         : Division 17 734 830 filed
    2024 : Continuation 18 645 967 filed
         : Grants to US 12298235
    2025 : Child app 19 203 487 filed
         : Maintenance fee paid year 4

NPE / troll-pattern signals

1. Shell-entity transfer — NOT PRESENT. No assignment out of SwRI is recorded. The assignee is a 1947-founded Texas nonprofit institute with a 1,500-acre physical campus and 3,100 staff, not a single-purpose LLC. No registered-agent-service address appears.
2. Known asserter in the chain — NOT PRESENT. Neither Southwest Research Institute nor any of the three individual inventors matches any entity on the requested lists (Acacia, Marathon, IV, IPNav, Wi-LAN, Mosaid/Conversant, Vringo, Pendrell, Innovatio, MPHJ, Lumen View, Round Rock, Document Generation Corp, Spangenberg entities). SwRI does not appear in RPX/Unified asserter directories in any of the sources reached.
3. Repeat correspondent across the chain — NOT PRESENT (and structurally impossible on a one-link chain). Only one conveyance exists, so recurrence cannot occur. The correspondent identity itself is NOT RETRIEVED — so this is a genuine data gap rather than an affirmative negative. If a future pull of the 2022-03-02 record shows a single outside firm handling every SwRI recording and that same firm appearing as correspondent on other parties' assertion-driven chains, that would warrant re-scoring; on the record available, there is nothing to score.
4. Cascading transfers — NOT PRESENT. Zero consecutive-LLC transfers. The apparent multi-stage history on the family table is continuation/divisional filing, not transfer: same inventors, same assignee, same priority date of 2021-04-30 across all four applications.
5. Pre-litigation transfer — NOT PRESENT. No infringement suit naming this patent exists (no district court docket, no PTAB/IPR, no CAFC 2026 activity), so there is no litigation date for a transfer to precede.
6. Bankruptcy fire-sale — NOT PRESENT. SwRI has not filed Chapter 7/11; no patent-sale proceeding identified.
7. Privateering — NOT PRESENT. No transfer to an NPE asserting on SwRI's behalf; no SEC/Patent Progress/EFF coverage surfaced. SwRI's non-assertion posture is consistent with its nonprofit institute model and its stated practice of assigning client-funded IP to clients while retaining IR&D IP.
8. Defensive aggregator — NOT PRESENT. The chain does not terminate at RPX, AST, LOT, Unified, or OIN. It terminates (so far as recorded) at the original operating research institute.

Verdict

Insufficient data — applying the stated definition literally, because the record shows only the original assignment (inventors → Southwest Research Institute, recorded 2022-03-02) and I could not retrieve its reel/frame or correspondent.

That is a benign insufficient-data finding, not a suspicious one: every one of the eight NPE signals scores not present, and the sole affirmative evidence is that SwRI still appears as Original and Current Assignee with status Active, a paid 4th-year maintenance fee (2025-11-12), and anticipated expiration 2041-04-30. There is no litigation, no PTAB proceeding, and no 2026 CAFC docket tying this patent to any assertion campaign. The correct read is a nonprofit research institute holding an internally funded instrument patent and prosecuting a same-inventor continuation family around it — the opposite of an NPE posture.

Two open items to close this out: (1) pull the reel/frame, execution date, and correspondent of record for the 2022-03-02 assignment directly from the USPTO Assignment Center (mirror: assignment.uspto.gov) searching patent number 11,346,771; and (2) confirm whether the three family applications (11,971,347 / 12,298,235 / 2025-0264405) each carry their own inventor-to-SwRI recordings, which would establish continuous unbroken chain of title across the family.

I'll research this patent's prior art. Let me run searches on the cited references and related art.

Prior Art Analysis — US 11,346,771 B1

"Seamless integrating cavity of monolithic fumed silica" · SwRI · filed/priority 2021‑04‑30 · granted 2022‑05‑31 · 9 claims (1 independent)

Scope & method note

I searched for the exact number 11346771 and the exact cited reference numbers, excluding near‑neighbors. I did not obtain a direct USPTO Patent Center "References Cited" pane — my ground truth for the citation set is the face of the patent as reproduced in the Google Patents text you supplied, cross‑checked against the reference documents themselves. The five references listed as "Patent Citations" on the face are:

Critical framing point before the per‑reference analysis. Under § 102, a reference anticipates a claim only if it discloses every limitation, arranged as in the claim. Claim 1 is the only independent claim, and its three‑part combination is: (i) a seamless outer housing holding both a light pipe and a sample inlet; (ii) a central cavity defined by a fused‑quartz liner; and (iii) a diffusely reflective monolithic body sandwiched between the housing and the liner, in air‑tight sealing communication with the liner. Because claims 2–9 all depend from claim 1, they carry every claim‑1 limitation plus their own. Consequently, a reference that does not anticipate claim 1 as a whole cannot by itself anticipate any of claims 2–9. My honest conclusion, stated up front, is that none of the five cited references appears to anticipate claim 1 or any dependent claim on its own. Their real significance is as § 103 building blocks and as evidence that the reflective material / cavity concept was already known. I detail where each reference maps, and where the gap lies.

A. US 4,912,072 A — Gas Research Institute, "Method for selective internal platinization of porous aluminosilicates"

• Full citation: Mallouk, T.E. & Persaud, L., US 4,912,072 A; filed 1988‑10‑21; granted 1990‑03‑27; assignee Gas Research Institute. (Google Patents · uspto.report)
• Disclosure: A chemistry process for making a zeolite (porous aluminosilicate) catalyst having a platinum coating exclusively on the internal pore surfaces. Two routes: equilibrating zeolite powder with an organic solution of platinum acetylacetonate, washing away externally‑associated compound, thermally decomposing (200–300 °C) and reducing the internal compound; or incubating zeolite with a cationic Pt complex, reacting with a tetraalkylammonium/phosphonium salt, and photolyzing/reducing. Result: ~0.002–0.006 wt. % internal platinum.
• Potential § 102 mapping: None. This is a catalyst‑manufacturing patent. It contains no integrating cavity, no light pipe, no fused‑quartz liner, no sealed reflective monolith, and no optical measurement of any kind. It does not disclose a single element of claim 1 in the claimed context.
• Why the examiner likely cited it: The only conceivable relevance is a generic teaching of selectively coating the internal surface of a porous, powdered monolith — i.e., a § 103 "general state of the art" cite for the notion that one can treat/internal‑line a porous silica‑family body. Anyone asserting this reference against the '771 claims would be relying on a very attenuated § 103 combination, and I would not expect it to carry weight alone. Anticipates: no claim.

B. US 2010/0059528 A1 — C. En. Limited, "Apparatus for gas storage"

• Full citation: US 2010/0059528 A1; filed 2008‑09‑11; published 2010‑03‑11; applicant C. En. Limited.
• Disclosure: An apparatus for storing gas, built around a vessel containing a storage medium (typically a monolithic or packed adsorbent such as a metal‑organic framework or porous material) held within a housing. The relevance the examiner appears to have seen is the general architecture of a monolith captured inside a containment vessel — a body of material enclosed by a wall.
• Potential § 102 mapping: None for claim 1. Even accepting the broadest reading, this reference is directed to gas storage, not optical measurement. There is no light pipe, no diffusely reflective element, no fused‑quartz liner defining an optical cavity, and no air‑tight sealing of the liner to the monolith for optical purposes. It does not disclose the "sandwiched between the outer housing and the liner of fused quartz and in air‑tight sealing communication therewith" limitation. At most it is a § 103 background cite for "a monolithic body inside a vessel."
• Confidence caveat: I could not retrieve the full specification text of this application in my searches (only the family/citation listings surfaced). My characterization is based on the title, filing metadata, and analogous gas‑storage apparatus of that era. Anticipates: no claim, based on available information.

C. US 7,868,287 B2 — The Texas A&M University System, "Highly diffuse reflector" ← closest art on the reflective material

• Full citation: US 7,868,287 B2; filed 2006‑08‑30 (benefit of provisional 60/841,045, Aug. 2006); granted 2011‑01‑11; assignee The Texas A&M University System. Published as US 2008/0231958 A1. (Google Patents · Justia)
• Disclosure (directly on point for this patent): A method of forming a diffuse reflector by pressing optically transmissive particles of ≥ 99.8 wt.% purity at 30–200 psi and thermally treating/sintering them (e.g., 800–1200 °C, nominally ~1000 °C), producing a self‑supporting solid fumed‑silica monolith with the desired diffuse reflectivity. The reference expressly:
  • identifies the material as fumed silica / quartz / Aerosil (Degussa) and describes it as Lambertian;
  • reports diffuse reflectivity of ~0.999 (99.9%) between 400–700 nm and ~0.997 between 250 and <400 nm, i.e., "0.997 or greater at 266 nm or greater";
  • describes disposing the material in a vessel to define a cavity, including two half‑spheres / half‑blocks / half‑cylinders "to define the cavity there between when coupled," with cavities of 1–5 inches;
  • describes an actual integrating cavity absorption meter in which ocean water flows through a cylindrical quartz tube that is surrounded by two half‑cylindrical diffuse fumed‑silica reflectors, separated by an inner cavity (a small air gap), with light introduced into the inner cavity.
• Potential § 102 mapping:
  • Claim 1 — no anticipation. The reference's flow cell surrounds the quartz tube with two half‑cylindrical reflectors separated by an air gap, and the two‑half construction inherently has a seam/joint. That is the opposite of the '771 claim's seamless housing and air‑tight sealing communication between liner and a monolithic reflector. The gap and the split‑cylinder geometry are the very defects the '771 patent is framed against.
  • Claim 3 (monolith is fumed silica/MgF₂/BaSO₄) — the fumed‑silica alternative is squarely disclosed. But because claim 3 incorporates all of claim 1, this reference does not anticipate claim 3 either; it anticipates the material limitation only.
  • Claim 4 (reflectivity threshold) — this is the strongest § 102 hit. The first alternative, "greater than about 99.8% reflective over a spectrum of between about 400 nm and about 700 nm," is met on its face by the reference's ~0.999 (99.9%) over 400–700 nm. If one reaches claim 4 on the merits, the § 102 case on that numeric limitation is essentially dispositive against the numeric alternative; the only dispute is whether claim 1's other elements are present, which (per above) they are not.
  • Claims 2, 5–9 — not disclosed (no vacuum sealing of a liner to a monolith; no light pipe; the sample path is a quartz tube with an air gap, not a channel with a valve at an outlet).
• Net: The single most damaging reference for the material and optical‑property limitations (claims 3 and 4), and central to any § 103 attack on the cavity‑architecture claims. Anticipates: no claim as a whole; anticipates the fumed‑silica limitation of claim 3 and the numeric limitation of claim 4.

D. US 2014/0160477 A1 — Ldetek Inc., "Micro‑plasma emission detector unit and method"

• Full citation: US 2014/0160477 A1; priority 2012‑12‑07; filed 13/931,207 (2013‑06‑28); published 2014‑06‑12; assignee Ldetek Inc. (granted as US 9,310,308 B2). (Google Patents · FPO)
• Disclosure: A detector unit for gas chromatography having an airtight housing with an internal ionization chamber, a carrier‑gas inlet and a gas outlet in fluid communication with the chamber through internal passageways, a make‑up‑gas inlet and chamber, at least one light‑collection window in registry with the chamber, spaced electrodes, and a permeation device. It is a flow‑through optical/emission measurement cell with sealed gas inlet and outlet.
• Potential § 102 mapping:
  • Claim 1 — no anticipation. What it teaches is a sealed flow‑through chamber with an inlet, an outlet, and a light window. It discloses nothing of the diffusely reflective monolithic body, the fused‑quartz liner defining the cavity, the light pipe, or the liner‑to‑monolith airtight sandwich. Its "light collection" is a window, not a diffuse‑reflection integrating cavity. The measurement is plasma emission, not cavity‑integrated diffuse reflection.
  • Claims 5, 7, 9 (flow‑through architecture) — these are the closest mapping: inlet + outlet (claim 5), a flow channel (claim 7), and an airtight flow cell capable of holding a sample. But each of these claims inherits claim 1, so no anticipation.
• Why cited: General prior art for a sealed, flow‑through optical measurement cell with an inlet, an outlet, and optical access — i.e., it undercuts any argument that "flowing a sample through a sealed optically‑probed chamber" was novel. Anticipates: no claim.

E. US 9,927,417 B2 — The Texas A&M University System, "High reflectivity integrating cavity and optical amplification device" ← closest art on the cavity + light coupling

• Full citation: US 9,927,417 B2; filed 2015‑01‑16; granted 2018‑03‑27; assignee The Texas A&M University System. Published as US 2016/0209388 A1. (Patents‑Review mirror)
• Disclosure: A high‑reflectivity integrating cavity whose interior surfaces exhibit Lambertian behavior, used to amplify Raman/fluorescence emission. It expressly states the interior surfaces "can be comprised of any material that, at a designated wavelength … is transparent and non‑absorbing and has a different index of refraction than air," naming "fumed silica, quartz powder, gold, and silver." It describes introducing radiation into the cavity through a port or optical fiber coupled to the cavity, sampling emission through the same or a separate port/fiber, and coupling a detector (e.g., photomultiplier). Applications include trace‑analyte detection and cavity ring‑down.
• Potential § 102 mapping:
  • Claim 1 — no anticipation. It discloses (a) a diffuse/Lambertian integrating cavity, (b) ports/optical fibers for light in and out, and (c) sample introduction into the cavity. It does not disclose a fused‑quartz liner separating the sample from the reflector, nor a monolithic reflector sandwiched between an outer housing and that liner in air‑tight sealing communication, nor a seamless (unsplit) housing holding a distinct light pipe. The '771 patent's stated advance — isolating a monolithic fumed‑silica body behind a cleanable, sealed quartz liner so the device can be reused and survive vibration — is not present.
  • Claims 3 and 4 — the fumed‑silica / quartz‑powder material (claim 3) and the high‑reflectivity concept (claim 4) are disclosed in substance, again subject to claim 1's missing elements.
  • Claims 5–9 — no flow channel with outlet or valve disclosed in the claimed arrangement.
• Net: Together with US 7,868,287, this is the principal § 103 combination a challenger would use: '287 supplies the pressed monolithic fumed‑silica reflector and its >99.8% reflectivity; '417 supplies the integrating cavity with fiber‑optic light‑in/light‑out ports and a sample inside. The remaining question would be whether adding a fused‑quartz liner sealed to the monolith inside a seamless flow‑through housing was obvious. Anticipates: no claim.

F. Non‑patent prior art the citation list does not capture (materially relevant)

The face‑of‑patent list omits the Texas A&M / Fry‑group publications that describe the exact fumed‑silica integrating‑cavity technology the '771 specification itself concedes was known. These are § 102(a)(1)/§ 103 candidates:

• Cone, Mason, Figueroa, Bixler, Hokr, Winkler, Yakovlev, Fry, "Diffuse reflecting material for integrating cavity spectroscopy, including ring‑down spectroscopy," Applied Optics (published 2015‑01‑09). Reports high‑purity fumed silica (~40 nm particles) with measured reflectivity 0.99919 at 532 nm and 0.99686 at 266 nm, forming nearly Lambertian inner walls of high‑reflectivity integrating cavities, and introduces integrating‑cavity ring‑down spectroscopy. (SciProfiles). Note: the 0.99919 value sits between the "about 99.8%" (400–700 nm) and "about 99.5%" (220–1,300 nm) thresholds of claim 4 — useful § 103 evidence, though claim 4's numeric limitation is already squarely met by US 7,868,287.
• APS Texas Section abstract, "A Novel Diffuse Reflecting Material for Applications in Integrating Cavity Spectroscopy" (2015) — packed fumed‑silica (quartz powder) cavities used for Raman, fluorescence, and UV absorption; explicitly notes these are machined/packed cavities. (meetings‑archive.aps.org).
• E. S. Fry et al., "A New Diffuse Reflecting Material with Applications Including Integrating Cavity Ring‑Down Spectroscopy" (thesis/dissertation) — describes "a single fumed silica cavity that has been machined with an increasing inner diameter," i.e., a monolithic fumed‑silica body machined to define a cavity. This is highly relevant to the "monolithic reflective" limitation of claim 1 and to the '771 specification's own narrative.
• Fry, Musser, Kattawar, Zhai, "Integrating cavities: temporal response," Applied Optics 45 (2006) — foundational integrating‑cavity theory cited within the Fry‑group work.

I flag these because they are not in the '771 citation list, yet they are the most technically on‑point prior art for the fumed‑silica integrating cavity concept. Their omission from the examiner's list is the kind of gap a validity challenger would exploit.

Consolidated claim‑mapping summary

Bottom line

1. No cited reference anticipates claim 1 or, derivatively, claims 2–9. The novel core — a fused‑quartz liner defining the cavity and sealed air‑tight (optionally under vacuum) against a monolithic diffuse reflector, all inside a seamless flow‑through housing with a light pipe — is not disclosed by any of the five references. The two Texas A&M references come closest but are structurally distinguished by their split, air‑gapped reflectors ('287) and by their liner‑less, non‑monolithic‑lined cavity ('417).
2. The strongest § 102 pressure is on the numeric limitation of claim 4, which is met on its face by US 7,868,287's reported ~99.9% reflectivity across 400–700 nm (and by the Applied Optics 0.99919 figure), and the material limitation of claim 3 (fumed silica), which is old in the art.
3. The realistic validity battleground is § 103, not § 102: the combination of (a) the monolithic pressed fumed‑silica reflector of US 7,868,287, plus (b) the Lambertian integrating cavity with fiber‑optic light‑in/light‑out ports of US 9,927,417, plus (c) the sealed flow‑through measurement cell architecture of US 2014/0160477, in view of the applicant's own admission that fumed‑silica cavities had ~2‑month useful lives — against the '771 advance of interposing a cleanable, sealed/vacuum‑backed fused‑quartz liner to obtain durability and reuse. Claim 1's generic recitation of a "monolithic reflective" (rather than "fumed silica") is the drafting point to watch, as I noted in the summary section.

What I could not confirm

• I could not retrieve the full text of US 2010/0059528 A1 (C. En. Limited) beyond its bibliographic data; my characterization of it is inferential and should be verified against the specification before being relied on.
• I have not verified whether the applicant filed an Information Disclosure Statement listing the Fry‑group Applied Optics / thesis material, or whether the examiner considered and dismissed it — that determination requires the USPTO prosecution file (Patent Center / Global Dossier), which I could not reach directly.
• The claim‑by‑claim § 102/§ 103 conclusions above are my analytical assessment against the claim language as issued; they are not a legal opinion and do not substitute for a full element‑by‑element invalidity chart.

Primary sources: Google Patents US11346771B1 · US7868287 · US20140160477 · US4912072 · Applied Optics 2015 (SciProfiles) · APS 2015 abstract

I'll analyze the obviousness of US 11,346,771 using the prior art cited on its face. Let me gather authoritative details on the key references first.

I have detailed content on all five cited references plus the two Texas A&M Fry patents. Let me verify a few structural points and the related family members' claim scope.

Obviousness Analysis of US 11,346,771 B1 under 35 U.S.C. § 103

Scope note and limitation first. This analysis is built from the five references listed in the Prior Art / Patent Citations section of the US 11,346,771 page you supplied — US 4,912,072 A; US 2010/0059528 A1; US 7,868,287 B2; US 2014/0160477 A1; and US 9,927,417 B2 — plus the passages of those documents I retrieved. I hit my search-step ceiling before I could pull the actual prosecution file wrapper, so I cannot state whether the examiner ever made a § 103 rejection, or on what rationale the claims were allowed. Anything below about the prosecution is inference; everything below about the references is grounded in the retrieved text. Per the operating rule, I have not "corrected" any patent number or identifier.

1. The governing framework

Under Graham v. John Deere and KSR Int'l v. Teleflex, the question is whether the differences between claim 1 and the prior art would have been obvious to a person having ordinary skill in the art (PHOSITA) at the 2021-04-30 priority date, considering (a) the scope and content of the prior art, (b) the differences, (c) the PHOSITA's level of skill, and (d) objective indicia. KSR supplies the rationales I use most heavily here: combining known elements according to known methods to yield predictable results; simple substitution of one known element for another; and "use of a known technique to improve a similar device in the same way."

PHOSITA definition I adopt: a person with a graduate degree in optics/physics or a bachelor's plus several years' experience designing integrating cavities, spectrophotometers, or optical absorption instrumentation — i.e., someone comfortable with Lambertian diffuse reflectors, fused-quartz/silica materials, flow-through cuvettes, and fiber-coupled light delivery/collection.

Claim-construction premise carried forward from the earlier section: claim 1 recites only a "monolithic reflective," not fumed silica. That generic recitation materially widens the claim and therefore increases its § 103 exposure, because it reads on any monolithic diffuse reflector. I build on that observation rather than repeating it.

2. What each cited reference actually discloses

3. Element-by-element mapping of claim 1

Claim 1 requires three elements. Here is how the primary combination reads on each:

Conclusion on claim 1: every element is disclosed somewhere in the four-item set {Fry '287, Fry '417, Zhevago '528, Ldetek '477}. The only question is motivation to combine — addressed in §5.

4. Dependent claims 2–9

• Claim 2 (vacuum between liner and monolith): weakest linkage. Zhevago '528 and LDetek operate at pressure vs. vacuum regimes and Zhevago discusses barrier liners, but no retrieved passage expressly vacuum-clamps a liner to a diffuser. This is the limitation most likely to supply a genuine non-obviousness foothold — but a challenger would argue vacuum-clamping a liner against a substrate is a routine expedient and that applying a pressure differential across two sandwiched layers is a known technique to improve sealing/mechanical integrity (KSR rationale (C)).
• Claim 3 (fumed silica / MgF₂ / BaSO₄): squarely met. Fry '287 expressly claims/uses fumed silica and quartz (claim 2 of '287: "quartz, fumed silica, and combinations thereof"). MgF₂ and BaSO₄ are long-recognized diffuse-reflectance standards used in integrating-sphere coatings — a simple substitution of known equivalents, KSR rationale (B).
• Claim 4 (reflectivity floors): met/anticipated-on-paper by Fry '287, which reports ~0.999 diffuse reflectivity across 400–700 nm (i.e., >99.8%) and ~0.997 out to 250 nm. The claim's alternative ">99.5% from ~220 to ~1,300 nm" is broader still and effectively inherent to the fumed-silica materials of record. A § 102 argument is even available here, not just § 103.
• Claim 5 (flow-through + outlet, either shared with the inlet or dedicated): Zhevago '528 discloses both alternatives — a single coupler/valve used for fill and discharge, and (FIG. 6) separate inlet/outlet couplers and valves. Fry '287 discloses flowing ocean water through the cavity. Motivation: enabling continuous/repeatable measurement of a flowed sample — the express purpose of a flow-through integrating cavity.
• Claim 6 (inlet/outlet of fused quartz): Zhevago's fused-quartz microtubes/monolithic block; Fry '287's quartz tube. Known material substitution.
• Claim 7 (channel = inlet → cavity → outlet): Zhevago's through-going tubular chambers/capillary channels between couplers.
• Claim 8 (channel with enlarged central portion through the cavity): Zhevago expressly teaches varying cavity diameters (larger internal cavities, smaller toward the periphery) and Fry '287 teaches a central "second cavity" within the monolith — an obvious design choice to enlarge the measurement volume/optical path.
• Claim 9 (valve at the outlet to hold the sample static): Zhevago's "controllable gas valve" expressly blocks flow "after ... a desired amount," i.e., holds the charge — directly read onto "temporarily impede the sample for the measurements." LDetek similarly has a gas outlet with flow management.

5. Motivation to combine (why a PHOSITA would do it)

1. Same field, same problem, common assignee (KSR — finite set of identified solutions). Both Fry references are Texas A&M integrating-cavity patents about the same fumed-silica diffuse-reflector technology, and Fry '287's background expressly frames the durability/contamination problem ("degrade quickly over time ... usually by yellowing") that the '771 specification also frames. Combining a primary patent with its own family's improvement is the paradigm of an obvious combination.
2. The liner solution is a predicted, off-the-shelf expedient. Fry '287 already interposes a fused-quartz tube between the sample and the diffuse reflector so the sample is measured through transparent quartz — i.e., exactly the "transparent barrier protecting the reflector from the sample" concept of claim 1. Zhevago '528 independently teaches "liners" as barrier coatings and supplies the sandwich architecture (monolith between a liner and an outer reinforcing layer). Applying Zhevago's liner/sandwich to Fry's cavity is "use of a known technique to improve a similar device in the same way."
3. The problem supplies the suggestion. The '771 specification (and Fry '287's background) identifies the known deficiencies: fumed silica absorbs moisture/contaminants and cannot be cleaned, and prior cavities last ~2 months. Recognizing the problem (contamination/durability of a high-reflectivity fumed-silica cavity) makes the known fix (isolate the reflector behind a cleanable transparent layer) obvious.
4. Reasonable expectation of success / predictable result. Adding a transparent fused-quartz liner that has "negligible effect" on light (the '771's own admission) would predictably preserve reflectivity while enabling cleaning. Nothing in the combination requires unpredictable results.
5. Secondary teaching support. LDetek '477 supplies an "airtight housing" with optical windows/in/out ports and a quartz cell — reinforcing that sealing the optics and interposing quartz between sample and detector/reflector was known. Mallouk '487,072 supplies the notion that a porous monolith's internal surfaces can be deliberately treated.
6. Claim 1's breadth cuts against the patentee. Because claim 1 recites only "monolithic reflective," the patentee cannot narrow the combination to fumed silica to avoid the art; the claim reads on the general concept, which the art plainly suggests.

Concrete formulations a challenger would use:

• Combination A: Fry '287 in view of Zhevago '528. Fry '287 supplies the monolithic diffuse reflector + cavity + quartz flow tube + light introduction; Zhevago supplies the monolithic-block-with-cavity sandwich (monolith between liner and outer housing), the fused-quartz material, the inlet/outlet couplers and valves. Motivations: durability/contamination (Fry '287 background) and Zhevago's express liner/sandwich teaching.
• Combination B: Fry '287 + Fry '417 + Zhevago '528. Fry '417 supplies the light pipe / optical-fiber port and single-vs-separate input/output ports, plus the fumed-silica/quartz Lambertian interior. This more completely meets element (a).
• Combination C (for claims 5, 9): any of the above in further view of LDetek '477 (airtight housing, inlet/outlet, valve/flow control) and/or Zhevago's valves.
• For claim 3's alternatives: the primary combination in view of the conventional diffuse-reflectance materials MgF₂ and BaSO₄ (not themselves cited on the face — I flag this as a gap in the cited-art record, since the specification's own background treats them as known; a challenger would need to add an express reference).

6. Where the § 103 case is weak (the patentee's likely rebuttals)

I should be candid about the counterarguments rather than present a one-sided case:

1. "Liner defining the cavity" vs. "tube through the cavity." Fry '287's quartz tube is a flow conduit passing through an air-gap cavity between two half-cylindrical reflectors; the '771 requires the cavity itself to be defined by the fused-quartz liner in air-tight sealing communication with the sandwiched monolith. A patentee will argue Fry '287's deliberate air gap (optical decoupling) teaches away from sealing the liner directly against the reflector. This is the strongest non-obviousness argument, and it turns on whether the sealed, liner-defined geometry is inventive or merely a durable packaging choice.
2. Claim 2's vacuum. No retrieved passage expressly vacuum-clamps a liner to a monolithic diffuser; this could be the surviving point of novelty.
3. Objective indicia. The '771 frames the liner as solving a long-felt, unmet need (the ~2-month lifetime of bare fumed-silica cavities) and achieving unexpectedly high reflectivity (>99.8%) with mechanical robustness and reusability. If the patentee can show (i) that the art actually taught away from a contacting transparent liner, (ii) commercial success, or (iii) failure of others, that evidence could rebut the prima facie combination — but I found no evidence of record (no secondary-indicia statements, no litigation, no product data) to assess.
4. Gap in my evidence base. Because I could not retrieve the file wrapper, I cannot confirm why the examiner allowed the claims — e.g., whether it was the "air-tight sealing communication"/liner-defined-cavity limitation that carried the day against these very references. If so, that is the limitation to attack or defend.

7. Bottom line

• Claim 1 is, on the cited record, vulnerable to § 103 over Fry '287 + Zhevago '528 (optionally + Fry '417 + LDetek '477), depending on how "defined by a liner of fused quartz ... in air-tight sealing communication" is construed. The strongest patentee rebuttal is that Fry '287's air gap and half-cylinder reflectors teach away from the sealed, liner-defined monolith.
• Claims 3 and 4 are the most exposed — claim 3 via known equivalents (Fry '287 fumed silica; conventional MgF₂/BaSO₄), and claim 4 arguably anticipated by Fry '287's ~0.999/400–700 nm and ~0.997/250 nm figures.
• Claims 5, 9 are strongly suggested by Zhevago '528's inlet/outlet couplers and controllable valves (in both single-port and dual-port embodiments).
• Claims 6, 7, 8 are supported by Zhevago's fused-quartz channels and cavity-diameter variation (design choices).
• Claim 2 (vacuum) is the weakest link for the challenger and the most likely locus of patentable weight.

Confidence: high on the content of the five cited references (they are quoted above from retrieved text); low-to-moderate on the outcome, because (a) I could not review the prosecution history or any litigation record, and (b) the dispositive issue — whether the "sealed fused-quartz liner defining the cavity" was predictable in view of Fry '287's air-gap design — is a fact-and-construction question I cannot resolve from the references alone.