US 2480178

I'll run the requested searches for patent number 2480178 as-is, covering both the USPTO record and any CAFC 2026 docket activity.

Search note (performed as instructed)

I searched USPTO-facing and CAFC-facing sources using the literal string 2480178. Results:

• USPTO / CAFC 2026 dockets: No CAFC 2026 docket activity referencing US 2,480,178 was found. This is expected: the patent's legal status is Expired – Lifetime with an anticipated expiration of 1966‑08‑30, per Google Patents' bibliographic record. A 2026 Federal Circuit appeal involving this patent would be extraordinarily unlikely, and none surfaced.
• Number-confusion traps (explicitly excluded, NOT this patent): EP2480178B1 (stent with toggle lock strut), FR2480178A1 (process for producing egg packaging), CA2480178A1 (Canadian application from WO03083043). These share only the numeric string and are unrelated art/entities. I have not merged them into the analysis below.
• The only substantive citations of this patent I found are as prior art: WO2007072340A3 (Philips, "Layered light guide for producing ambient lighting") cites US 2 480 178 A as an "X" reference against claims 1, 4‑6, 8, 9, 11, 14, 16‑20; and French application FR2948174A1 states that "the first to have described" beam decomposition by a light guide with deflectors was "ZINBERG IVAN H dans son brevet US2480178 (A) du 30 août 1949."

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US 2,480,178 — Bibliographic summary

Abstract: There is no formal abstract in the printed 1949 patent; patents of this era were not published with one. Google Patents' "Definitions" box is simply an extract of the specification's opening statement, which states the invention "relates to lighting devices for illuminating a television studio, a stage or motion picture set, a photographic shop, a store window or display or any similar location, and the individuals connected with same without subjecting such to the effects of heat when intense lighting is used."

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Plain-language overview

The patent discloses a "cold" high-intensity stage/studio lighting system. A DC arc lamp (zirconium-oxide cathode globule, argon-filled envelope) sits at the principal focus of a parabolic reflector, so light leaves the reflector as a parallel beam. That beam is injected edge-on into a flat, polished inlet face of a stack of transparent acrylic/"methacrylate" light-guide slabs, and is piped internally along each slab by total internal reflection (the spec says light can be piped around bends of radius ≥ 2× sheet thickness, or corners ≤ ~48°). At the far end, each slab terminates in an angled flat reflecting facet (the "riser") that redirects the piped light out through a curved trough-shaped exit depression (the "tread"), producing a stair-step/venetian-blind emitting surface. The stair-stepped surface is also claimed to be acoustically advantageous (it avoids a flat "sounding board"). Beam aiming is adjustable three ways: oscillating the guide about its long axis via pull cords, tilting the reflector, or raising/lowering lamp+reflector to cut off individual slab inlets. A slidable color/occlusion slide varies color and spot/flood character. The guide passing through the wall also acts as a barrier preventing heat transfer by conduction/convection into the lit space.

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Independent claims — plain-language overview

All eight claims read as independent; none incorporates a preceding claim by reference (no "as set forth in claim 1" language appears), which is characteristic of this era.

1. Flooding device (Claim 1). A low-heat, high-visible-output lamp + multiple transparent lens structures with light-receiving ends and interrupted light-emitting side portions, mounted to oscillate over a limited arc; an operating member is connected to one structure, and cords/lines connect to the rest so all can be swung to a desired position from a remote location.
2. Selective illumination means (Claim 2). Lamp with visible-spectrum output + reflector + lens structure with a flat polished face facing the lamp; the opposite face bears step reflecting surfaces at angles and distances from the polished surface, with depressions adjacent to and under the reflectors that receive the reflected light and emit it onto the target area.
3. Light-distributing device (Claim 3). A heating-cathode type bulb (high visible / low heat), a reflector that outputs substantially parallel rays, and a high-transmission lens structure whose face opposite the polished input is formed as step reflecting surfaces "set in the manner of a plurality of side by side cylinders or the slats of a Venetian blind."
4. Adjustable appliance (Claim 4). Bulb with anode and cathode producing an incandescent globule as the source; lens structure with a flat entry surface and elongated light paths perpendicular to that surface, each ending in an angled flat reflecting surface; plus a bearing allowing rotation of the lens structure about its longitudinal axis so the emitted beam direction can be varied.
5. Low-heat intense illuminator (Claim 5). Visible-dominant source + reflector reflecting rays in parallelism; a lens body of highly transparent artificial material with a flat front wall and, on the opposite surface, multiple step-like reflectors each at an angle to and at a definite distance from the flat face, with interrupted portions opposite them to emit light; and a movable mounting for lamp and reflector so the angle of incidence on the polished face — and hence the emitted ray angle — can be changed.
6. Light-supplying/directing mechanism (Claim 6). Evacuated envelope with electrodes + substantially parabolic reflector with the electrodes at its principal focus so rays emerge parallel; a lens structure with an inlet face and riser-like reflecting portions at an angle to the inlet face and tread-like exit portions; and a bearing permitting rotation about an axis substantially perpendicular to the inlet face.
7. Predetermined-area illuminator (Claim 7). Visible-dominant source with a minor heat fraction, plus an elongated highly transparent body that transmits light but blocks heat by conduction/convection; a smooth inlet end; the opposite end formed as horizontally offset wedges, each with a sloping reflecting face confronting the inlet and a portion treated at right angles to the inlet end to facilitate light emission; the body supported for oscillation about its longitudinal axis.
8. Prismatic end-light appliance (Claim 8). A body of juxtaposed rectangular portions, each with a flat end wall as the light inlet and each terminating in a prism-shaped reflecting surface, with a curved trough-shaped depression in a wall angled to the inlet wall confronting each reflector as an outlet; plus means for illuminating the inlet wall with an intense quantity of light.

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Prior art cited on the face of the patent

US 1,102,138 (Churchill, Jun. 30, 1914); US 1,740,747 (Price, Dec. 24, 1929); US 1,820,899 (Greenewalt, Aug. 25, 1931); US 2,040,264 (Mancini et al., May 12, 1936); US 2,286,014 (Jun. 9, 1942); US 2,349,012 (Spaeth, May 16, 1944); US 2,367,579 (Jan. 16, 1945); GB 315,817; DE 418,975; and an unnumbered French patent dated May 24, 1937 (matched in Google's citation table to FR817194, "Decorative lighting device").

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Confidence and uncertainty flags

• High confidence in title, inventor, filing date (1946‑05‑08), issue date (1949‑08‑30), claim count (8), and claim substance — taken directly from the authoritative full text supplied (Google Patents) plus corroborating FreePatentsOnline/SumoBrain text and the original PDF at patentimages.storage.googleapis.com/.../US2480178.pdf.
• Assignee uncertainty: No assignee is recorded; the government licence clause indicates possible Government-funded origin but does not itself establish an assignee. Do not state a corporate assignee.
• Application-number discrepancy (unresolved): printed patent says Serial No. 688,055; Google Patents metadata says US668055A. Reported literally, not corrected.
• OCR-integrity caveat: The full text I was given is heavily OCR-corrupted (e.g., "inlet end 20," "the lens structure I," garbled claim 2/3 text, mixed reference numerals 31/37, 21/27, 41/4 1). Claim 2 and Claim 3 are partially interleaved in the OCR stream, so the reconstruction of Claim 2's middle clause above is paraphrased from context, not quoted verbatim. Anyone needing exact claim language should go to the original PDF image.
• Prior-art name discrepancy (unresolved): the printed patent lists US 2,286,014 as Rowe and US 2,367,579 as Henry, whereas Google's parsed citation table attributes those same numbers to Stanley S. Lieberman ("Airplane angle indicator") and Westinghouse Electric & Mfg Co ("Gaseous conduction discharge device"), respectively. The dates match; the inventor names do not. I cannot resolve which is correct from the material available.
• No CAFC 2026 docket identified. Absence of a hit in the sources searched is not proof of non-existence; if you need a definitive docket negative, a direct PACER/CM-ECF query for "2,480,178" would be required.

I'll search multiple sources for litigation involving US patent 2480178.

Let me run additional targeted searches on litigation databases.

Litigation search results: US Patent 2,480,178

Bottom line: I found no evidence of any litigation — ever — involving US Patent 2,480,178.

I searched Unified Patents' litigation database, CourtListener/RECAP, and general web sources for the number "2480178" (and "US 2,480,178" / "US2480178"). No case with this patent as an asserted patent, an invalidated patent, or a subject of a declaratory-judgment action appeared in any result.

What the patent is

Per the authoritative full text and Google Patents page (https://patents.google.com/patent/US2480178/en):

• Patent: US 2,480,178 — "Light Conductor"
• Inventor / assignee: Ivan H. Zinberg (Newark, N.J.); individually owned
• Filing date: May 8, 1946 (App. No. 668,055)
• Grant date: August 30, 1949
• Status: Expired – Lifetime; anticipated expiration August 30, 1966 (per Google Patents legal-status data)

Why no litigation is unsurprising

• The patent's entire enforceable term ran from 1949 to 1966. The Court of Appeals for the Federal Circuit (CAFC) did not exist until 1982, so any appeal from this patent's era would have gone to a regional circuit court of appeals — records that are largely absent from modern litigation databases and from PACER's searchable coverage.
• The modern litigation data sources you flagged (Unified Patents case list, CourtListener/RECAP, Docket Navigator-type services) generally index district-court dockets from the mid-1990s / 2000s forward, with limited historical coverage. A 1949–1966 infringement suit, if one existed, would very likely not surface in them.
• The patent is instead prominently cited as prior art in later patents and prosecution files — which is often what produces false-positive "2480178" hits. Examples found:
  • GB 2391614 A (McPherson) search report: "US 2480178 (Zinberg), see col 3 lines 70–74 and figs noting lens 19."
  • US 7,434,974 (Parker, light emitting panel assemblies) lists "U.S. 2480178 | August 1949 | Zinberg" in its references cited.
  • FR 2948174 A1 credits "ZINBERG IVAN H dans son brevet US2480178 (A) du 30 août 1949" as an origin of the light-guide beam-division principle.

Explicit non-matches (do not confuse these with US 2,480,178)

Per your instruction to interpret alphanumeric IDs literally and to prefer search results, the following search hits share the digits but are different documents, none of which is US Patent 2,480,178 or litigation of it:

If you want, I can attempt a deeper historical pass (e.g., searching the USPTO Patent Litigation Docket, older "Patent Cases" compilations, or the Westlaw/Lexis historical federal case databases) — but based on the sources available to me and the coverage limits described above, I must report that no litigation involving US 2,480,178 is known. I won't fabricate case names, numbers, or dates for it.

I'll verify the absence of PTAB activity with targeted searches before writing the report.

US 2,480,178 — PTAB Proceedings Report

Light Conductor — Ivan H. Zinberg (filed 1946-05-08; granted 1949-08-30)

Canonical source used: the structured "PTAB proceedings on file" block from the USPTO Open Data Portal (authoritative), corroborated by web search.

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Proceedings overview

There are zero AIA trial proceedings on file for US 2,480,178 — no IPRs, no PGRs, and no CBM reviews (active: 0 / claims invalidated: 0 / claims sustained: 0 / settled: 0 / institution denied: 0). The defensive posture is therefore not "hardened patent" but "dead patent": US 2,480,178 expired — the ODP record carries a legal status of "Expired - Lifetime" with an anticipated expiration date of 1966-08-30 (17 years from the 1949-08-30 grant). An expired patent cannot be infringed, so there is no live enforcement to defend against. The absence of PTAB activity here is not a signal about litigation strength; it reflects the fact that the patent has been off the books for roughly six decades.

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Proceedings

None. There is nothing to list.

No petitioner has ever filed an AIA trial against this patent. Per the operating rules, I am not inventing proceeding numbers, panels, FWDs, or settlements to fill the template. Every one of the following requested data points is empty by fact, not by omission: proceeding number, petitioner/patent-owner identities, judge panel, petition grounds, institution decision, final written decision, settlement/termination, and Federal Circuit appeal.

For auditability, negative searches were run against the PTAB docket surface and general web:

• USPTO PTAB E2E / PTAB Center: https://ptacts.uspto.gov/ptabweb/
• USPTO PTAB decisions library: https://www.uspto.gov/patents/ptab/decisions
• CourtListener (CAFC dockets): https://www.courtlistener.com/?q=US2480178
• Google Patents (authoritative family/status): https://patents.google.com/patent/[US2480178A](/patent/US2480178A)/en

Trap for foreign-number collisions — do NOT conflate these with US 2,480,178. Web search for the bare string "2480178" returns several unrelated documents with the same trailing digits:

• RU 2480178 C1 — Russian patent, "Способ закрытой репозиции переломов пяточной кости" (calcaneal-fracture reduction method). Unrelated.
• FR 2480178 A1 — French application, "Process for producing a packaging, in particular for eggs." Unrelated.
• EP 2480178 B1 — European patent, "Stent including a toggle lock strut." Unrelated.
  None of these is a PTAB matter, and none is numerically identical to the US patent.

One genuine "activity" note: US 2,480,178 does appear as a cited prior-art reference in later US patents — most notably in the light-emitting panel assembly family (e.g., US 7,308,194 / US 7,434,974, Parker / Solid State Opto / Rambus, cited as "US 2480178, August 1949, Zinberg") and in the "Cited By" list on Google Patents. That is citation traffic only; it is not a proceeding and confers no defensive value in the PTAB sense.

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Strategic summary

Claim-by-claim status. US 2,480,178 issued with 8 claims (all originally granted; none ever canceled, because no one ever asked the Board to cancel them). In the useful sense, though, the taxonomy is degenerate: no claim is "CANCELED," none is "SUSTAINED by an FWD," and none is meaningfully "UNTESTED," because the whole patent is expired as of 1966-08-30. All eight claims — the lighting-device claims, the reflector-and-lens-structure claims, the oscillating-lens-structure claims, and the "prismatic area-illuminating appliance of the end-light type" claim — lapsed with the patent term. There is no surviving claim set to map.

Estoppel landscape. 35 U.S.C. § 315(e)(2) estoppel is not applicable to anyone, because no IPR/PGR was ever instituted. There is no prior-art ground "raised or reasonably could have been raised" in a PTAB trial, and no petitioner-privy bar attaches. That is an empty set, not a favorable one: there is also no § 315(a)(1)/(b)(1) bar running against a prospective filer, because nobody has filed.

Pattern signals. No repeat petitioner (there is no petitioner at all). No aggressive PTAB-appeal posture by the patent owner (Zinberg is an individual inventor, and the ODP record lists the assignee as Individual — no defensive aggregator, no Unified Patents-style entity, no successor-in-interest in the chain). One historical detail worth flagging if this patent comes up in a pedigree discussion: it was granted under the Act of March 3, 1883 (37 O.G. 757), and the specification recites that the invention "may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon" — i.e., a standing Government license, not a third-party defensive interest.

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Recommended next steps

• If you have received a demand or an infringement allegation citing US 2,480,178, treat the assertion itself as the red flag — not the PTAB record. The patent expired 1966-08-30 ("Expired - Lifetime" per ODP). It cannot be infringed. There is no FWD to link because none exists; the operative "disposition" is the term lapse, documented on Google Patents and in the ODP legal-status field.
• If you are evaluating a portfolio claim that bundles US 2,480,178 with live patents, ask the asserting party to identify the specific unexpired patent and claim. US 2,480,178 is useful to them only as an ancestry/prior-art citation (it is cited in later light-guide families); it has no independent licensing value.
• If a third party proposes to file an AIA trial on this patent: note two structural points — (1) PGR is unavailable (the patent issued in 1949, long pre-AIA) and CBM is inapplicable (this is not a financial business-method patent under § 18 of the AIA); (2) IPR under § 311(a) is technically available even for an expired patent, but with no live infringement exposure and no claim scope to constrain for future damages, a petition would be a solution in search of a problem.
• No trial-stage milestones to track. There is no institution deadline, no oral hearing, and no statutory one-year FWD date, because there is no trial. The "no PTAB activity" finding is the complete answer — and in this particular instance it is a much weaker signal than usual, because a 1949 patent that expired in 1966 would never be expected to attract an AIA trial in the first place.

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Confidence statement: I am highly confident there are no AIA trial proceedings on this patent — the structured ODP block is negative and the web searches surface nothing but same-number foreign documents and prior-art citations. I did not locate, and am not asserting, any proceeding number, panel, FWD, settlement, or appeal for US 2,480,178.

I'll research the assignment/ownership record for US 2,480,178, starting with the authoritative patent text and then probing assignment databases.

Let me probe the Assignment Center and related ownership sources directly.

Let me try a few more targeted probes on Zinberg's other patents and any corporate linkage.

Ownership & Assignment Analysis — US Patent 2,480,178 ("Light Conductor")

Method note / limitation. My tooling for this task is web-search access only; I could not execute a live query against the USPTO Assignment Center API (https://assignmentcenter.uspto.gov/), so I could not pull raw reel/frame images myself. I therefore triangulated three independent ownership indexes — Google Patents legal-events/assignee data (https://patents.google.com/patent/US2480178/en), FreePatentsOnline (https://FreePatentsOnline.com/2480178.html), and Justia Patents — plus the authoritative full patent text supplied to me. All three indexes agree: no assignee is named on the patent and no post-issuance reassignment is recorded. I flag below exactly what that does and does not establish.

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Inventors

• Sole inventor. The patent is signed "IVAN H. ZINBERG" and lists no co-inventors.
• Unusual pattern to note (not a fire-sale tell): the specification carries the printed government-license clause — "The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon" — and the citation "Granted under the act of March 3, 1883, as amended April 30, 1928; 370 O.G. 757."
  • This language is not an assignment. It records that the U.S. Government holds a royalty-free, non-exclusive license (a "shop right"/license), while the inventor retained title. The clause is characteristic of an invention made with government involvement (e.g., a wartime contract or government-funded development), which is consistent with the 1946 filing date.
  • I cannot name Zinberg's employer (government agency, contractor, or private concern) with confidence. No source I located ties him to a corporate assignee. I will not guess at an employer.
• No "inventor departure" pattern is observable because there was never a corporate assignee to depart from — the "all inventors leave within 12 months" tell requires an employer-assignee, which does not exist here.

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Original assignee

There is no original assignee. The patent issued to Ivan H. Zinberg as an individual.

• Entity named on the issued patent: None. The face reads "Ivan H. Zinberg, Newark, N. J." with no assignee designation (contrast with patents that print "assignor to Acme Corp.").
• Google Patents classification: "Current Assignee — Individual"; "Original Assignee — Individual." This reflects that title was never conveyed.
• Product embodying the claims: No evidence found that Zinberg or any entity ever commercialized an embodiment of claims 1–8. The disclosed device (a zirconium-cathode arc lamp + parabolic reflector + stacked acrylic light-guide "lens structure" for heat-free studio lighting) appears in the record only as an apparatus description; I found no product, trademark, or SEC filing linked to it.
• Primary line of business: Occurs as an independent inventor in this record. Beyond that, undetermined.
• Current status of the title-holder: The patent reached anticipated expiration on 1966-08-30 (per Google Patents legal-status data). Any residual individual title is long extinct; no successor entity (estate, holding company, or acquirer) appears in any ownership index I could reach.
• Practical consequence: Because the patent expired in 1966, no present-day entity can hold or assert it. Any "assignment" question here is purely historical/archival.

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Assignment timeline

Plain finding: the USPTO/Google Patents legal-events record for US 2,480,178 contains NO recorded assignment — not at issue, and not post-issuance.

The only recorded legal events are the ordinary prosecution/publication milestones:

There is no Assignment, Security Agreement, Merger, Change of Name, License, Release, or Correction record to report — hence no reel/frame numbers, no assignors, no assignees, and no correspondents of record exist to cite.

Per the task instruction, this is the "no records" case, and I state it plainly. One caveat for rigor: the absence of indexed records is strong but not mathematically identical to "the USPTO has zero paper assignment filings on this patent" — pre-1966 filings were paper-recorded, and my search tooling could not open the Assignment Center's scanned-reel viewer. What I can say with high confidence is that no ownership change is reflected in any modern ownership index for this patent, and title never left Ivan H. Zinberg in any documented transaction.

I am continuing past this point (rather than stopping) only to answer the verdict question you asked. The remaining sections are necessarily short, because a chain with zero links cannot exhibit transfer-based signals.

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Timeline diagram

timeline
    title Ownership of US 2480178
    1946 : Filed by Ivan H Zinberg
         : App No 668055
    1949 : Issued to Zinberg as individual
         : US Government holds royalty-free license
    1966 : Patent expired

(Two events in 1949 are both rendered on the same year via the leading-colon convention; event text kept free of punctuation.)

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NPE / troll-pattern signals

Net: All eight signals are not present, and this is driven entirely by a null chain (no recorded assignments), not by any affirmative clean-ownership evidence.

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Verdict

Insufficient data — the "no records / only the original issuance" branch.

Justification: the patent issued 1949-08-30 to Ivan H. Zinberg as an individual with no assignee named on its face and no recorded assignment in any ownership index (Google Patents shows Current and Original Assignee = "Individual"; FPO and Justia show none); the only recorded legal events are filing (1946-05-08), grant, and expiration (1966-08-30). With zero post-issuance links, none of the transfer-based NPE signals can be present, and the non-exclusive U.S. Government license created by the printed "act of March 3, 1883" clause is a license, not an assignment, and does not convert this into a defensive-aggregation case. I cannot certify that no pre-1966 paper assignment was ever filed, because my tooling could not open the Assignment Center's scanned reels — but no modern index reflects one, so "Insufficient data" is the honest call rather than "Operating-company assertion" or any NPE finding.

Verify at: USPTO Assignment Center — https://assignmentcenter.uspto.gov/ (search "2480178") and the legacy interface — https://assignment.uspto.gov/patent/index.html

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Contradiction / cross-reference flag

• This result is consistent with the previously generated litigation section (no litigation ever; patent expired 1966; only citation-as-prior-art hits such as GB 2391614 A and US 7,434,974). No contradiction found.
• One nuance worth elevating: the earlier sections did not mention the U.S. Government royalty-free license clause printed on this patent. That clause is an ownership-relevant fact (it limits the inventor's exclusive rights against the Government) even though it is not a recorded assignment. It belongs in the ownership file and I have added it above.

I'll ground this analysis with targeted searches on the patent and each of its ten cited references.

Excellent — one reference (US 2,286,014) turns out to be a light-pipe disclosure in "Lucite," which is highly material. Let me pull the remaining references.

I hit the tool-step limit mid-batch, so this report is built from (a) the authoritative full patent text supplied in the prompt, (b) the Google Patents citation block for US 2,480,178, and (c) the searches that completed. I flag explicitly below which reference contents I verified directly and which I could not.

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Prior-Art Analysis — US Patent 2,480,178

1. Target confirmation (USPTO record)

Searching the specific number 2480178 returns exactly one US patent. I did not substitute any lookalike.

Number collisions to exclude (literally different documents — do not conflate): EP 2480178 B1 ("Stent including a toggle lock strut"); RU 2480178 C1 (calcaneal-fracture reduction); FR 2480178 A1 (egg-packaging process); CA 2480178 A1. None is US 2,480,178, and none is prior art to it.

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2. Governing §102 framework (important for reading the mapping below)

US 2,480,178 was filed 1946-05-08, so it was prosecuted under R.S. §4886 et seq. For modern analysis it is mapped to pre-AIA 35 U.S.C. §102. The controlling date for the one-year statutory bar is 1945-05-08.

Result of the date check: all ten references on the face of the patent issued/published before 1945-05-08, so all ten are §102(b) statutory bars — and, being dated 1926–1945, all are likewise §102(a) art as against any plausible 1945–46 invention date. That is why the examiner cited them: they are all knockout-date art, not merely "analogous" art.

⚠️ No reference is post-bar-date. There is no §102(e) (secret prior art) or §102(g) reference in this set; no citation is a pending, unpublished US application.

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3. The claim set being tested (as printed)

For §102 mapping, the 8 claims reduce to these element clusters:

• Cl. 1 — lamp (high visible/low heat) + plurality of lens structures + light-receiving ends + interrupted light-emitting side portions + mounting for oscillation over a limited arc + operating member + lines for remote oscillation.
• Cl. 2 — bulb (visible spectrum) + reflector + lens structure with flat polished face confronting bulb/reflector + light piped through + step reflecting surfaces + depressions in the step surface to emit light.
• Cl. 3 — plurality of rectangular box-shaped portions + reflecting surface angled to polished surface + curved-wall channels under the reflectors forming exits.
• Cl. 4 — bulb with anode and cathode forming an incandescent globule + lens structure + elongated paths perpendicular to the flat surface, each ending in a flat reflecting surface + bearing for rotation on the longitudinal axis.
• Cl. 5 — visible source + reflector concentrating rays in parallelism + lens structure of highly transparent artificial material + flat wall + step-like reflecting surfaces + interrupted emitting portions + movable mounting for lamp and reflector.
• Cl. 6 — evacuated envelope with electrodes + substantially parabolic reflector with electrodes at the principal focus + riser/tread (staircase) structure + rotation about an axis perpendicular to the inlet face.
• Cl. 7 — source chiefly visible rays + elongated body of highly transparent material that transmits light rays and prevents heat transmission by conduction or convection + smooth light-transmitting end + opposite end as series of horizontally off-set wedges with sloping reflecting faces + treated emitting face + supported for oscillation about its longitudinal axis.
• Cl. 8 — prismatic area-illuminating appliance of the end-light type: juxtaposed rectangular portions + flat end-wall inlet + prism-shaped reflector at the far end + curved trough-shaped depression in a wall at an angle to the inlet wall confronting the reflector, forming the outlet + means to illuminate the inlet with intense light.

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4. Reference-by-reference analysis

★ Rank 1 — US 2,286,014 — the single most material reference

Description (verified from the specification text): An aircraft attitude indicator in which the dial is illuminated through "translucent rods of a suitable plastic composition having the property of transmitting light from one end thereof to the other end regardless of the bends in the rod." The patent expressly identifies the material: "an organic plastic resin, (polymethyl methacrylate) … now being supplied to the industry under the trade-mark 'Lucite' by E. I. du Pont de Nemours & Company." It states that "'Lucite' rods have the property of so transmitting light that when one end is light energized, the light energy flows through the rod to the other end thereof in the direction of the axis of the rod with comparatively small loss even though said axis may have bends therein."

Why this is the key citation: it is the closest prior-art teaching of the core "light conductor" concept itself — a highly transparent artificial (methacrylate) body used as a light pipe — and it predates Zinberg's filing by four years, in the same material family (acrylic/methacrylate; compare Zinberg col. 4: "a suitable material… is an acrylic resin and particularly a methacrylate").

Claim(s) it potentially anticipates (§102(b)):

• Claim 7 — best candidate. Rowe discloses the "elongated body of a highly transparent material" that receives light at one end "and transmit[s] rays of light from said source longitudinally of said body." ✅ Element met.
• Claim 5 — discloses the "highly transparent artificial material" limitation. ✅ Element met.
• Claim 8 / Claim 2 — the "end-light type" input face and light-piping body are arguably disclosed. ⚠️ Partial.

Candid caveat (this matters): Under §102 a single reference must disclose every element. Rowe does not disclose the reflector collimating rays into parallelism, the step/wedge reflecting surfaces, the curved trough-shaped exit depressions, or the limited-arc/remote oscillation mounting. So Rowe is not a clean full-claim anticipation of any of claims 1–8; it is a dominant §102(b) teaching that removes the novelty of the "light-conducting plastic body" element, and it is the reference a §103 obviousness rejection would be built around. I am not overstating it as an anticipation of a whole claim.

⚠️ Discrepancy to flag (do not silently "correct"): the patent's own printed "References Cited" list names the inventor as "Rowe." The Google Patents citation-metadata block attributes US2286014A to "Stanley S Lieberman"; the Unified Patents record likewise says "Stanley S Lieberman"; a third index (patenthub CPC list) gives the inventor as "ROBERT ROWE." The patent's front-page citation ("Rowe") and the CPC index ("Robert Rowe") agree; the two database entries appear to be mis-attributed. I am recording this as an unresolved identifier conflict rather than choosing one.

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★ Rank 2 — DE 418,975 C — the edge-lit flat light-guide reference

Description: An illuminated sign consisting of a glass plate edge-illuminated from a light source located at its cross-section (edge), i.e., light is injected through the plate's edge and emitted from the plate face. This is the classic edge-lit light-guide geometry — the same architectural principle as Zinberg's "flat polished inlet end… perpendicular to the rays… piped or transmitted along it."

Claim(s) it potentially anticipates (§102(b)):

• Claim 2 — flat face receiving light that then exits through surface irregularities. ⚠️ Partial.
• Claim 5 — edge-input transparent body with interrupted light-emitting portions. ⚠️ Partial.
• Claim 7 — end-light elongated transparent body. ⚠️ Partial.
• Claim 8 — "of the end-light type." ⚠️ Partial — the "end-light" genus is squarely here.
• Claim 3 — arguably, if the German plate carries angled/stepped reflecting means. ⚠️ Unverified.

Caveat: I could not retrieve the German specification text, so I am mapping on the strength of the title/abstract as recorded by Google Patents. The direction (edge-input flat guide) is clear; the specific step/wedge reflector geometry is not established.

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★ Rank 3 — US 1,820,899 — reflector + lamp at the focus (verified)

Description (verified from the specification text): A stage/auditorium lighting appliance with a parabolic reflector, a compact high-intensity light unit "mounted in the reflector 42 in such position that the filament is located at substantially the focus of the reflector," means to vary the direction and character of the light (revolving color wheels, motorized, operator-controlled), and an adjustable/compact mounting. The specification states the reflector "is of substantially parabolic shape, in longitudinal section."

Claim(s) it potentially anticipates (§102(b)):

• Claim 5 — "reflector for concentrating and reflecting said rays in parallelism" — the parabolic-reflector-with-lamp-at-focus element. ✅ Element met.
• Claim 6 — "substantially parabolic reflector mounted so that said electrodes occupy the principal focus." ✅ Element met.
• Claim 2 — bulb + adjacent reflector + selective illumination (color variation). ✅ Element met for the lamp/reflector/selectivity sub-combination.

Note (adjacent, not a contradiction of the earlier litigation finding): this reference's inventor was herself a litigant — Greenewalt v. Stanley Co. of America, 54 F.2d 195 (3d Cir. 1931) (invalidating her reissue patent 16,825 for lack of statutory subject matter). That case concerns a different patent, not US 1,820,899 and certainly not US 2,480,178, so it does not contradict the earlier "no litigation on 2,480,178" conclusion. I raise it only because searching US1820899 surfaces that case and it is a plausible false positive.

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Rank 4 — GB 315,817

Description: Motor-vehicle electric headlamp improvements — lamp + reflector beam-forming optics, i.e., the reflector-and-lamp collimation environment.

Claim(s) it potentially anticipates (§102(b)): Claim 2 and Claim 5 (reflector adjacent a bulb reflecting rays), and Claim 6 (parabolic reflector geometry) — element-level only. Headlamps do not disclose a light-piping lens structure, so no whole-claim anticipation.

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Rank 5 — FR 817,194

Description: Decorative lighting device — decorative/architectural light distribution, part of the 1930s "distributed illumination" art.

Claim(s) it potentially anticipates (§102(b)): Claim 8 (area-illuminating appliance) and, at element level, Claims 2 and 3. ⚠️ Mapping based on title only; specification not retrieved.

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Rank 6 — US 1,740,747

Description: An electrically illuminated sign/emblem — illuminated display art, illuminating a selected area from a luminous source.

Claim(s) it potentially anticipates (§102(b)): Claim 2 ("means for selectively illuminating an object") and Claim 8 (area-illuminating appliance) — at the level of purpose/environment only. This is the weakest of the illumination-class references.

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Rank 7 — US 2,367,579

Description: A gaseous-conduction (arc/discharge) lamp device — the lamp-source side.

Claim(s) it potentially anticipates (§102(b)):

• Claim 1 — "an electric lamp having in its output a high percentage of visible light rays and a low percentage of heat rays." ⚠️ Element met at the lamp level.
• Claim 4 — bulb having an anode and a cathode. ⚠️ Partial.
• Claim 6 — "an evacuated envelope having electrodes in it which furnish a luminous source of visible light." ✅ Closest element-level fit of any reference on this element.
• Claim 7 — source of radiant energy chiefly visible. ⚠️ Element met.

Note: a discharge-device reference supplies only the lamp half of claims 1/4/6/7; the lens-structure half is absent, so no full-claim anticipation.

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Rank 8 — US 2,349,012

Description: Drive/oscillation circuitry for illuminating electronic discharge lamps — the electrical/lamp-operating side, i.e., the "electrodes producing a luminous spot" environment of Zinberg's zirconium-globule arc lamp.

Claim(s) it potentially anticipates (§102(b)): Claim 1, Claim 4, Claim 6 — element-level only (lamp/discharge element). Notably it says nothing about the "incandescent globule" point source, the reflector, or the lens structure.

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Rank 9 — US 1,102,138

Description: A mounting for lenses and mirrors (structural support/holder art), not a light-transmission device.

Claim(s) it potentially anticipates (§102(b)):

• Claim 1 — the "mounting in which said lens structures are supported" sub-element. ⚠️ Element met only.
• Claim 6 / Claim 7 — the "bearing"/"supported for oscillation" structural sub-element. ⚠️ Element only.

⚠️ Search caution: searches for Churchill surface US 1,081,211 (Churchill, "Optical System," 1913) and US 1,112,470 (Oldfield, "Lens or Reflector Support," 1914) — neither of which is the cited US 1,102,138. I did not retrieve the US 1,102,138 specification itself, so my description rests on the title as recorded in the patent and by Google Patents.

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Rank 10 — US 2,040,264 — weakest fit

Description: Per the recorded title, a beverage-aging apparatus. This is almost certainly cited for a sub-combination ancillary to the claim set — most plausibly a radiant/heat-lamp or enclosed luminous-source arrangement (which would bear on Zinberg's stated object of illuminating "without subjecting such to the effects of heat") — and not for the light-guide architecture.

Claim(s) it potentially anticipates (§102(b)): None identified with confidence. I could not retrieve its specification, and on its face the reference does not disclose a lens structure, a polished inlet face, or step reflectors. I will not manufacture a claim mapping for it.

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5. Consolidated mapping table

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6. Bottom line

1. No single cited reference anticipates any of claims 1–8 in full. Each reference of record lacks at least one essential element of every claim. Under §102, anticipation requires all elements in one reference; that condition is not met here for any of the ten.

2. The set is, however, cumulatively fatal to the "novelty" of the invention's building blocks, and it is the kind of set that supports a §103 obviousness rejection:

   • US 2,286,014 (Rowe, 1942) supplies the methacrylate "Lucite" light-pipe — the very material and light-transmission property Zinberg claims.
   • DE 418,975 (1926) supplies edge-injected flat light-guide emission — the "end-light type" genus of claim 8.
   • US 1,820,899 (Greenewalt, 1931) supplies the parabolic reflector with the lamp at its focus — the collimation element of claims 5 and 6.
   • US 2,367,579 / US 2,349,012 supply the gaseous-discharge lamp with electrodes — the source element of claims 1, 4, 6.
     Combine these and Zinberg's remaining inventive contribution narrows to the step/wedge reflector-plus-trough-exit geometry and the remote, limited-arc oscillation mounting (claims 1, 3, 7, 8).

3. Practical significance is nil. Per the earlier PTAB section, this patent expired 1966-08-30. §102 analysis here is historical/defensive-citation only (it is cited as prior art in later light-guide families, e.g. US 8,142,063 / US 10,048,500 — "2480178 | August 1949 | Zinberg"). There is no live claim to invalidate and no term to construe.

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7. Discrepancies and cautions I will not paper over

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8. Sources

• US 2,480,178 (authoritative full text): https://patents.google.com/patent/US2480178A/en · https://FreePatentsOnline.com/2480178.html
• US 2,286,014 full specification: https://patentimages.storage.googleapis.com/29/8f/98/d1c83d8370db3d/US2286014.pdf · https://patents.google.com/patent/US2286014
• US 1,820,899: https://patents.google.com/patent/US1820899A
• Greenewalt litigation (different patent, flagged as false positive): https://www.cetient.com/case/greenewalt-v-stanley-co-of-america-[1497897](/patent/1497897) · https://storage.courtlistener.com/harvard_pdf/[8843694](/patent/8843694).pdf
• Later light-guide families citing 2,480,178: https://patents.justia.com/patent/[10048500](/patent/10048500) · https://patents.justia.com/patent/[8142063](/patent/8142063)
• FR 2948174 A1 (credits Zinberg US2480178 as origin of the light-guide beam-division principle): https://patents.google.com/patent/FR2948174A1/en

Confidence statement. I am highly confident of the target's identity and bibliographic data (Google Patents, FreePatentsOnline and SumoBrain agree and match the USPTO application number). I am highly confident in the §102(b) date analysis — every cited reference published before 1945-05-08. I am highly confident, from the verified specification text, that US 2,286,014 (Rowe) discloses a Lucite/polymethyl-methacrylate light pipe — the single most material teaching in this set. I have lower confidence in the element-level claim mappings for the references whose full texts I could not retrieve (items 4, 5, 6, 8, 9, 10 in the table) and for the four OCR-corrupted claims (2, 3, 5, 6); those should be verified against the printed PDFs before being relied upon. I have identified no reference that anticipates any claim of US 2,480,178 in its entirety.

I'll fill a few gaps in the reference record before constructing the §103 combinations, since motivation-to-combine arguments depend heavily on what the un-retrieved references actually disclose.

I hit the tool-step limit mid-verification, so this report is built on (a) the authoritative full text supplied in the prompt, (b) the Prior Art section already generated on this page, and (c) the searches that completed this pass. I flag below exactly which reference contents are now verified versus still un-retrieved, and I do not carry forward any assumption as fact.

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§103 Obviousness Analysis — US 2,480,178 ("Light Conductor")

1. Posture: why §103, not §102, is the operative question

The Prior Art section on this page reached the correct threshold conclusion: no single cited reference discloses every element of any of claims 1–8, so there is no clean §102 anticipation. Under Graham v. John Deere Co., 383 U.S. 1 (1966), that determination is only the first of the four Graham factors. The claim set must now be tested against the scope and content of the prior art as a whole, the differences between the prior art and the claims, and the level of ordinary skill.

Legal-standard caveat (important, and I am not smoothing it over). US 2,480,178 was filed 1946‑05‑08 and granted 1949‑08‑30, i.e. pre‑1952 Act. At issuance the governing test was the R.S. §4886 "invention" requirement as construed in Cuno Engineering Corp. v. Automatic Devices Corp., 314 U.S. 84 (1941) — the "flash of creative genius" formulation. Modern analysis applies pre‑AIA §103(a) as construed in Graham and KSR Int'l Co. v. Teleflex Inc., 550 U.S. 398 (2007). The KSR framework (expansive rationales, "obvious to try," predictable variation, design incentives) is materially more permissive than the 1949 standard. I therefore state the result conditionally throughout: these claims would likely fare better before a 1949 examiner than before a modern court applying KSR. I do not assert how any court would resolve a pre‑1952-Act standard-of-invention question, because the patent expired 1966‑08‑30 and no court will reach it.

Practical frame. Because the patent is expired, the only live consequences of this analysis are (i) historical validity assessment, and (ii) the weight of US 2,480,178 as prior art against later patents — an invalid patent remains valid prior art for what it discloses (its disclosure, not its claims, is what matters; see the Philips WO2007072340 X-citation and FR 2948174's credit to Zinberg noted earlier).

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2. Level of ordinary skill in the art (PHOSITA)

Derived from the references of record themselves, not assumed:

This skill level is high enough that a designer confronting "deliver intense studio light without dumping heat on the talent" would have had both the light-pipe tool and the collimating-reflector tool in hand. That is the pivot of the whole §103 case.

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3. Isolating the invention's actual delta (per the Graham "differences" factor)

Stripping the claims of everything independently taught by the cited art leaves a surprisingly small residue:

Residue — the only arguably novel subject matter:

1. The step/wedge ("riser") reflecting facets and the curved trough-shaped ("tread") exit depressions, arranged as a stacked, stair-stepped emitting surface (claims 2, 3, 5, 6, 7, 8).
2. Stacking plural transparent slabs of different lengths with horizontal faces in contact, so dust cannot settle on the transmitting interfaces (claims 1, 3, 8; spec. ¶ beginning "2. It assumes that the surface be free from dust…").
3. Ganged, limited-arc oscillation of plural light guides from a remote location via pull lines (claim 1).
4. The heat-isolation-by-physical-separation function (guide passing through the wall as a barrier) (claims 5, 7).
5. The stated acoustic advantage of the serrated emitting surface (spec.)

Items 3–5 are the patent owner's only genuinely distinctive contributions. Items 1–2 are where §103 bites hardest.

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4. Combination architecture

graph TD
    A[Rowe US2286014 1942<br/>acrylic light pipe] --> CORE
    B[DE418975 1926<br/>edge-lit flat plate] --> CORE
    C[Greenewalt US1820899 1931<br/>parabolic reflector source at focus] --> CORE
    CORE[COMBO I and II<br/>collimated edge-lit light guide with stepped extraction] --> C1[Claims 2 3 5 6 7 8]
    D[Churchill US1102138 1914<br/>lens and mirror mounting] --> C1
    E[US2367579 Westinghouse 1945<br/>plus US2349012 Spaeth 1944<br/>discharge lamp source] --> C2[Claims 1 4 6 lamp element]
    F[GB315817 Lucas 1929<br/>headlamp reflector] --> C1
    G[US1740747 Price 1929<br/>plus FR817194 1937<br/>illuminated display] --> C3[Claims 2 8 purpose level]
    H[US2040264 Mancini 1936<br/>whisky aging apparatus] --> X[NOT ANALOGOUS<br/>no combination]

Primary combination (the one that matters):
US 2,286,014 (Rowe) + DE 418,975 (Lewin) + US 1,820,899 (Greenewalt), optionally supplemented by GB 315,817 (Lucas) for the reflector element and US 1,102,138 (Churchill) for the mounting element.

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5. Motivation to combine — the KSR rationale ledger

Under KSR, a motivation need not appear on the face of any reference; it may come from the knowledge, creativity and common sense of the PHOSITA, market forces, or the nature of the problem. Here the motivations are unusually well documented because all three core references were addressing the same underlying design pressure — getting more usable light to a place you cannot or do not want to put the lamp.

Teaching away — search performed and result: I find no reference in the cited set that teaches away from edge-lit light-piping, from acrylic as the guide medium, or from stepped extraction surfaces. The only candidate is the specification's own recitation of the art's "practical limitations" (optically imperfect surfaces, dust/dirt, limited edge-injection flux) — see §7.2.

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6. Claim-by-claim §103 mapping

6.1 Claims 3, 5 and 8 — most vulnerable (highest confidence)

Combination: Rowe + DE 418,975 + Greenewalt [+ GB 315,817].

Why the stepped/trough geometry is reachable under §103 (not under §102): the PHOSITA who must extract light from the end of a piped guide has a small, well-defined menu: a beveled end face at greater than the critical angle, a scattering surface, or a facet-and-window pair. Claim 3's own alternative phrasing — surfaces "set in the manner of a plurality of side by side cylinders or the slats of a Venetian blind" — is an admission that the inventor himself regarded flat facets and cylindrical facets as interchangeable equivalents. Under KSR this is close to a concession of predictable variation; a claim that expressly covers two interchangeable geometries invites the conclusion that selecting between them was within ordinary skill. That is a powerful point against claim 3.

Residual strength: neither Rowe nor DE 418,975 is shown (on the record available to me) to disclose the specific combination of a flat angled reflecting facet plus an underlying arched trough exit in a stacked, offset-wedge array. I could not retrieve the DE 418,975 specification, so its disclosure of emission-surface geometry remains unverified — this is the single biggest evidentiary hole in the §103 case and it cuts in the patent owner's favour.

Assessment: claims 3, 5 and 8 are, more likely than not, obvious over Rowe + DE 418,975 + Greenewalt — with the caveat that the case depends on a DE 418,975 disclosure I have not inspected, and on treating the faceted/trough extraction geometry as a predictable design choice rather than an inventive one.

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6.2 Claims 2 and 7 — moderately vulnerable

Combination: same core, plus US 1,740,747 (Price) and/or FR 817,194 for the selective-illumination / area-illumination purpose element, and Churchill for the mounting.

• Claim 2 adds only: bulb + adjacent reflector + flat polished face + step reflectors + depressions "adjacent to and under" the reflectors. The functional core is supplied by the core combination; the "selectively illuminating an object" purpose is fully met by Price and FR 817,194 at the purpose level. Caveat: claim 2 is one of the four OCR-corrupted claims, so element-by-element mapping must be re-verified against the printed PDF before reliance.
• Claim 7 adds two things that look clever but are weak under §103:
  • "prevents the transmission of heat by conduction or convection" — this is an inherent property of any solid dielectric waveguide; heat is not convected or conducted efficiently along a thin acrylic slab from a remote source. Inherency is not novelty, and an inherent, expected advantage is not non-obviousness.
  • "treated to facilitate the emission of light" — an unbounded functional recitation ("treated") with no structural definition. Under §103 an unclaimed-species functional limitation is given little weight; the PHOSITA need only roughen, coat or bevel, all routine.
  • "supported for oscillation about its longitudinal axis" — supplied by Churchill's mounting art plus ordinary mechanical skill.
• Claim 7's one genuinely interesting feature is the wall-penetrating guide acting as a barrier — a structural consequence of the already-known fact that the light source is remote. That is arguably a new use of the light pipe, which under pre‑1952 doctrine could support "new use" reasoning — but a new use of an old device, absent structural novelty in the device, is generally not patentable subject matter, and here the structure is not even new in the relevant respect.

Assessment: claims 2 and 7 are probably obvious, at moderate confidence (higher for 7, lower for 2 given the OCR problem).

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6.3 Claims 1, 4 and 6 — least vulnerable; where the §103 case has real gaps

These three claims contain the limitations the record does not supply from any reference, and they are where a competent patent owner would fight.

Additional gap relevant to claims 1, 3 and 7: the recited lamp output "a high percentage of visible light rays and a low percentage of heat rays" is nowhere supplied by the cited art — and the Westinghouse reference actively points the other way (a UV-emitting discharge tube is a high-UV, not low-heat, source). Zinberg's zirconium-oxide-cathode incandescent-globule lamp is the true enabling foundation of the "cold light" premise, and the record does not contain it.

However — and this is the counterweight the PHOSITA applies under KSR — a low-heat, high-visible point source was the known object of the search, and the patent's own specification establishes the design goal. Selecting a known type of high-brightness, predominantly-visible emitter to pair with a known collimator to achieve a sought-after output characteristic is squarely "use of a known technique… to yield predictable results." The lamp gap is therefore evidentiary, not legal: it survives §103 on this record and would not survive once any reference disclosing a concentrated-arc or zirconium-type point source is added — which, given the 1940s state of arc-lamp art, would not have been hard for an examiner to do.

Assessment: claims 1, 4 and 6 are the least likely to be held obvious on the record as it stands, and claim 4 is the strongest of the three (the incandescent-globule point source is a real, unrebutted gap). But their survival is attributable to thinness of the cited art, not to demonstrated invention — a distinction worth stating plainly rather than calling these claims "non-obvious."

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7. Secondary considerations and Graham rebuttal factors

7.1 What the record supports — and it is not much

Nexus problem, stated bluntly: the only secondary consideration with any factual support is the long-felt need, and the very same evidence (the patent's Background paragraph) supplies the KSR motivation to combine. A secondary consideration that is simultaneously a motivation to combine carries no rebuttal weight.

7.2 The specification's "practical limitations" passage — teaching away, or a roadmap?

The specification recites three "practical limitations" on light-piping:

1. it assumes an "optically perfect surface… not practical to produce in quantity";
2. it assumes the surface "be free from dust and dirt";
3. "there is a limitation on the amount of light which can be reflected into the inlet edge."

Read as teaching away, this is the patent owner's best rhetorical move: the art allegedly believed light-piping was impractical at this scale, so the combination was not obvious. Read as KSR roadmap, it is fatal: Zinberg then tells you, in the same breath, exactly how he solved each — (1) the "polarity of the light source here employed and the short distance" make entrance loss "negligible"; (2) dust is avoided "by stacking or piling the lens portions with their horizontal faces in contact"; (3) the flux limitation is solved by "the high-intensity small-area source of light here employed." Under KSR, "the identified problem was known and the solution flows from the known properties" is a conclusion of obviousness, not of invention — and a specification that narrates problem-and-solution in three tidy steps is unusually vulnerable to that reading.

7.3 Non-analogous art

Under pre-AIA doctrine, a reference qualifies as analogous if it is from the same field of endeavour or reasonably pertinent to the particular problem. Applying that:

• US 2,286,014 (Rowe) — airplane attitude indicator. Different field, but the problem is "get light to a readout through a small, awkward aperture without a lamp behind it" — reasonably pertinent. Analogous. ✅
• DE 418,975 (edge-lit sign) and FR 817,194 / US 1,740,747 (illuminated signage) — signage is reasonably pertinent to controlled area illumination. Analogous. ✅
• GB 315,817 (vehicle headlamp) and US 1,820,899 (stage lighting) — same field / directly pertinent. Analogous. ✅
• US 2,367,579 and US 2,349,012 (discharge lamps) — the source art. Analogous to the lamp element. ✅
• US 1,102,138 (Churchill) — lens/mirror mounting; structural-support art, pertinent to the mounting elements. Analogous. ✅
• US 2,040,264 (Mancini et al., "Apparatus for aging whisky or other alcoholic beverages," 1936) — ⚠️ the only reference I cannot place as analogous. Nothing on its face is reasonably pertinent to distributing light through a transparent body. I decline to use it in any §103 combination. If it was cited for a radiant-heat sub-combination, that purpose is not visible from the title, and my searches this pass returned other whisky-aging patents (US 2,209,474 Price, Whisky Aging Device, 1940; US 2,196,193 Chambers, Method of Aging Alcoholic Liquors, 1940) — neither of which is the cited US 2,040,264. The reference remains unverified.

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8. Consolidated verdict matrix

Bottom line. Under §103 as construed in Graham/KSR, claims 3, 5, 7 and (probably) 8 and 2 would very likely be rejected as obvious over US 2,286,014 + DE 418,975 + US 1,820,899, with GB 315,817 and US 1,102,138 as secondary references for the reflector and mounting elements. Claims 1, 4 and 6 would likely survive on this record — chiefly on the plurality-plus-remote-lines limitation of claim 1 and the incandescent-globule point source limitation of claim 4, both of which the cited art simply does not address. Their survival reflects an incomplete record, not established invention: any primary reference disclosing a concentrated zirconium-type arc point source, and any reference for remote cable-actuated ganged fixtures, would close those gaps. Under the stricter 1949 "invention" standard, all eight claims would have a materially better chance.

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9. New verification results from this pass (and what remains open)

Verified for the first time this pass:

• US 2,367,579 — confirmed to be a Westinghouse Electric & Mfg Co device (Google Patents assignee field), directed to "gaseous conduction discharge devices… wherein a positive column discharge is maintained between spaced electrodes of the cold cathode type within an elongated tubular envelope, such as… ultra-violet lamps, fluorescent tubes, and the like." Claimed subject matter: hollow cylindrical metal electrodes, thermionically active material on inner surfaces, inert gas at ~10 mm Hg admixed with mercury vapour, "operating… on alternating current with ballast resistance in series." This is a fluorescent/UV tube, not a point-source incandescent-globule arc lamp. That materially weakens the lamp-element mapping for claims 1, 3, 4 and 7 that the Prior Art section flagged at "Medium" confidence. Source: https://patents.google.com/patent/[US2367579A](/patent/US2367579A)

Still un-retrieved (do not treat as verified): DE 418,975 (Lewin) specification; GB 315,817 (Lucas) specification; FR 817,194 specification; US 1,740,747 (Price) specification; US 1,102,138 (Churchill) specification; US 2,040,264 (Mancini) — the whisky-aging reference, for which my search returned only different whisky-aging patents (US 2,209,474 to Price; US 2,196,193 to Chambers et al.), neither of which is the cited document.

Discrepancies carried forward — not silently corrected:

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10. Sources

• US 2,480,178 authoritative text: https://patents.google.com/patent/[US2480178A](/patent/US2480178A)/en
• US 2,367,579 (verified this pass): https://patents.google.com/patent/US2367579A
• US 1,820,899 (Greenewalt): https://patents.google.com/patent/[US1820899A](/patent/US1820899A)
• US 2,286,014 (Rowe) full specification: https://patentimages.storage.googleapis.com/29/8f/98/d1c83d8370db3d/US2286014.pdf
• Churchill US 1,081,211 (not the cited reference; flagged): https://patentimages.storage.googleapis.com/92/35/f5/b1e916588b48dd/US1081211.pdf
• Whisky-aging art surfaced in error (not the cited US 2,040,264): https://patentimages.storage.googleapis.com/78/b6/e4/426e76fa91c4a8/US2209474.pdf · https://patentimages.storage.googleapis.com/25/32/61/ba46c810e93a11/US2196193.pdf
• Prior-art citation traffic: https://patents.google.com/patent/WO2007072340A3/en · https://patents.google.com/patent/FR2948174A1/en

Confidence statement. I am confident that no single cited reference anticipates any claim (consistent with the Prior Art section on this page) and that the operative §103 combination is Rowe + DE 418,975 + Greenewalt. I am highly confident that claims 3 and 5 are obvious on that combination, because the extraction-geometry objection rests on the inventor's own express treatment of flat and cylindrical facets as alternatives. I have low confidence in the element-level mappings for claims 1, 2, 4 and 6, for two independent reasons: four claims are OCR-corrupted, and eight of the ten references remain un-retrieved. I have not manufactured any reference, disclosure, or motivation; where the record is silent — most importantly on the incandescent-globule point source and on remote-actuated ganged light guides — I have said so and left the claim standing rather than reaching for an unverified citation.