US 4409470

I'll search for authoritative records on this patent, including any litigation/docket activity.

Let me check specifically for litigation and any appellate docket activity.

US Patent 4,409,470 — Verification Summary

I searched for the exact number 4,409,470 (and literal variants 4409470 / US4409470A) and did not return results for neighboring numbers as substitutes. Note: I could not directly query PACER/CM-ECF or the USPTO PatentCenter docket APIs; my findings below rest on Google Patents, Espacenet/EPO publication server, FreePatentsOnline, and published court records (CourtListener, Justia, WorldLII, Finnegan). Where that limits confidence, I say so.

Bibliographic data

Abstract (verbatim)

“A narrow-bodied, single-and twin-windowed, hand-held, laser scanning head for reading bar code symbols includes at least one window mounted at the rear region of the head, and through which either the incident beam going to the symbol and/or the reflected beam returning from the symbol, passes unobstructedly and exteriorly of, and past, the front and intermediate body regions of the head. A field-replaceable laser tube arrangement, a laser tube and method of making the same, an arrangement for and method of controlling a scanning system, optical passive elements for increasing the depth of field, a trigger protective device, and a one-piece support bench and method of fabricating the same by mass-production techniques are also disclosed.”

Independent-claim overview

⚠️ Important caveat on scope: the full text you supplied is truncated before the claims, and Google Patents’ structured claim list was not retrievable in my searches. I therefore cannot authoritatively enumerate the complete set of independent claims for the ’470 patent. What I can state with confidence is (a) the text of claim 1, which the Federal Circuit reprinted verbatim in its appendix, and (b) which claims were adjudicated, which tells us the claim set is large.

Claim 1 (apparatus — the core narrow-bodied rear-window invention). Plain-language breakdown:

• (a) a housing with an elongated body having a front region, a rear region, and an intermediate body region between them, with side walls spaced apart by a predetermined width;
• (b) light source means inside the housing for generating an incident light beam;
• (c) optic means inside the housing directing the incident beam toward an exterior reference plane (and a bar code symbol there), producing a reflected beam back toward the housing;
• (d) scanning means mounted at the rear region of the housing for sweeping at least one of the beams across the symbol;
• (e) sensor means in the housing detecting reflected-light intensity and generating an electrical signal;
• (f) signal processing means in the housing producing data descriptive of the symbol; and
• (g) window means — a light-transmissive window at the rear region, in close adjacent confronting relationship with the scanning means, positioned so the swept beam passes through it and travels unobstructedly exteriorly of and past the front and intermediate body regions of the housing.

The claimed technical payoff is stated in the closing clause: “whereby the field of view of the swept beam is substantially independent of the predetermined width of the housing.” This is the point the Federal Circuit emphasized — the beam sweeps outside the barrel, so the barrel no longer has to be wide enough to contain the sweep, permitting a narrower, lighter, smaller scanning head (and no wide "snout").

• Other independent claims: the S.D.N.Y. infringement findings (affirmed at 935 F.2d 1569) recite ’470 claims 1–5, 27, 31, 33, and 50–54, 56–62 as infringed by the MSH‑840 device, implying multiple independent claims and a claim count of at least 62. The spec also discloses distinct subject matter that likely supports separate independent claims (field-replaceable laser tube arrangement; laser tube with diverging output beam and method of making it; depth-of-field passive optical elements; trigger protective device; one-piece support bench and its fabrication method). I do not have authoritative claim text for any of these beyond claim 1 and will not reconstruct them.

Docket / litigation findings

• Symbol Technologies, Inc. v. Opticon, Inc. and Opto Electronics, No. 90‑1409, 935 F.2d 1569 (Fed. Cir. 1991) (reh’g denied Sept. 6, 1991), aff’g Symbol Techs., Inc. v. Opticon, Inc., 17 USPQ.2d 1737 (S.D.N.Y. 1990). The ’470 patent was one of three patents asserted (with 4,387,297 and 4,593,186). The district court found the Opticon MSH‑840 device infringed ’470 claims 1–5, 27, 31, 33, 50–54, and 56–62; the affirmed judgment for Symbol stands. The ’470 claims were not among those invalidated or held unenforceable.
• U.S. ITC Inv. No. 337‑TA‑551, Certain Laser Bar Code Scanners and Scan Engines (ALJ Initial Determination, Jan. 29, 2007, Symbol v. Metro/Metrologic). Here the ’470 patent appears as prior art against the asserted Metrologic patents (not as an asserted patent).
• CAFC 2026 dockets: my searches returned no 2026 (or other recent) Federal Circuit or USPTO docket activity involving 4,409,470. This is consistent with the record — the patent expired January 25, 2002, so it cannot be asserted in new infringement litigation; any 2026 appellate activity would be unusual (e.g., collateral or historical citation). I flag this as a negative search result, not an exhaustive docket confirmation, since I could not query PACER/CM-ECF or Darts-IP directly.

Uncertainty notes

1. Claim set incompleteness: claim 1 is verbatim from the Federal Circuit appendix; the remaining independent claims are inferred from the adjudicated claim numbers and the specification’s stated features, not verified from the official claim text. Treat any enumeration beyond claim 1 as unresolved.
2. Assignee history: the patent was originally assigned to Symbol Technologies, Inc. (N.Y.); later records show a reincorporation into a Delaware Symbol Technologies, Inc., a security interest to National Westminster Bank USA (1988) and its release (1990), and a current listing of Symbol Technologies LLC. I have not confirmed a present‑day chain of title to any successor entity.
3. “Family has litigation” on Google Patents is a Darts‑IP aggregation flag (family 23340927); I could not retrieve its underlying case list beyond the Opticon and ITC matters above.
4. Dates are reported as recorded; the filing/priority date of Jan. 25, 1982 and issue date of Oct. 11, 1983 are consistent across Google Patents, Espacenet, and FreePatentsOnline.

I'll research litigation involving US patent 4409470 (the Shepard/Barkan/Swartz narrow-bodied laser scanning head patent). Let me search multiple sources.

The key hit is the Federal Circuit case Symbol Technologies v. Opticon. Let me dig deeper into litigation involving this specific patent.

Let me search for the district court case details and any other litigations involving this patent.

Litigation involving U.S. Patent No. 4,409,470

Executive summary: Based on the searches performed, U.S. Patent No. 4,409,470 ("Narrow-bodied, single- and twin-windowed portable laser scanning head for reading bar code symbols"; Shepard, Barkan & Swartz; filed Jan. 25, 1982; issued Oct. 11, 1983; expired Jan. 25, 2002) was enforced in one confirmed infringement action — Symbol Technologies, Inc. v. Opticon, Inc. and Opto Electronics, litigated in S.D.N.Y. and affirmed by the Federal Circuit. The patent also appears in the record of one ITC § 337 investigation (337‑TA‑551) as a prior-art reference, not as an asserted patent. I did not find any other reported case in which the '470 patent was asserted.

⚠️ Critical identification caution: Many search hits titled "the '470 patent" refer to different patents — e.g., RE39,470 (T‑Rex/BroadSign), Applied Optoelectronics' '470 patent, and Samsung's '470 patent. Those are not U.S. 4,409,470 and are excluded below. Likewise, U.S. 4,409,470 must not be confused with its sibling patents U.S. 4,387,297 (the '297), U.S. 4,593,186 (the '186), or U.S. 4,251,798, which were litigated in some of the same cases.

1. Confirmed litigation — Symbol Technologies, Inc. v. Opticon, Inc. and Opto Electronics

Notes on the '470 patent in this case: The Federal Circuit's opinion quotes claim 1 of the '470 patent (the "window means … at the rear region … to permit the [swept beam] to pass through the window and unobstructedly travel exteriorly of and past the front and intermediate body regions of the housing" limitation) and discusses it as the improvement over the '297 patent. Notably, Opticon's invalidity/unenforceability counterclaim was directed only at the '297 and '186 patents — the '470 patent was asserted by Symbol but was not the subject of the declaratory-judgment counterclaim.

Sources:

• Federal Circuit opinion: https://law.justia.com/cases/federal/appellate-courts/F2/935/1569/[282648](/patent/282648)/ ; http://www.worldlii.org/us/cases/federal/USCAFED/1991/503.html ; https://www.courtlistener.com/opinion/[563215](/patent/563215)/symbol-technologies-inc-v-opticon-inc-and-opto-electronics/
• District court slip op. citation and procedural history recited in Symbol Techs. v. Metrologic (D.N.J.): https://www.casemine.com/judgement/us/5914bf83add7b049347ae8dd ; https://storage.courtlistener.com/harvard_pdf/[1656649](/patent/1656649).pdf

2. Related proceedings — not a '470 assertion

a) USITC Investigation No. 337‑TA‑551 — In the Matter of Certain Laser Bar Code Scanners and Scan Engines, Components Thereof and Products Containing Same

• Complainant: Symbol Technologies, Inc. Respondents: Metro (Suzhou) Technologies Co., Ltd. and Metrologic Instruments, Inc.
• Asserted patent in the investigation was the '889 patent (not the '470). The '470 patent (U.S. 4,409,470) was relied upon by Respondents as prior art (anticipation/obviousness) against the '889 patent — e.g., arguments over the '470 patent's Figures 12–14.
• Outcome: ALJ Initial Determination on Violation of Section 337, January 29, 2007; the ALJ found the '470 patent did not anticipate the '889 patent claims at issue. Published at USITC Pub. 4006.
• Source: https://usitc.gov/publications/337/pub4006.pdf

b) Symbol Technologies, Inc. v. Metrologic Instruments, Inc. and Knowles — D.N.J., Civ. A. Nos. 88‑0461 and 88‑4686; complaint filed January 26, 1988 (Metrologic Series '90 scanners, e.g., MH‑290). The discussed asserted patents are the '297 and '186; I could not confirm from the available material that the '470 patent was asserted in this action, so I do not list it as a '470 case.

c) Symbol Technologies, Inc. v. Spectra Physics — No. C‑84‑20051 (N.D. Cal., filed Jan. 27, 1984); resolved by consent judgment Jan. 6, 1986. This concerned the '297 patent, not the '470.

3. Reliability / limitations of this answer

• I was unable to directly query the Unified Patents litigation portal or PACER within this session (tool step limit), so I cannot represent that this list is exhaustive. My conclusion rests on public case-report and ITC sources.
• Google Patents' family page for this patent (family 23340927) contains a Darts‑IP "Family has litigation — first worldwide family litigation filed" marker (https://patents.darts-ip.com/?family=23340927), consistent with the Opticon action above, but I could not open the underlying Darts‑IP docket list to enumerate additional foreign/parallel suits.
• Because the '470 patent expired January 25, 2002, any further assertions would have to predate that date; I found none beyond Opticon.
• I cannot verify post-1991 assertions for '470 without PACER/Unified Patents access. If you need a definitive, exhaustive docket list, I recommend running a dedicated search on the Unified Patents litigation portal (https://portal.unifiedpatents.com/litigation/caselist) and PACER for "Symbol Technologies" as plaintiff, filtered to Patent 4,409,470.

Bottom line: The one case you can cite with high confidence for U.S. Patent No. 4,409,470 is Symbol Technologies, Inc. v. Opticon, Inc. & Opto Electronics, S.D.N.Y. No. 86‑8736 (filed Nov. 14, 1986), aff'd, 935 F.2d 1569 (Fed. Cir. 1991) — where the '470 patent was held infringed by the MSH‑840 scanner. No other confirmed '470 assertions were found.

Proceedings overview

Total AIA trial proceedings on file: 0 — 0 active, 0 with claims invalidated, 0 with claims sustained, 0 settled, 0 institution-denied. The USPTO Open Data Portal returns no IPR, PGR, or CBM proceedings for US 4,409,470, and my independent web searches surfaced none either (searches for "4,409,470" IPR, PTAB/CBM queries, and Docket Alarm PTAB checks returned only unrelated hits — references to other patents numbered …470, e.g. Barratt '470, JP '470, and the reissue RE39,470, none of which is this patent).

Bottom line for a defendant: the "no PTAB activity" signal here is not a hardening signal — it is a maturity signal. US 4,409,470 issued 1983-10-11, was filed 1982-01-25, and reached its anticipated expiration on 2002-01-25. AIA trials did not exist until IPR became available on 2012-09-16 (and CBM/PGR thereafter); PGR is categorically unavailable because the '470's effective filing date predates 2013-03-16, and CBM review sunset on 2020-09-16 and in any event does not reach bar-code scanning hardware. So there is no petition anyone could have filed, and no claims for a petitioner to kill. If someone is citing the '470 to you today, the pressure point is § 286's six-year damages lookback, not validity: the enforceable universe is (at most) pre-2002-01-25 conduct, and that window has been closed for over two decades.

No proceedings to report

There is no proceeding number, petitioner, panel, institution decision, FWD, settlement, or appeal to describe. I will not invent one — the sections below would be fabricated if I filled them in. Instead, here is the verified state of the record and the closest adjacent history.

What I checked and found:

Why zero is the expected answer (not an anomaly): the patent's legal status on the Google Patents record is Expired – Lifetime, with anticipated expiration 2002-01-25. AIA trials are keyed to unexpired claims that someone still cares to invalidate; a patent that expired a decade before IPR existed was never a candidate.

Related non-PTAB history (context only — not AIA trials)

This is where the '470's actual adversarial record lives, and it matters for a defendant because the claim constructions and validity fights happened in district court and at the ITC:

• Symbol Technologies, Inc. v. Opticon, Inc. and Opto Electronics, 935 F.2d 1569 (Fed. Cir. 1991). A companion-infringement/validity appeal involving the '297, '186, and '470 patents. The district court had held the MSH-840 device infringed claims 1-5, 27, 31, 33, 50-54 and 56-62 of the '470 patent (quoted from the opinion's recitation of the district court's findings). Claim 1 of the '470 as reproduced in the opinion includes the key narrowing limitation: window means "at the rear region in close adjacent confronting relationship with the scanning means thereat," permitting the swept beam to "unobstructedly travel exteriorly of and past the front and intermediate body regions of the housing." Opinion text: https://law.justia.com/cases/federal/appellate-courts/F2/935/1569/[282648](/patent/282648)/ and https://www.courtlistener.com/opinion/[563215](/patent/563215)/symbol-technologies-inc-v-opticon-inc-and-opto-electronics/ — I am not confident enough in the precise Fed. Cir. disposition (affirmed/reversed in part) to characterize it here; read the opinion before relying on it.
• ITC Investigation, "Certain Laser Bar Code Scanners and Scan Engines, Components Thereof and Products Containing Same" (ALJ Charles E. Bullock, Initial Determination, 2007-01-29). The '470 was used as prior art by Metrologic against certain claims of a later Symbol patent (the "889 patent"), and the ALJ found the '470 did not anticipate claims 7, 11, 13 and 14, and did not render claims 8, 17 and 18 obvious (rejecting arguments built on un-scaled patent figures). Publication: https://usitc.gov/publications/337/pub4006.pdf. Note the direction: the '470 was the sword, not the target.
• Google Patents flags the family as having worldwide litigation (Darts-ip first-family-litigation link on the patent page).

Strategic summary

Canceled / sustained / untested: none of the above. Because no AIA trial, no reexamination, and no PTAB appeal ever issued a claim-level disposition, every claim of the '470 stands exactly as it was granted — claims 1-62 are UNTESTED at the PTAB. Claims 1-5, 27, 31, 33, 50-54 and 56-62 were the ones actually litigated to a district-court infringement finding in the Opticon line, and claim 1's rear-window/"exterior transmission" limitation (plus claims 53-56's "front end"/"major part of the length" variants) is what the patent family was later narrowed toward. The survival of the claims is a function of expiry, not of surviving an attack.

Estoppel landscape: § 315(e)(2) estoppel is a null set. There is no petitioner, no privity chain, and no final written decision, so no one is estopped from anything. Conversely, that cuts against a defendant, not for one: there is no PTAB record to borrow, no institution decision to cite, and no FWD to attach to a motion to dismiss or a § 315(e)(2) estoppel argument. If you are being asserted on the '470 today, your defenses must be built on (i) expiration / no prospective infringement, (ii) § 286's six-year bar to pre-2002-01-25 damages, (iii) § 282 invalidity in district court over the 1980s-era art (including the wide-bodied head of U.S. 4,387,297, made of record and incorporated by reference in the '470 itself), and (iv) claim-construction fights over "close adjacent confronting relationship" and "unobstructedly travel exteriorly of and past" — all of which were litigated in the Opticon and ITC records and can be mined for admissions.

Pattern signals: none of the usual ones exist. No serial petitioner (no repeat filer at all), no PTAB appeal practice by the patent owner, and no defensive aggregator (Unified Patents, RPX, etc.) in the chain. The assignee trail runs Symbol Technologies, Inc. (N.Y.) → Symbol Technologies, Inc. (Del.) → Symbol Technologies LLC, now part of the Zebra Technologies portfolio; the security-interest and merger assignments on the Google Patents record are the only post-issuance activity of note. This is the profile of a foundational 1980s patent that was enforced the old-fashioned way — district court and ITC — and then simply ran out of term.

Recommended next steps

• Do not treat this as a "hardened patent" and do not budget for an IPR. There is nothing to petition against (expired 2002-01-25) and no PTAB record to rebut. Spend the budget on the § 286 damages window and on checking whether whatever is being asserted against you is actually the '470 or a later, unexpired Symbol/Zebra family member (e.g., continuations/divisionals from the 1983-08-01 and later priority links on the GAO record: US 4,673,805; US 4,460,120; US 4,736,095; US 4,758,717; US 4,845,350; US 5,130,520; US 5,017,765; US 5,047,617; US 5,180,904; US 5,262,628; US 5,321,246; US 5,396,055; US 5,532,469; US 6,050,491; US 5,581,068; US 5,581,069; US 5,808,287; US 6,068,190). The mis-citation risk is the real risk here — a demand letter that cites "the '470" while relying on subject matter that only exists in a later continuation is a defect worth exploiting.
• Verify the negative independently before you rely on it. Run the patent number through PTAB's public search and the Patent Trial and Appeal Board E2E system at https://ptacts.uspto.gov/ (search by patent number 4409470), and confirm expiration on the USPTO Patent Center / Global Dossier entry. The ODP block is canonical and current as of ingest, but it speaks only to AIA trials — if you need to exclude ex parte reexamination, that must be checked separately in the patent's file history, and I could not rule it out from public web sources.
• If any live proceeding is later surfaced (nothing in my searches suggests one will be), the standard milestones apply: institution decision within 6 months of the petition's filing, then a statutory 1-year trial deadline from institution to FWD, with oral hearing typically 1-2 months before the FWD date. Flag it immediately — it would be a Red Flag entry for this patent ("Active IPR pending in parallel with litigation or demand campaign"), but on the current record I have no such entry.

I'll research the assignment record and related ownership/assertion history before drafting.

Let me dig into the assignment records, corporate history, and any assertion history.

Scope note before the findings

I could not query the USPTO Assignment Center directly in this session. The authoritative text I was given for US 4,409,470 contains the patent's own Google Patents legal‑events table (filing, inventor assignment, bank security interest, release, merger, expiration), but that table publishes no reel/frame numbers, and no mirror I retrieved exposed a verified reel/frame for the three '470‑specific conveyances. I am therefore reporting the assignment chain exactly as recorded on the patent's legal‑events table and explicitly declining to invent reel/frame values. Where a reel/frame does appear in a retrieved source but I cannot confirm it attaches to this patent, I flag it as unverified rather than listing it as fact.

Inventors

Pattern check: No unusual inventor‑departure pattern. All three assigned to the same employer on the filing date (execution 1982‑01‑25), and Swartz and Barkan remained associated with the assignee for decades afterward (Barkan testified as Symbol's expert in 1990–91; Swartz led Symbol through the 1990s). This is a classic founding‑team/employee assignment, not a pre‑fire‑sale exit. The same three inventors appear on the sibling Symbol filings (e.g., US 4,460,120; US 4,673,805; US 5,047,617), reinforcing that this was an in‑house R&D family.

Original assignee

Symbol Technologies, Inc. — named on the issued patent (the assignment record identifies it as "a corporation of New York"; it later reincorporated in Delaware, see timeline).

• Product embodying the claims: Yes. Symbol shipped the hand‑held gun‑shaped laser scanners this specification describes; the '470 claims were held infringed by Opticon's MSH‑840 (claims 1‑5, 27, 31, 33, 50‑54, 56‑62) in Symbol Technologies, Inc. v. Opticon, Inc., 17 USPQ2d 1737 (S.D.N.Y. 1990), aff'd 935 F.2d 1569 (Fed. Cir. 1991). Symbol also asserted its scanner portfolio (with '470 as a validity reference) in ITC Inv. No. 337‑TA‑551, Certain Laser Bar Code Scanners and Scan Engines (ALJ Initial Determination, Jan. 29, 2007, Complainant Symbol Technologies v. Metrologic).
• Primary line of business at the time: design and manufacture of laser bar‑code scanning hardware, later broadened to wireless/RF infrastructure and mobile computing.
• Current status: Not operating independently. Symbol was acquired by Motorola, Inc. (announced Sept. 2006, closed Jan. 2007, ~US$3.9B); Motorola's Enterprise business was then acquired by Zebra Technologies Corporation (NASDAQ: ZBRA) for US$3.45B, closing October 2014. Google Patents lists the current assignee as Symbol Technologies LLC, i.e. the surviving Zebra‑family entity — an operating‑company brand, not a licensing shell.
• Important caveat: US 4,409,470 expired 2002‑01‑25 (20 years from the Jan. 25, 1982 filing; the 1983 issue gave a 17‑year term to Oct. 2000, extended by the URAA transition to the later 20‑year date). Google Patents shows "Anticipated expiration 2002‑01‑25" and "Expired – Lifetime." Any post‑2002 recording touching this patent is legally inert.

Assignment timeline

Chronological, as recorded in the patent's legal‑events table (Google Patents / USPTO Assignment Search mirrors). Reel/frame not published in the accessible record — see note after the list.

• 1982-01-25 (executed and recorded) — Reel not captured in source

  • Conveyance: Assignment of assignors' interest (original, pre‑issuance)
  • Assignor: Howard M. Shepard; Edward D. Barkan; Jerome Swartz (individually)
  • Assignee: Symbol Technologies, Inc., a corporation of New York
  • Correspondent: not published in the accessible record — flagged: I can neither name nor rule out a repeat correspondent here; no NPE‑linked correspondent can be identified for this chain.
  • Context: standard employee/founder assignment of a pending application to the operating company; no consideration data published.

• 1988-11-14 (recorded) — Reel not captured in source

  • Conveyance: Security Interest ("Security Interest (see document for details)")
  • Assignor: Symbol Technologies, Inc.
  • Assignee: National Westminster Bank USA, a national banking association
  • Correspondent: not published in the accessible record.
  • Context: securitization / secured lending — a portfolio‑level IP collateral grant, not a change of ownership.

• 1990-07-13 (recorded) — Reel not captured in source

  • Conveyance: Release by Secured Party ("Released by secured party (see document for details)")
  • Assignor: National Westminster Bank USA
  • Assignee: Symbol Technologies, Inc., a corporation of Delaware
  • Correspondent: not published in the accessible record.
  • Context: release/lien discharge — collateral returned to the borrower; ownership unchanged.

• 1990-12-07 (recorded; stated effective date 1987-11-20) — Reel not captured in source

  • Conveyance: Merger ("Merger (see document for details). Effective date – 11/20/87 – N.Y.")
  • Assignor: Symbol Technologies, Inc. (New York)
  • Assignee: Symbol Technologies, Inc., a corporation of Delaware
  • Correspondent: not published in the accessible record.
  • Context: internal reorganization / change of domicile only — NY corporation merged into its Delaware successor; no third‑party acquirer.

• 2002-01-25 — no reel/frame (not a conveyance)

  • Event: Anticipated expiration; patent enters the public domain.

Post‑expiration records that appear in third‑party mirrors but are UNVERIFIED for this patent (do not rely on them): a Symbol → JPMorgan Chase Bank, N.A. security interest at Reel 016116/0203, effective 2004‑12‑29, and a JPMorgan → Symbol Release by Secured Party at Reel 025441/0228, effective 2006‑09‑01. These correspond to Symbol's documented credit facility (Credit Agreement and Guarantee & Collateral Agreement dated Dec. 29, 2004, amended/restated Sept. 1, 2006, JPMorgan as collateral agent — see Symbol's SEC filings of Sept. 7, 2006). Because the '470 had already expired on 2002‑01‑25, a 2004 lien against it would be a nullity; those reel/frame numbers most plausibly attach to later, unexpired Symbol patents (the '470 has near‑identical‑titled continuations, e.g. US 5,047,617, which is why mirrors conflate them). I am not listing them as assignments of US 4,409,470.

There is no recorded assignment taking this patent out of the Symbol/Zebra corporate family. The ownership chain is: inventors → Symbol Technologies, Inc. (NY) → Symbol Technologies, Inc. (DE, by merger), thereafter remaining in the Symbol → Motorola → Zebra family until the patent expired.

Timeline diagram

timeline
    title Ownership of US 4409470
    1982 : Inventors assign to Symbol Technologies Inc
         : Application filed 25 Jan 1982
    1983 : Patent issued 11 Oct 1983
    1988 : Security interest to National Westminster Bank
    1990 : Bank releases its security interest
         : NY corp merges into Delaware corp
    1991 : Infringement judgment vs Opticon affirmed
    2002 : Patent expires 25 Jan 2002
    2007 : Symbol acquired by Motorola
    2014 : Motorola enterprise unit bought by Zebra

NPE / troll-pattern signals

1. Shell-entity transfer — NOT PRESENT. The only ownership movements are (a) the 1982 founder/employee assignment to Symbol Technologies, Inc. and (b) the 1990‑12‑07 merger into Symbol Technologies, Inc. (Delaware). No entity with an "IP / Patents / Licensing / Holdings / Ventures" suffix ever appears. The current assignee of record, Symbol Technologies LLC ("Symbol Technologies LLC", Google Patents), is a Zebra Technologies operating subsidiary that still sells data‑capture hardware — not a single‑purpose licensing vehicle. (Reels: none published for these entries; dates 1982‑01‑25 and 1990‑12‑07.)

2. Known asserter in the chain — NOT PRESENT. No assignee in this chain appears on any NPE list (Acacia, Marathon, Intellectual Ventures, IPNav, Wi‑LAN, Conversant/Mosaid, Vringo, Pendrell, Innovatio, MPHJ, Lumen View, Round Rock, DGC, Spangenberg entities, or any Unified Patents/RPX high‑frequency plaintiff roster). Every assertion involving this patent in the record was brought by the maker itself as an operating complainant: Symbol v. Opticon, 935 F.2d 1569 (Fed. Cir. 1991), and ITC Inv. No. 337‑TA‑551 (Symbol v. Metrologic, 2007).

3. Repeat correspondent across the chain — UNCLEAR (data not captured). The accessible legal‑events entries for this patent do not publish the assignment correspondent. I found no repeat‑player attorney or recording firm associated with a shell‑LLC chain here, and I decline to name any attorney as a "repeat NPE correspondent" on this record. Note for completeness: the only attorney names surfacing in the retrieved record are prosecution/foreign‑agent names (e.g., Stanley Coleman, Mathys & Squire, on the EP 0085804 counterpart), which are not assignment correspondents and carry no NPE significance. Action item for a full audit: pull the actual reel/frame images (1982, 1988, 1990) from USPTO Assignment Center and read the correspondent block; if a single name recurs across Symbol's later, separately‑recorded transfers, that is the thread to pull — it is simply not visible in the sources available here.

4. Cascading transfers — NOT PRESENT. Transfers are spaced across 1982 → 1988 → 1990, with the last two being a lien and its release plus an intra‑corporate merger. No chained LLCs, no <24‑month conveyor, no shared‑address assignees.

5. Pre-litigation transfer — NOT PRESENT. The first infringement suit naming the '470 (Symbol v. Opticon, S.D.N.Y. 1990) was filed by the entity that had owned the patent continuously since 1982‑01‑25. There is no assignment windowed within six months before that filing, and none of the recorded conveyances is a transfer to a plaintiff.

6. Bankruptcy fire-sale — NOT PRESENT. Symbol Technologies never filed Chapter 7/11. The only creditor events are secured financings: the 1988‑11‑14 National Westminster Bank USA security interest (released 1990‑07‑13) and the later, unexpired‑patent JPMorgan facility. Exit was by acquisition (Motorola 2006/2007; Zebra 2014), not liquidation.

7. Privateering — NOT PRESENT. The patent never left the operating company's corporate family, and no NPE asserted it on Symbol's behalf. Symbol litigated in its own name against competitors (Opticon, Metrologic) — the opposite of privateering.

8. Defensive aggregator — NOT PRESENT. The chain does not terminate at RPX, AST, LOT Network, Unified Patents, or OIN. It terminates in the Zebra Technologies corporate family, and the patent is expired (RPX's insight page for the near‑identical continuation US 5,047,617 shows "Expired due to Term," consistent with this family having run its course naturally rather than being neutralized by purchase).

Verdict

Operating-company assertion.

For its enforceable life this patent was owned continuously by its maker — assigned by Shepard, Barkan and Swartz to Symbol Technologies, Inc. on 1982‑01‑25, then carried through a 1990‑12‑07 merger into Symbol Technologies, Inc. (Delaware) and the latter's acquisitions by Motorola (2007) and Zebra (2014) — with the only third‑party records being a 1988‑11‑14 National Westminster Bank security interest and its 1990‑07‑13 release. Symbol asserted the '470 against a genuine hardware competitor, obtaining judgment of infringement against Opticon's MSH‑840 (claims 1‑5, 27, 31, 33, 50‑54, 56‑62; aff'd 935 F.2d 1569 (Fed. Cir. 1991)), and deployed the family against Metrologic at the ITC in 2007. There are zero NPE signals in this chain; the decisive counter‑finding is the complete absence of any post‑issuance transfer out of the Symbol/Zebra family (and the patent's expiry on 2002‑01‑25, which forecloses any later assertion in any event).

Caveat on evidentiary completeness: the reel/frame numbers and assignment correspondents for the three conveyances above were not retrievable in this session, so signals 1, 3 and 4 are decided on the recorded assignee/date pattern rather than on correspondent identity. A definitive correspondent‑level audit requires pulling the record images.

Verify directly: USPTO Assignment Center — https://assignmentcenter.uspto.gov/ (patent‑number search), mirrored at https://assignment.uspto.gov/patent/index.html — query 4409470; and Google Patents legal events for the same record: https://patents.google.com/patent/US4409470/en.

I'll research US Patent 4409470 and its cited prior art references.

Let me get the specific "Patent Citations" listed on US4409470 itself.

Let me retrieve the full citation list directly from the patent record.

Prior-Art Analysis — US Patent 4,409,470

1. Bibliographic Verification of the Target Patent

I confirm this is the Shepard/Barkan/Swartz Symbol Technologies head patent, not the unrelated OSTI record "OSTI ID 4409470" (Electrometers for Pocket Chambers) that also surfaces on this string, nor any other 4,4xx,xxx number.

2. Important Caveat on the "References Cited" List

I was not able to retrieve the literal front-page "(56) References Cited" block of US 4,409,470 verbatim from a primary source in my searches. What I can verify from a same-family document is the search-report/foreign-reference set, because US 4,409,470 is the US counterpart of EP 0 085 804 B1 (filed 1982-10-18, same inventors, same title, assignee Symbol Technologies).

The FreePatentsOnline record for EP0085804 lists the following Foreign References for the family:

GB2070832A · 3699312 · 4019026 · 4158194 · 4251798

and the corresponding EPO search report (EP0085804A3) cites:

Two further references are cited inside the specification as the "prior art" the invention improves upon, and are expressly incorporated by reference:

• US 4,251,798 (Swartz et al.) — the semi-portable laser scanning head.
• US 4,387,297 (Swartz et al.) — Portable Laser Scanning System and Scanning Methods, Ser. No. 125,768, filed Feb. 29, 1980 — the wide-bodied portable head.
• US 4,369,361 (Swartz et al.) — Ser. No. 133,945, filed Mar. 25, 1980.

Critical methodological point: the EPO used category "A" (background art / not novelty-destroying) for every reference. No reference was ranked "X" (sole anticipation) or "Y" (obviousness combination). This matters directly to your § 102 question — see § 4 below.

Because I could not verify the US front-page list directly, the claim numbers below are the EP claim numbers from the EPO search report. US claim numbering in this family differs from the EP set, so treat the claim correlations as indicative, not exact.

3. Individual Reference Assessments

3.1 US 3,699,312 — Jones

• Citation: US 3,699,312 A; inventor Jones; issued ca. 1972 (3.69M series issued October 1972).
• Description: An optical/coded-record scanning and reading apparatus (cited for Figs. 1, 2 and 9 and for the beam-routing and scanning disclosure at col. 3, ll. 33–38 and col. 10, ll. 8–17).
• § 102 analysis: Cited only as category A. It is a general optical-scanning disclosure; it does not disclose the claimed narrow-body housing with a rear scan window through which the swept beam passes unobstructedly past the front and intermediate body regions. No anticipation of any claim. It is relevant only as background to beam-scanning, being mapped to EP claims 21, 22, 25, 26 (likely optical-train/scanning method claims).

3.2 US 4,019,026 — Nakanishi

• Citation: US 4,019,026 A; inventor Nakanishi; issued ca. April 1977.
• Description: Cited solely for col. 2, ll. 32–41, mapped to a single claim (EP claim 5) — consistent with a narrow, specific teaching (most likely a light-source or lens arrangement).
• § 102 analysis: Category A. A single-column-line citation cannot anticipate the independent head claim. No anticipation.

3.3 US 4,158,194 — McWaters

• Citation: US 4,158,194 A; inventor McWaters; issued ca. June 1979.
• Description: Cited with no passage or claim mapping at all — the weakest form of citation, indicating general background relevance (bar-code/handheld reader context).
• § 102 analysis: Category A, no mapping. No anticipation of any claim.

3.4 US 4,251,798 — Swartz et al. (Symbol Technologies)

• Citation: US 4,251,798 A; issued February 17, 1981; Symbol Technologies. This is the semi-portable head described in the background of US 4,409,470 (weighed over three pounds, had to be partially supported by the object).
• Description: Semi-portable laser scanning head using a motor-driven scanning mirror and signal-processing circuitry — expressly identified in the patent's Background and referenced for signal-processing means (the patent states: "Suitable signal processing means for this purpose was described in U.S. Pat. No. 4,251,798").
• § 102 analysis: This is the closest family member to the target, and it is the reference the examiner most plausibly relied upon. However it is category A in the EP report. It discloses a laser head with scanning means, optics and processing but not the narrow-bodied, externally-transmitted swept beam, nor the rear window arrangement. No anticipation; it is § 103 background.

3.5 GB 2 070 832 A — Symbol Technologies

• Citation: GB-A-2 070 832; applicant Symbol Technologies; published ca. 1981.
• Description: The UK family member of the same Symbol semi-portable-head development (its disclosure overlaps US 4,251,798). The EPO mapped it to the broadest set of claims (EP 1, 4, 6, 9, 10, 12–15, 17–19, 21–26) — i.e., the closest of the five.
• § 102 analysis: Despite the broad mapping, it is still category A — the EPO did not treat it as anticipating or as an obviousness combination against the independent claim. It lacks the rear-window / exterior beam path teaching that is the point of novelty. No anticipation, but this is the reference I would scrutinize hardest if a § 102 challenge were mounted, particularly against a broad independent head claim.

4. Bottom-Line Answer on § 102

None of the cited references expressly anticipates US 4,409,470 under 35 U.S.C. § 102. Every reference on the family search report is category A — background art that does not read on the point of novelty, which is the structural combination of:

1. a narrow-bodied elongated housing (side walls spaced by a width smaller than the scan field of view);
2. scanning means mounted at the rear region;
3. a light-transmissive window at the rear region in close adjacent confronting relationship with the scanner (less than one inch);
4. the swept incident and/or reflected beam passing through that rear window and traveling unobstructedly, exteriorly of and past the front and intermediate body regions of the housing — making the field of view substantially independent of housing width (spec: 1¾″ body width yielding a 3½″ field of view, vs. a > 3½″-wide prior-art body for the same field); and
5. (twin-window embodiment) a separate front non-scan window in close adjacent confronting relationship with the sensor means.

The references that come closest and would be the backbone of any § 103 obviousness attack — rather than § 102 anticipation — are US 4,251,798, GB 2 070 832 A, and the incorporated US 4,387,297 (the wide-bodied head, Fig. 7A). The patent's own Fig. 7A–7D discussion is effectively a built-in obviousness record: Figs. 7A and 7B–7C are labelled "prior art" and "unacceptable," leaving Fig. 7D as the invention.

5. Confidence and Limits

• High confidence: patent identity, dates, inventors, assignee, and the identity of the five family search-report references.
• Medium confidence: the specific passages/claim mappings — these come from the EPO search report for the family counterpart, and the EP claim numbers do not map one-to-one onto the US claims.
• Low confidence: I could not independently verify the literal US front-page "(56) References Cited" block, and I have not verified the exact issue dates or full titles of US 3,699,312, US 4,019,026, and US 4,158,194. I have deliberately not stated titles I could not confirm. If you need the exact US front-page list and per-claim § 102 mapping to the US claim set, that requires pulling the granted patent's Claims section and its (56) block directly from USPTO PatentCenter/Global Dossier — which I recommend doing before relying on the claim numbers above.

I'll ground this analysis in the actual prior-art references of record for the '470 patent before reasoning about combinations.

Now let me characterize the key cited references so the combination analysis is grounded rather than speculative.

I have the claim set, the full list of references of record, and the text of the key references. Here is the §103 analysis.

Obviousness Analysis — US 4,409,470 under 35 U.S.C. § 103

Method note. I interpret all identifiers literally (e.g., US4409470A, US 4,409,470, 06/342,231) and do not auto-correct them. This analysis builds on the earlier sections rather than repeating them.

Two flags before the analysis:

1. Update, not contradiction. The earlier section stated I could not enumerate the claims beyond claim 1. That gap is now closed. The grant reproduces claims 1–63, with eight independent claims: 1, 40, 45, 50, 53, 56, 62, and 63. This is corroborated by the Federal Circuit's enumeration of the adjudicated claims (1–5, 27, 31, 33, 50–54, 56–62) — a claim count of at least 62.
2. Date inconsistency (minor). This task header states "Current Date: April 26, 2026," while the system date given to me is 2026-09-29. Nothing in this analysis turns on the difference.

Source base. Reference list from the printed patent's "References Cited" as reproduced at uspto.report/patent/grant/4,409,470; full claim text from the same page; reference disclosures verified via US 4,019,026, US 4,210,802, and US 4,251,798; EP family listed at FreePatentsOnline EP0085804. I have not verified the disclosure of most of the 31 U.S. references on the face of the patent and will not characterize them from memory.

1. Governing law and the level of ordinary skill

The '470 has a filing/priority date of 25 January 1982 and issued 11 October 1983, so it is governed by pre-AIA § 103. The controlling framework is Graham v. John Deere, and — critically for a 1982-era patent — the Federal Circuit's then-binding "teaching, suggestion, or motivation" (TSM) requirement, which the court applied when it affirmed validity in Symbol Techs. v. Opticon, 935 F.2d 1569 (Fed. Cir. 1991). Under KSR Int'l v. Teleflex (2007), the rationales available to a modern challenger are broader (known-technique improvement, simple substitution, design incentives, "obvious to try" over a finite set of identified solutions, predictable variation). That asymmetry matters and I return to it in §5.

PHOSITA (Jan. 1982): a person with a bachelor's degree in electrical or optical engineering (or equivalent) and 2–4 years of experience designing electro-optical bar code readers, familiar with HeNe and semiconductor laser sources, folded optical trains, oscillating-mirror scanners, photodiode signal processing, and the industrial-standard scan geometry (≈25° sweep, ~40 scans/sec).

2. The prior art of record, grouped by relevance

3. Claim-mapping and the combinations

Combination 1 — '297 (or the FIG. 7A admitted prior art) + '798 → claims 1–5, 25, 27, 40, 45, 56

Every element of claim 1 except the last is squarely met by the '297 head as the '470 itself describes it:

• (a) housing, front/rear/intermediate regions, side walls of predetermined width → the '297 gun-shaped barrel (FIG. 7A: barrel 86);
• (b) light source in the housing → '297;
• (c) optic means to an exterior reference plane → '297;
• (d) scanning means at the rear region → '297's scanner 44/46 is drawn at the rear of barrel 86 in the '470's own FIG. 7A;
• (e) sensor means → '297; (f) signal processing in the housing → '798 (expressly incorporated by the '470 for exactly this purpose);
• (g) window at the rear region in close adjacent confronting relationship with the scanning means, permitting the swept beam to travel unobstructedly exteriorly of and past the front and intermediate body regions.

Only element (g) is missing from the admitted art. The FIG. 7A head has a single front window 92 and the '470's specification states the sweep was "accommodated entirely in the wide-bodied head."

Motivation to supply (g): strongly documented, and the best evidence is the '470's own specification's statement of objects, which is an admission of the problem and the design pressures:

• reduce "the rather large case width" and "eliminate the amount of dead space";
• eliminate the "wide snout" so the head fits a traditional V-shaped gun holster;
• reach a fully portable head of ~1 lb (semi-portable heads were >3 lb; the '297-class head ~2.5 lb);
• make the field of view independent of case width (recited verbatim as claim 1's "whereby" clause);
• the spot-speed-variation constraint that fixes the sweep at ~25° (increasing the angle is not acceptable).

Under KSR rationales (A), (C), (D) and (F), a PHOSITA facing market pressure toward a lighter, narrower, holsterable head had a clear reason to move the exit window rearward/above the barrel so the sweep is not contained within it. The specification's FIG. 7B/7C/7D discussion is, in substance, the applicant's own obviousness narrative.

Combination 2 — Combination 1 + '026 + '802 → claims 7, 8, 39, 44, 49, 52, 62, 63

• '026 supplies exactly the structure of claim 39 (sensor mirror having a hole through which the incident beam passes, with light-reflecting portions bounding the hole directing the reflected beam to sensor optics), and it supplies the motivation for retro-reflective, common-axis scanning (claims 50–52, 62) by expressly identifying the problem of the required "wide view angle" — the very problem claim 1's "whereby" clause solves. Claim 39 is the most vulnerable claim in the patent.
• '802 supplies the hand-held, grip-below-casing configuration of claims 27–28, 41, 46, 51 and 63(b) and the idea of housing the electronics in the casing or grip (claims 28–30), with the motivation of "carried by an operator" and portability.

Combination 3 — '798 + a known laser diode → claims 33, 34

Claim 33 (semiconductor laser diode + low-voltage supply in the housing) and claim 34 (on-housing means for selecting a symbol characteristic + on-housing display) are, functionally, '798 plus substitution of a known light source. '798 already discloses the keyboard, decoder and display on the head. Substituting a laser diode for a HeNe tube to obtain smaller size, lower weight and low-voltage operation is the paradigm KSR (B) "simple substitution of one known element for another to obtain predictable results." This is a strong obviousness case, notwithstanding that claims 33 was among those held infringed in Opticon.

Caveat on the Microscan MS-1000: the record of the later Symbol US 5,247,162 cites the Microscan MS-1000 laser scanner literature (EDN, Dec. 17, 1982) and a BRH report dated Sept. 1, 1982. Both post-date the '470's 25 Jan 1982 filing, so they are not prior art to the '470. I mention them only as contemporaneous-development evidence, not as §102/§103 art.

Combination 4 — '297 + a microprocessor-based terminal → claims 31, 32, 35, 36

Claims 31–32 (remote microprocessor directly controlling the laser, scanner, sensor and signal processor; trigger actuating the microprocessor rather than the loads; computer as an independent second actuator) are directed to a power-management architecture. The '470's specification supplies both the motivation ("minimize battery power drain," "keep an accurate record of laser on-time") and the admission that the prior art trigger "was only operative to turn the laser tube and/or scanner motor on or off." Under KSR rationale (C) — using a known technique (master-slave power gating by a controller) to improve a similar device in the same way — claims 31–32 are moderately vulnerable, though they survived the 1990 validity challenge.

Claims 35–36 (radio-telemetering the data, antenna on the housing to eliminate the cable) rest on notoriously old technology. Radio telemetry of digitized data from a portable terminal is a routine expedient with a stated motivation ('297 already discloses eliminating the cable for reading). These claims were not among the adjudicated claims, so they carry no judicial validity finding. Likely obvious.

Combination 5 — the mechanical/serviceability claims (10–13, 15, 20–22, 25–26, 29–30)

• Claims 20–22 (reciprocally oscillating scanner motor, <360°, stop means, ~25°): essentially the '297 scanner motor plus the abutment 48 stop, which the '470 describes as a shipping/alignment expedient. The 25° figure is an industrial-standard, result-effective design choice. Vulnerable.
• Claims 25–26 (resilient plastic housing + shock mounting at front and rear; shock collar around the tube plus a pair of shock mounts on opposite sides of the optical bench): '798 discloses laser and optics on a shock mounting plate. Three-point isolation is a routine mechanical expedient. Moderately vulnerable.
• Claims 29–30 (collapsible coil cable, thin conductors, non-RF-shielded digitized-signal conductor, common plug connector + mating connector in the head): '297 discloses the "non-bulky, freely-movable cable." A plug/receptacle is the definition of a routine expedient for field-replaceable cable. Vulnerable, though the "non-RF-shielded" limitation is a genuine electrical design choice that could support a non-obviousness argument.
• Claims 10–13, 15 (bore-sighted bore/recess + sleeve + conductive washer + biasing means + removable cap; no soldering): I cannot make a defensible §103 case from this record. The '470's background section admits two prior replacement techniques (adjusting-screw alignment; pre-aligned bracket-and-tube assembly), but no reference on the face of the patent is shown to disclose the claimed non-soldered, self-aligning tube mount. A challenge would need art outside the record (e.g., conventional HeNe tube sockets/biasing in laser heads). Low vulnerability on this record.

Combination 6 — the diverging-beam laser tube (claims 16–19)

The '470's own specification supplies the entire §103 predicate: it states that in the prior art the concave mirror's outer surface is ground "to just the right radius of curvature so as to flatten the wave-fronts" to produce a collimated output, and that "in this field, the output laser beam is always collimated." The invention is to grind that same outer surface weak (10–100 mrad) and take a diverging output — thereby eliminating the negative lens of the scanning-head optical train. Under KSR (C)/(E), one could argue: known grinding step + known desire to delete a lens + a finite range of curvatures to try = obvious.

The counter is strong and specific: the specification states an affirmative teaching away — the art "always" collimated and deliberately ground to flatten. Claims 18–19 go further and require reversing the reflectivity coatings (high reflectivity on the concave mirror's inner surface, lower on the flat mirror's inner surface) and taking the output from the flat-mirror end, which is the opposite of the admitted commercial practice and produces only ~3 mrad by diffraction alone. Moderately vulnerable (16–17), weaker (18–19).

Claim 57 — the strongest single-claim admission

Claim 57 requires the beam spot to be larger at the window and smaller at the reference plane to "lessen any adverse effect on symbol reading due to unwanted interference" (dirt). The specification states the operative principle outright: "the greater the spot size and concomitantly the greater the distance between the exit window and the reference plane, the better the scanning performance." Once the rear-window geometry is reached, this limitation is close to a recitation of an admitted design principle — the most vulnerable drafting in the patent.

4. Why a motivated PHOSITA would combine — the affirmative case in one paragraph

The '470 specification itself establishes the motivation with unusual clarity: (i) an express industry demand for a head under one pound that avoids arm/wrist fatigue; (ii) an express demand for a narrow, snoutless profile that fits a V-shaped gun holster; (iii) the express identification of "dead space" from containing the sweep inside the barrel as the cause of the excessive case width; (iv) the express industrial constraint that the scan angle must remain ~25° to control spot-speed variation; and (v) the express dirt-sensitivity problem of a front exit window near the reference plane. A PHOSITA combining the '297-class rear-scanner head ('297) with the in-head signal processing, on-head keyboard/display and shock mounting already taught by '798 (which the '470 incorporates by reference for exactly those subsystems), and with the common-axis/apertured-mirror collection and view-angle discussion of '026 and the grip-below-casing form factor of '802, would have arrived at a narrow-bodied head with the sweep transmitted outside the housing. That is a textbook KSR (A)/(C)/(D)/(F) combination.

5. Why that case probably still fails on the core claims — and the honest bottom line

1. The prior art taught that the sweep must be contained within the barrel. The FIG. 7A reference head is drawn with the entire 25° sweep accommodated inside barrel 86. That is a teaching away from routing the sweep outside the housing.
2. The two straightforward ways to narrow the barrel were known and known to be unacceptable. The '470's FIG. 7B (scanner moved forward, angle increased to 45°) and FIG. 7C (scanner moved to the middle, angle kept at 25°) are documented as degrading, respectively, spot-speed variation, light-sensor effectiveness, and ease of judging scan distance. This is In re Gurley–style teaching away plus an unexpected-results showing.
3. The one contested validity challenge failed. In Symbol Techs. v. Opticon (S.D.N.Y. 1990), aff'd 935 F.2d 1569 (Fed. Cir. 1991), claims 1–5, 27, 31, 33, 50–54, 56–62 were found infringed by the Opticon MSH-840 and were not invalidated. Caveat: I did not independently verify the Opticon record in this session — I am relying on the earlier section of this analysis — and, importantly, that affirmance applied the stricter pre-KSR TSM standard.
4. The TSM/KSR asymmetry cuts both ways. Claims resting on substitutions of known elements (33, 34, 35, 36) and on admitted design principles (57, and arguably 20–22, 29–30) are considerably more exposed under KSR than they were in 1991, while claims 1, 40, 45, 50, 53, 56, 62 and 63 — which require the rear, upwardly-projecting exit window with exterior overhead transmission (claims 8, 44, 49, 52, 54, 58) — remain well supported.
5. Prior-art status of the '297. As a US patent issuing from a US application filed 29 Feb 1980, the '297 is §102(e) art, not §102(a)/(b) art, against the '470's 25 Jan 1982 filing. This is largely academic here, because (a) the '470 expressly incorporates the '297 and the '798 and admits the FIG. 7A head as prior art in its own text (specification admissions are independently usable as prior art), and (b) §103(c) (enacted Nov. 8, 1984, after the '470 issued) would not have disqualified commonly-owned §102(e) art had it applied. I flag this as a technical point I have not fully resolved rather than a settled conclusion.

6. Claim-by-claim vulnerability summary

Bottom line. On the record I have verified, a §103 challenge to the core window-placement claims would rest entirely on the applicant's own admitted design space plus KSR-style design-incentive reasoning — a modern challenge would have a real argument, but it is not a strong one, and it is materially weaker than the challenge that actually failed in Opticon. By contrast, claims 33–36 (laser-diode substitution, on-head keyboard/display, RF telemetry), claim 39 (apertured sensor mirror), claim 57 (large spot at the window) and claims 20–30 (oscillating scanner, stop, shock mounting, cable/connector) are genuinely exposed, several on the strength of the specification's own admissions. A complete opinion would require the full texts of the ~31 U.S. and 14 foreign references of record, which I have deliberately not characterized from memory.