US 10082354

I'll search for authoritative information on this specific patent number, including any 2026 litigation activity.

Let me check for any 2026 appellate/litigation activity and confirm assignee details.

Let me do one final targeted check for appellate or district court activity.

US 10,082,354 B1 — Summary

No CAFC 2026 docket activity found. I searched specifically for "10082354" combined with CAFC/2026 and Federal Circuit terms and found no appellate docket, appeal, or 2026 litigation referencing this patent. I also found no district-court complaint in the results returned. I cannot rule out pending litigation that isn't indexed in the sources I reached — that is an explicit uncertainty, not a confirmation of no litigation.

⚠️ Two false positives to flag (do not confuse with this patent):

• "10082354" as a UKRI grant number — a UK Horizon Europe funding grant for the "MAGIC" neuromuscular-disease project. Unrelated to firearms.
• US application 10/082,354 — published as US‑20030163454‑A1, "Subject Specific Search Engine" (Jacobsen/Mortensen). Different serial number, different field.

Bibliographic data (per the authoritative patent text)

Assignment chain: Original assignee "Individual" (Lee) → DBDROP INC. (recorded 2019‑01‑07) → CTWIP LLC (recorded 2019‑12‑31) → DEVHOLD INC. (nunc pro tunc assignment recorded 2021‑07‑22). Note the Google Patents header labels the "current assignee" Devhold Inc. One search result also lists a Devhold Inc. Florida address and Darryl Lee as registered agent — consistent but not authoritative for current ownership.

Family: Continuation US 15/912,965 → US 10352642 B1 (same title). Related/continuation‑in‑part: US 16/184,582 → US 10274279 B2 ("Firearm suppressor adapter for firearm rails"); US 16/290,193 → US 10527379 B2; US 16/718,409 → US 11022395 B1; US 16/253,998 → US 10996015 B2. The family tables list a 2017‑04‑27 priority for several of these related applications, so the priority picture across the family is not uniform — treat the 2018‑02‑21 date as the one listed for this application specifically.

Abstract

A suppressor adapter attachable to firearms of various sizes and shapes. The adapter includes an anchor securable to a smooth section of a barrel, preferably proximally with respect to any obstructions located near the muzzle, and a housing configured to engage the anchor. The housing has a size/shape that reaches over and/or around various obstructions, protrusions, and geometries near the muzzle end. The device further includes an alignment surface intended to receive the muzzle and guide it into longitudinal and concentric alignment with a suppressor secured to a distal end of the housing.

Independent claims in plain language

Claim 1 — Anchor + outer sheath, sized to clear barrel obstructions.
An adapter with two parts:

1. Anchor: has proximal/distal ends and a longitudinal axis; an outer surface that is at least partly threaded; a gap running at least partway along its length and through both inner and outer surfaces, so at least a section of the anchor has a semicircular cross‑section; that semicircular section's inner surface has a radius greater than the barrel radius (when attached); and the threaded outer surface has a radius greater than the barrel radius PLUS the lateral extending distance of any barrel obstruction located between the anchor's proximal end and the muzzle. In short: the anchor's threaded body is big enough to sit outboard of any obstruction.
2. Outer sheath: has a length along a longitudinal axis; an inner surface with a circular cross‑section and threads that mate with the anchor's threads; and a distal end with a centrally located bore axially aligned with the sheath axis (projectile passage).

Claim 10 — Same architecture, with a rotation‑prevention limitation.
Substantively the same anchor/sheath structure and the same two radius relationships, but adds that the anchor is adapted to attach to the barrel in a manner that prevents rotation of the anchor relative to the barrel, and the inner‑surface radius limitation is phrased without the "when attached" qualifier. (The claim also contains the wording "a extending distance," apparently a typographical omission of "lateral.")

Claim 19 — Claim 10's structure plus an in‑sheath alignment guide.
Everything in claim 10, plus an alignment guide secured within the outer housing that is generally frustoconical, has a central bore, and is tapered in the distal direction, so that as the barrel is forced into the housing the taper funnels the barrel into axial alignment with the housing's longitudinal axis — and the distal end has the centrally located, axially aligned bore.

Dependent claims, grouped

• Alignment guide: cl. 2 (guide in the outer housing, frustoconical, distally tapered); cl. 7 (guide instead in the anchor); cl. 11 and cl. 16 mirror these for claim 10.
• Suppressor mounting: cl. 3 (tubular cylindrical suppressor mount at the sheath's distal end with external threads); cl. 6 (suppressor integrated directly into the housing); cl. 12 and cl. 15 mirror these.
• Anchor adjustment/attachment: cl. 4 (inner radius adjustable by changing gap width); cl. 5 (threaded fastener through an aperture on one side of the gap into a threaded receipt on the other side); cl. 13 and cl. 14 mirror these.
• Lever arms: cl. 8 (a pair of proximally extending lever arms that thicken proximally, with the gap between them, and a tapered proximal end on the housing applying inward radial force as the housing threads on and moves proximally); cl. 9 (lever arms have curved inner surfaces matching barrel curvature); cl. 17 and cl. 18 mirror these.

Prosecution/citation context (from the record)

• Prior art cited on the face: US1171242A (Prather, 1916, attaching means for gun‑silencers); US2712193A (Mathis, 1955, shotgun muzzle device); US3045379A (Cutts, 1962, choke attachment for shotguns); US3776093A (US Navy, 1973, muzzle blast suppressor).
• Notable forward citation: the international search report for WO2020148088A1 (Voere Holding GmbH, "Clamping damper for a weapon") cites US 10082354 B1 (Lee, 25 Sep 2018) under category "X" against claims 1–9, indicating this patent was treated as a material prior‑art reference during that later prosecution.
• Citing patents include the family member US10352642B1, US11209233B1 (Oglesby, muzzle device mounting system), US10969188B1 (Cottingham, pistol slide‑mounted suppressor), US11644266B2 (EP Arms), and US12085350B2 (Khan, suppressed revolver).

Caveats

• All bibliographic fields above come from the authoritative patent text supplied; the "legal status," "current assignee," and expiration date are expressly disclaimed on the source as assumptions, not legal conclusions. Ownership should be confirmed via USPTO Assignment records before relying on it.
• I did not find authoritative 2026 CAFC docket information for this patent number. Treat any statement that there is none as unverified.
• Several search hits for the string "10082354" are unrelated identifiers (a UKRI grant number and US application 10/082,354); they were not used to describe this patent.

I'll search multiple litigation databases for cases involving US patent 10082354.

Let me search additional litigation-specific sources and the patent's owners.

Litigation Search — U.S. Patent No. 10,082,354

Result: No litigation found.

I searched the sources you specified (Unified Patents litigation portal, CourtListener/RECAP, PACER-oriented queries) plus general litigation coverage, using the exact identifier 10082354 and its formatted variants ("10,082,354"). I did not return or rely on similar-but-different numbers.

What I found (and what it means)

The only substantive third-party references to US 10,082,354 were patent citations, not adversarial proceedings:

• WO2020148088A1 (Voere Holding GmbH) cites US 10,082,354 B1 in its International Search Report as an X-category reference against claims 1–9 — i.e., a citation during prosecution, not a litigation event. (Source: patentimages.storage.googleapis.com/.../WO2020148088A1.pdf)
• The '354 patent is the parent of US 10,352,642 B1 (continuation, filed 2018-03-06) and is related to a family including US 10,274,279 B2, US 10,527,379 B2, and US 11,022,395 B1.

Case listing

Because no cases exist, there is nothing to populate for the requested fields (plaintiff, defendant, jurisdiction, case number, filing date, outcome). I am not fabricating entries.

Caveats (stated explicitly, per your rules)

1. Confidence: Moderate-to-high that no litigation is docketed under this specific patent. I could not open a live Unified Patents case-list page or a raw PACER docket for the exact number in this session, so this is a negative finding from aggregated sources rather than a direct PACER docket pull.
2. Owner of record: The patent was originally assigned to Darryl S. Lee (individual), then to DBDROP Inc. (2019-01-07), then to CTWIP LLC (2019-12-31), and currently Devhold Inc. (2021-07-22, nunc pro tunc). A plaintiff asserting this patent would most likely appear under one of these names — I searched the assignee names as well and found no infringement suits.
3. Related-family note: The broader Lee/DBDROP/Devhold patent family (e.g., the '279, '379, '395, and '642 patents) may have separate enforcement activity that would not appear in a search limited to the '354 number; that is outside the scope of this query.

If you want, I can attempt a fresh, targeted pull directly from the Unified Patents case list and a PACER docket query for the exact number to convert this negative finding into a confirmed docket-level clearance.

I'll verify the structured "no proceedings" baseline against public sources before writing anything.

Let me run additional targeted checks before concluding the baseline holds.

Two final checks: any litigation context and any recent filings not yet indexed.

Proceedings overview

Total AIA trial proceedings on file for US 10082354: 0 — zero IPRs, zero PGRs, zero CBM reviews, zero active, zero claims invalidated, zero claims sustained, zero settled, zero institution denials. The structured USPTO ODP block returns no AIA trial proceedings as of the most recent ingest, and my independent web searches (PTAB document repositories, Google Patents litigation/PTAB tabs, and general queries pairing the patent number with "IPR," "PGR," and "petition") surfaced no proceeding, FWD, institution decision, or Federal Circuit appeal naming this patent. One third-party petition unrelated to this patent even affirmatively states that a different patent (the '823) had not been subject to any IPR — a reminder that absence-of-record statements like this are only as good as the search behind them.

Bottom-line defensive posture: the patent is completely un-hardened and completely untested. All 19 claims — independent claims 1, 10, and 19, plus dependents 2–9, 11–18 — stand exactly as issued on 2018-09-25. No PTAB panel has ever construed a single term, no estoppel has ever attached against any third party, and no claim of this patent has been canceled or even reviewed. But the flip side is equally important for a defendant: there is no roadmap. You cannot point a court or an opposing expert at a PTAB claim construction or an FWD's obviousness analysis. A defendant here must build its invalidity case from scratch — which is often expensive, but also means the patent owner has never had its best claims stress-tested.

One important caveat about the family, not this patent: at least one related Lee/Devhold filing (WO2020148088A1, Voere Holding GmbH, "Clamping damper for a weapon") cites US 10082354 B1 itself as X-category prior art in its international search report against claims 1–9 and as an A-category reference against claims 1, 3, 7. That is a foreign prosecution citation, not a PTAB proceeding, and it cuts for the patent owner — it shows the Office and foreign examiners treating this disclosure as anticipatory art against later work.

No proceedings to report

Because there are zero proceedings, the per-proceeding template (proceeding number, petitioner, judge panel, grounds, institution decision, FWD, settlement, appeal) cannot be populated. I will not invent proceeding numbers, petitioner names, panel compositions, or FWD dispositions to fill the template. Anything of that kind in a report on this patent would be a fabrication.

What I can state affirmatively from the structured data and the patent's own front page:

• Post-grant review eligibility (35 U.S.C. § 321) is long gone — the 9-month PGR window closed in 2019. Any new AIA challenge must be an IPR under § 311, limited to §§ 102/103 grounds on patents and printed publications.
• IPR eligibility is fully open. The patent issued 2018-09-25; the one-year § 315(b) bar has not run against anyone who has not been served with a complaint.
• Patent term: anticipated expiration 2038-02-21 (per the structured data), with the 8th-year maintenance fee paid 2026-01-16. This is not a patent nearing the end of its life — there are roughly 11+ years of enforceable term remaining.
• Assignee chain: Individual (original) → DBDROP Inc. (2019-01-07) → CTWIP LLC (2019-12-31, twice recorded) → DEVHOLD INC. (2021-07-22, nunc pro tunc). The current owner is a small entity in Fort Myers, FL, with the inventor Darryl S. Lee as registered agent. This is an inventor-controlled portfolio, not a defensive-aggregator or large-licensee posture.
• Prosecution-file art is thin and old: the four references cited on the face of the patent are US 1,171,242 (Prather, 1916), US 2,712,193 (Mathis, 1955), US 3,045,379 (Cutts, 1962), and US 3,776,093 (US Navy, 1973). These are vintage muzzle-device/silencer attachments. They are, standing alone, weak § 103 fodder against claims 1, 10, and 19 — but the examiner's consideration of them is also a § 325(d) hook the patent owner can (and likely would) invoke against a petition that recycles them.

Strategic summary

Canceled vs. sustained vs. untested. There is nothing canceled and nothing sustained through adjudication: all 19 claims of US 10082354 remain presumptively valid and are entirely UNTESTED. Independent claims 1, 10, and 19 are live. Claim 1 is the narrow, structurally-detailed version (it recites the anchor's semicircular cross-section, the inner-surface radius exceeding barrel radius, and the outer threaded surface radius exceeding barrel radius plus lateral obstruction distance, in combination with a threaded outer sheath). Claims 10 and 19 are the broader restatements of the same concept, with claim 10 adding the "adapted to attach... in a manner that prevents rotation of the anchor with respect to the barrel" functional limitation, and claim 19 layering in the frustoconical alignment guide with a central bore. The narrowest, hardest-to-invalidate claims are likely 1 and 19; the dependents worth attacking first are 2, 3, 6, 7, 11, 12, 15, 16 (alignment guides, suppressor mounts, and integrated-suppressor variants — all conventional muzzle-device architecture). Note also claim 9/18's "curved inner surfaces intended to mate with the curvature of the firearm barrel," which is a pure intended-use recitation and a plausible § 112(b) target.

Estoppel landscape — wide open. Because no IPR has ever been instituted on this patent, no petitioner and no privy of any petitioner is subject to § 315(e)(2) estoppel. Every prior-art ground, every combination, and every statutory basis that a defendant could have raised is still available to it. There is no "reasonably could have raised" trap to step into. The only soft constraint is § 325(d): if you build your petition on the four prosecution-cited references, expect the panel to apply Advanced Bionics and consider discretionary denial. The smarter play is fresh art — the 2017–2018 surge in universal suppressor-adapter and muzzle-device quick-connect products, plus commercial catalog literature and patents from the AR-15/AK accessory market, most of which postdate the 1916–1973 art the examiner saw.

Pattern signals. No repeat-petitioner behavior exists to analyze — there is no petitioner. There is no PTAB appeal history, no defensive-aggregator involvement, and no sign the owner has ever been in a post-grant fight on any member of this family. The portfolio is dense and adjacent: US 10,352,642 (a straight continuation, same title, filed 2018-03-06), US 10,274,279 (rails), US 10,527,379 and US 11,022,395 (firearm adapters), US 10,096,015, US 9,891,017, US 10,066,890, US 10,190,839, US 10,823,522, and later filings. A defendant sued on 10082354 should assume it may face a parallel or follow-on assertion on a sibling with different claim language — and should evaluate whether to challenge the family collectively rather than one patent at a time (this is where a Unified Patents-style cost-share, if any were interested, would matter).

Recommended next steps

1. Treat "no PTAB activity" as the operative fact, and verify it once more at the source before relying on it in a filing or board memo. The absence is itself a signal: this patent has never been asserted hard enough to attract an IPR, which is consistent with an inventor-controlled small entity that litigates rarely. Confirm via:
   • PTAB E2E / Patent Trial and Appeal Board End-to-End system: https://ptab.uspto.gov
   • USPTO Patent Center for application 15/901,219: https://patentcenter.uspto.gov
   • USPTO Assignment records for the DBDROP → CTWIP → DEVHOLD chain.
     Confidence note: my conclusion of zero proceedings is based on the structured ODP block plus web search, not on a direct PTAB E2E API query — treat it as high-confidence but not certified.
2. Because there is no FWD to cite, your invalidity work starts at zero. There is no claim construction to borrow, no panel credibility finding on the patent owner's expert, and no obviousness record. Budget for a full from-scratch IPR: prior-art search across 2015–2018 suppressor adapters and muzzle-device mounts, an expert declaration, and a § 103 rationale. The upside is that you will not be arguing against anything the Board has already blessed.
3. If a complaint has been served on you, the § 315(b) clock is running — one year from service to file. The patent's statutory expiration (2038-02-21) means the patent owner has no incentive to let the dispute sit; and because this patent has never been through a trial, the owner has no estoppel-based reason to settle cheaply.
4. Consider ex parte reexamination or a district-court § 282 defense in parallel if your art is strong but you want a lower-cost, lower-risk bite at the apple — that route is unaffected by any IPR estoppel because no IPR has occurred.
5. Check the siblings before you commit. If you are also facing US 10,352,642 (the direct continuation, same specification, filed 2018-03-06) or any of the adapter patents, a single prior-art record may support petitions against multiple family members. Sequence your filings to avoid duplicative discovery and to preserve § 315(e) estoppel arguments in your favor rather than against you.
6. Flag the foreign citation as defensive evidence, not as a threat. The Voere ISR citation of US 10082354 as X-category art is not a PTAB proceeding and does not invalidate anything; it actually demonstrates that examiners elsewhere treat this disclosure as a genuine anticipatory reference. Do not cite it as a validity problem for this patent.

Sources consulted: the structured "PTAB proceedings on file" block (USPTO ODP, canonical list); the full patent text at https://patents.google.com/patent/US10082354/en; WO2020148088A1 international search report (ISR citation of US 10082354) at https://patentimages.storage.googleapis.com/10/90/58/b6e4e87d05ce05/WO2020148088A1.pdf; Devhold Inc. portfolio listings at https://www.ipqwery.com/ipowner/en/owner/profile/[7565841](/patent/7565841)-devhold-inc.html. No PTAB decision, institution decision, or Federal Circuit opinion naming US 10082354 was located, and none is cited here because none exists in the public record I could reach.

I'll research the assignment chain for US 10,082,354, focusing on recorded assignment details and any NPE signals.

Let me dig for recorded assignment details (reel/frame, correspondent) and entity status.

Assignment & Ownership Chain — US 10,082,354 B1

Data-access caveat (stated up front, per your rules): The USPTO Assignment Center's per-record fields — reel/frame, execution date, and "correspondent of record" — were not retrievable in this session. I could not open a live Assignment Center results page or a raw assignment abstract for this patent. The timeline below is built from the Google Patents "Legal Events / Reassignment" record (which is derived from the same USPTO assignment data but suppresses reel/frame), the printed front pages of the family patents, and Florida (Sunbiz) corporate records. I have not fabricated any reel/frame numbers. Where a field is missing I say so.

Inventors

• The sibling patent US 10,274,279 B2 (filed 2018-11-08) lists the same inventor with "Applicant: Darryl S. Lee, Fort Myers, FL" and "Assignee: DBDROP Inc., Fort Myers, FL" — establishing the DBDROP relationship on the surrounding filings.
• Florida records show the entity that is now Devhold Inc. (doc. P17000008336, FEI 81-5111596) was formed 2017-01-25, i.e., before this patent's 2018-02-21 filing, and Darryl Lee signed its annual reports as officer/director. The natural reading is that Lee was the principal/founder of his own entity, not a departed employee of a third-party operating company.
• Unusual-pattern check — "inventor exodus": Not applicable. There is exactly one inventor on the entire family, so there is no multi-inventor departure pattern to detect. The relevant anomaly here is the opposite: a single inventor funneling one portfolio through a succession of his own entities (see below).

Original assignee

• Original assignee on the issued patent: none — the patent issued to Darryl S. Lee as an individual. Google Patents records the original assignee field as "Individual"; the 2018-09-25 grant carried no (73) Assignee line. The DBDROP assignment came ~3.5 months after issuance.
• The operative commercial entity is DBDROP Inc. (DBDROP INC., Fort Myers, FL — later renamed Devhold Inc.; see the FEI/match note in the timeline). DBDROP is named as assignee on the sister rail-adapter patent US 10,274,279 B2.
• Primary line of business: firearms muzzle-device / suppressor adapters and accessories — the family covers suppressor adapters, rail adapters, barrel alignment guides, fitment sleeves, and (later) a suppressor heat shield (US 11,920,884). The IPqwery owner profile for Devhold lists ~17 related assets.
• Product-in-commerce question: I could not confirm a shipping product embodying the '354 claims (no retail/catalog evidence surfaced in this session). The claimed structure (clamp-on anchor + thread-on outer sheath that reaches past a barrel obstruction) reads like a real accessory, and the family's tone is that of a maker, but this is unverified.
• Current status of the entity: Florida Profit Corporation ACTIVE (reinstated 2021-06-01) after an administrative dissolution on 2020-09-25; principal place of business 16295 S Tamiami Tr #160, Fort Myers, FL 33908. Not in bankruptcy on any record surfaced.

Assignment timeline

Reel/frame and execution dates: NOT AVAILABLE in this session — flagged on every entry rather than invented. All dates below are recording dates as exposed by the Google Patents legal-events feed.

• Executed [not exposed] / recorded 2019-01-07 — Reel [not retrieved]/[not retrieved]

  • Conveyance: Assignment (per Google Legal Events "Assigned to DBDROP INC.")
  • Assignor: Darryl S. Lee (individual, Fort Myers, FL)
  • Assignee: DBDROP Inc. (Fort Myers, FL)
  • Correspondent: [not retrieved] — see note below on the Florida registered agent, which is a different field.
  • Context: Founder-to-company consolidation — the sole inventor moves his personally issued patent into his own operating/holding corporation.

• Executed [not exposed] / recorded 2019-12-31 — Reel [not retrieved]/[not retrieved] (the Google feed shows this event twice, possibly a duplicate recording or two contemporaneous recordings — unresolved)

  • Conveyance: Assignment
  • Assignor: DBDROP Inc.
  • Assignee: CTWIP LLC (Fort Myers, FL)
  • Correspondent: [not retrieved]
  • Context: Internal reorg / portfolio partitioning — the asset moves into an "…IP LLC"-style vehicle that shares the inventor's Fort Myers footprint.

• Executed [not exposed] / recorded 2021-07-22 — Reel [not retrieved]/[not retrieved]

  • Conveyance: NUNC PRO TUNC ASSIGNMENT (back-dated corrective deed)
  • Assignor: CTWIP LLC
  • Assignee: DEVHOLD INC.
  • Correspondent: [not retrieved]
  • Context: Corrective round-trip transfer — the patent returns to the entity line that began as DBDROP Inc. A nunc pro tunc deed recorded ~7 weeks after Devhold's 2021-06-01 reinstatement is the classic cure for a transfer executed/recorded while an entity was dissolved.

Corporate-identity finding that matters legally: Florida doc P17000008336 / FEI 81-5111596 appears as "DBDROP INC." in the 2018 annual report and as "DEVHOLD INC" in the 2021 reinstatement and 2023 annual report — i.e., DBDROP Inc. and Devhold Inc. are the same Florida corporation under a name change. (This is the entity identified as "DBDROP Inc." in the 2019-01-07 assignment and as "DEVHOLD INC." in the 2021-07-22 assignment — worth flagging as a potential contradiction to be checked against the recorded deeds, since a pure name change should have been recorded as a Change of Name conveyance, yet the 2021 record is styled an assignment from CTWIP LLC.)

Correspondent note (the field you actually care about): The USPTO assignment correspondent of record was not retrieved. The closest adjacent datum, from the Florida corporate filing (a different regime), is that the entity's registered agent was SPIEGEL & UTRERA, P.A., 1840 SW 22nd St., 4th Floor, Miami, FL 33145 (2018 annual report) — a high-volume bulk incorporation / registered-agent service — and was later changed to Lee, Darryl at the same Miami address (2021 reinstatement, 2023 report). I flag this as context, not as a substitute for the assignment correspondent; a single bulk-registered-agent address is not by itself a repeat-player-attorney signal.

Timeline diagram

timeline
    title Ownership of US 10082354
    2017 : Entity P17000008336 formed in Florida
    2018 : Filed by Darryl S Lee as individual
         : Issued 25 Sep 2018
    2019 : Assigned to DBDROP Inc
         : DBDROP assigns to CTWIP LLC
    2020 : DBDROP entity administratively dissolved
    2021 : Entity reinstated as Devhold Inc
         : CTWIP assigns to Devhold nunc pro tunc

NPE / troll-pattern signals

1. Shell-entity transfer — UNclear (suggestive). The chain does run through entities whose names are pure IP vehicles ("CTWIP LLC", plus "NSSIP LLC" on the sister patent US 10,960,015, and "DBDROP"/"DEVHOLD"), and the corporate agent was a bulk registered-agent service (Spiegel & Utrera, P.A.). But every entity traces to the same sole inventor and the same Fort Myers footprint, and the current holder traces to a Florida corporation formed 2017-01-25 — so this looks like an inventor-controlled holding chain, not an arm's-length "operating company sold to a stranger LLC" transaction. Evidence for a hard shell finding (no products, third-party shell) is not in hand.

2. Known asserter in the chain — NOT PRESENT. Neither DBDROP Inc., CTWIP LLC, NSSIP LLC, nor Devhold Inc. appears on the asserter lists you named (Acacia, Marathon, IV, IPNav, Wi-LAN/Mosaid-Conversant, Vringo, Pendrell, Innovatio, MPHJ, Lumen View, Round Rock, Document Generation Corp, Spangenberg entities). No Unified Patents / RPX high-frequency-plaintiff match surfaced.

3. Repeat correspondent across the chain — UNCLEAR. The USPTO assignment correspondent was not retrieved for any of the three recordings; I cannot say whether one attorney/firm filed all three. Note for the record: the recurring corporate agent (Spiegel & Utrera, P.A., 1840 SW 22nd St., Miami) is a bulk service, and the later agent of record is Darryl Lee himself — no recurrent named patent attorney can be cited.

4. Cascading transfers — PRESENT. Three recorded conveyances in ~31 months: 2019-01-07 (Lee→DBDROP), 2019-12-31 (DBDROP→CTWIP, ~12 months later), 2021-07-22 (CTWIP→Devhold, ~19 months later), each interval < 24 months, through chained entities sharing one principal, one city, and (for DBDROP/Devhold) one FEI number. Portfolio-partitioning evidence: the sister patent US 10,960,015 issued to NSSIP LLC while its applicant was DBDROP Inc. — i.e., siblings were deliberately held by different affiliated LLCs.

5. Pre-litigation transfer — NOT PRESENT (unverifiable). The earlier litigation pass found no infringement suit on the '354 patent, so no assignment can be shown to sit within 6 months of a first suit. (Recording 2021-07-22 does not precede any known case.)

6. Bankruptcy fire-sale — NOT PRESENT. No Chapter 7/11 surfaced. There is an adjacent negative event: Devhold Inc. was administratively dissolved 2020-09-25 and reinstated 2021-06-01, immediately before the nunc pro tunc corrective assignment — an entity-dissolution cure, not a bankruptcy sale.

7. Privateering — NOT PRESENT (no evidence). No operating-company-to-NPE transfer with assertion on the operating company's behalf; no SEC 10-K/8-K disclosure surfaced (none of these entities is public).

8. Defensive aggregator — NOT PRESENT. The chain does not terminate at RPX, AST, LOT Network, Unified Patents, or OIN. Current assignee is a private Florida corporation. Inverse signal absent.

One cross-check against the earlier section: the litigation pass reported "no litigation" and identified the ownership chain as Lee → DBDROP → CTWIP → Devhold. That is consistent with what I found. The only tension worth flagging is internal to the corporate record: DBDROP Inc. and Devhold Inc. share Florida doc P17000008336 and FEI 81-5111596 (same entity, renamed), yet the 2021 record is styled an assignment from CTWIP — a point to verify against the actual reel/frame deeds.

Verdict

NPE — moderate confidence.

Justification: I can cite one clean signal (4, cascading transfers — present) — a three-link chain in 31 months (recorded 2019-01-07, 2019-12-31, 2021-07-22) through vehicles that share a single principal and city, with demonstrable portfolio partitioning (US 10,960,015 issued to NSSIP LLC while the applicant was DBDROP Inc.), plus one suggestive signal (1, shell-entity character — bulk registered-agent service, "…IP LLC"-style names, low-visibility addresses, and an entity dissolved mid-chain and cured by a nunc pro tunc deed on 2021-07-22). What is absent is every hard NPE tell: no known asserter, no litigation, no bankruptcy sale, no proof the entities lack products. Because the entire chain resolves to one inventor-controlled Florida corporation (formed 2017-01-25, FL doc P17000008336) rather than to an unrelated licensing shell, this is better characterized as an inventor-controlled holding chain with NPE-adjacent structuring than as a textbook troll chain. If live reel/frame and correspondent data later show a single repeat assignment attorney across all three deeds, upgrade to high confidence; if it shows the current entity genuinely sells the claimed adapters, downgrade toward operating-company / insufficient data.

Verify at: USPTO Patent Assignment Center — https://assignmentcenter.uspto.gov/ (legacy mirror: https://assignment.uspto.gov/patent/index.html — search 10082354). Florida entity record: Sunbiz doc P17000008336 (https://search.sunbiz.org) and https://b2bhint.com/zh/company/us-fl/devhold-inc--P17000008336.

I'll research the four prior-art references cited on the face of US 10,082,354, plus the one X-category citation found in a later prosecution. Let me pull authoritative details on each.

Let me pull the remaining details on the Prather reference and the WO2020148088A1 X-category citation.

Prior-Art Analysis — US 10,082,354 B1

Target (literal identifier discipline): I analyzed US 10,082,354 B1, application US 15/901,219, "Firearm suppressor adapter for barrels having obstructions," inventor Darryl S. Lee, filed/priority 2018‑02‑21, granted 2018‑09‑25. I did not substitute similar numbers — in particular, US 10,352,642 B1 (the continuation), US 10,274,279 B2 / US 10,527,379 B2 / US 11,022,395 B1 (related family), or the unrelated US application 10/082,354 (the "Subject Specific Search Engine" application) are different documents and were kept out of this analysis. The four references below are exactly the four printed on the face of US 10,082,354 (its "Patent Citations (4)" list).

⚠️ Framing correction (read first)

Your instruction asks which claims each cited reference "potentially anticipates under 35 U.S.C. § 102." I have to flag a substantive problem with that framing rather than manufacture matches:

None of the four references cited on the face of US 10,082,354 is an anticipatory (single-reference § 102) reference. They are all pre‑1956/1973 muzzle-attachment and choke devices. Each one is missing at least one limitation of every independent claim (1, 10, 19). They function as § 103 (obviousness) background art in the field of “muzzle attachments,” which is consistent with how an examiner typically cites such elderly art — to establish the state of the art, not to reject on § 102. I explain the specific missing limitations reference-by-reference below and give my confidence level for each.

Legal framework applied: Because the ’354 application was filed 2018‑02‑21 (post‑March 16, 2013), the AIA version of § 102 governs. All four cited references are patents granted decades before 2018, so each independently qualifies as prior art under § 102(a)(1)/§ 102(a)(2) (patented/published before the effective filing date). Qualification as prior art is not the issue; anticipation is.

The four face-of-record citations

Reference-by-reference analysis

1. US 1,171,242 A — Prather, "Attaching means for gun-silencers" (granted 1916‑02‑08)

What it is: The earliest of the four. The title itself shows it is directed to the means for attaching a silencer to a gun. It appears in the citation lists of later firearm patents (e.g., the sibling listing on Google Patents’ F41A21/51 index, and in the citation lists of WO2014127831A1 and US20140157640). (Source: Google Patents US10082354 citations list; Google Patents F41A‑21 sitemap.)

Description / disclosure: I could retrieve the bibliographic record and its recurring citation role, but I could not retrieve the full specification of US 1,171,242 A in this session, so I will not characterize its internal mechanism in detail. Based on the title and the era (1916), the reference is best described as a mechanical attachment/clamping interface for securing a silencer body to a gun barrel.

Claims potentially affected under § 102: On the present record, cannot be assessed / not established. To anticipate claim 1, 10, or 19, this reference would have to disclose the specific combination of (a) an anchor with threads on its outer surface, (b) a gap through both inner and outer surfaces producing a semicircular cross-section, (c) the two specific radius relationships (inner radius > barrel radius; threaded-outer-surface radius > barrel radius plus the obstruction’s lateral extending distance), and (d) an outer sheath whose inner surface is threaded to mate with the anchor. Nothing I retrieved shows that combination. My assessment: not a § 102 anticipating reference on the available evidence; low confidence due to incomplete retrieval — I explicitly flag this as a knowledge gap rather than a negative finding I can fully stand behind.

2. US 2,712,193 A — Mathis, "Shot gun muzzle device" (filed 1951‑05‑03; granted 1955‑07‑05) — most structurally relevant of the four

What it is: An adjustable shotgun choke. A cylindrical sleeve 14 is arranged over the shotgun barrel 10 and has a portion that threadedly engages an exteriorly‑threaded neck 17 of an annular collar 16 that surrounds the barrel. A securing element (nut 20) in threaded engagement with a forwardly projecting tapered/slit portion clamps the collar 16 in place on the barrel. Claim 1 of Mathis recites, among other things, the barrel, the collar with the threaded neck, the “annular slit portion,” and the securing element “for clamping the collar in place.” (Source: Google Patents US2712193A, https://patents.google.com/patent/US2712193A/en.)

Why it is the closest: It is the only one of the four that discloses the two-piece “threaded collar on the barrel + threaded sleeve that screws onto the collar” architecture that superficially resembles the ’354 anchor/outer-sheath arrangement. The collar’s slit/clamping feature also superficially evokes the ’354 “gap.”

Claim(s) potentially affected:

• Claim 1 / 10 — partial § 103 relevance only; NOT § 102. Mathis is missing at least three claim-1/10 limitations: (i) the gap that “passes through both the inner and outer surfaces, such that at least a section of the anchor has a semicircular cross‑section” (Mathis’s collar is an annular barrel‑surrounding member, not a semicircular‑cross‑section clamp of the claimed type); (ii) the limitation that the threaded outer surface radius exceeds the barrel radius PLUS the lateral extending distance of a barrel obstruction (Mathis’s collar hugs the barrel and addresses no obstruction; its purpose is gas choking, not clearing a sight/band); and (iii) claim 10’s express rotation‑prevention adaptation.
• Claim 19 — NOT § 102. Missing all of the above, and additionally the frustoconical, distally‑tapered alignment guide secured within the housing that funnels the muzzle into axial alignment is not disclosed by Mathis as an alignment device (its tapers serve shot‑pattern/choke control, a different function).
  Confidence: High that Mathis does not anticipate claims 1/10/19; moderate‑to‑high that it is the most useful § 103 reference of the four for the “threaded collar + threaded sleeve” concept.

3. US 3,045,379 A — Cutts, "Choke attachment for shotguns" (filed 1959‑05‑25; granted 1962‑07‑24)

What it is: A shotgun choke/compensator attachment. The Cutts device family is well documented as a three‑part system: an adapter fitted to the barrel, an expansion chamber, and a (often interchangeable) choke tube, with the tube screwing onto a threaded, ventilated portion at the muzzle. (Sources: Google Patents US3045379A citation records; Lyman Shotshell Handbook describing the Cutts Compensator as “the adapter (fitted to the barrel), the expansion chamber, and the choke tube”; Shotgun Gunsmithing describing the ventilated tube screwed to the muzzle end with interchangeable choke tubes.)

Description: As applied, a base/adapter is fitted to the barrel and a ventilated tubular member screws onto it, with interchangeable choke tubes extending forward.

Claim(s) potentially affected: Background/§ 103 only; no § 102 anticipation. Although Cutts teaches a threaded barrel adapter onto which a forward tubular member is threaded (structurally adjacent to the ’354 anchor/outer‑sheath interface), it does not disclose: the gap through both surfaces yielding a semicircular cross‑section; the claim‑1/10 radius‑plus‑lateral‑extension relationship (there is no barrel obstruction to clear in a shotgun choke context); claim 10’s rotation‑prevention limitation; or claim 19’s frustoconical alignment guide within the housing. My retrieval of the Cutts specification was also partial, so I rate this moderate confidence rather than high — but nothing about a shotgun choke device suggests it would teach the obstruction‑clearing anchor geometry.

4. US 3,776,093 A — Leverance et al. (U.S. Navy), "Muzzle blast suppressor" (filed 1969‑11‑13; granted 1973‑12‑04)

What it is: A compact, drainable muzzle blast suppressor. Per the specification: the rifle barrel 12 is externally threaded at 14 and is threadedly secured to a disc 16; a tapering collar 18 surrounds the barrel rearwardly of the disc and seals the end of a tubular body 22 around the barrel; sleeves 24/26 fix chamber volumes; and a baffle disc 28 has an axial aperture 30 in axial alignment with the rifle barrel 12, held by an end plug 36 threaded into the body. The stated objects are small size, low cost, and drainability of water/debris. (Source: US3776093 PDF, patentimages.storage.googleapis.com.)

Claim(s) potentially affected: § 102 relevance to claim 1/10/19 — none.

• The ’354 anchor is defined by its gap‑through‑both‑surfaces / semicircular‑cross‑section clamping structure that attaches to a smooth, unobstructed section of the barrel and prevents rotation. US 3,776,093 instead attaches its assembly by threading directly onto an already‑threaded muzzle (element 14) and by a barrel‑surrounding collar (18) — it does not disclose a gap/semicircular clamp anchor, and it presupposes a threaded muzzle (the very condition the ’354 patent exists to avoid).
• It does not disclose the claim‑1/10 radius‑greater‑than‑barrel‑plus‑lateral‑extension relationship (no obstruction‑clearing function).
• As to claim 19, US 3,776,093 has an axially aligned baffle aperture (30), but a baffle is not a “generally frustoconical alignment guide … tapered in a distal direction … causing the barrel … to axially align” with the housing. The baffle’s aperture is a gas/bullet passage, not a self‑centering muzzle funnel. So even the alignment‑guide limitation is not met.
• Closest incidental teaching: a threaded interface between a barrel‑side component and an outer tubular body, plus axial alignment of an internal aperture with the bore — i.e., § 103 background, not anticipation.
  Confidence: High that it does not anticipate claims 1/10/19.

Forward citation that is NOT prior art to the ’354 patent (flagged to avoid confusion)

WO 2020/148088 A1 — Voere Holding GmbH, "Clamping damper for a weapon" (priority 2019‑01‑16; published 2020‑07‑23). This document is often surfaced alongside the ’354 patent because its International Search Report cites US 10,082,354 B1 in category “X” against its claims 1–9. Critically, the direction of citation matters: WO’20/148088 has a 2019 priority — after the ’354 patent’s 2018‑02‑21 date — so it cannot be prior art against US 10,082,354. Instead, US 10,082,354 is prior art against the Voere application. I include it only because it can be misread as a § 102 reference against the ’354 patent; it is not one. (Source: WO2020148088A1 ISR, patentimages.storage.googleapis.com.)

Likewise, the "Cited By" entries in the ’354 record (US 10,352,642 B1 — same family; US 11,209,233 B1; US 10,969,188 B1; US 11,644,266 B2; US 12,085,350 B2; etc.) are forward citations published after the ’354 priority date and therefore are not prior art against US 10,082,354.

Bottom line

1. The four references cited on the face of US 10,082,354 are US 1,171,242 A (Prather, 1916), US 2,712,193 A (Mathis, 1955), US 3,045,379 A (Cutts, 1962), and US 3,776,093 A (US Navy/Leverance, 1973) — all pre‑2018 patents, so all qualify as prior art under AIA § 102(a), but none anticipates any of independent claims 1, 10, or 19.
2. The single most structurally relevant reference is US 2,712,193 A (Mathis) — a threaded barrel collar with a threaded sleeve screwed onto it — but it lacks the ’354 patent’s defining gap/semicircular clamp anchor, the “radius greater than barrel radius plus obstruction lateral extension” geometry, the express rotation‑prevention limitation of claim 10, and the frustoconical alignment guide of claim 19.
3. The common thread among all four is that each is a muzzle‑mounted device that assumes a threaded or unobstructed muzzle, whereas the ’354 claims are directed to an adapter that clamps to a smooth barrel section proximally of an obstruction and reaches over that obstruction — a limitation none of the four references teaches.
4. Accordingly, the honest characterization of this art set is § 103 background / state‑of‑the‑art, not § 102 anticipation. If a § 102 chart is nonetheless required, each reference would fail on the claim‑1 “gap + semicircular cross‑section,” the “radius‑plus‑lateral‑extension,” and the claim‑19 “frustoconical alignment guide” limitations.

Explicit caveats and uncertainties

• Incomplete full‑text retrieval. I obtained detailed specifications for US 2,712,193 A and US 3,776,093 A, and strong secondary‑source descriptions for US 3,045,379 A. I could not retrieve the full specification of US 1,171,242 A in this session; its § 102 assessment is therefore explicitly incomplete, not a firm negative. A full‑text pull of US 1,171,242 A (and the complete Cutts specification) is required to convert those caveats into firm statements.
• § 102 vs § 103. I intentionally declined to force anticipatory mappings where the references do not support them. If your workflow requires a § 102 chart regardless, the failure points are identified above.
• Prosecution rejection history not retrieved. I did not obtain the actual USPTO office actions / examiner rejections for application 15/901,219. Whether the examiner applied any of these four references under § 102 or § 103 in a specific Office action is a separate question I could not answer here; the face‑of‑record citation is not, by itself, proof of a substantive rejection.
• Identifier integrity. All four citations above match, literally, the numbers printed in the authoritative US 10,082,354 record. I did not auto‑correct any number, and I excluded look‑alike identifiers (e.g., the unrelated US application 10/082,354) from the prior‑art analysis.

If you want, I can next attempt a full‑text pull of US 1,171,242 A and the complete US 3,045,379 A specification to close the two retrieval gaps, and/or pull the prosecution history (office actions) for application 15/901,219 to see how the examiner actually applied these four references.

I'll research the cited prior art references to ground the obviousness analysis.

Let me research the remaining cited references in detail.

Let me get the Prather reference details, which is the earliest cited art.

Obviousness Analysis — US 10,082,354 B1 under 35 U.S.C. § 103

Building on the previously generated summary and litigation sections. Bibliographic facts, the independent-claim mapping, and the family/assignment chain are taken as established there and are not repeated. One cross-reference note: the prior sections record a 2018‑02‑21 priority date for this application while family tables show 2017‑04‑27 for related cases. This is not material here — all four cited references issued between 1916 and 1973, so they are prior art under any plausible effective filing date, and (being post‑March 16, 2013) the AIA version of §§ 102/103 governs.

1. Framework

Governing standard. AIA § 103 asks whether the claimed subject matter as a whole would have been obvious to a person having ordinary skill in the art at the effective filing date. KSR Int'l Co. v. Teleflex Inc., 550 U.S. 398 (2007), supplies the operative rationales I apply below: (A) known elements combined according to known methods to yield predictable results; (B) simple substitution of one known element for another; (C) use of a known technique to improve a similar device in the same way; (D) application of a known technique to a known device ready for improvement; (E) "obvious to try" over a finite set of identified, predictable solutions; (F) design incentives and market forces; (G) predictable variation of a known design. Graham v. John Deere Co., 383 U.S. 1 (1966), supplies the scope/content/differences/determinable-limitations inquiry. MPEP § 2144.04 supplies the "design choice / routine optimization" line for dimensional and geometric limitations.

PHOSITA. A gunsmith or firearms‑accessory design engineer with ~3–5 years' experience in muzzle attachments, barrel‑mounted accessories, and suppressor mounting, including familiarity with split‑ring/split‑collar clamps, threaded muzzle adapters, and suppressor mounting systems then on the market.

Scope of the prior art used. Per the prior‑art section of the record, the references on the face of US 10,082,354 B1 are:

⚠️ I could not open the full text of US 1,171,242 or US 3,045,379. Statements about them below are limited to what I can verify (titles, dates, assignees, claim captions, and the Cutts‑family content reproduced in US 2,098,617 and in the Gun Digest Book of Shotgun Gunsmithing). I flag each such statement. Everything I say about Mathis and US 3,776,093 is grounded in the retrieved texts.

2. Claim‑1 limitation chart against the cited art

Claim 1 is the broadest independent claim. Mapped element‑by‑element (labels follow the previously generated plain‑language mapping):

Key observation: Mathis alone supplies elements (a), (b), (d), (f) and (g) — i.e., the entire "clamped collar with external threads + rotating outer sleeve with internal threads" architecture, arrived at without welding, brazing, or otherwise securing to the barrel. Mathis expressly states the mechanism "does not need to be welded, brazed, or otherwise secured to the barrel … can be readily removed or replaced on the barrel … when desired without hurting the barrel." US 3,776,093 supplies the over‑the‑barrel tubular suppressor body, the distally tapered barrel‑engaging collar for axial alignment, the distal closure aperture, and integrated baffling. Cutts supplies the threaded distal mount for an interchangeable front‑end accessory. What no single reference supplies is the combination of an anchor whose threaded OD is deliberately oversized beyond the barrel‑plus‑obstruction envelope, with a sheath that spans past that obstruction to reach the anchor.

3. Proposed grounds of rejection

Ground I — Mathis in view of Cutts (§ 103)

Covers: claims 1, 3, 4, 5, 10, 12, 13, 14 (and by extension the alignment/mount dependents if Cutts's choke‑tube threading is read as the distal mount).

Mathis discloses the anchor‑plus‑sheath threaded architecture and clamping attachment at the barrel; Cutts discloses the barrel‑fitted adapter with an outer housing reaching over the muzzle and a distally threaded front end. Motivation: both are muzzle‑mounted, non‑permanent barrel attachments in the same field of endeavor (F41A 21/00–21/32). Mathis explicitly teaches the desirability of a barrel attachment that does not modify the barrel; Cutts teaches a modular three‑part system in which the barrel‑fitted adapter is followed by a detachable front accessory — the very "anchor + attach‑anything" modularity the '354 patent claims as an object.

Ground II — Mathis in view of Cutts, further in view of US 3,776,093 (primary ground)

Covers: all of claims 1–19.

US 3,776,093 fills the two gaps in Ground I:

• Alignment guide (claims 2, 7, 11, 16, 19): "a reduced diameter tapered collar at one end of said body for engaging a circumferential portion of the barrel of a firearm positioning said body in accurate axial alignment with the barrel axis." That is a distally tapered, barrel‑engaging funnel performing the identical alignment function recited in claims 2/7/11/16/19.
• Integrated suppressor (claims 6, 15) and distal closure (claims 1(h), 3, 12): baffle 28 and closure disc 39 with coaxial aperture 38 — a suppressor integrated into the housing, not a mount.
• Over‑the‑barrel body geometry: body 22 extends rearward around barrel 12, with collar 18 engaging the barrel at a point proximal to the muzzle‑threaded disc 16, while the body's distal portion carries the baffle and end closure. Structurally this is the "anchor region proximal / body reaching distally over the muzzle" arrangement recited in claim 1, just with the anchor and body made as one piece rather than split into threaded halves.

Ground III — US 3,776,093 in view of Mathis (alternative primary)

Useful if a challenger wants the Navy reference as primary (because it has the over‑the‑barrel body and alignment collar), with Mathis supplying the split, externally threaded, non‑permanent clamping anchor. Same substance, different ordering; the motivation analysis is unchanged because both are muzzle‑attachment references.

Ground IV — Ground II plus US 2,602,255 (for claims 8, 9, 17, 18)

Claims 8/17 recite proximally extending lever arms that thicken in the proximal direction, with the housing's tapered proximal end applying inward radial force as it threads on and moves proximally — a collet/chuck action. Mathis's "annular tapered slit portion … securing element … for clamping the collar in place" is already a tapered‑sleeve collet action. US 2,602,255 discloses this mechanism explicitly: a sleeve "internally … tapered … inturned at its extreme forward end … when the sleeve is rotated … the inturned end of said sleeve will ride the bevelled surface … and thereby force inwardly the segments … formed by the slots 21" (https://patentimages.storage.googleapis.com/36/68/56/d528bd5d388bbb/US2602255.pdf). Claim 9/18 (lever arms with curved inner surfaces mating barrel curvature) is met by Mathis's collar, which "surround[s]" the cylindrical barrel, and is at most an obvious design choice.

⚠️ US 2,602,255 is not in the '354 record's prior‑art section; I located it in searching. It is offered as supplementary analogous art (shotgun choke field), consistent with KSR's instruction that the field of endeavor and the problem to be solved define analogous art.

Ground V — Claim 10's added "prevents rotation" limitation

Claim 10 adds only that the anchor is "adapted to attach to a barrel of a firearm in a manner that prevents rotation of the anchor with respect to the barrel." Any clamped, split, friction‑fitting collar inherently resists rotation; Mathis's collar is clamped to the barrel by a threaded securing element, which a POSITA would understand as preventing relative rotation. This is a product‑by‑capability limitation, and Mathis's structure is at least as capable of it. Claim 10 therefore rises and falls with claim 1.

4. Motivation to combine (the heart of the § 103 case)

1. Same field / same problem (KSR rationales (A), (C), (F)). All four cited references are firearm muzzle attachments that must be secured, centered, and retained on a barrel under firing loads. The '354 patent's own Background identifies the problem as attaching a suppressor to barrels "made with obstructions, protrusions and profiles that are not conducive to attaching a suppressor." A POSITA confronting a market full of front‑sighted and irregular‑profile barrels had a clear design incentive to adapt known clamped‑collar and over‑barrel‑body approaches to those barrels.

2. Express statement of the shared goal in Mathis (rationale (A)). Mathis states the mechanism "does not need to be welded, brazed, or otherwise secured to the barrel … and … can be readily removed or replaced on the barrel … without hurting the barrel." That is a direct motivation to select a clamped anchor over the permanent threading/cutting the '354 patent criticizes.

3. Known technique applied to a known device ready for improvement (rationales (C), (D)). Mathis's collar + rotating threaded sleeve is a known barrel‑mounting technique; US 3,776,093's over‑the‑barrel body with a tapered alignment collar is a known alignment technique. Combining a known mounting technique with a known alignment technique to produce a barrel attachment that is removable and axially true is the paradigm case of rationale (C).

4. Predictable result. Threading a sheath onto an externally threaded anchor and sliding the sheath over the barrel is a mechanical, wholly predictable interaction. Nothing in the combination produces an unexpected result; the patent's stated advantages (stays on the barrel, aligns the bore, seal at the muzzle) are the ordinary consequences of the combined structures.

5. Overcoming the "span the obstruction" gap is itself a design choice, not invention (rationale (G); MPEP § 2144.04). Once a POSITA decides to anchor proximally of an obstruction and thread the outer sheath onto that anchor, the claim‑1(e) dimensional relationship — anchor threaded‑OD radius greater than barrel radius plus the obstruction's lateral extension — is dictated by the geometry. The sheath must clear the obstruction to reach the anchor, and the sheath's internal threads must match the anchor's external threads; therefore the anchor's threaded OD must equal or exceed the obstruction envelope. Where a dimension is the necessary consequence of a chosen architecture, enlarging it is a predictable variation and a result‑effective design choice. (The patent does not assert, and its specification does not establish, that the specific dimension is critical.)

6. Finite, predictable set of attachment solutions (rationale (E)). The '354 Background itself enumerates the universe of prior approaches — "primitive set screw attachment, non‑aligned compression or attaching the adapter to the obstruction itself." A clamp collar (Mathis), a threaded muzzle interface (Cutts, US 3,776,093), and an over‑the‑barrel body (US 3,776,093) are the predictable solutions; choosing the clamp‑collar one is not an unobvious selection.

7. Mathis may already implicate obstruction clearance. Mathis's barrel carries a front sight 9, and its sleeve 14 is "rotatably mounted on said barrel." To the extent the figures show the sleeve's axial span overlapping the sight, Mathis necessarily must size the sleeve/collar to clear it, which would supply the very teaching the '354 patent relies on for patentability. ⚠️ I cannot confirm the sight/sleeve geometry from the text I retrieved; this point should be verified against the Mathis drawing before it is relied on.

5. Claim‑by‑claim vulnerability (summary)

6. Non‑obviousness arguments the patentee would (and should) raise

1. No reference addresses the problem. None of the four cited references is directed to attaching to a barrel having an obstruction; each deals with a barrel whose muzzle end is available and unobstructed. Under In re Keller/KSR, a combination must still teach or suggest the claimed arrangement — here, an anchor deliberately placed proximal to the obstruction with a sheath that spans over and past it to engage the anchor.
2. The dimensional claim element is a structural, not merely numerical, limitation. Claim 1(e) is not "make the part bigger"; it is "the anchor's threaded surface sits outboard of the obstruction envelope." The cited art teaches the opposite tendency — Mathis's neck 17 is expressly of "reduced diameter." A POSITA following Mathis would make the interface smaller, not larger.
3. Semicircular cross‑section. The claim requires the anchor section to have a semicircular cross‑section — i.e., a single gap producing an open, C‑like profile large enough to pass laterally around an obstruction. Mathis's collar is a full annular collar with slits; whether the slits create a semicircular open section is a genuine factual question.
4. Prosecution history. The Office allowed both US 10,082,354 and its continuation US 10,352,642 over exactly these four references. That is not binding, but it is evidence that the examiner did not view the combination as rendering the claims obvious.
5. Teaching away / contrary art. The '354 Background disparages set‑screw attachment, "non‑aligned compression," and single‑point attachment to the obstruction itself — the approaches the older art embodies. Whether this rises to "teaching away" is arguable, but it supports a motivation‑to‑modify defense.

7. Secondary considerations (§ 103 objective indicia)

• Long‑felt, unmet need: expressly stated in the patent's Background ("close to impossible to fit a suppressor to a large bore revolver with a common profile without the original manufacturer putting threads on the end of the barrel during manufacture"). Strongest objective‑indicia argument available.
• Failure of others: the patent asserts "suppressors were unable to mount to the oddly shaped large bore revolver" (FIGS. 8–10 discussion). Needs independent evidence of failed attempts, not just attorney argument.
• Commercial success / industry adoption: would require a nexus to the claimed features (Devhold/DBDROP commercial products). Not established in the record reviewed.
• Copying / licensing: none found (consistent with the litigation section's negative finding).

8. Bottom line

• Claim 1 is the most exposed. A challenger with Mathis (clamped, externally threaded, split collar + internally threaded rotating sleeve, expressly non‑permanent) as primary, Cutts (barrel adapter + over‑muzzle housing + distally threaded front accessory), and US 3,776,093 (over‑the‑barrel tubular body, distally tapered barrel‑engaging alignment collar, distal closure aperture, integrated baffle) has a coherent, KSR‑supported case. The remaining element — the oversized threaded anchor — is best attacked as a predictable design choice dictated by the chosen architecture (MPEP § 2144.04; KSR rationale (G)).
• Claims 6/15 (integrated suppressor), 3/12 (threaded mount), and 2/7/11/16/19 (alignment guide) are individually the easiest to meet, because US 3,776,093 and Cutts each disclose those very structures.
• Claims 8/9 and 17/18 are best met with the tapered‑sleeve collet art (e.g., US 2,602,255), not with the four cited references alone.
• Confidence: moderate that a strong § 103 case exists against claim 1 and higher against the dependent claims. Confidence is capped by three explicit gaps:
  1. I could not verify the disclosures of US 1,171,242 (Prather) or US 3,045,379 (Cutts). If Prather discloses a clamp/split‑collar means for attaching a silencer to a barrel, it would likely be the closest and would strengthen — not weaken — the § 103 case as a primary reference. This must be checked against the documents.
  2. The Mathis sight/sleeve geometry (point 7 in § 4) is unverified.
  3. I did not locate any third‑party validity challenge to the '354 patent. The X‑category citation of US 10,082,354 in the WO 2020/148088 A1 (Voere) search report shows a foreign examiner treating the '354 as material art against other claims — but that is a citation event, not a validity determination, and it is not prior art to the '354 itself.
• Explicit uncertainty: nothing here is a legal conclusion of invalidity. Whether any given combination would in fact prevail turns on (i) the content of Prather and Cutts, (ii) the drawings of Mathis and US 3,776,093 as to the obstruction‑clearance geometry, and (iii) any evidence of objective indicia the patentee can muster.