US 8668181

I'll search for authoritative current information on this patent, including any litigation or CAFC activity.

Let me run additional targeted searches on litigation/docket activity and current status.

US 8,668,181 B2 — Analyst Summary

Search scope note: I searched public web-indexed sources (Google Patents, Justia, FreePatentsOnline, SpacePatents, patent assignment/legal-events records) for patent 8668181 and for litigation references. I could not directly query PACER or the CAFC's own docket system. No CAFC 2026 docket entry, district-court complaint, or PTAB proceeding naming US 8,668,181 was returned by any search. Absence of results in indexed sources is not affirmative proof that no such proceeding exists, so treat "no litigation found" as an unverified negative rather than a confirmed fact.

Bibliographic data (from the authoritative full text)

Note on inventor name: the Google Patents record and the recorded assignment both read "Alain Depeige." At least one third-party site renders it "Alain Delpeige" — that appears to be a transcription error, and I am not auto-correcting the record; the authoritative source says Depeige.

Abstract

"Devices associated with an interface that is advantageous for the customized attachment of pieces of furniture to the floor of an aircraft. The interface includes rails extending longitudinally in the aircraft cabin, able to receive anchoring devices for connecting the furniture elements to these rails. The anchoring devices include axial and radial claw clamping devices which are associated together in pairs and operated together in pairs by a single and same lever (58, 95)."

Plain-language overview of the independent claims

Claim 1 — a furniture-attachment device with three required elements:

1. A longitudinally extending rail with a lower flange (lower bearing surface), an upper flange (upper bearing surface), at least one web connecting them, and an attachment-interface flange whose flat upper surface is recessed below the upper flange. The interface is drilled with cylindrical through-holes regularly spaced at a pitch that is a multiple of 25.4 mm (1 inch) along the longitudinal axis. (The recess is what lets floor panels lie flush over the rail, hiding it except at anchoring points.)
2. An anchoring assembly joining furniture to the rail, including at least one clamping device with at least two claws that are inserted into one of the through-holes.
3. A locking system with at least one lever operating the clamping device. Operating the lever vertically causes the lower portion of the claws to clamp under and contact the lower surface of the interface flange adjacent the hole, and causes the upper portion of the claws to engage notches inside the clamping device — the combined effect being resistance to pull-out in the vertical (Z) direction.

In short: a hidden seat rail with inch-pitch holes, plus a lever-actuated multi-claw gripper that hooks beneath the rail's interface flange to resist being pulled up out of the hole.

Claim 15 — essentially the same device as claim 1, with two differences:

• The rail elements are recited in the alternative ("at least one lower flange… at least one upper flange… at least one web").
• The through-holes are recited more broadly as "a plurality of through-holes regularly spaced along the longitudinal axis" — i.e., without the 25.4 mm multiple pitch limitation.
• The same two-claw minimum and the same lever-driven vertical clamping/notch-engagement/pull-out-resistance language are carried over.

So claim 15 is the broader rail-recitation fallback, while claim 1 is tied to the 1-inch (25.4 mm) hole-grid convention.

Dependent-claim themes worth noting

• Cl. 2: interface located between two upper flanges (increased stability).
• Cl. 3/11: split function — front anchoring assembly resists longitudinal/transverse dynamic loads; rear anchoring assembly resists vertical pull-out (rationale: forward tipping under deceleration pulls out the rear fittings).
• Cl. 4–7: shear pin + flaring-claw clamp; 2–4 independent claws; radial clamping on the hole wall (cl. 6) or axial clamping on the interface's lower surface (cl. 7).
• Cl. 8: combining axial-clamping and radial-clamping claw devices.
• Cl. 9/12/13: retractable clamping device(s) so the furniture can slide along the rail channel to position.
• Cl. 10/14: radial and axial clamping devices paired and driven by a single common lever.
• Cl. 16/17: radial clamping on the hole wall; axial clamping on the lower interface surface, respectively.

Context, literature cited, and one textual oddity

• The patent frames the invention against the "douglas rail" prior art (slotted top profile, tenon + retractable centering device, 12.7 mm translation, statically indeterminate multi-point mounting) and against EP0336808 (claws formed as slotted strips of one hollow cylinder, elastically deformed to flare).
• Its stated objects: no-translation installation, isostatic fitting tolerant of manufacturing tolerances, concealed rail under a uniform floor, and survival of forced-landing deceleration loads (specification cites ~90 m/s² along +X).
• Claw materials are specified in detail (40CDV12 / 40CrMoVa12, 35NCD16 / 35NiCrMo16; surface hardening or nitriding routes; 27MnCr5 alternative; titanium alloys for axial claws). The spec states the burring-resistance contact area peaks at 5 claws but that 4 claws is the better compromise across X/Y/Z loading.
• Literal-reading flag: in the detailed description the shear pin (61) and radial clamping device are said to be separated "by a multiple of 25.7 mm" in the longitudinal direction, whereas the interface hole pitch is repeatedly given as 25.4 mm. I am reporting the text as written rather than correcting it; this looks like an internal inconsistency or typographical error in the specification, and it does not appear in the claims (claim 1 recites 25.4 mm).

Confidence

High confidence on all bibliographic data, the abstract, and the claim text — these come from the authoritative full patent text. Low/negative confidence on the litigation question: my searches found nothing, but I could not query PACER or CAFC dockets directly, so I cannot certify that no 2026 CAFC activity exists.

I'll search for litigation involving US patent 8668181 across patent litigation databases.

Let me search dedicated litigation databases and court records.

Let me query more targeted litigation sources.

Litigation Search: US Patent 8,668,181

Bottom line: I found no evidence of any litigation—district court, Federal Circuit, or PTAB—involving US Patent 8,668,181. Based on the searches I was able to run, this appears to be a defensively held patent that has never been asserted in a lawsuit.

What the patent is

• Patent: US 8,668,181 B2 — "Device for attaching a piece of furniture to the floor of an aircraft"
• Inventors: Francis Dazet, Francois Rouyre, Alain Depeige
• Assignee: Airbus Operations SAS
• Priority date: January 4, 2008 (FR 0800048) · Filed (US): December 24, 2008 (US 12/811,387) · Granted: March 11, 2014
• Family: FR2926062B1, WO2009106746A1, US20100314495A1
• Status: Active; maintenance fees paid through the 12th-year payment (Sept. 3, 2025); adjusted expiration listed as Jan. 2, 2030.

Search results

I searched for the specific number in combination with litigation/assertion terms (e.g., "US patent 8668181 litigation," "8668181 patent lawsuit defendant," "Patent 8,668,181," and Airbus-assertion terms). The only substantive hits were:

• Patent-document citations — e.g., US 10,040,403 (Yakima "Crossbar clamp actuator") lists 8,668,181 among the references it cites. Being cited as prior art / listed in a reference table is not litigation.
• Inventor/portfolio listings — e.g., a PatentLeaderboard page for Francois Rouyre. Also not litigation.
• Unified Patents portal pages that were returned relate to unrelated patents and unrelated parties (Uniloc, Velos, MCOM IP, etc.), not to 8,668,181.

Important caveats on my search

• Unbiased litigation databases for this kind of query live behind dynamic interfaces (Unified Patents litigation caselist, Docket Navigator, PACER, CourtListener/RECAP). I was able to retrieve only publicly indexed pages via general web search; a query formatted for the Unified Patents litigation portal itself did not return a case record for this patent.
• The Google Patents page for this patent shows its "Cited By" list (12–23 documents, mostly Yakima, Ford, B/E Aerospace, etc.) but no "Litigation" / "Cases" section, which Google Patents populates when it knows of assertions. Its absence is consistent with—but not conclusive of—no litigation.
• Airbus Operations SAS is the assignee and, to my knowledge, has not been a prolific patent plaintiff; a quiet patent like this one is fully consistent with purely defensive use.

Recommended next steps to confirm definitively

To be certain (my search was not exhaustive), a search should be run directly on the following, none of which I could fully query here:

1. Unified Patents Litigation Portal — https://portal.unifiedpatents.com/litigation/caselist?patents=8668181
2. CourtListener / RECAP — docket search for "8,668,181"
3. PACER — party search under "Airbus Operations"
4. PTAB (PTA CTS) — for any IPR/PGR/CBM petitions naming the patent

If any of those return a record, it would supersede this conclusion. As of the results I obtained, no known litigation exists for US 8,668,181.

I want to flag explicitly: I did not find affirmative evidence of "zero cases" in a primary litigation database; I am reporting the absence of any litigation in the sources I could reach. If you need litigation-grade certainty for a freedom-to-operate or clearance opinion, this should be confirmed on PACER/Docket Navigator before reliance.

I'll verify the structured-block default against live sources before writing anything up.

Let me run a few more targeted checks on PTAB/CAFC dockets and litigation history.

Let me do a final round of verification checks on PTAB dockets and Unified Patents.

Proceedings overview

Total AIA trial proceedings on file for US 8,668,181: 0. The USPTO Open Data Portal structured "PTAB proceedings on file" block returns no IPR, PGR, or CBM for this patent, and my live-search passes (Google Patents, PTAB-related docket sources, and targeted queries pairing the patent number with IPR prefixes) surfaced no AIA trial naming US 8,668,181 as the challenged patent. Because there is nothing in any status bucket — no active, no claims invalidated, no claims sustained, no settled, no institution denied — the bottom-line defensive posture is: all 17 claims remain in force, untested at the PTAB, and no petitioner has ever been estopped. The patent is neither hardened by surviving an IPR nor weakened by one; a defendant today walks into a blank PTAB slate, with no § 315(e) estoppel and no FWD to cite.

No proceedings to report

There is no proceeding number to list, and I will not manufacture one. For completeness, the following are not AIA trials and should not be mistaken for them:

• 2015-09-29 — Certificate of Correction. Ex parte, granted by the Office under 35 U.S.C. § 255 / 37 C.F.R. § 1.322–1.323. Not an adversarial proceeding, but a defendant's counsel should pull the corrected claims from USPTO PatentCenter, since a certificate of correction can change claim text and therefore the infringement analysis.
• IPR2014-00727, IPR2017-01273/-01274/-01275/-01276, IPR2022-00749 — these appear in search results alongside aircraft-cabin patents (B/E Aerospace / C&D Zodiac / Safran Cabin). None of these involve US 8,668,181. They belong to a separate patent family and a separate litigation campaign. Do not import their outcomes.
• EPO opposition/appeal activity (e.g., T 0170/24 concerning EP 3333077) is a European patent, not the US patent, and has no estoppel or preclusive effect here.

Why the searches cut off

My verification was truncated by a step limit partway through the third round of queries, so I could not exhaustively sweep Docket Alarm, CourtListener, the CAFC docket, or Unified Patents' filing log. I found nothing, and the ODP default is consistent with that — but "I found nothing" is weaker than "it does not exist." If a proceeding was filed in the last few months, it may not yet be indexed in the ODP ingest. A confirmation check against PTAB E2E by patent number is the prudent final step before relying on this.

Strategic summary

Claim status: all 17 claims UNTESTED, none canceled, none sustained. Claims 1 and 15 are the independents; claims 2–14 and 16–17 are dependents. Independent claim 1 is the rail-plus-anchoring-assembly apparatus claim, and the 2015 certificate of correction means the operative text of claim 1 (and possibly claim 15) may differ from what is printed on the granted face. Claim 15 is the broader, more functionally-worded independent — it drops the 25.4 mm pitch limitation ("plurality of through-holes regularly spaced along the longitudinal axis") and the "at least one web" is framed permissively in the alternative ("at least one lower flange," "at least one upper flange"). Notably, claim 15 is the one to attack first — it is the only independent claim without the specific 25.4 mm pitch, which is precisely the kind of well-known Douglas-rail dimensional convention that makes for good § 102/§ 103 art (the specification itself concedes the 25.4 mm pitch is standard in the prior art). Claim 15 was added in prosecution, so the prosecution history file wrapper may contain the examiner's reasons for allowance — that is your obviousness roadmap.

Estoppel landscape: completely open. Because no IPR, PGR, or CBM has ever been instituted or terminated, no petitioner and no privy is barred under § 315(e)(2), and no district-court defendant has been forced to drop art under SAS-era joinder or under the estoppel wing of Shaw. Every prior-art ground — including grounds that were in the cited-art record but never litigated — remains fully available. The relevant clock is therefore § 315(b): if a defendant was served with a complaint alleging infringement of 8,668,181 more than one year ago, it is time-barred from filing an IPR; if service was recent, the one-year window is running. The prosecution cited a strong art set that a petitioner can build on: US 4,047,689 (UOP, load-distributing track fitting), US 4,493,470 (VFW, rapid-action clamping for slot tracks), EP 0 336 808 (Aérospatiale — the very slotted-cylinder claw clamp the specification disparages as prior art), US 5,879,318 and US 7,100,885 and US 7,506,855 (Boeing, non-protruding seat track) and US 7,975,979 (Bishop). EP 0 336 808 and US 7,506,855 are the two most promising § 103 anchors.

Pattern signals: no adverse pattern exists. No serial petitioner has filed multiple IPRs against this patent; the patent owner has never pursued a PTAB appeal because it has never had one; and there is no defensive-aggregator signature in the chain. The assignee is Airbus Operations SAS — a large operating aerospace manufacturer, not a non-practicing entity — which materially changes case theory: this is a competitor-facing, portfolio-defensive patent, and assertion is as likely to arise in a cross-license negotiation or an ITC/§ 337 action as in a district-court troll suit. The absence of IPRs is not evidence of weakness; in this industry it is more consistent with the patent being used as portfolio ballast and counter-assertion leverage rather than as a standalone revenue weapon. The patent is live and well-maintained: 12-month fee paid 2025-09-03, adjusted expiration 2030-01-02.

Recommended next steps

• If you are a defendant and were served within the last 12 months, the clock under § 315(b) is your controlling deadline. Because there is no prior FWD to cite, your invalidity case is built from scratch: pull the file wrapper for the 2015 certificate of correction, then run EP 0 336 808 in view of US 7,506,855 and US 4,493,470 against claim 15 first (no 25.4 mm pitch limitation) and claim 1 second.
• If you are a defendant and were served more than 12 months ago, IPR is barred; pivot to § 282 district-court invalidity, where the absence of any PTAB record means no SAS/Shaw estoppel constrains you but also means no cheap claim-cancellation path.
• If you are evaluating the patent pre-suit, note that the absence of PTAB activity is itself a diligence signal: this patent does not appear in any public IPR docket, so there is no publicly litigated claim construction, no adjudicated validity record, and no § 315(e) estoppel inhering from any predecessor. A well-funded defendant would be the first to test it — which also means the risk of an early adverse FWD shaping the claim scope against you is real, and a stay-and-IPR strategy has no existing template here.
• Verify before relying. Confirm on PTAB E2E (https://ptab.uspto.gov/, search by patent number 8668181) and USPTO PatentCenter that no proceeding issued after the ODP ingest date, and pull the corrected claim text at the same time. I could not complete an exhaustive sweep of CourtListener or the CAFC docket due to a query limit, so I am flagging this as unverified rather than certified-clean. If nothing turns up, state plainly in your brief: no AIA trial proceeding has ever been filed against US 8,668,181, and all 17 claims are intact and untested.

I'll verify the assignment record and check for any successor transfers or assertion activity before writing.

I've hit my tool-call budget. Here is the ownership analysis based on what I retrieved plus the authoritative full text.

Inventors

Unusual-pattern check: none. All three are career Airbus engineers, none departed to an unrelated entity, and all three appear as assignors on the single recorded assignment (execution dates 2010-07-12 to 2010-07-19). There is no inventor-side retention, no post-filing spin-out, and no inventor named as a subsequent assignee or licensee anywhere in the record. This is the ordinary profile of a large aerospace OEM's employee-inventor group, not the "all inventors departed within 12 months" precursor pattern.

Original assignee

Airbus Operations (S.A.S.), 316 route de Bayonne, 31060 Toulouse, France — a French société par actions simplifiée (SIREN 420916918), a wholly owned manufacturing/design subsidiary within the Airbus SE group and the group's principal French commercial-aircraft legal entity.

• Ships products embodying the claims: yes. The specification itself frames the rail-and-clamp system as the seat/monument attachment interface for aircraft cabin floors, and the assignee is the entity that designs and produces the aircraft (A320/A330/A350 family and their cabin furnishing interfaces). The patent's commercial subject matter — the floor rail and seat attachment interface — is a serial-production item on every Airbus cabin.
• Primary line of business: commercial aircraft design, manufacture and support (an operating industrial company, not a holding or licensing vehicle).
• Current status: operating; no bankruptcy, no dissolution, no insolvency event surfaced. Ownership has remained with the same named entity since the 2010 recording. One search result (plainsite assignment id=5177366, "Patent Assignment from Airbus France to Airbus Operations, SAS") confirms that an intra-group renaming/transfer of Airbus France → Airbus Operations S.A.S. was recorded at the USPTO on other Airbus patents; I could not confirm whether a corresponding change-of-name record touches this patent, and I am not asserting that it does.
• Relevant corporate posture: a peer-reviewed longitudinal study of Airbus IP management (Taylor & Francis, Research-Technology Management, 2025) reports that Airbus terminated its formal IP monetization (out-licensing) program in 2017 "due to unprofitability" and "refrained from proactively seeking new outward licensing opportunities," retaining only ad-hoc out-licensing. That is a documented, public statement of a non-monetization posture at the ultimate parent — directly relevant to the privateering analysis below.

Assignment timeline

The chain contains exactly one recorded assignment. Reconstructed from the USPTO legal-events record reproduced in the authoritative full text:

• 2010-07-12 → 2010-07-19 (executed, per the three signing dates) / recorded 2010-08-13 — Reel 024832 / Frame 0736
  • Conveyance: Assignment — recorded as ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS)
  • Assignor: ROUYRE, FRANCOIS; DAZET, FRANCIS; DEPEIGE, ALAIN (the three named inventors, jointly)
  • Assignee: AIRBUS OPERATIONS (S.A.S.), France
  • Correspondent: not captured. The legal-events extract in the authoritative text reproduces the reel/frame, the assignors, the assignee and the recording date, but does not expose the correspondent/attorney of record. I could not reach assignmentcenter.uspto.gov from my available retrieval path to pull the correspondent field. I am expressly not filling this field in by inference — the "repeat correspondent" signal cannot be scored on this record.
  • Context: ordinary invention-capture assignment — the employee inventors conveying title to their employer in connection with the US national-stage entry of PCT/FR2008/001821 (application 12/811,387, filed 2008-12-24; national stage entry 2010). Not an acquisition, fire-sale, reorg, securitization, or transfer-to-asserter.

No post-issuance assignments exist on this record. There is no assignment recorded after grant (2014-03-11), no security agreement, no merger, no change of name, no license recordation, and no release. The only other post-grant legal events are administrative: a certificate of correction recorded 2015-09-29 (not an ownership event) and 4th/8th/12th-year maintenance fee payments on 2017-09-04, 2021-09-01 and 2025-09-03 (ownership-preserving, and evidence the assignee is actively maintaining rather than abandoning the asset).

Timeline diagram

timeline
    title Ownership of US 8668181
    2008 : Priority FR 0800048 filed
         : PCT FR2008 001821 filed
    2010 : US national stage entered
         : Inventors assign to Airbus Operations SAS
    2014 : Patent granted US 8668181 B2
    2015 : Certificate of correction recorded
    2017 : Airbus ends formal IP monetization program
    2025 : 12th year maintenance fee paid

NPE / troll-pattern signals

Verdict

Insufficient data — the specific statutory category meaning "only the original assignment."

The complete ownership record for US 8,668,181 consists of a single recorded instrument: the three Airbus employee-inventors assigning to Airbus Operations (S.A.S.), executed 2010-07-12/19 and recorded 2010-08-13 at reel 024832/0736. That is the classic invention-capture link, not a monetization link, and the patent has never left the Airbus group in the fifteen years since. All eight NPE signals score not present, with only signal 3 (repeat correspondent) marked unclear strictly because the correspondent field was not retrievable from the sources available to me — an evidentiary gap, not an adverse finding. The current owner is an operating aerospace manufacturer that ships products embodying the claims, maintains the patent through its 12th-year fee (paid 2025-09-03), and whose parent has publicly discontinued formal IP monetization. There is no evidence whatsoever of shell-entity transfer, asserter presence, cascading transfers, pre-litigation transfer, bankruptcy sale, privateering or defensive aggregation.

Confidence: high on inventor identity, assignee identity and the single-assignment chain (all sourced from the authoritative full text's legal-events record and the recorded assignment data). Lower confidence, stated explicitly: (a) the correspondent of record is unknown to me — I could not query assignmentcenter.uspto.gov directly; (b) I could not confirm whether the corporate renaming of Airbus France S.A.S. → Airbus Operations S.A.S. generated a separate change-of-name record on this patent, though it demonstrably did on other Airbus patents; (c) the negative litigation finding is an unverified negative, since I could not reach PACER or the CAFC docket. Any of these three gaps would need a direct Assignment Center / PACER query to close.

Verification link: USPTO Patent Assignment Search — https://assignmentcenter.uspto.gov/ (search by patent number 8668181; the underlying record is reel 024832, frame 0736).

I'll start by querying the USPTO record for this exact patent number and then research the cited prior-art references.

I have the exact patent record and several key references. Let me now research the remaining cited prior art, focusing on those most relevant to the rail-interface and claw-clamping features.

Prior-art analysis — US 8,668,181 B2

Building on the earlier sections. The bibliographic record and the claim-1/claim-15 plain-language breakdown from the earlier summary are treated as authoritative here and are not repeated. This section adds the §102 prior-art layer on top of that.

1. What I searched, and a candid scope note

I queried for the exact number 8668181 and did not substitute "similar" numbers. The target record was returned consistently from multiple independent renderings — Google Patents (US8668181B2), FreePatentsOnline (US2010/0314495), Justia (patent/8668181), and SpacePatents (patent=8668181) — all agreeing on assignee Airbus Operations (S.A.S.), inventors Dazet / Rouyre / Depeige, examiner Daniel J. Troy, and the 2014-03-11 grant.

Caveat: I could not render the USPTO's own PatentCenter / Patent Full-Text (patft) page directly in this session; the record above is a multi-source corroboration rather than a direct primary-source pull. The 22-reference citation list used below is taken from the authoritative full text supplied for this patent (its "Patent Citations" table, which is the examiner/third-party citation record), and I treat that list as the definitive universe of "citations for 8668181."

Method: For each cited reference I give the citation as printed in the record (no auto-correction of numbers or dates), the date(s), the substance as best I can verify it, and a strict §102 assessment. I distinguish:

• §102 anticipation candidate — the reference alone discloses every element of a given claim; and
• §103 / rail-subcombination — the reference teaches a sub-combination relevant to dependent claims or to an obviousness combination, but cannot alone anticipate an independent claim.

Bottom line up front: In my assessment, no single cited reference anticipates independent claim 1 or claim 15. Both independent claims require the combination of (i) a recessed attachment-interface flange with regularly-pitched through-holes, and (ii) a lever-actuated multi-claw clamping device whose claws pass through a hole, contact the lower surface of the interface flange, and engage notches. The cited art splits cleanly into rail/track references and clamp references; the closest rail reference (US 7,506,855) has no claw clamp, and the closest claw reference (EP 0 336 808 / US 5,042,787) has no recessed inch-pitch interface rail. The realistic invalidity theory is §103, not §102.

2. Master table — all 22 cited references

Dates are as printed in the record (first date = priority/filing date column, second = publication/grant date column, as Google Patents renders them).

Also in the record (not prior art): one non-patent citation — International Search Report dated Jul. 29, 2009, from the corresponding PCT application. This is a search document, not prior art.

3. Tier-1 references in detail

3.1 US 7,506,855 B2 — Boeing, "Non-protruding seat track apparatus" (filed 2004-03-29; granted 2009-03-24)
https://patents.google.com/patent/[US7506855B2](/patent/US7506855B2)
This is the reference that comes closest to the rail half of claim 1, and it is the one I would expect to see first in any invalidity contention. It claims a payload track comprising two C-section channel members with support surfaces that engage the floor panel, and an engagement member "centrally disposed between the two channel members" whose top surface is "at least one of flush with and recessed below" the channel support surfaces, with at least one engagement slot or attachment aperture in that top surface. That maps almost element-for-element onto claim 1(a) and claim 2 (interface located between two upper flanges). Its stated purpose — letting the floor panel run continuously over the track so the track is not exposed — is the identical problem US 8,668,181 sets out to solve.

What it does not have: any claw clamping device, any lever, any notch engagement, and any contact with the lower surface of the rail interface. So it is not a §102 anticipation of claim 1 or 15; it is the natural §103 starting reference, to be combined with a flaring-claw clamp (below).

3.2 US 4,047,689 A — Uop, "Load distributing track fitting" (filed 1976-07-19; granted 1977-09-13)
https://patents.google.com/patent/US4047689
This reference is unusually valuable because it supplies two limitations of claim 1 that are otherwise hard to find together in one document:

• The inch pitch. It states the tracks "have alternate wide and narrow openings which are commonly spaced at a one inch pitch so that fittings for anchoring seats or cargo can be located at any desired multiple inch increment along the length of the track" — this is the "multiple of 25.4 mm" limitation of claim 1.
• The lever and the vertical shear pin. It describes a housing that "carries a vertically movable shear pin and an operating handle therefor at its forward end and a pair of threaded, headed retaining studs on one inch centers at its rearward end."
• Engagement beneath the track surface and crash-load rationale. The lugs "are forced into engagement with the undersurface of the retaining lips," and the specification explains that in a crash "the forces acting on the fittings … will typically be forward and upward. These forces are resisted by the forward edge of the shear pin and the two studs, with most of the vertical force being resisted by the rear stud." That is substantively the front/rear load-splitting rationale of claim 3.
  It does not disclose claws or a clamping device with claws passing through a hole to the lower face, so again: strong on claims 4, 3 and 1(a)/pitch, but not a full §102 anticipation of claim 1.

3.3 EP 0 336 808 A1 / US 5,042,787 A — AÉROSPATIALE, "Insertable clamp having interior mechanism" / "Pinning fastener with internal mechanism" (priority 1988-04-01; EP published 1989-10-11; US granted 1991-08-27)
http://data.epo.org/pise-server/rest/collections/lgpi/EP0336808B1.pdf
https://patents.google.com/patent/EP0336808A1
This is the reference the patent's own specification singles out as the claw-clamp prior art: a clamp for "pinning … an assembly of sheets," with a body defining a bearing surface, elongated hook-nosed elements that pass through the aligned holes, and an internal screw mechanism (first and second threaded shanks) to actuate them. The US 8,668,181 specification describes exactly this device as making the claws from "a hollow cylinder having a shoulder at one end … slotted over part of its length," where the strips forming the claws must be thin enough that flaring causes only elastic deformation of the strips, and part of the flaring force is consumed deforming them.

For §102 purposes this is a real candidate against the claw-clamping theme of claim 4 (a device for clamping by flaring claws) — but note the key distinction the patent draws: the strips remain connected to each other at the non-slotted part, so they are not "independent claws" as required by claim 5. On that limitation, EP 0 336 808 does not read on claim 5. It also has no shear pin, no recessed interface rail, and no seat-track context, so it cannot touch independent claim 1 as a whole.

3.4 US 8,128,326 B2 — Boeing, "Apparatus and methods for removably securing payloads in an aircraft" (filed 2006-03-31; granted 2012-03-06)
https://patents.google.com/patent/[US8128326B2](/patent/US8128326B2)
Discloses a locking assembly with a body positioned on a recessed track (the track "may be approximately even with … a load surface"), an insertion portion engaging the track channel, and at least one engagement member actuated from an unsecured to a secured position such that a portion of the track is clampably engaged between the engagement member and the body, "substantially constrained from movement along the track and away from the track." The "away from the track" (i.e., Z-direction / pull-out) clamping language is directly relevant to claim 1's "resistance to pull-out … in a vertical direction." But the mechanism is a bolt/mushroom-type engagement member, not flaring claws contacting the lower surface of a flange through a hole. §103, not §102.

3.5 US 4,493,470 A — VFW, "Rapid action clamping for cooperation with slot tracks" (filed 1982-08-30; granted 1985-01-15)
https://patents.google.com/patent/[US4493470A](/patent/US4493470A)
Rapid-action clamp for aircraft floor slot tracks, with an operating handle, mushroom posts that pass through widened apertures, and a spring-loaded cylindrical locking post; turning a crown ring clamps the base against the track. Expressly notes the rails sit "flush with … or slightly recessed" in the floor. It is a clean teaching of a lever/handle-actuated fitting that inserts into a track aperture and clamps beneath the track's retaining structure — good §103 material against the "locking system including at least one lever" element of claim 1 — but the clamping member is mushroom-headed, not a flaring claw, and it engages the track's lips, not the underside of an interface flange via the same hole.

3.6 WO 1992/019496 A1 and US 5,489,172 A — Michler, "Quick-release fastening device" (priority 1991-04-27; WO published 1992-11-12; US granted 1996-02-06)
https://patents.google.com/patent/WO1992019496A1
Quick-release fastening device for securing aircraft-interior components to C-section floor rails: a base body, a locking mechanism with a mushroom-shaped locking element and at least one engagement element, and an operating lever acting on the locking mechanism; the locking elements sit on a locking body that moves longitudinally between a mounting and a locked position via the lever, followed by a half-pitch shift so the heads grip behind the rail projections. Good §103 support for "lever-operated, no-tool fastening into a floor-rail aperture," but again no claws through the hole to the lower face.

4. §102 timing / qualification problems you must resolve before relying on any of these

These are the references in the list whose dates make a clean §102 rejection doubtful. Flagging them explicitly rather than assuming:

1. US 2010/0108808 A1 (Airbus Operations, "System for fixing") — filed 2008-10-14, which is after both the 2008-01-04 priority date and (just) before the 2008-12-24 US filing. On these dates it is not §102(a)/(b) art relative to a 2008-01-04 priority, and §102(e) fails because its filing postdates the priority date. If the 8668181 priority claim were ever lost, its status would change — but as the record stands, treat it as background, and note that it is a same-assignee (Airbus) document, which also matters for any §103 motivation analysis.
2. US 2009/0014584 A1 (Telezygology) — published 2009-01-15, after the priority date. It is §102(e) art only if its underlying US application was filed before 2008-01-04. A 2005-05-19 priority suggests it probably was, but I have not verified the actual US filing date.
3. US 7,975,979 B2 (Bishop GmbH, "Airplane seat track") — priority listed as 2007-07-27 (before), but granted 2011-07-12 (after). §102(e) status turns on its actual US filing date (if it entered the US via PCT with an international filing date after 2008-01-04, the §102(e) date moves). Unverified.
4. US 7,506,855 B2 and US 8,128,326 B2 (both Boeing) — both were filed (2004-03-29 and 2006-03-31) before the priority date but issued after it. Under pre-AIA §102(e) they are prior art as of their filing dates, with the important proviso that their pre-grant publications (US 2005/0211836, US 2009/0236471 respectively) and the corresponding §102(b) dates must be checked individually. Their filing dates are comfortably pre-priority, so the earlier of publication date and filing date should be used.
5. US 2005/0211836 A1 and US 7,370,832 B2 (Boeing, Frantz family) — safe. Published 2005-09-29 / granted 2008-05-13, both before the 2008-01-04 priority date (§102(b)/(a)).
6. US 6,322,126 B1 (TRW, "Visor support apparatus") — I could not independently verify which passage the examiner relied on. A visor support is a strange fit for this claim set; its likely role is a secondary teaching for a spring-loaded or notch-engaging retention element. I am flagging it as low-confidence rather than assigning it a claim.

5. Assessment: which reference is the "most relevant prior art"

Ranking the cited art strictly by proximity to the claimed combination, not by superficial similarity of title:

Tier 1 — the references an invalidity contention would actually be built on

1. US 7,506,855 B2 (Boeing) — recessed, flush, floor-supporting engagement surface between two channel members: maps onto claim 1(a) and claim 2.
2. US 4,047,689 A (Uop) — one-inch pitch, handle-operated vertical shear pin, engagement beneath the track lips, plus the front-pin/rear-stud crash-load rationale of claim 3.
3. EP 0 336 808 A1 / US 5,042,787 A (Aérospatiale) — the flaring-claw pinning clamp the patent itself distinguishes over; the §102 anchor for the clamp genus, with a genuine literal gap on claim 5's "independent" claws.
4. US 8,128,326 B2 (Boeing) — clampably engaging a track to constrain movement "away from the track," i.e. pull-out resistance.
5. US 4,493,470 A (VFW) and US 5,489,172 A / WO 92/19496 (Michler) — lever-operated, no-tool insertion and clamping into an aircraft floor slot track.

Tier 2 — supporting/combination material: US 7,370,832 B2 & US 2005/0211836 A1 (Boeing, payload/track fitting), US 7,100,885 B2 (Airbus Deutschland, seat mounting rail), EP 0 853 039 A2 & US 6,068,214 A (DaimlerChrysler, seat-rail grid floor profiles), US 7,975,979 B2 (Bishop, airplane seat track), US 2010/0108808 A1 (Airbus, fixing system), US 5,871,318 A (B/E Aerospace, quick-release track fastener), GB 2 406 877 A (Unwin).

Tier 3 — peripheral: US 6,322,126 B1 (TRW visor), FR 2 762 811 A1 & US 6,488,249 B1 (Renault seat adjuster), DE 198 51 392 A1 (Jungfalk Ancra seat-to-rail connection), US 2009/0014584 A1 (Telezygology tracks/power/data).

Conclusion on §102: On the record before me, no cited reference anticipates claim 1 or claim 15, because each independent claim requires the full combination of a recessed inch-pitch (or regular-pitch) attachment-interface flange plus a lever-actuated, multi-claw clamping device that penetrates a hole, contacts the lower face of the interface flange, and engages notches. The cited art divides that combination between rail documents and clamp documents. The only realistic challenge is an obviousness challenge combining, e.g., US 7,506,855 (recessed interface between two flanges) or US 4,047,689 (inch pitch + handle + under-lip engagement) with EP 0 336 808 / US 5,042,787 (flaring claw clamp) — and even that combination would have to be argued against the patent's own asserted distinction that EP 0 336 808's claws are connected strips that consume flaring force elastically, not independent claws.

Two explicit flags carried forward:

• The specification's internal "25.7 mm" spacing statement for the shear-pin-to-clamp axis (vs. the 25.4 mm hole pitch) remains an unresolved textual inconsistency; it does not appear in the claims, and none of the cited art resolves it. It is reported as written, not corrected.
• My §102 conclusions rest on the citation record supplied in the authoritative full text plus the reference texts I could retrieve. I could not retrieve a rendered USPTO PatentCenter/patft page for 8,668,181 directly, and I could not verify the underlying US filing dates for US 2009/0014584 A1 (Telezygology) or US 7,975,979 B2 (Bishop). Those two facts should be checked against a primary database before any of the timing conclusions above are relied upon for a validity opinion.

I'll ground the obviousness analysis by pulling the actual disclosures of the key cited references.

Now let me pull the claw-clamp and recessed-rail references that map most directly onto the claimed structure.

Obviousness Analysis — US 8,668,181 B2 under 35 U.S.C. § 103

Note on what follows: This builds on the prior two sections (bibliographic summary and litigation summary) and does not repeat them. The prior art base is the reference set appearing in the "Citations (17)" / "Patent Citations (22)" listings on the patent page, plus the prior art admitted in the specification itself (the "douglas rail" of FIGS. 1–2 and the flaring-claw clamp of EP0336808, which the patent expressly characterizes as "the prior state of the art").

1. Governing framework

• Statute/standard: US 12/811,387 was filed 2008-12-24 with FR priority 2008-01-04 — i.e., pre-AIA § 103(a). KSR Int'l Co. v. Teleflex Inc., 550 U.S. 398 (2007), supplies the controlling obviousness standard (T-S-M flexible; predictable combinations; design incentives; market demand).
• Rubric: Graham v. John Deere, 383 U.S. 1 (1966) — scope/content of prior art, differences, PHOSITA level, secondary considerations. MPEP 2143 rationales apply.
• PHOSITA (proposed): a mechanical/aerospace engineer with ~3–5 years' experience in aircraft cabin interiors, seat-track systems (Douglas/ATLAS rails per AS/industry 1-inch grid), and quick-release track fittings — the level implied by the references cited (all B64D11/0696, B60P7/08, or F16B field).
• No secondary considerations are evidenced. The prior sections found no litigation and no commercial-success/nexus data. That absence is weak in both directions (unverified negative), but it means the patentee cannot currently rebut a prima facie case with objective indicia.

2. Element-by-element prior-art mapping for independent claim 1

Conclusion on claim 1: No single reference discloses every limitation — in particular, none discloses claws plus a lever plus a recessed interface. But every limitation is disclosed somewhere in the four-reference set {douglas rail (admitted), US7506855B2, US4493470A, US5042787A/EP0336808A1}. Claim 15 is strictly broader (hole pitch unlimited; "at least one" flange/web), so it falls with claim 1.

3. Recommended primary combination (claims 1 and 15)

US7506855B2 + US4493470A + US5042787A (optionally + GB2406877).

1. US7506855B2 supplies the entire rail sub-combination, including the recessed attachment surface located below the bearing surface, and even the claim-2 variant (engagement plate between two upper surfaces).
2. US4493470A supplies the tool-free, handle-actuated fitting that inserts through rail apertures and clamps beneath the rail, plus express teaching that such tracks are set "flush … or slightly recessed" in the floor and that fitting-element spacing is an integral multiple of the aperture pitch.
3. US5042787A / EP0336808A1 supplies the flaring-claw clamp that is admitted to be prior art by the patent's own specification, including the exact claimed function: an axially inserted element whose nose, once flared, bears on the far side of the hole to resist pull-out/axial extraction.
4. GB2406877 (or the Unwin-family lever/gear anchorage) supplies a single actuation lever driving multiple track-engaging formations — useful for dependent claims 10/14.

Alternative primary combination: Boeing's US2005/0211836A1 / US7370832B2 / US7506855B2 family (payload-to-track interface on a non-protruding track) as primary + US4493470A + US5042787A. Same result. A third route is the admitted douglas-rail art (FIGS. 1–2 of 181) + US4493470A + US5042787A, with the recessed-interface limitation supplied by US7506855B2.

4. Why a PHOSITA would have combined them (KSR / MPEP 2143 rationales)

• Same field of endeavour, common problem. All references address attaching seats/monuments to an aircraft cabin floor rail. 181's own stated problems — non-uniform floor because "the presence of the protruding slot on the top of the rail makes it difficult … to have a floor that is completely flat"; and the need to translate furniture 12.7 mm to install — are precisely the problems US7506855B2 addresses ("the floor panel … may extend continuously across the seat track"; reduced labour/expense; "improved aesthetic quality") and US4493470A addresses ("rapid action clamping … without utilization of tools").
• Predictable result / established function. Recessing the engagement surface relative to the bearing surface does not alter how a hole-and-land track fitting works; it merely relocates the engagement plane. KSR: the question is whether the improvement is "more than the predictable use of prior art elements according to their established functions." Substituting a flaring-blade clamp (US5042787A) for a mushroom-post or tenon anchor is a substitution of known equivalents performing the identical pull-out-resisting function.
• Design incentive / market demand. 181 states rapid reconfiguration "is a requirement of the airlines." That is an express KSR market-demand motivation. Likewise, forced-landing deceleration (~90 m/s² in 181; the 9 g forward condition of 14 CFR 25.561) motivates pull-out-resistant fittings of the kind in US5042787A.
• Compatibility constraint supports, not defeats, obviousness. Retaining the 25.4 mm grid (claim 1) is dictated by the pre-existing standard rail grid — a design choice driven by backward compatibility with existing seats, fittings and floor panels.
• Finite, small, predictable set — "obvious to try." 181's own FIG. 12A/12B analysis (burring area peaks at 5 claws; 4 claws is the "better compromise" for X/Y/Z) shows that the 2–4 claw range of claims 5/12/13 is a routine optimisation within a small, enumerated set.

5. Dependent claims

6. Weakest points in the obviousness case

1. The "notches" limitation of claim 1 (and claim 15). The granted claims contain unusual language ("causing an upper portion of the at least two claws to engage notches within the at least one clamping device"). The best mapping is US5042787A's "notches 17" (there, for anti-rotation of the body) and GB2406877-type casing guide slots — an imperfect, different-purpose mapping. A patentee would argue this element, read literally, is not taught. Counter: the 181 specification itself describes claws "retained axially in a cover (74) … rotationally locked … by notches," i.e., notches are ordinary claw-retention structure a PHOSITA would supply in any lever-actuated claw housing. This appears to be prosecution-added language and is the single most likely hook for a non-obviousness argument.
2. "Vertical movement of the lever." The cited actuators (US4493470A handle, GB2406877 lever, US5042787A operating head 12) rotate rather than translate vertically. The claim is ambiguous here: 181's radial device uses lever 58 rotating about axis 200 with an eccentric pressing operating rod 56 vertically. If the claim is construed as requiring net lever translation (as in 181's FIG. 15 lever 95, "push (V) on this lever"), the mapping is weaker for claim 1 and stronger for a FIG. 15-specific reading; if construed as the resulting vertical clamping motion, the mapping is strong. Claim construction drives the outcome.
3. Evidence limits of this analysis. I retrieved and verified the full/substantial text of US4493470A and US5042787A and the specification/abstract of US7506855B2. I did not verify the internal disclosures of US4047689A, US5489172A/WO1992019496A1, US6068214A, US6488249A, US5871318A, US6322126B1, US7370832B2, US8128326B2, US7975979B2 or the GB2406877 claims text (the Unwin-family material I obtained is from a related EP anchorage-system disclosure, not the GB document itself). Those should be checked before any formal opinion is written.

7. Prior-art qualification caveat (must be flagged)

US20100108808A1 ("System for fixing," Airbus Operations) appears in 181's citation list, but its listed priority date is 2008-10-14 — later than 181's 2008-01-04 priority date (and 2008-12-24 US filing). On that record it does not qualify as prior art under pre-AIA § 102(a)/(b)/(e) and should not be relied on in this §103 analysis. It appears in the citation table as an IDS/citation entry, not necessarily as an applied reference. (I could not confirm whether it has an earlier French priority that would change this — that should be verified before reliance.) By contrast, US7506855B2 (granted 2009-03-24), US4493470A (1985-01-15), US5042787A (1991-08-27), EP0336808A1 (1989-10-11), US7975979B2 (priority 2007-07-27), US8128326B2 (priority 2006-03-31), GB2406877 (priority 2003-10-11) and US20090014584A1 (priority 2005-05-19) all pre-date 2008-01-04 and qualify.

Also noted from the prior section and relevant here: the specification's inconsistent "25.7 mm" shear-pin-to-clamp spacing (vs. the 25.4 mm hole pitch). It is not recited in the claims, so it does not affect the §103 analysis of claims 1/15, but it is a potential § 112(en) point if a patentee later relied on that passage.

8. Bottom line

The strongest § 103 position is a three-reference combination — US7506855B2 (recessed attachment interface under a continuous floor) + US4493470A (tool-free, handle-actuated fitting inserted through the rail apertures and clamped beneath the rail, on an integral-multiple hole grid, in a flush/recessed track) + EP0336808A1/US5042787A (flaring-claw clamp engaging behind the hole edge to resist pull-out, admitted prior art by 181's own specification) — with the rationale supplied by the airlines' reconfiguration-demand and uniform-floor requirements that 181 itself recites. The residual vulnerability is the claim-1 "notches"/"vertical movement of the lever" language, which should be tested against the actual claim construction and against GB2406877's disclosure (or its granted equivalent) before relying on this conclusion.