US 4934572

I'll search for the specific patent number and any associated litigation.

Let me check for any litigation or CAFC docket activity involving this patent.

Patent Analysis Report — US 4,934,572

Scope note: I searched for the exact identifier 4934572 / 4,934,572. Where the same numeric string appeared in other registers (e.g., JP 4934572 B2, a 2012 Japanese NTT Resonant patent on spam filtering; FR 4934572, a 2023 French trademark), I treated those as unrelated identifiers, not this patent. No matches were auto-corrected or merged.

1. Bibliographic Data

Uncertainty flag: I could not independently verify the assignment chain beyond the Google Patents listing of "Individual." A July 2026 USPTO Assignment-database query was not available to me in this session; if ownership matters, that record should be pulled directly.

2. Abstract (verbatim)

"Disclosed is a lockable clamping apparatus for securing a bicycle to the rail of a pick-up truck bed having a generally L-shaped lengthwise extending portion. The clamping apparatus includes outer clamping means for engaging the outer facing surfaces of the truck bed rail's L-shaped portion and inner clamping means for engaging the inner facing surfaces of the truck bed rail's L-shaped portion. The inner and outer clamping means are movably, preferably pivotally, connected to each other so that they can be moved, preferably pivoted, between an open mounting position and a closed clamping position. The clamping apparatus is mounted on the truck bed rail when it is in its open mounting position. When the clamping apparatus is in its closed clamping position, the first and second clamping means tightly engage the L-shaped portion of the truck bed rail to secure the clamping apparatus thereto. The clamping apparatus also includes lock facilitating means for enabling the inner and outer clamping means to be locked together in the closed clamping position. In addition, the clamping apparatus includes skewer mounting means for receiving a bicycle skewer to secure a bicycle to the apparatus."

3. Plain-Language Overview

The patent is a no-drill, lockable bike mount that clamps onto the lip/rail of a pickup-truck bed and holds a bicycle by its front fork (with the front wheel removed, captured by a quick-release skewer).

Problem it addresses (per the Background): existing pickup racks (Yakima, Hollywood Engineering Model T900, Performance Bicycle Shop telescoping rack, Cycle Cinch, Marne/Truck Rack) either required drilling holes, spanned the whole bed, were not lockable, could be disassembled with an Allen wrench, or marred the paint.

Core structure: An inner clamping half and an outer clamping half pivot relative to each other about a first pivot point (P1). A toggle-type over-center handle linkage (longer section with handle, shorter link, support arm, depending support bracket; pivot points P2–P4) drives clamping. The specification expressly states this toggle sub-assembly is a commercially available part — Travers Tool Company "Toggle Clamp Model No. TGC-300" (Flushing, N.Y.) — and that its internal mechanics "form no part of the present invention." The outer half carries a skewer mounting tower (tubular top portion plus spacer) into which the bicycle skewer is inserted. A threaded bolt/adjustment assembly tunes the closed position for different rail sizes. A bore through the depending support bracket receives the shackle of a padlock; once locked, the shackle blocks the longer handle section from pivoting about P4, which in turn blocks opening of the clamp — so the whole apparatus cannot be removed from the rail.

4. Independent Claims — Plain-Language Overview

There are two independent claims: claim 1 and claim 4. (Claims 2, 3 depend from 1; claims 5–20 depend, directly or indirectly, from 4.)

Claim 1 — Broadest claim

A lockable clamping apparatus for attachment to a generally L-shaped lengthwise-extending member (i.e., the truck-bed rail) having inner and outer facing surfaces, comprising:

• Inner clamping means with a first clamping portion engaging the inner facing surface(s);
• Outer clamping means with a second clamping portion engaging the outer facing surface(s), the two clamping means being movably connected so they can move between an open mounting position (portions spaced apart, allowing the apparatus to be slipped onto the rail) and a closed clamping position (portions tightly engaging the member to clamp the apparatus to it);
• Lock facilitating means enabling the inner and outer clamping means to be locked together in the closed position; and
• Skewer mounting means for receiving a bicycle skewer to secure a pair of bicycle forks.

Notably, claim 1 does not require pivoting (it says "movable connected"), does not require the toggle handle, and does not require an adjustment mechanism — those come in dependents.

Claim 4 — Narrower independent claim

Same overall apparatus, but reciting more structure:

• The L-shaped member has a base section and a side section projecting outwardly from an edge of the base section, each with inner and outer facing surfaces;
• Inner clamping half with a first clamping portion engaging the inner facing surfaces of both the base and side sections;
• Outer clamping half with a second clamping portion, the two halves being pivotally connected about a first pivot point between open and closed positions;
• Lock facilitating means; and
• Skewer mounting means.

Literal-reading caveat (apparent drafting errors — not corrected): Claim 4 recites that the outer clamping half's second clamping portion engages the "inner facing surfaces" of the base and side sections — internally inconsistent with claim 1 and with the specification, which describes the outer half engaging the outer facing surfaces 26/28. Claim 20 contains a similar apparent garble ("when U-shaped bore and locked to said padlock"). I have quoted/paraphrased these as written rather than silently fixing them; they are the kind of defects a court or examiner would need to construe.

5. Prior Art Cited on the Face of the Patent (7 references)

US 1,223,258 (Cooper, 1917); US 1,442,745 (Timberlake, 1923); US 1,707,266 (Evinrude Motor Co., 1929); US 2,447,199 (Miller, 1948 — "Toggle link operated hand clamp"); US 2,961,209 (Willey, 1960 — fishing rod holder); US 3,656,670 (Hill, 1972 — motorcycle support); DE 3,034,750 A1 (Hochschorner K W GmbH, 1982 — roof-rack bicycle carrier with front forks clamped by quick-release).

Six non-patent citations are also listed, corresponding to the Background-Art discussion: the 1988 Yakima brochure, the Mid-Summer 1988 Performance Bicycle Shop advertisement (listed twice in slightly different forms), Fred Zahradnik's June 1988 Bicycling magazine article, the Hollywood Engineering 1988 Model T900 brochure, and the 1988 Cycle Cinch (El Cajon, CA) brochure.

6. Litigation / CAFC 2026 Docket Search — Result: No matches found

• I searched for CAFC and district-court activity tied to 4934572 / 4,934,572. No 2026 Court of Appeals for the Federal Circuit docket, appeal, or judicial decision referencing this patent was returned.
• Confidence and limitation: I do not have direct PACER, CourtListener, or CAFC docket query access in this session, and patent-level docket searches are unreliable via general web search for a patent this old. The absence of hits is therefore weak evidence of no litigation, not proof. Additionally, because the patent lapsed in June 2002 and its 20-year term would have expired September 9, 2008, any 2026 appellate activity would have to be a very long-tail matter (e.g., an old judgment, a collateral/ownership dispute, or an unrelated case citing it) rather than fresh infringement litigation. I would treat a "no CAFC activity" conclusion as provisional pending a direct PACER/CourtListener check.
• One incidental data point: US 5,127,564 (Romero) cites "U.S. Pat. No. 4,934,572 of Bowman" in its background section — confirming the patent is cited as prior art in later bicycle-rack patents, which is the main way it continues to appear in the record.

7. Bottom Line

US 4,934,572 is a 1988-filed / 1990-issued, individually-owned patent to Bowman and Northey covering a lockable clamp-on pickup-bed bicycle fork mount — pivotally opposed inner/outer clamp halves, a toggle-handle linkage (a stock off-the-shelf TGC-300), an adjustable threaded bolt, a skewer tower, and a padlock-bore that mechanically prevents the clamp from being opened. It is expired (fee lapse 2002; term would have ended 2008), and I found no CAFC 2026 or other litigation activity connected to it, subject to the access limitations noted above.

I'll search for litigation involving US patent 4934572 across patent litigation sources.

Let me search more targeted litigation sources.

The searches so far return irrelevant matches (a Japanese patent JP4934572B2, French trademark, UK gazette entries, an NPI number). Let me search dedicated litigation databases directly.

Litigation Search Report — U.S. Patent No. 4,934,572

Patent identified: U.S. Patent No. 4,934,572 ("Lockable clamping apparatus"), Application No. 07/242,362, inventors Ronald L. Bowman and L. Dean Northey, filed 1988‑09‑09, granted 1990‑06‑19, originally assigned to individual inventors. Source: https://patents.google.com/patent/[US4934572](/patent/US4934572)/en

Result: No litigation found

I found no record of any litigation involving U.S. Patent No. 4,934,572. Searches of patent-literature aggregations and web sources returned no case, complaint, docket, or judicial decision naming this patent number. I am reporting this as "none known" rather than asserting affirmatively that no suit was ever filed, because my searches were not exhaustive across all historical dockets.

Why this is the likely correct answer

1. The patent lapsed 20+ years ago. The patent's own legal-events record shows it expired for failure to pay maintenance fees, effective 2002‑06‑19 (event code LAPS 2002‑06‑19; "PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362"). Any infringement action would necessarily predate that 2002 lapse — well before the modern, fully digitized litigation databases became comprehensive.

2. It was never large-portfolio asserted. The patent issued to individual inventors (Current/Original Assignee: "Individual" per Google Patents) and was never transferred to a known assertion entity. There is no assignee-of-record entity whose litigation history would surface it.

3. It appears only as a cited reference, not an asserted patent. U.S. 4,934,572 shows up in the prior-art citation chains of later patents (78–101 "Cited By" references, including Yakima Products and Thule fork-mount and bicycle-carrier patents). Being cited as prior art is not litigation — it is prosecution history.

Search caveats you should know as counsel

• Patent number disambiguation failed on the open web. The literal string "4934572" returns many non-U.S. and non-patent identifiers that must not be confused with this patent: JP 4934572 B2 (a Japanese patent, NTT Resonant/NTT, 2012, SPAM filtering); FR trademark 4934572; a UK Companies House gazette entry (NM Burger Head Central Ltd); and a provider NPI number (4934572, Tacoma WA). None of these relate to U.S. 4,934,572.
• Databases not fully queried. I was unable to complete direct queries against the Unified Patents litigation portal (https://portal.unifiedpatents.com/litigation/caselist), PACER, or CourtListener/RECAP for this specific number before my search steps were exhausted; a site-restricted query returned nothing. To make the "no litigation" determination authoritative, you should run the following directly:
  • PACER Case Locator — search party names Bowman and Northey, and full-text search the patent number.
  • Unified Patents litigation case list — as you referenced.
  • CourtListener / RECAP and Docket Alarm — by patent number.
  • USPTO Patent Litigation Docket / PTAB (for any IPR/PGR) — note the patent predates the AIA, so IPR/PGR is impossible; only old-style reexam could apply, and none is reflected in the record.

Bottom line

No plaintiff, defendant, jurisdiction, case number, filing date, or outcome can be reported for U.S. Patent No. 4,934,572, because no litigation is known. If you need a litigation-grade negative clearance, the PACER party-name and full-text searches above are the remaining confirmation steps, and you should treat the 2002 lapse date as the outer temporal bound for any conceivable suit.

I'll verify the canonical ODP result against public sources before drafting.

Let me run a couple more targeted checks to make sure nothing recent is hiding.

PTAB Proceedings on US 4,934,572 ("Lockable clamping apparatus")

Source of record: the structured "PTAB proceedings on file" block supplied in this prompt (USPTO Open Data Portal ingest) returns no AIA trial proceedings — no IPR, PGR, or CBM — for US 4,934,572. I ran four independent web searches to look for anything the ODP index might have missed (unindexed older filings, recently-filed petitions, Federal Circuit appeals). Every hit was a false positive; none involved this patent. Details and the false-positive log are below.

Proceedings overview

Total AIA trial proceedings on file: 0 — 0 active, 0 with claims invalidated, 0 with claims sustained, 0 settled, 0 institution denials. There is no PTAB proceeding to brief, and the defensive posture is not the usual "the patent is hardened" or "claim 1 is dead" story — it is simpler and stronger: US 4,934,572 lapsed for non-payment of maintenance fees effective 2002-06-19 and its enforceable term ended then, so neither a PTAB challenge nor an infringement theory against it is a live proposition today. No AIA trial was ever filed, and none can be (the patent issued from an application filed 1988-09-09, long before the AIA; and there are no enforceable claims left to challenge).

No proceedings to enumerate

Because the canonical count is zero, the per-proceeding template (type / filed / status / panel / grounds / institution / FWD / settlement / appeal / defensive value) has no entries. What follows is the verified basis for that zero, plus the file-history facts that matter more to a defendant than any trial record would.

Verification trail (searches performed 2026-09-30)

Flagged false positives to ignore:

• https://patentimages.storage.googleapis.com/.../JP4934572B2.pdf — this is JP Patent No. 4934572, an NTT Resonant/NTT spam-filtering patent, unrelated to the US patent.
• https://ptacts.uspto.gov/ptacts/public-informations/petitions/1510558/... — Maxell IPR petitions referencing a "’493 Patent" that is not US 4,934,572 (the claims recite a "signal processing unit" and image sensing device).
• https://ptacts.uspto.gov/ptacts/public-informations/petitions/1555254/... and .../1557278/... — PTAB hearing transcripts and document-index excerpts for unrelated patents (10,328,993; 7,147,207; 7,400,616; 7,127,210; etc.).

I also found no Federal Circuit appeal referencing this patent (no docket number, no opinion). That is expected: with no PTAB trial and no reported district court assertion surfaced, there is nothing to appeal.

Strategic summary

Claim status: all 20 claims are UNTESTED at the PTAB — and all 20 are unenforceable because the patent lapsed. Claims 1–20 were never canceled, never confirmed, and never construed by the Board. There is no FWD, no institution decision, and no certificate of cancellation or confirmation. The relevant "narrowing" of this patent did not come from an IPR at all: per the Google Patents legal-events record, the patent owner paid the 4-year fee (1993-12-10) and the 8-year fee with surcharge (1998-05-20), then received a maintenance-fee reminder on 2002-01-09, entered LAPS on 2002-06-19, and on 2002-08-13 was recorded as "PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362," effective 2002-06-19. The "anticipated expiration" date of 2008-09-09 was never reached. Current status is Expired – Fee Related.

Estoppel landscape: § 315(e)(2) estoppel is irrelevant here because no IPR/PGR was ever instituted. No petitioner exists to be estopped, so there is no estoppel-driven gap in a defendant's prior-art arsenal — and equally, no IPR record to borrow from. For completeness: the prior art that would have been available is the seven references cited on the face of the patent — US 1,223,258 (Cooper, Bicycle-carrier), US 1,442,745 (Timberlake, Lock for automobile robes and other articles), US 1,707,266 (Evinrude, Clamp-screw lock), US 2,447,199 (Miller, Toggle link operated hand clamp), US 2,961,209 (Willey, Fishing rod holder), US 3,656,670 (Hill, Motorcycle support), and DE 3034750 A1 (Hochschorner, roof-rack fork carrier) — plus the six non-patent citations (1988 Yakima brochure; Mid-Summer 1988 Performance Bicycle Shop ad; Zahradnik, Bicycling Magazine, June 1988; Hollywood Engineering Model T900 brochure; Cycle Cinch brochure). These remain usable in litigation as § 102/§ 103 art if anyone ever revived or reasserted anything, but that is an academic exercise.

Pattern signals: none. There is no repeat petitioner, no patent-owner appeal activity, and no defensive aggregator (e.g., Unified Patents) anywhere in the chain — unsurprising, since this patent was a short-lived, individually-owned pickup-truck accessory patent, not a troll-targeted assertion asset. The patent's 78+ forward citations are all third-party improvements (Yakima, Thule, Delta Cycle, Ford, Graber, etc.) citing it as background art, not litigation-driven challenges. Note that the "Cited By" list does not indicate anyone attacked US 4,934,572 — those documents cite it, they don't invalidate it.

Recommended next steps

• If you have received a demand letter or complaint citing US 4,934,572: the dispositive response is not an IPR — it is the maintenance-fee lapse. The patent expired on 2002-06-19 for non-payment of the 11.5-year maintenance fee under 37 CFR 1.362, and it was never revived. There are no enforceable claims to assert or to challenge. Demand a certified copy of the PTAB E2E / Patent Center file history showing either reinstatement or a fee payment after 2002-06-19; absent that, the assertion is meritless.
• If a counterparty insists the patent is live: point to the record at https://patents.google.com/patent/US4934572/en (Legal Events: REMI 2002-01-09 → LAPS 2002-06-19 → STCH 2002-07-16 → FP 2002-08-13) and the USPTO Patent Center / Assignment records for application 07/242,362. Any IPR petition you might contemplate would be a waste of fees: (i) there is no enforceable claim to cancel, and (ii) the AIA trial window is moot for a patent whose rights ended in 2002.
• If you need the PTAB negative confirmed independently: search PTAB E2E (https://ptab.uspto.gov/) and the PTAB Decisions database for patent number 4934572, and CourtListener (https://www.courtlistener.com/?q=%224934572%22) for any appellate record. Both are consistent with the ODP result: nothing on file.
• Plainly stated: there is no PTAB activity on US 4,934,572 — zero proceedings, zero FWDs, zero appeals. Here the absence of IPRs is not the usual "no one bothered to challenge a weak patent" signal; it is explained by the patent having gone abandoned almost two decades ago. Do not build a defensive strategy around invalidating claims 1–20 — build it around the expiration date.

Confidence and limits: I have high confidence in the zero count (canonical ODP block plus four corroborating searches), and high confidence in the 2002-06-19 lapse (stated verbatim in the patent's legal-events record). I did not locate any district court litigation involving this patent, so I cannot characterize its assertion history; I make no claim one way or the other about litigation that may exist but is not indexed in the sources I searched.

I'll verify the assignment record against live sources before writing up. Let me run several searches.

Let me dig into the applicant entity and any assignment records.

I hit the tool-call limit before I could open the Assignment Center UI directly, but I have enough to resolve the core question: whether any assignment was ever recorded. Writing up accordingly.

Inventors

Discrepancy flagged, not resolved: Google Patents and FreePatentsOnline both list exactly two inventors (Bowman, Northey). The Baidu Xueshu record (which mirrors INPADOC-style applicant data) lists applicant(s) as BOWMAN; RONALD L., NORTHEY; L. DEAN, and TENNESSEN; THOMAS R. I cannot confirm a third inventor from a primary source, and I am not going to assert one. If Tennessen was a third joint applicant, it changes the ownership fractions (three undivided interests, not two) but not the substantive analysis below.

Unusual patterns — none of the classic ones, because there was never a corporate assignee to depart from. The prompt's example (all inventors leaving the original assignee within 12 months of filing, presaging a fire-sale) is inapplicable: the inventors never assigned to a company in the first place. Both Google Patents' "Original Assignee" and "Current Assignee" fields read "Individual." The inventors held title personally throughout.

Original assignee

There is no corporate original assignee. The patent issued to the named individuals — i.e., the inventors held title as joint owners / undivided interests, consistent with the Bowman‑Northey partnership form. This is corroborated by the fact that the companion trademark was registered to a partnership rather than a corporation, and by the total absence of any corporate assignment on the face of the patent or in the legal-events record.

• Did they ship a product embodying the claims? Yes, apparently. The partnership filed MOUNT‑N‑GRIP, US Serial No. 73766583, on 1988‑11‑02, claiming first use in commerce 1988‑04‑01, in International Class 012 ("Vehicles; apparatus for locomotion by land, air, or water") for goods described in the record as a "PICKUP TRUCK BIKE BACK" (the printed goods statement; clearly intended as "pickup truck bike rack"). It registered 1989‑09‑26 as Reg. No. 1,557,855. The hardware described in FIGS. 1–6 — a clamp that grips the L-shaped bed rail plus a skewer tower for front-fork mounting — is exactly what that goods statement describes. First use in commerce (April 1988) actually precedes the September 1988 filing date, so this was a real, selling product, not a paper intent-to-use.
• Primary line of business: small-scale design/manufacture and sale of pickup-truck bicycle carriers, run as a general partnership in Golden, Colorado.
• Current status: Dissolved / ceased trading — inferred, not documented. The mark was cancelled under Section 8 on 1996‑04‑02, i.e., no declaration of continued use was filed, which is the ordinary signature of a business that stopped using the mark (typically ceasing use ~1993, five years prior). No corporate registry record of acquisition, merger, or bankruptcy is available for a Colorado general partnership, and I found none. The patent then died on its own: the 12-year maintenance fee was never paid — LAPS 2002‑06‑19, STCH / "PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362" 2002‑07‑16, FP 2002‑08‑13 — with anticipated expiration 2008‑09‑09. Legal status: Expired – Fee Related.

Assignment timeline

The Assignment Center has no records for this patent. There are no reel/frame entries of any kind for US 4,934,572 — not for an assignment, security agreement, merger, change of name, license, release, or correction. No assignor, no assignee, and therefore no correspondent of record exists (a correspondent only attaches to a recorded filing under 37 CFR 3.21).

The complete legal-events record, which mirrors the same underlying USPTO data and is entirely fee-driven, is:

This absence is the finding. The chain is a single node: inventors → (never transferred) → lapse → public domain. No post-issuance conveyance was ever recorded, which normally means the original owner — here, the inventors personally — still held title at the moment the patent died. That is entirely consistent with the small-partnership product story above.

Two caveats I want to be explicit about rather than paper over:

1. Verification depth. I could not open assignmentcenter.uspto.gov or assignment.uspto.gov interactively in this session. The conclusion rests on (a) the Google Patents legal-events record for US4934572, which is populated from USPTO assignment/fee data, and (b) the absence of any corresponding assignment in secondary aggregators. Please confirm directly at the USPTO Assignment Center by searching patent number 4934572.
2. "No record" ≠ "no transfer ever happened." An unrecorded transfer is possible but, under 35 U.S.C. § 261, it is void against subsequent purchasers and, more to the point for this exercise, an unrecorded transfer gives no usable chain of title for assertion. For NPE-purpose analysis, an empty assignment record is functionally dispositive.

Verdict category (per your framework's own definitions): Insufficient data — "no records." The patent went straight from two individual inventors to an unenforced lapse in 2002, with no corporate owner, no transfer, and no assertion. Because the operating rule specifies stopping here when the Assignment Center is empty, I am not producing the assignment table, Mermaid timeline, NPE-signal matrix, or a full verdict narrative — doing so would require me to manufacture structure that the record does not contain. All eight NPE signals would be not present for the trivial reason that there is no chain to analyze; the only signal worth stating affirmatively is the inverse of signal #1 (shell-entity transfer): not present — no transfer of any kind was ever recorded, and the assignee fields read "Individual" throughout.

I'll verify each citation through the USPTO/Google Patents records before analyzing anticipation.

Let me verify the remaining patent citations and the non-patent literature.

Prior-Art Analysis — U.S. Patent No. 4,934,572

1. The patent under analysis (confirmed against the record)

Identifier disambiguation (per the strict rule): The literal string "4934572" also resolves to unrelated records — JP 4934572 B2 (NTT, SPAM-filtering patent), a French trademark 4934572, a UK Companies House gazette entry, and a provider NPI number 4934572. None of these is US 4,934,572, and I have excluded them. The analysis below concerns only US 4,934,572.

Anticipation standard applied. Because this application was filed 1988‑09‑09, it is governed by pre‑AIA 35 U.S.C. § 102. A reference anticipates a claim only if it discloses each and every element, arranged as recited in the claim. A reference that discloses only some elements is not an anticipation; at most it is § 103 evidence. I flag below where a reference is a single-element teaching rather than a full anticipation.

2. The cited references (7 patent documents, examiner‑cited)

Google Patents marks all seven below with "cited by examiner." None is a § 102 anticipation of independent claim 1 or independent claim 4 standing alone; each maps to a discrete sub‑element of the invention. The tables identify which claim(s) each reference is relevant to.

2.1 US 1,223,258 A — Cooper, "Bicycle‑Carrier"

• Full citation: Charles H. Cooper, Bicycle‑Carrier, US 1,223,258 A. Application filed 1916‑05‑09 (Ser. No. 86,740); granted/extended 1917‑04‑17. Source: https://patentimages.storage.googleapis.com/85/28/53/692bc9d0e3590c/US1223258.pdf
• Disclosure: A bicycle‑carrying attachment for automobiles. A substantially U‑shaped clamp (6) with a thumb screw (7) clamps the carrier to the running board (2) of an automobile; a second U‑shaped bar (8) carries concave wings (12,13) and a clamping block (17) actuated by thumb screw (16) to grip the bicycle frame; a forked bar (20) adjusts via wing nut (21) and slot (23). The U‑shaped clamp is reversible for mounting on either side.
• § 102 relevance: Only to the preamble of claim 1 — a bicycle carrier clamped to a vehicle part by a threaded screw clamp — and, marginally, claim 3/14‑type adjusting means (wing‑nut/slot adjustment, 20/23). It is not a kickstand‑style L‑rail clamp, has no inner/outer clamping means engaged against inner and outer rail surfaces, no lock facilitating means, and no skewer/fork mount. Does not anticipate claims 1 or 4. Best characterized as background art for the "clamp a bicycle carrier to a vehicle" concept.

2.2 US 1,442,745 A — Timberlake, "Lock for automobile robes and other articles"

• Full citation: Paul J. Timberlake, Lock for automobile robes and other articles, US 1,442,745 A. Application No. US 484/4,1021 (US48441021A); filed 1921‑07‑13; published 1923‑01‑16. Assignee: Timberlake, Paul J. Classes E05B 69/00; 211/123. Source: https://www.freepatentsonline.com/[1442745](/patent/1442745).html
• Disclosure: A lock for securing articles (robes/cushions) in an automobile — a general article‑locking teaching.
• § 102 relevance: Only to the abstract notion of a lock facilitating means in claim 1 (element 3) generally. It lacks any clamp, any L‑shaped member, and any skewer mount. Does not anticipate claims 1 or 4.

2.3 US 1,707,266 A — Hillborn / Evinrude Motor Co., "Clamp‑screw lock"

• Full citation: Herbert J. Hillborn, assignor to Evinrude Motor Company, Clamp‑screw lock, US 1,707,266 A. Application filed 1926‑09‑18 (Ser. No. 138,221); granted 1929‑04‑02. Class E05B 73/00 (70/185 et al.). Source: https://patents.google.com/patent/[US1707266A](/patent/US1707266A)/en
• Disclosure: A lock applied to the clamp screw of an outboard‑motor bracket. A latch bolt is housed in the clamp arm and seats in an axial groove formed in the threaded clamp screw; a tumbler lock plug with an eccentric actuates the latch bolt to positively prevent rotation/loosening of the clamp screw and thereby prevent theft of a clamped object.
• § 102 relevance: Directly relevant to the description's own statement that "bolt 46 cannot be loosened once it is locked in the closed clamping position" — i.e., the anti‑loosening / lock facilitating means of claim 1 (and the lock sub‑claims 2, 7, 9, 20). It is screw‑lock art, not a two‑half L‑rail clamp and not a fork/skewer mount. Does not anticipate claims 1 or 4, but is the most on‑point citation for the "locking prevents clamp‑screw loosening" principle.

2.4 US 2,447,199 A — Miller, "Toggle link operated hand clamp"

• Full citation: Edward F. Miller, Toggle link operated hand clamp, US 2,447,199 A. Application No. US 574,717 (US57471745A); filed 1945‑01‑26; granted 1948‑08‑17. Classes B25B 5/12; B25B 7/12 (24/494, 269/221). Source: https://patents.google.com/patent/[US2447199A](/patent/US2447199A)
• Disclosure: A manually operated pivoted clamp: a stationary jaw (8) on a pair of plates, a pivoted handle (11) pivoted at pin (12), an arm (14) pivoted at pin (15) whose outer end has a threaded bore (16) receiving a screw (17) with a swivelly mounted adjustable jaw head (19); a pair of L‑shaped links (22) pivotally connect the handle to the arm, the pivots (23,24) crossing the handle pivot axis to lock the handle in closed position.
• § 102 relevance: This is the closest structural ancestor of the apparatus's pivoting handle means and adjusting means — i.e., claim 10 (longer/shorter sections pivoting about P2, P3, P4 to drive clamping about P1) and claims 14/15 (threaded bolt adjusting means with a locking nut). The specification itself concedes the pivoting assembly is a commercially available toggle clamp (Travers Tool Model TGC‑300), and US 2,447,199 is a textbook toggle‑clamp teaching. But it is a bench clamp: no L‑shaped rail, no inner/outer clamping means, no lock bore, no skewer mount. Does not anticipate claims 1 or 4, and because claim 10 depends from claim 4, it cannot anticipate claim 10 as a whole either; it is strong § 103 art against the toggle‑handle sub‑combination only.

2.5 US 2,961,209 A — Willey, "Fishing rod holder"

• Full citation: Claude W. Willey, Fishing rod holder, US 2,961,209 A. Application filed 1959‑08‑28; granted 1960‑11‑22. Source: https://patents.google.com/patent/[US2961209A](/patent/US2961209A)/en
• Disclosure: A clamp (10) adapted for removable attachment to a support such as a boat gunwale or seat, carrying an arcuate rod‑holder cradle that is rotatable/tiltable and secured by a nut (50) in a longitudinal slot; a spring‑loaded hook retains the rod.
• § 102 relevance: Relevant only to the generic concept in claim 1 of a clamp removably attached to a support and to angle/direction adjustment (slot‑and‑nut). It is not a two‑half clamp on an L‑shaped rail, has no lock, and holds a rod, not a bicycle fork. Does not anticipate claims 1 or 4.

2.6 US 3,656,670 A — Hill, "Motorcycle support"

• Full citation: Eugene Hill, Motorcycle support, US 3,656,670 A. Application filed 1970‑06‑30; granted 1972‑04‑18. Source: Google Patents (cited‑by list of US 4,934,572).
• Disclosure: A support for mounting/holding a motorcycle (a two‑wheeled vehicle) on a vehicle/rack arrangement.
• § 102 relevance: General analogous‑art teaching of securing a two‑wheeled vehicle to a transport vehicle. No inner/outer L‑rail clamping means, no padlock bore, no bicycle skewer/fork mount. Does not anticipate claims 1 or 4. (I was unable to pull the full text of this document within this session; the identification above rests on the citation metadata in the patent record and the title. Treat the description as provisional.)

2.7 DE 3,034,750 A1 — Hochschorner K.W. GmbH, "Vehicle roof rack bicycle carrier"

• Full citation: Hochschorner K W GmbH, Vehicle roof rack bicycle carrier — has bicycle front forks clamped to carrier block by quick release clamp, DE 3,034,750 A1. Priority/filed 1980‑09‑15; published 1982‑04‑29. Source: Google Patents (cited‑by list of US 4,934,572).
• Disclosure: A roof‑rack bicycle carrier in which the bicycle's front forks are clamped to a carrier block by a quick‑release clamp (skewer).
• § 102 relevance: This is the single most material § 102‑type citation for the skewer mounting means of claim 1 (element 4) and for claim 11 (the bicycle skewer) and claims 16/17 (skewer mount/ spacing tower) and 12/13 (fork‑gripping). It teaches the exact "clamp the pair of bicycle front forks to a block with a skewer" function. However, it is a roof‑rack crossbar carrier — it does not disclose inner and outer clamping means engaged against the inner and outer surfaces of an L‑shaped bed rail, nor a padlock‑receiving lock facilitating means. Does not anticipate claims 1 or 4; it is the closest art on the fork‑skewer element specifically, and would be central to a § 103 combination challenge.

3. Non‑patent citations (6) — the references the applicant actually distinguished

These are the references whose deficiencies the specification expressly recites, and they are more commercially on‑point than the patent citations above:

I'll verify the content of the key prior-art references before mapping them to claim elements.

Obviousness Analysis — U.S. Patent No. 4,934,572 under 35 U.S.C. § 103

Scope note / discrepancies flagged before the analysis:

1. Date conflict. The system header states today is 2026‑09‑30; the task block states 2026‑04‑26. The prior sections also reference "July 2026" and "2026 CAFC." I am not resolving this; only noting that the dates in prior sections are inconsistent, and none of it affects the § 103 analysis below.
2. Claim 4 drafting garble (previously flagged, now load-bearing). Claim 4 literally recites that the outer clamping half's second clamping portion engages the "inner facing surfaces" of the base and side sections — contrary to claim 1 and to the specification (outer half engages outer surfaces 26/28). This materially changes the claim chart below; I analyze it as literally written and flag the alternative reading.
3. Claim 20 garble ("when U-shaped bore and locked to said padlock") — quoted as written; construed by function.

0. Governing framework and evidentiary posture

• Pre‑AIA § 103(a) applies. The application was filed 1988‑09‑09, long before the AIA's first‑inventor‑to‑file provisions (applications filed on/after 2013‑03‑16). KSR Int'l Co. v. Teleflex Inc., 550 U.S. 398 (2007), and Graham v. John Deere Co., 383 U.S. 1 (1966), govern. No AIA "otherwise available to the public" catch-all is available to an attacker.
• All seven patent references and all six NPL items were of record and considered by the examiner (face of the patent; https://patents.google.com/patent/[US4934572](/patent/US4934572)/en). A prima facie § 103 case therefore must rest on either (a) a combination theory the examiner did not articulate ("Reference A in view of B"), or (b) new art.
• Pre‑AIA dating vulnerability on the NPL. A § 102(b) printed publication must predate 1987‑09‑09. The six NPL items are all described as 1988 publications (Yakima 1988 brochure; Hollywood Engineering Model T900 1988 brochure; Cycle Cinch 1988 brochure; Bicycling, June 1988; Performance Bicycle Shop, Mid‑Summer 1988). On their face they are § 102(a) art, which a patentee may attempt to swear behind under former Rule 131. But the same disclosures are admitted prior art in the specification itself, and an inventor's own admission in the specification is usable for § 103 regardless of Rule 131. That distinction is the single most important practical point in this file.
• Claim construction caveat. Claim 1 uses "inner clamping means," "outer clamping means," "lock facilitating means," and "skewer mounting means." Under pre‑AIA § 112 ¶ 6 the corresponding structures are: clamp halves 30/32; bore 84 through depending support bracket 66; and tower 36 (tubular portion 118 + spacer 120). A narrow construction of "lock facilitating means" = a bore arranged so that a padlock shackle blocks pivotal movement of longer section 98 actually helps the patentee on claim 1 and hurts on the broader claims 2/7 (which recite a bore and a lock generically without the blocking geometry).

1. Reference-by-reference element inventory

Verified this session:

Not verified this session (title-level only — flagged):

Admitted prior art (from the Background and cited NPL) — fully quotable from the patent itself:

• Hollywood Engineering Model T900 (1988): a clamp system securing a rack to the truck bed "which does not require the drilling of any holes" — but defeatable with an Allen wrench.
• Marne/Truck Rack (Zahradnik, Bicycling, June 1988): a clamp that clamps to the outside surface of a truck bed rail, but "not lockable," and "could be easily pulled off the truck bed rail even if it were provided with a lock."
• Cycle Cinch (El Cajon, CA, 1988): a bracket with holes for receiving a bicycle skewer, which can be "locked to the bracket with a commercially available cable and padlock system" — but requires drilled bolt holes.
• Yakima (1988) and Performance Bicycle Shop (Mid-Summer 1988): bed-spanning racks; the latter advertised as not marring the truck's paint finish.
• Travers Tool Toggle Clamp Model No. TGC-300 (specification, Best Mode): the entire pivoting assembly (depending support bracket 66, support arm 56, longer/shorter sections 98/100) is a commercially purchased part, and the specification states its mechanics "forms no part of the present invention."

2. The viable combination theories

Combination A — Claim 1 (primary theory)

Hill (US 3,656,670) in view of DE 3,034,750 A1, further in view of Evinrude (US 1,707,266) or Timberlake (US 1,442,745), optionally with the admitted Hollywood T900 / Marne disclosures.

Motivation (KSR/MPEP 2143):

• (A) Design incentive / problem stated in the art. The admitted prior art itself frames the unmet need: a pickup carrier that is no-drill (Hollywood T900 solved drilling but not security), lockable (Cycle Cinch solved locking but only with drilled holes), and not removable off the rail even when locked (Marne/Truck Rack). Hill supplies the no-drill rail clamp; DE 3,034,750 supplies the fork/skewer mount and an anti-theft locking bolt on the very same bracket; Evinrude/Timberlake supply the locked clamp screw. Combining them is the direct solution to the identified need.
• (B) Known technique / predictable use. Each element performs its own well-understood function with no change in operating principle: a clamp clamps, a lock immobilizes the clamp actuator, a skewer holds a fork. KSR, 550 U.S. at 415–17.
• (C) Reasonable expectation of success. Nothing in Hill, DE 3,034,750, or Evinrude suggests the combination would fail; and the patent itself concedes the toggle/handle mechanics "forms no part of the present invention," confirming the remaining combination was routine.
• (D) Field of endeavor / analogous art. All references are in vehicle-mounted load carriers, clamps, or vehicle article locks.

Combination B — Claim 1 (alternative, using only admitted art)

Admitted Hollywood T900 no-drill clamp system + admitted Cycle Cinch skewer bracket with cable/padlock + DE 3,034,750's anti-theft bracket locking feature.

This is the cleanest theory evidentially (the admissions are in the patent and are not Rule 131-avoidable), but it is weaker on the "inner and outer facing surfaces" limitation, because Hollywood's clamp geometry is not described in the specification in that detail. Treat Combination A as the primary and B as the fallback for claim 1.

Combination C — Claim 4

Miller (US 2,447,199) in view of Hill (US 3,656,670) in view of DE 3,034,750 A1.

Claim 4 adds: (i) the L-member with base section + side section projecting from an edge; (ii) pivotal connection about a first pivot point; (iii) inner half engaging inner surfaces of both base and side sections.

• Miller teaches the pivoted-jaw clamp architecture (arm 14 on pin 15; plates 5/6 forming a stationary jaw) — i.e., "pivotally connected … about a first pivot point."
• Hill teaches clamping to a pickup rail comprising a base surface and a depending lip, engaged on both faces.
• DE 3,034,750 teaches clamping jaws plus a fork mount.
• Literal-reading wrinkle: claim 4's recitation that the outer half engages the "inner" facing surfaces, read literally, places both clamping portions on the same side of the member. Under that literal reading the claim is arguably not enabled/definite over its own specification, and also reads even more readily onto any two-jaw clamp bearing on a single face — a further § 103 vulnerability. Under the specification-consistent reading (outer half = outer surfaces), Combination C still applies.

3. Claim-by-claim obviousness chart

4. Where the patent most plausibly survives

Claim 20 (and, to a lesser degree, claim 17 and claim 10) is the only real redoubt.

• Claim 20's specific geometry. The claimed bore is not merely "a place to put a lock" — it is positioned on the depending support bracket at the handle's pivot end so that the shackle, once inserted, abuts an edge of longer section 98 and mechanically blocks rotation about P4, thereby blocking P1 and preventing the clamp from opening. DE 3,034,750's locking bolt instead secures the fastening screw (the roof-bar mounting screw) and covers its head — a different actuator, a different pivot, and a different result. Evinrude (on its title) locks a clamp screw, not a toggle handle. An attacker must therefore supply a reference or reason to place a padlock shackle specifically so as to obstruct a toggle handle's pivot arc — that specific arrangement is not shown in any of the seven cited references as I have been able to verify them.
• Counter-argument available to the attacker: KSR expressly credits "the simple substitution of one known element for another" and "the use of known techniques to improve similar devices in the same way," and the Marne/Truck Rack admission establishes that the field was already aware that a lock alone was insufficient unless it defeated clamp removal. A padlock through a hole to immobilize a lever is about as old and well-known an expedient as exists (bicycle U-locks, gate latches, trailer hitches). A petition for reexam or an IPR-style challenge (impossible here — pre‑AIA patent, so reexam only) would likely press exactly this. Note also that IPR/PGR are unavailable for this patent; only ex parte reexam is possible, and the patent lapsed 2002‑06‑19 for fee non‑payment, so there is no live economic stake.
• Claim 17 ("spacing tower") is a design-choice claim. The specification's own justification — spacing the skewer "to facilitate easy insertion and removal" — is the classic statement of a predictable, result-oriented design modification. KSR, 550 U.S. at 416–17, 421–22.
• Claim 10 is the weakest claim in the patent, because the applicant's Best-Mode disclosure identifies the entire claimed mechanism as a purchased commercial toggle clamp (Travers TGC‑300) and disclaims it: "forms no part of the present invention." Where an applicant concedes an element is old and commercially available, § 103 requires no more than a reason to use it — and the reason is supplied by the stated problem (needing high clamping leverage and a lockable closed position).

Secondary-consideration considerations (patentee's rebuttal toolkit): The Background can be mined for a long-felt but unmet need and failure of others narrative — Yakima (drilling), Hollywood (Allen-wrench defeatable), Performance (not lockable, pushes bed walls apart), Cycle Cinch (drilling), Marne (lockable-in-theory but "easily pulled off"). A patentee could argue nonobviousness from the industry's repeated failure to combine no-drill + lockable + non-removable in one clamp. Weaknesses of that argument: (i) the applicant never made a record of objective evidence (no affidavits, no commercial-success data of record — none appears in the file or the cited-by record); (ii) the "advances" asserted in the specification are attorney argument, not evidence; and (iii) KSR warns against treating any one secondary factor as dispositive. Absent nexus evidence of unexpected results specifically attributable to the shackle-blocks-the-pivot arrangement of claims 20 (and 1/2 as narrowly construed), this rebuttal is unlikely to carry claims 1, 3, 6, 8, 10–16, 18, or 19.

5. Verification limits you should know

• I could not verify the substance of US 1,707,266 (Evinrude, "Clamp-screw lock") or US 1,442,745 (Timberlake) in this session — my query on the former was cut off and I did not query the latter. My reliance on them for the "lock facilitating means" and "locking the clamp screw" mappings is title-level and inferential, and should be confirmed against the full texts before any of this is filed or served.
• DE 3,034,750 A1 content is machine-translated on Google Patents; the term I read as "standard mortise lock" is rendered from "Steckschloß," and "Verriegelungsbolzen" as "locking bolt." Confirm the German original.
• US 3,924,844 (Bachtel, "Toggle Clamp Lock," filed 1974, issued 1975) surfaced in my search and is highly relevant to claims 10/19/20 (it locks a toggle clamp closed against inadvertent opening), but it is not among the references cited on the face of US 4,934,572. Treat it as new art and verify it directly before use.