US 280267

I'll verify the record against USPTO/CAFC sources before summarizing. Running targeted searches for the exact number.

Let me check the CAFC 2026 docket and confirm no same-number record exists elsewhere.

US Patent 280,267 — Verification Summary

Search scope. I queried for the literal string 280267 / 280,267 against patent records and for any CAFC 2026 docket or USPTO proceeding tied to that number. Results below are restricted to the exact number. No same-number CAFC 2026 appeal exists; a CAFC-targeted query returned zero results. Findings are drawn from the authoritative full text of US280267 on Google Patents and are independently corroborated by the specification of US 291,443, which recites "my Letters Patent No. 280,267, dated June 26, 1883" (US291443 PDF).

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Bibliographic data

Abstract: None. US patents of this era were not printed with an abstract; the modern front-page abstract requirement did not exist in 1883. The Google Patents record likewise carries no abstract field. The nearest functional substitute is the specification's own statement of scope: the invention "relates to an improvement in the tacking-machines manufactured by the Corrugated Wire Fastening Company," with the modification being "entirely in the cutting-off and carrying device, and in the form of fastener, nail, or tack made by it."

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Plain-language overview of the claims

All three claims are apparatus claims to the geometry of a cooperating pair of cutting jaws. None is dependent — each stands alone. A structural point worth noting: no claim recites the nail itself, even though the specification devotes substantial space to describing it (head h, barb b, tapered shank s, chisel point p). The nail is unclaimed disclosed subject matter.

Claim 1 — Two-jaw cutting combination with waste clearance
A stationary jaw B that has (i) a cutting-edge cavity g′ and (ii) a driving-recess K, combined with a movable jaw A that has (i) a cutting-edge cavity g and (ii) a clearance-recess Z. In plain terms: two grooved jaws that close past one another to shear a piece of nail wire into shape, one jaw having a passage through which the finished nail can be driven, and the other having a cavity into which the cut-off waste drops so it does not lodge in the dies.

Claim 2 — Same jaw pairing, but with a cutting flange instead of a clearance recess
The stationary jaw B (cavity g′ + driving-recess K) combined with a movable jaw A having a cutting cavity g and a projecting cutting flange D. Per the specification, flange D is "beveled to form the over-hanging barb," and it slides against an "oppositely-beveled surface, E" on jaw B. This is the claim that produces the barbed/undercut head of the nail.

Claim 3 — Geometry of the stationary jaw cavity alone
Directed to the stationary jaw B's cavity g′ specifically, characterized by three geometric features: it is vertical on its "dead side," enlarged on its lower side, and has a draw-cutting edge. Purpose stated in the specification: to give "a draw-cut, a good clearance, and an easy drop for the waste." This is a pure single-element geometry claim, narrower in subject matter than claims 1 and 2.

Claim-type note: This is a machine patent with no method claims and no article (nail) claims. Claims 1 and 2 close with "substantially as and for the purposes described," tying them to the disclosed structure.

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Litigation / PTAB / docket status for this exact number

• CAFC 2026 docket: none. No appeal, petition for review, or docket entry exists for 280,267.
• Litigation: none found. The patent expired June 26, 1900, so no post-1900 § 271(a) infringement is legally possible.
• PTAB (IPR/PGR/CBM): zero proceedings. PGR and CBM are categorically unavailable (1883 effective filing date; non-financial subject matter).

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Same-number collisions — explicitly excluded

Per the instruction to return only this number, the following were checked and are not US 280,267:

• US 2,280,184 (Brennan, "Fastener") — its application serial number is 280,267; a serial-number collision, 56 years later, unrelated art.
• "'267 patent" shorthand appearing in modern matters (Nokia, Abbott/Edwards, Sophos, 3D Systems, USG) refers to different patents ending in 267 — not US 280,267.

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Stated uncertainties

1. Filing date. The literal printed text ("April 270, 1883") contains an impossible day-of-month. April 27, 1883 is the near-certain intended date, but I am flagging rather than silently correcting it.
2. Page title. "Hoeace weeks" is a captured-page artifact, not a title of record; the actual title is "Nailing-Machine."
3. No "References Cited" block. Patents of 1883 were not printed with one. The specification cites in its body only two references — Knowlton US 225,527 (Mar. 16, 1880) and US 241,550 (May 17, 1881). Google Patents' "Similar Documents" list is algorithmic similarity, not citations.
4. No judicial or PTAB construction exists for any of claims 1–3 — they have never been construed by any tribunal.
5. Assignee corporate fate. Post-1900 status of Corrugated Wire Fastening Company is undocumented in available sources; no successor identified.
6. Provenance of bibliographic fields. Inventor, assignee, and issue date are drawn from the printed specification text and independently corroborated by US 291,443. The filing date rests on an OCR-degraded string (item 1).

Bottom line: US 280,267 is an 1883 Horace Weeks "Nailing-Machine," assigned pre-issuance to the Corrugated Wire Fastening Company of Hartford, with three apparatus claims on cooperating cutting-jaw geometry (cavities g/g′, driving recess K, clearance recess Z, cutting flange D). It carries no abstract (none was printed in 1883), no recorded litigation, no PTAB activity, and no CAFC 2026 docket — and its term expired June 26, 1900.

I'll search for litigation involving US patent 280267.

Let me try more targeted searches on the specific patent and its historical context.

Let me check litigation databases directly and search for the patent number as a patent-in-suit.

Result: No litigation found involving US Patent 280,267

I ran multiple targeted searches (patent number as-such; number as "patent-in-suit"; assignee/specification name "Corrugated Wire Fastening Company"; inventor "Horace Weeks"; and keyword sets pairing "280,267" with nailing-machine / infringement / equity). I found no case — modern or historical — in which US 280,267 appears as an asserted patent, a counterclaimed patent, an invalidated patent, or otherwise as a patent-in-suit.

What US 280,267 is (for context, from the authoritative patent text)

Because the patent term expired in 1900, any litigation over it would necessarily predate roughly 1900, and would have been brought as an equity infringement suit in a U.S. Circuit Court. Nothing of that kind surfaced.

Important caution about false positives

My searches returned many modern hits for "the '267 patent," but in every instance the apostrophe-prefixed shorthand denotes a different, 20th/21st-century patent whose number happens to end in 267. These are not US 280,267 and should not be reported as litigation involving it:

• Nokia v. Element TV (D. Minn., No. 0:24-cv-04269, filed Nov. 25, 2024) — declaratory judgment of non-infringement of a Nokia "'267 patent" (an H.264/H.265 SEP). Not US 280,267.
• Nokia Technologies Oy v. ASUSTeK Computer Inc. (C.D. Cal., 2:25-cv-03053) — same "'267" family. Not US 280,267.
• Abbott v. Edwards (PTAB/petition documents) — "'267 patent" directed to a PASCAL heart valve device. Not US 280,267.
• Sophos / Webroot–OpenText (W.D. Tex., No. 1:23-cv-…, counterclaims) — "'267 patent" on root-cause analysis for malware. Not US 280,267.
• 3D Systems / Desotech (N.D. Ill., No. 1:08-cv-01531) — "'267 patent" on stereolithography. Not US 280,267.
• USG / National Gypsum (Fed. Cir., "the '267 patent" on perlite board) — Not US 280,267.

Related historical nail-machine litigation I did find (none involves 280,267)

For completeness, contemporaneous 1880s nail-machine cases exist, but none names Patent No. 280,267:

• Cross v. Union Metallic Fastening Co., 29 F. 293 (C.C.D. Mass. Dec. 7, 1886) — infringement of Nagle's Patent No. 308,370 (Eppler nailing machine); patent held void.
• Doig v. Sutherland (N.D.N.Y.) — Doig & Smith box-nailing-machine patents Nos. 276,639 and 342,268.
• Philadelphia Novelty Mfg. Co. v. Weeks, 52 F. 816 (C.C.S.D.N.Y. 1892), aff'd 61 F. 405 (2d Cir. 1894) — stapling machines, Heysinger patents Nos. 226,402 / 274,941. The defendant surname "Weeks" is coincidental; the patents and inventor differ from US 280,267.

Limitations on this answer

• I was unable to complete a direct query of the Unified Patents litigation caselist (portal.unifiedpatents.com/litigation/caselist) or PACER within the search budget; the searches I did run did not surface a Unified Patents or PACER record for 280,267.
• Pre-1900 Circuit Court litigation is poorly digitized. Absence from web-search results does not conclusively prove no 19th-century suit was ever filed — it means no such suit is documented in the sources retrievable here. I will not assert one exists without evidence.
• I am reporting only what the searches evidenced; I have not inferred a case from the patent's history or from its specification's mention of the Knowlton patents.

Bottom line: On the information available, there is no known litigation involving US Patent 280,267 — no plaintiff, defendant, jurisdiction, case number, filing date, or outcome can be reported, because no such case was found.

I'll verify the canonical "no proceedings" block against web sources before writing anything up.

No hits. Let me run a couple more targeted queries to rule out anything indexed under variant formats.

PTAB Proceedings on US 280,267

Proceedings overview

Total AIA trial proceedings on file: 0 — 0 active, 0 claims invalidated, 0 claims sustained, 0 settled, 0 institution denials. The canonical "PTAB proceedings on file" block in this prompt (sourced from the USPTO Open Data Portal) is empty, and my independent web searches returned no IPR, PGR, or CBM petition, institution decision, final written decision, or appeal referencing US 280,267.

Bottom-line defensive posture: This is not a "patent that has survived two IPRs and is hardened," and it is not a "troll with canceled claims." It is a patent that expired on 1900-06-26 — 126 years ago. Expiration, not PTAB attrition, is the complete defense. There is no live claim to invalidate, so the absence of AIA activity is a structural certainty rather than a signal about the patent's strength (this departs from the usual heuristic that "well-asserted patents eventually attract IPRs"; see the caution in Pattern signals below).

Because there are no proceedings, the per-proceeding template (### IPR20XX-##### — Petitioner v. Patent Owner) is inapplicable. I am deliberately not populating it: doing so would require inventing a proceeding number, a petitioner, and a disposition, which the task constraints prohibit.

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Why the list is structurally empty (not merely unsearched)

This is the substantive analysis a defendant actually needs, because it establishes that no future proceeding is realistically possible either.

The IPR point deserves precision, because it is the only door that is legally unlocked: IPR is defined against "the patent," so an 1883 patent is not excluded on its face, and the Board has entertained IPRs on very old claims. But IPR is an estoppel-and-cancellation tool aimed at neutralizing live infringement exposure. Here there is none:

• Term. Pre-URAA term was 17 years from issue (35 U.S.C. § 154, pre-1995). 1883-06-26 + 17 years = 1900-06-26, which matches the "anticipated expiration — 1900-06-26" entry on the record at patents.google.com/patent/US280267/en. (Maintenance fees are irrelevant — they began with patents issued after 1980-12-12.)
• No infringement is possible. 35 U.S.C. § 271(a) reaches acts done "during the term of the patent." Post-1900 conduct cannot infringe US 280,267.
• No § 315(b) trigger. The one-year clock runs from service of a complaint alleging infringement of the patent — an event that cannot lawfully occur for this patent's term.

Net: a petition would be an expensive, discretionary-denial-prone act with no defensive payoff. It would also run straight into the Office's current practice of weighing "the settled expectations of the parties, such as the length of the claims have been in force" as a discretionary-denial consideration (post-2025 Squires-era institution practice). A 143-year-old patent is the extreme case of that factor.

Collisions to guard against (these are NOT US 280,267)

My searches surfaced several records keyed to the number 280,267 that are unrelated and could be mistaken for PTAB or patent hits:

1. US 2,280,184 (Brennan, "Fastener," granted 1942-04-21, ACCo Products) — its application serial number is 280,267, filed 1939-06-21. This is a serial-number collision with the 1883 patent number, and is a plausible source of a false "there's a 280,267 PTAB case" report.
2. JP 280267/1998 — cited as "patent document 3" in EP 1983082 (nonwoven fabrics). A Japanese publication number, unrelated.
3. PCT/US2009/038215 — Baker Hughes wellbore anchor. Unrelated PCT number.
4. The apostrophe-shorthand false positives ("the '267 patent" in Nokia, Abbott/Edwards, Sophos, 3D Systems, USG matters) catalogued in the litigation section of this analysis remain inapplicable here as well.

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Strategic summary

Claim status: all three claims are UNTESTED at the PTAB, and all three are EXPIRED. No FWD has ever addressed claim 1 (jaw B with cutting cavity g′ + driving recess K, combined with movable jaw A with cavity g + clearance recess Z), claim 2 (same combination, with cutting flange D), or claim 3 (fixed jaw cavity g′ vertical on its dead side, enlarged below, with a draw-cutting edge). The claims have also never been construed by the Board. There is no "surviving claim" set to advise a client about, because unenforceability — not unpatentability — resolves every theory. For completeness: claims 1 and 2 are tied to the disclosed structure by their "substantially as described" / "as and for the purposes described" language, so even on the merits they would present narrow scope; but that is academic given expiration.

Estoppel landscape: no § 315(e)(2) estoppel exists, and none is needed. Estoppel under § 315(e)(2) attaches only to a petitioner that obtains a final written decision. With zero FWDs, no party is estopped, and no party's prior-art grounds have been consumed. But the practical question a defendant should ask is different from the usual one: § 315(e)(2) estoppel is irrelevant when there is no accrued liability to defend. Invalidity evidence (including the Knowlton patents US 225,527 and US 241,550, which the specification itself identifies as the starting point) is not "freed up by estoppel" in any meaningful sense — it is simply unnecessary, because the § 271(a) "during the term" requirement is dispositive. The only defenses that matter are term expiration, the § 286 six-year damages limitation, and laches-type and statute-of-limitations arguments in whatever forum the demand arises; no IPR-derived doctrine applies.

Pattern signals: none, because there is no pattern. No petitioner has filed once, let alone twice; there is no General Plastic follow-on-petition scenario; no patent owner appeal exists because no FWD exists (and the Federal Circuit, established 1982, post-dates the patent by a century); and no defensive aggregator is in the chain. Specifically on Unified Patents: it was founded in 2012 and targets modern NPE-asserted patents, not 19th-century expired ones — so the absence of a Unified Patents IPR carries no weight. The correct reading of the "0 proceedings" result is not the standard trope that "quiet patents are validated patents." It is that a patent with no enforceable term generates no PTAB ecosystem.

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Recommended next steps

If you are a defendant and a demand letter cites US 280,267:
Do not commission an IPR. The dispositive response is documentary, not adversarial: US 280,267 issued 1883-06-26 and, under the pre-URAA 17-year term (35 U.S.C. § 154), expired 1900-06-26 — confirmed by the record at https://patents.google.com/patent/US280267/en ("Anticipated expiration 1900-06-26; Expired – Lifetime"). Any asserted act of infringement necessarily postdates the term, so § 271(a) cannot be satisfied. A demand premised on this patent is a strong indicator of a bad-faith or scam demand rather than a legitimate assertion campaign; route it to counsel accordingly, and consider whether it warrants a referral rather than a merits defense.

If you are told a PTAB proceeding on US 280,267 exists:
Demand the proceeding number and verify it directly — PTAB E2E / PTAB Center and the USPTO Patent Trial and Appeal Board decisions page. As of 2026-09-27, there is nothing to find. For any asserted appeal, check CourtListener and the Federal Circuit docket, where an appeal would require a predicate FWD that does not exist. Any proceeding number offered to you should be treated as fabricated until independently confirmed.

Trial-stage milestones: none apply. There is no institution decision deadline, no oral hearing, and no statutory 1-year FWD deadline running, because no petition has been filed and, for the reasons above, no defensible one can be.

Plainly stated: there is no PTAB activity on US 280,267, and there never will be meaningful activity — the patent's claims expired in 1900 and cannot be infringed. If anyone represents otherwise, that representation is unverified at best.

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Verification performed (2026-09-27)

• Canonical block: "PTAB proceedings on file" — USPTO Open Data Portal returns no AIA trial proceedings for this patent. Treated as authoritative.
• Web queries run: "280,267" IPR inter partes review PTAB nailing machine Weeks; US280267 PTAB proceeding petition; "IPR" OR "CBM" OR "PGR" petition patent 280,267 Weeks nailing-machine Corrugated Wire Fastening; PTAB E2E "280267" trial proceeding patent. All returned zero proceedings for US 280,267. The only numeric hits were the unrelated collisions listed above.
• Consistency check with earlier sections: this result is consistent with the litigation section's finding of no CAFC 2026 docket on this number. No contradiction found. Flagged for the record: as previously noted, the Google Patents HTML title renders as "Hoeace weeks" — a transcription artifact of the inventor's name, Horace Weeks — and the specification text reads "Application filed April 270, 1883," which is almost certainly an artifact for 1883-04-27; neither affects the expiration analysis.

I'll research the assignment chain for this 1883 patent. Let me run targeted searches.

Let me check the USPTO assignment records and the corporate history of the assignee.

Note on scope and a procedural flag

Per the task rules, if the Assignment Center shows no records for the patent I should say so plainly and stop after the assignment-timeline section. I did find no retrievable assignment records, and I say so below — but I have also supplied the remaining required sections in abbreviated, data-limited form, because the output spec explicitly requires a verdict and a signal-by-signal table. Where a section is empty, that is stated rather than padded.

Access limitation, stated up front: I could not query https://assignmentcenter.uspto.gov/ or https://assignment.uspto.gov/patent/index.html interactively (both require a live session/JS application). My findings rest on (a) the authoritative patent text, (b) the Google Patents legal-events table for US280267, and (c) targeted web searches. No reel/frame number for this patent was recoverable. I will not invent one. Treat the absence below as "not retrievable in the sources available," not as a positive USPTO certification of "no assignments of record."

One structural point that matters for interpreting the absence: per USPTO's own assignment-database training material, the full-text searchable Patent Assignment database "contains all recorded Patent Assignment information back to August 1980" (https://www.uspto.gov/sites/default/files/documents/Assignment%20Database%20Webinar_20150120.pdf). An 1883 record would fall outside that text-searchable window and would only surface as a legacy reel/frame image with limited indexing — if it is digitized at all. I could not confirm whether pre-1980 records for this patent are indexed in Assignment Center; flagging as uncertain.

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Inventors

Only one inventor is named — the specification's signature block and the patent heading both read "HORACE WEEKS, OF BOSTON, MASS." There is no co-inventor, so the "all inventors departed within 12 months" pattern is not applicable (a single-inventor patent cannot show a coordinated-inventor exodus).

On employment: the specification states the invention "relates to an improvement in the tacking-machines manufactured by the Corrugated Wire Fastening Company," and the nail claimed is described as the nail "[the company] desires to produce." That is consistent with Weeks being an employee, engineer, or contract designer for the company, and with the pre-issuance assignment to it. It is not conclusive — the assignment could equally be an outright sale of a personally-developed invention.

Counter-signal worth recording: the follow-on patent US 291,443 ("Nailing-Machine," issued January 1, 1884, filed October 15, 1883), which describes itself as "an improvement upon that described in my Letters Patent No. 280,267," carries the heading "HORACE WEEKS, OF BOSTON, MASSACHUSETTS" with no assignee notation, unlike 280,267's "ASSIGNOR TO THE CORRUGATED WIRE FASTENING COMPANY." (Source: https://patentimages.storage.googleapis.com/3b/41/84/381a25712a5aa8/US291443.pdf.) If that reading of the printed heading is correct, Weeks retained the follow-on personally. This is weak evidence of an arm's-length rather than employment relationship, and it is a heading-inspection inference, not a recorded assignment fact.

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Original assignee

Corrugated Wire Fastening Company, of Hartford, Connecticut (per the assignment notation on the face of the patent).

• Product shipped: Yes, apparently. The specification treats the machine as the company's existing commercial product ("an improvement in the tacking-machines manufactured by the Corrugated Wire Fastening Company") and the claimed nail as the article that company makes and sells. This is an operating manufacturer's patent, not a licensing vehicle.
• Primary line of business: Manufacture of wire-tacking / wire-fastening machinery and the corrugated wire tacks, nails, and fasteners it produced. The claimed nail's intended use — driving into stock against an "iron bottom of a last" — places it in the boot and shoe industry, consistent with the New England/Connecticut shoe-machinery cluster of the era.
• Current status: Not determinable from the sources retrieved. The company is not an active concern today. I found no evidence of an acquisition, merger, receivership, Chapter 7/11 filing, or asset sale involving it and no successor entity documented anywhere in the record. I explicitly decline to name a successor (e.g., a large shoe-machinery consolidator) without evidence — any such attribution here would be speculation.

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Assignment timeline

No recorded assignment was retrievable. Specifically:

• The Google Patents legal-events table for US280267 (https://patents.google.com/patent/US280267/en) contains only: prior-art date 1883-06-26, application granted, publication, and anticipated expiration 1900-06-26. It lists no "Assignment" events at all — in contrast to post-1980 US patents, where Google Patents routinely surfaces every recorded assignment with reel/frame. This is a meaningful negative.
• No reel/frame, correspondent, or recording date could be recovered from any source.
• The patent's term ran 17 years from the June 26, 1883 grant, expiring June 26, 1900. Any assignment would therefore necessarily predate roughly mid-1900.

The one ownership fact that is documented is textual, not reel/frame-indexed: the printed patent's heading reads "HORACE WEEKS, OF BOSTON, MASS., ASSIGNOR TO THE CORRUGATED WIRE FASTENING COMPANY, OF HARTFORD, CONN." Under 1883 practice (R.S. §4895), an inventor who assigned before issue had the patent issue directly in the assignee's name — which is exactly what this heading notation records. So a pre-issuance assignment to Corrugated Wire Fastening Company demonstrably exists; it simply is not retrievable with a reel/frame identifier here. Its execution date is unknown — only that it predates June 26, 1883.

No post-issuance assignment of any kind — Assignment, Security Agreement, Merger, Change of Name, License, Release, or Correction — was found. Because none was found, there is no correspondent of record to report, and therefore no repeat-correspondent analysis is possible. (The modern "correspondent" field is an artifact of the post-1980 electronic recording system; an 1883 paper recording would not populate it in the modern sense even if the record were digitized.)

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Timeline diagram

timeline
    title Ownership of US 280267
    1883 : Filed 27 Apr by Horace Weeks
         : Issued 26 Jun to Weeks
         : Pre-issue assignment to Corrugated Wire Fastening Co
    1900 : Patent term expires

(The "Filed 27 Apr" date reflects the near-certain reading of the specification's "April 270, 1883" as April 27, 1883 — a transcription artifact flagged in the earlier summary. The pre-issue assignment has no recorded execution date.)

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NPE / troll-pattern signals

Anti-signal worth stating explicitly: the most troll-relevant fact about this patent is chronological. It expired on June 26, 1900 — 82 years before the Federal Circuit existed and roughly a century before the NPE phenomenon the task is designed to detect. A patent that is public-domain prior art cannot be asserted by anyone, so it has been structurally "neutralized" since 1900 regardless of ownership.

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Verdict

Insufficient data — with a strong secondary characterization of defensive / non-asserting by expiration.

The chain is a single, documented pre-issuance assignment from Horace Weeks to Corrugated Wire Fastening Company (recorded on the face of US280267, dated before the June 26, 1883 grant), after which no assignment of any kind is recorded — Google Patents' legal-events table shows only grant, publication, and the 1900 expiration, with no Assignment entries. With no reel/frame entries, no correspondent, no post-issuance transfer, and no litigation naming the patent (per the earlier litigation analysis), there is no evidentiary basis for any NPE finding, and the 1900 term expiry makes modern assertion impossible. Any "shell entity" or asserter inference here would rest on naming speculation alone, which the task rules expressly forbid.

Verification links (search by patent number where the interface permits):

• USPTO Assignment Center — https://assignmentcenter.uspto.gov/
• Legacy USPTO Patent Assignment Search — https://assignment.uspto.gov/patent/index.html
• Authoritative patent record — https://patents.google.com/patent/US280267/en

Recommended next step if a definitive answer is required: request a manual Patent Assignment Abstract of Title (PAAT) for 280,267 from the USPTO, which covers pre-1980 reel/frame records that the online text-searchable database (coverage beginning ~August 1980) does not index. Until that is done, the negative finding above should be read as "no records retrievable," not "no records exist."

I'll search for the specific patent and its cited prior art references.

Let me retrieve the two prior-art patents expressly identified in the US280267 specification.

Let me search specifically for the two Knowlton patents expressly referenced in the US280267 specification.

Scope and method — what the USPTO record for 280267 actually contains

Before giving you the reference list, one structural point must be stated plainly, because it governs the whole answer:

US 280,267 has no "References Cited" section, because patents of 1883 were not printed with one. The modern front-page "(56) References Cited" block, with examiner-cited U.S. patent documents and their §102/§103 designations, did not exist as a printed feature of U.S. patents until well into the 20th century. The Google Patents page for US280267 confirms this: it has fields for Classifications, Prior art keywords (nail, wire, cavity, jaw, cutting), Images, and Landscapes, but no "References Cited" table and no "Cited By" table of the kind modern patents carry. Its "Similar Documents" list is a machine-generated similarity ranking of other nail/staple-machine patents — it is not an examiner citation list and none of those documents is designated as anticipating any claim.

The only documents that 280,267 itself cites as prior art are cited inside the specification body. That creates a distinction you should hold onto for this whole report:

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The prior art expressly cited in US 280,267

The specification states the invention is an improvement on the Corrugated Wire Fastening Company's tacking machines and names them directly:

"These machines are patented by Letters Patent No. 225,527, dated March 16, 1880, and No. 241,550, dated May 17, 1881, to Albion Knowlton, of Boston…"

It then refers to them repeatedly, sometimes by year only:

• "the Knowlton patent of 1880" — the guide-tube through which the wire is fed, "called K in the Knowlton patent of 1880." Clearly US 225,527.
• "the Knowlton patent of 1881" — the cut-off and carrier, "called K in that patent." Clearly US 241,550.
• "the carrier-guides, (F of the Knowlton patent of 1880)" — again US 225,527.

So there are exactly two applicant-cited prior-art references, both Knowlton, both to the same assignee family.

Reference 1 — Knowlton, US 225,527

Reference 2 — Knowlton, US 241,550

Verification caveat — read this. I have confirmed the numbers, dates, inventor, and the role each is assigned from the 280267 specification text itself (and cross-confirmed, for 225,527/241,550, by the parallel recital in Weeks's later US 291,443: "I prefer that described in the Knowlton patents: No. 225,527, dated March 16, 1880, and No. 241,550, dated May 17, 1881"). I have not retrieved the full drawing-and-claim text of 225,527 or 241,550 themselves. Related Knowlton patents that surfaced in searching — US 224,339 (Knowlton, "Nailing-Machine," issued Feb. 10, 1880, filed Dec. 26, 1879) and US 280,190 (Knowlton, "Nailing-Machine," issued June 26, 1883, filed Aug. 30, 1882) — are different patents from 225,527/241,550 and must not be substituted for them. I flag 224,339 in particular as a likely source of confusion, since it is also a Knowlton nailing-machine of February 1880.

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§102 analysis — which claims these references potentially anticipate

Statutory caveat first. 280,267 was granted June 26, 1883, and its application was filed April 27, 1883 (specification literally reads "April 270, 1883" — a transcription artifact flagged in the earlier section). The 35 U.S.C. §102/§103 framework did not exist in 1883; it dates from the Patent Act of 1952. I therefore analyze these references as a modern examiner would, treating them as pre-filing-date printed publications under §102(a)(1)/§102(b) (each issued 1880/1881, i.e., more than one year before the April 1883 filing — so each would also qualify as §102(b) art), and state whether each would anticipate specific claims.

Verified starting position from the 280267 text

280267 states its own novelty window precisely, and it is narrow:

"the modification thereof which constitutes the present invention is entirely in the cutting-off and carrying device, and in the form of fastener, nail, or tack made by it."

And, critically, it concedes overlap:

"the carrier A, herein described, corresponding so far with the Knowlton carrier K of the patent of 1881, has two additional cutting-edges … [and] hence a new function (cutting-off) is given to the carrier-guides, (F of the Knowlton patent of 1880)"

Claim-by-claim

Bottom line on anticipation

Neither cited reference anticipates any of claims 1–3. Both Knowlton patents are, on the face of 280267's own characterization, the starting point rather than the anticipating disclosure. 280267 repeatedly concedes what the Knowlton machine contains (the wire feeder, the guide-tube K, the guides F, the one-place severing carrier K, the driving-bar organization) and then claims the delta: (a) the cooperating two-jaw structure with cutting-edge cavities g/g′, (b) the cutting-flange D and its beveled engagement with surface E to form the barb, (c) the clearance-recess Z, and (d) the draw-cutting cavity geometry of claim 3.

If you need a §102/§103 posture statement: the Knowlton references are best characterized as §102(a)(1)/(b) art that discloses the claimed combination's environment and several of its elements, and the realistic attack on 280267 is obviousness-type (old elements + the conceded Knowlton carrier, with two added cutting edges yielding three cuts) — not anticipation. That is exactly how the specification itself frames the difference ("two additional cutting-edges … hence a new function"). Note also that claims 1 and 2 close with "substantially as and for the purposes described," which ties them to the disclosed structure.

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Reference to avoid — a false citation surface

A search for the bare string "280,267" on the USPTO/Google Patents corpus returns a document whose application serial number is 280,267: US 2,280,184 (Daniel A. Brennan, "Fastener," filed June 21, 1939, issued April 21, 1942, assignor to Acco Products, Inc.). Google Patents renders its priority table as "US280267A US2280184A (en)…", which is a serial-number/patent-number collision, not a citation of US 280,267. It is a paper-fastener patent, filed 56 years after 280267 issued, in an unrelated class. Do not report it as prior art or as a citation for 280267. (The previously-generated summary's collision warnings are hereby extended to cover this serial-number case.)

Similarly excluded as non-citations: the "Similar Documents" list on the US280267 page (US 739,811; US 177,047; US 183,616; US 327,974; US 562,597; US 291,443; US 345,464; US 349,054; US 238,571; US 959,020; and the rest). These are algorithmically similar nail/staple-machine patents, none of which is designated as anticipating any claim of 280267.

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Forward citation (explicitly NOT prior art to 280267)

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Non-patent context that surfaced (neither cited by nor prior art to 280267)

• Cross v. Union Metallic Fastening Co., 29 F. 293 (C.C.D. Mass., Dec. 7, 1886) — Nagle patent No. 308,370 held void; prior Merritt yielding presser-foot; Eppler machine. Not a citation of, and not prior art to, 280267.
• Knowlton, US 224,339 (Feb. 10, 1880, filed Dec. 26, 1879) and Knowlton, US 280,190 (June 26, 1883, filed Aug. 30, 1882) — same inventor, same art, but neither is the 225,527/241,550 pair cited by 280267. US 280,190 is co-dated with 280267 (both June 26, 1883) and could legitimately be raised as §102(e)-type / same-field art in a modern analysis, but 280267 does not cite it.

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Confidence and limitations

1. Confirmed: the two prior-art references cited in US 280,267 are Knowlton US 225,527 (Mar. 16, 1880) and Knowlton US 241,550 (May 17, 1881); both are cited in the specification body; both pre-date the April 1883 filing by more than one year.
2. Confirmed: US 280,267 carries no examiner-cited "References Cited" block; patents of its era were not printed with one.
3. Confirmed: the "Similar Documents" list is not a citation list.
4. Not retrieved: full text/claims of 225,527 and 241,550. My anticipation conclusions above rest on 280267's own detailed characterization of those references (one cut at the top of the carrier K; guide-tube K; guides F), which is unusually explicit and therefore reasonably reliable — but it is the improver's characterization, and I have not independently read the Knowlton claims. If you need claim-level certainty on the Knowlton disclosures, the full texts of 225,527 and 241,550 should be pulled before any anticipation/invalidity opinion is finalized.
5. Explicitly not asserted: no claim that 225,527 or 241,550 individually anticipates any of claims 1–3 of 280,267. On the record available, they do not.

I'll ground this obviousness analysis by verifying the prior-art references available on the page (the "Prior art keywords" and "Similar Documents" lists) and the Knowlton patents the specification itself names.

Let me verify the two Knowlton patents the specification itself names, plus the pre-1883 "Similar Documents" candidates.

Obviousness Analysis — US 280,267 (Horace Weeks, "Nailing-Machine," issued June 26, 1883)

0. Scope, framework, and methodological caveats

What "the Prior Art section of this page" actually contains. The fetched Google Patents record for https://patents.google.com/patent/US280267/en does not contain a conventional "Citations / Cited By" prior-art array. What it does contain is:

1. A "Prior art keywords" field: nail, wire, cavity, jaw, cutting — five terms that, notably, map almost one-to-one onto the claim elements (wire; cavity g/g′; jaw A/B; cutting edges; nail/driving recess). That mapping is itself an admission by the classifier that the claimed subject matter is the cutting geometry of a wire-nail die pair.
2. A "Similar Documents" table of 26 U.S. patents.
3. A "Prior art date" of 1883-06-26 (which is the publication date, not a pre-filing prior-art date — see §1.1 below).
4. Related classification B21G 3/16 — "Pointing; with or without cutting."

Critical filter — most of the "Similar Documents" list is categorically ineligible. The 26-item list is a citation-similarity output, not a prior-art list. Measuring each against 280,267's April 1883 filing, only six pre-date it:

Reproducing the modern "Similar Documents" list as an obviousness combination against an 1883 patent would be a date error of the first order. I use only the six eligible items plus three references I retrieved that are directly on point (Knowlton US 224,339; Knowlton US 280,190; and the two Knowlton patents the specification itself names).

Statutory anachronism — flagged, then set aside. 35 U.S.C. § 103 was enacted in 1952. It did not exist when 280,267 issued; the governing 1883 standard was the "invention" test of Hotchkiss v. Greenwood, 52 U.S. (11 How.) 248 (1850), and Atlantic Works v. Brady, 107 U.S. 192 (1883) (requiring more than "the ordinary skill of the calling"). AIA §§ 102/103 (first-inventor-to-file) also do not apply — this application was filed in 1883. I therefore run the analysis under the modern § 103 / Graham-KSR framework as instructed, using pre-AIA-effective-date reference law for the art-eligibility calls, and I flag where the 1883 standard would produce a different result (§6). Note the modern framework is more hostile to the patentee than the 1883 standard, because KSR Int'l Co. v. Teleflex Inc., 550 U.S. 398 (2007) permits motivation to be supplied by "the nature of the problem," common sense, and predictable variation.

No live controversy. Per the previously generated sections: term expired June 26, 1900; no asserted litigation, no CAFC 2026 docket. This is a retrospective academic validity analysis.

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1. Reference table (with effective dates and eligibility determinations)

Level of ordinary skill (PHOSITA), c. 1883: a machinist/mechanician of ordinary skill in the Boston–Hartford wire tack-and-nail machine trade — the trade of Knowlton (Boston), Woodward (Boston), Weeks (Boston), Eppler, Nagle, and the Corrugated Wire Fastening Company. He is familiar with cam- and lever-driven reciprocating slides, shear die pairs, guide tubes, feed rolls, and nail-delivery noses. He is not an innovator; he is the "ordinary mechanic" of Hotchkiss.

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2. Claim-by-claim difference analysis

All three claims are apparatus claims to jaw geometry. No claim recites the nail itself — an important structural point, because it means the specification's nail (head h, barb b, shank s, point p) is unclaimed subject matter. Any obviousness argument about the nail can only enter through the claims' jaw structures, and only claim 2's flange D produces the barb.

Claim 1 — Jaw B (g′ + driving recess K) + jaw A (g + clearance recess Z)

Only genuine difference over PA-2/PA-3: the cooperative cavities are formed as mating grooves in the two jaws themselves, and a recess Z is added behind g for waste egress. The specification's own characterization of the delta is decisive here:

"there is a change of shape and relation of the cutting and carrying slide, which produces cuts in three places instead of one"

That is a change in the number and geometry of shear edges on an existing cut-and-carry slide — not a change in the principle of operation. The machine still (i) feeds wire, (ii) severs with a reciprocating slide, (iii) carries the fastener under the driver, (iv) drives. Compare Wicke v. Ostrum, 103 U.S. 461 (1880), where non-infringement was found precisely because the defendant changed the machine's principle of operation (vertical → horizontal nailing, eliminating the spring jaws entirely). Weeks did the opposite: he kept the principle and refined the die edge. That is the § 103 fact pattern, not the Wicke fact pattern.

Claim 2 — Jaw B (g′ + K) + jaw A (g + projecting cutting flange D)

Same mapping as claim 1, with flange D substituted for recess Z. Flange D is "beveled to form the over-hanging barb," and it slides against "an oppositely-beveled surface, E," of jaw B.

• PA-5 directly supplies the sliding-beveled-blade relationship: "the dies or cutters D D are so adjusted that their lower shearing-edges shall, as the slide descends, pass parallel to, in close contact with, the inclined faces of the anvil," and the inclination is what "imparts [sic] the points to the nails." A beveled moving blade traveling in close sliding contact over a complementary beveled stationary face is exactly what flange D + surface E is.
• The undercut/barb is the only added wrinkle — and the patentee undercuts his own argument that it is essential: "It will also be observed that the nail may be cut without a bulging or undercut head, if desired." An admitted optional feature added to a known shear-blade geometry is, under KSR, a predictable design variation.
• Pre-1883 tack art recognized heads, points and clinching action as standard desiderata (PA-6 forms "the sides, points, and heads"; PA-7 includes "headers"; PA-8 includes heading dies).

Claim 3 — Jaw B's cavity g′: "vertical on its dead side, enlarged on its lower side, and having a draw-cutting edge"

This is a pure single-element geometry claim — the most vulnerable of the three.

The patentee's own words concede the design objectives are the ones already articulated in the art ("good clearance," "easy drop for the waste"). KSR: "if a technique has been used to improve one device, and a person of ordinary skill in the art would recognize that it would improve similar devices in the same way, using the technique is obvious."

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3. The obviousness case: reference combinations and motivations to combine

Combination I (strongest — disposes of all three claims): PA-2/PA-3 (Knowlton cut-and-carry) + PA-5 (Whysall & Merrick shear-die geometry) [+ PA-4 as corroboration]

Rationale. PA-2/PA-3 supply every functional element except the die-cavity shapes: a reciprocating cutting slide that is simultaneously a carrier, a stationary shear counterpart, a nail passage/driving nose, a driver, and a wire feed. PA-5 supplies precisely the missing geometry — mating shear edges forming a "counterpart" cavity, one straight shear wall with an enlarged/divergent side, an oblique "draw" inclination, and a dedicated clearance opening for the cut-off waste.

Motivations, in KSR terms:

1. Identical field and identical problem. Both are fastener-forming machines in which a blank is severed from a fed length and the severed piece must be freed from the die and delivered downstream. PA-5's opening M and PA-2's carrier K solve the same problem — do not let the severed piece lodge in the die.
2. Articulated, pre-existing design imperative. PA-5 does not merely disclose clearance; it explains why it matters ("otherwise the nail will not be free after shearing, but will stick in the dies"). That is textbook motivation supplied by the prior art itself, not by hindsight.
3. Predictable art. These are slow, single-stroke, all-mechanical machines. The consequence of widening a die cavity, adding a clearance recess, or skewing a cutting edge is mechanically determined. There is no unpredictable technology (no chemistry, no electrical behavior) to defeat a reasonable expectation of success.
4. The patentee's own admission supplies the starting point. The specification says the invention "relates to an improvement in the tacking-machines manufactured by the Corrugated Wire Fastening Company… patented by Letters Patent No. 225,527… and No. 241,550… and the modification thereof, which constitutes the present invention, is entirely in the cutting-off and carrying device." An inventor's identification of the closest prior art and of the entire locus of the alleged advance is an admission that frames the § 103 inquiry.
5. Same-artisan / same-city / same-trade proximity. Knowlton (Boston), Woodward (Boston), Haddock (Pittsburgh), and Weeks (Boston) all worked the same mid-19th-century American nail/tack machinery art; the classification itself (B21G 3/16) confirms "Pointing; with or without cutting" as the relevant art unit.

Result: claim 1 obvious; claim 2 obvious (flange D over beveled face E = PA-5's beveled blades over "inclined faces of the anvil," plus an admitted-optional undercut); claim 3 obvious (the claimed cavity geometry is the PA-5 slot geometry with an enlarged base for exactly the purpose PA-5 states).

Combination II (alternative base for claims 1 and 3): PA-1/PA-2 + PA-6 (Woodward) + PA-3

PA-6 supplies the "enlarged at their base" die cavity and the explicit concept of punched-out "waste," in a tack-making machine. While PA-6 is a plate-punching rather than wire machine, it is nonetheless in the same art of forming nails/tacks and addresses the same waste-disposal problem. Its utility in the combination is narrower: it corroborates that "cavity enlarged on its lower side" and "waste clearance" were known expedients. Standing alone it is the weakest of the three combinations; standing with PA-5 it is cumulative.

Combination III (claim 1's clearance recess Z specifically): PA-1/PA-2 + PA-5's opening M

The specification's stated function of Z — "made large, so that the waste of the wire shall not be held, but may freely drop out when the machine has made its stroke" — is functionally identical to PA-5's opening M. A person of skill seeking to prevent waste from being carried into the driving position has a finite, well-catalogued set of options (drop-through opening; enlarged cavity; lateral clearance recess), and selecting among them is a predictable variation. The patentee even concedes Z is inessential: "The clearance-cavity Z is a convenience rather than a necessity, and may often be sufficiently represented by an easy fit between the jaws behind hole g." A claim element the patentee calls "a convenience" is, by definition, the epitome of an obvious design choice.

Combination IV (claim 2's barb): PA-1/PA-2 + PA-4

PA-4 (Knowlton US 280,190) independently shows a cutting-off die H sliding in a horizontal groove, cooperating with a stationary die f, severing "a nail from the wire g and carr[ying] it into a position under and in line with the driver." That is the core of claims 1 and 2, conceived by another artisan in the same art within the eight months preceding Weeks's filing. Even if PA-4 is not strictly prior art (see §1, eligibility caveat), it is powerful evidence bearing on the level of ordinary skill — contemporaneous, independent arrival at the same cut-and-carry architecture strongly suggests the architecture lay within the routine reach of the art rather than beyond it.

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4. Objective indicia (secondary considerations) — evaluated, not ignored

Graham v. John Deere Co., 383 U.S. 1 (1966), requires that the obviousness case account for secondary considerations. Here they are weak:

• Commercial success. The record indicates the Corrugated Wire Fastening Company machines were a going commercial concern. But there is no nexus evidence linking any commercial success to the specific claimed jaw geometries. The product-level attraction is the barbed, clinching tack — and the tack is not claimed. Nexus must run to the claimed structure.
• Where nexus is strongest — claim 2. Flange D is the element that produces the overhanging barb b, which the specification credits with forming "a clinching-surface beneath the head" and compressing stock to "increase its binding force by friction." A secondary-consideration argument for claim 2 is therefore arguable. It fails, however, on the patentee's own concession that the undercut head is optional, and on the existence of a pre-existing commercial demand for clinching fasteners (PA-6 tacks "cut in continuous strips"; PA-7 headings; PA-8 heading dies).
• Unexpected results. None asserted. The specification describes ordinary, expected shear mechanics and ordinary waste egress — no performance data, no comparative testing, no result that would have surprised a skilled mechanic.
• Long-felt need / failure of others. Not evidenced. The reverse is closer to the truth: the art was crowded with contemporaneous solutions from Knowlton (224,339; 280,190), Eppler, Nagle (US 308,370), Doig & Smith (US 276,639; US 342,268), and Woodward.
• Simultaneous invention. PA-4 (Knowlton, filed Aug. 30, 1882) reaching the same slide-a-die-under-the-driver architecture months before Weeks is a recognized objective indicator of obviousness.
• Licensing / copying. Nothing on the page evidences either.

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5. Contemporaneous judicial confirmation of the obviousness posture

The 1880s–1890s nail-machine jurisprudence the record surfaces repeatedly invalidated precisely this class of "small mechanical refinement" claims:

• Cross v. Union Metallic Fastening Co., 29 F. 293, 293 (C.C.D. Mass. Dec. 7, 1886): "An improvement in the nail-carrier of a nailing-machine, which consists in making the edge of the carrier smooth instead of corrugated, cannot be held to be an invention." Claims 1–4 of Nagle's US 308,370 held void — part anticipated, part "not amounting to an invention." Weeks's "cuts in three places instead of one" is the same genus of change to a nail-carrier edge. (https://law.resource.org/pub/us/case/reporter/F/0029/0029.f.0293.pdf)
• Wicke v. Ostrum, 103 U.S. 461, 468–70 (1880): "Grooved spring jaws were confessedly very old. So were rods of iron with curvilinear projections… and cams, of almost any shape, and treadles, and levers, and adjustable carriages, tables, and slides. The use of these things separately could not be patented." The Court construed the claim narrowly and found no infringement where the defendant changed the machine's principle. (https://tile.loc.gov/storage-services/service/ll/usrep/usrep103/usrep103461/usrep103461.pdf)
• Ausable Horse-Nail Co. v. New Haven Horse-Nail Co., 32 F. 92 (C.C.D. Conn. 1887): claims to carrier/feed structures "must be restricted to the particular elements of the combination therein recited" in view of the state of the art. (https://law.resource.org/pub/us/case/reporter/F/0032/0032.f.0092.pdf)
• Doig v. Sutherland, 87 F. 991, 994–96 (C.C.S.D.N.Y. 1898): "In view of the prior art as shown by the Swan and Rogers patents, I think that this device does not involve invention. All that the complainant did was to fasten a couple of pieces onto the bottom of a guide plate constructed substantially according to the guide plates of the prior art." (https://storage.courtlistener.com/harvard_pdf/[8876393](/patent/8876393).pdf)

That final passage is the most instructive: a court in this exact art, in this exact era, treated the addition of structure to a known guide plate as non-invention — which is the substantive equivalent of the § 103 conclusion reached in §3.

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6. Where the modern § 103 analysis and the 1883 "invention" standard would diverge

I flag this explicitly because the task requires it:

• Under Hotchkiss/Atlantic Works, a court could credit an aggregate "new and useful result" — a machine that simultaneously makes a tapered, barbed, clinching tack, holds it in the carrier, and self-clears its own waste on every stroke — and treat that whole-cycle improvement as rising above "the skill of the calling." The patent's reliance on "substantially as and for the purposes described" in claims 1 and 2 is drafted to invite exactly that reading (it ties the claims to disclosed function).
• Under Graham/KSR, that same functional recitation does the patentee no good on validity; it narrows scope while leaving the underlying geometry, element-by-element, disclosed or obviously varied. The improvement in "cuts in three places instead of one" is, under KSR, a predictable variation of a known structure performing the same function, where the design need (clearance, waste egress, tapered shank) was already articulated in PA-5.
• The claims' functional language ("substantially as described," "as and for the purposes described") thus cuts both ways: it is the strongest defense to infringement under Wicke/Ausable (limiting the claims to the disclosed structure) and no defense at all to obviousness under KSR.

Bottom line of §6: the patent would likely have been upheld in 1883 on the Hotchkiss standard, and would likely be held invalid under modern § 103.

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7. Explicit uncertainties and evidentiary gaps (do not treat as resolved)

1. I could not retrieve the text of US 225,527 or US 241,550. The specification narrates their content (the 1880 patent's guide-tube K and carrier-guides F; the 1881 patent's cut-off/carrier K "sever[ing] the nail or wire and carr[ying] it below the driving-bar"), and those admissions are sufficient to establish them as prior art, but the specific claim-level disclosure of the 1881 patent's jaw arrangement is unverified. If US 241,550 already discloses two cooperating jaw members with grooves, the case shifts from § 103 to § 102 anticipation and strengthens dramatically; if it does not, the § 103 case as constructed in §3 stands on PA-5 and PA-6.
2. PA-4 (US 280,190) is a date-edge case. Filed August 30, 1882 (before Weeks) but published June 26, 1883 (on Weeks's own issue date). Under 1883 law it was almost certainly not prior art against an earlier-filed application; under modern pre-AIA § 102(e) it would be. I therefore use it as corroboration of the level of skill and of contemporaneous independent development, not as a § 103 base reference.
3. I did not retrieve the contents of US 118,429 (1871), US 145,336 (1873), US 238,571 (1881), or US 269,279 (1882) from the eligible portion of the Similar Documents list. These remain candidates for additional § 102/§ 103 art; the OCR dates in the fetched page are truncated/titles are garbled (e.g., "US177047A – meeeick"), so I decline to characterize them beyond their eligibility dates.
4. Google's "Similar Documents" list should not be reported as a prior-art citation list. Eighteen of its twenty-six entries post-date 280,267 and are ineligible. This is a recurring error mode for century-old patents.
5. No litigation exists involving 280,267 (per the previously generated section), so there is no judicial construction, no validity holding, and no estoppel record to weigh. Claims 1–3 have never been construed by any tribunal.

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8. Conclusion

Under 35 U.S.C. § 103 (applied anachronistically to an 1883 patent, and measured against the art eligible as of the April 1883 filing):

• Claim 1 would be obvious over Knowlton US 241,550 / US 224,339 in view of Whysall & Merrick US 177,047 (and cumulatively Woodward US 183,616), the motivation being the art's own articulated need to free the severed nail and clear the waste ("otherwise the nail will not be free after being sheared").
• Claim 2 would be obvious over the same combination, because beveled blades sliding "in close contact with the inclined faces of the anvil" (PA-5) teach flange D over surface E, and the patentee concedes the undercut barb is optional. This claim has the only meaningful nexus to the nail's commercial merit; that nexus is weakened by the optionality concession and by the pre-existing demand for clinching tacks.
• Claim 3 would be obvious over Whysall & Merrick US 177,047 alone (in combination with a wire-nail cutting slide such as PA-2), and secondarily over Woodward US 183,616's dies "enlarged at their base" — the claim being a pure geometry claim whose recited purposes ("a draw-cut, a good clearance, and an easy drop for the waste") are the very purposes PA-5 states.

The patent's own specification supplies the final, decisive admission: "the modification thereof, which constitutes the present invention, is entirely in the cutting-off and carrying device" — and the entire modification is a change in "the shape and relation of the cutting and carrying slide." That is the language of design choice, and under KSR design choices on known elements, made to serve known objectives, are obvious as a matter of law.