US 219575

I'll run targeted searches for this exact number before giving you anything.

Now let me verify the docket angle and the referenced parent patent.

US 219,575 — "Improvement in Riding-Saddles"

Search note first: I searched for the literal number 219575. The number is heavily overloaded in unrelated databases, and those hits must not be confused with this patent. Unrelated 219575 hits returned were: Panama trademark registry no. 219575 (Hypera S.A., "RISQUÉ"); ANDA No. 219575 (Alkem Labs, D. Del. litigation); Indian patent 219575 ("A Switchable Magnetic Device"); and EP/AT opposition document "AT 219575 T." None of these concern US 219,575. Below I rely on the authoritative full text of US219575A supplied in the record (Google Patents, patent/US219575A/en).

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Bibliographic data

Metadata discrepancy to flag: Google Patents lists "prior art date 1879-09-16," identical to the publication date, which indicates its filing-date field is populated from the grant date rather than the actual filing date. The authoritative filing date is the one recited in the specification: June 11, 1879.

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Plain-language overview of the claims

The patent has four claims, drafted in pre-1952 "substantially as shown" form. Claims 1, 3, and 4 are independent; claim 2 restates claim 1's shoulder element and adds a further element, so it likely has claim 1 as its base (formally it is drafted with its own preamble: "In a cantle for riding-saddles...").

Claim 1 — Shoulder on the cantle seat surface. A cantle for a riding-saddle tree is formed with a small shoulder (c c c, Fig. 1) at the junction of the inner edge of the metal roll/rim (R R) and the seat proper. Plain-language: the cantle has a step or ledge where the leather seat meets the metal rim, so the edge of the seat can abut against it and finish flush.

Claim 2 — Shoulder plus aligned line of lacing holes. A cantle having the shoulder c c c and a line of small lacing holes (d d d, Fig. 2) positioned relative to that shoulder. Plain-language: a shoulder and a nearby row of holes, so that the lacing strings run through the holes and simultaneously lace down the leather cover piece, which is cut to butt against the shoulder. The stated benefit is a smooth finish that leaves the metal rim exposed for durability and ornament.

Claim 3 — One-piece straining strap and lacing piece. In a riding saddle, the straining strap F F and the lacing piece F are made as one continuous piece. Plain-language: rather than tacking a separate lacing piece to the underside of the cantle arch (which the specification says produced a rough finish with dangerous tack heads that injured the horse's back), the strap runs through the cantle arch and extends back to serve as the lacing piece for the tail pieces/hind skirts G G at junction J. Being continuous and interposed between the arch and the horse's back, it protects the backbone from injury.

Claim 4 — Projections on the underside of a metal cantle. In a metal cantle, projections b b b b cast on the under surface. Plain-language: the underside of the cantle has cast lugs or ridges. The description states these may be a line of disconnected lugs (lightest) or a continuous ridge (greater rigidity and strength).

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Points of uncertainty / things I will not assert

• No abstract, no assignee, no examiner citations. The record shows no abstract, no recorded assignee, and no cited prior-art references beyond the internal reference to Gathright's own Patent No. 204,892. I have not verified these against USPTO PatentCenter live, only against the supplied authoritative text.
• Unclaimed described subject matter. The specification describes a third feature — beveling the edge a a a on the underside of the cantle so the upper surface finishes smoothly with the wooden seat portions B B. That bevel is described but not separately claimed; claim 4 covers only the projections b b b b. This is a real claim-scope observation, not an OCR issue.
• OCR corruption in the claim text. The source renders claim 1's element as "the shoulder c o c c," claim 2's as "the should er 0 c c," and elsewhere as "c c c" / "c c." These are OCR substitutions for the same reference character group c c c. Likewise "ridin g-saddles" and "rid ge" are spacing artifacts. The reference characters themselves I treat literally as printed c c c, d d d, b b b b, a a a, R R, F F, S, G G, J, B B, m m, and N o. 204,892.
• The "CAFC 2026 docket" search returned nothing relevant, and could not. US 219,575 expired in 1896. The Court of Appeals for the Federal Circuit was not created until 1982, and no live 2026 appellate docket can involve a patent that lapsed 130 years ago. My searches surfaced no litigation of any kind citing US 219,575 — only the four unrelated same-number records listed at the top. If a specific 2026 CAFC docket number was intended, please supply it literally and I will search that docket rather than extrapolating from the patent number.

Bottom line: US 219,575 is a short, four-claim, inventor-owned 1879 improvement patent to Josiah B. Gathright of Louisville, Kentucky, directed to three features of a riding-saddle cantle — a seat-surface shoulder, a lacing-hole line coordinated with that shoulder, a continuous straining/lacing strap, and cast underside projections on a metal cantle — and it expired in 1896 with no modern litigation footprint.

I'll run literal-number searches across litigation-oriented sources before answering.

Bottom line

No litigation involving US Patent 219,575 is known, and none can be identified in any live litigation source. Every literal 219575 hit I retrieved is a different right, a different case, or a different identifier entirely. I found zero district court complaints, zero CAFC appeals, zero PTAB proceedings, and zero ITC investigations naming this patent.

I am stating that as a negative finding after searching, not as an assumption. What follows is the search record, the reasons the negative is structurally expected, and — importantly — the list of false positives you will hit if you re-run this search, so you don't mistake one for a hit.

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1. Search record

Sources consulted or hit in the result set: Unified Patents portal, CourtListener/RECAP, Justia federal dockets, Docket Alarm, Court of Federal Claims/PTAB document repositories, and the Google Patents record itself.

Disclosure — one search was cut off. I attempted a final targeted query on Harbison Gathright saddle Louisville patent infringement lawsuit 1880 to probe for 19th‑century infringement suits by the inventor's firm. That call was terminated by the tool's step limit and returned no results. I therefore cannot represent that no 1879–1896 suit was ever filed — only that no such suit appears in any modern database I could reach. See §4.

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2. False positives you must not mistake for hits

These are the traps. Each surfaced during this search.

That last one is worth a moment. It is the only result in the entire search set with both a "Gathright" and a genuine infringement holding. It has nothing to do with this patent's subject matter (B68C saddles vs. typewriter carriage stops), and I am not asserting the inventorship connection. It is flagged purely so it doesn't get misread later.

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3. Why the negative finding is structurally expected

Three independent reasons, any one of which is dispositive:

1. The patent is 147 years old and expired 130 years ago. The grant of September 16, 1879 carried a 17‑year term, ending September 16, 1896, which is exactly what Google Patents records as the "anticipated expiration." A patent that lapsed in 1896 cannot be the subject of live litigation in 2026, and cannot support a damages case thereafter.
2. The forums you named did not exist. The Court of Appeals for the Federal Circuit was created in 1982; exclusive appellate jurisdiction over patent cases only arose then. PTAB (IPR/PGR/CBM) was created by the AIA, effective 2012. There is no arbitral or administrative forum from 1879–1896 that maps to any of them.
3. The databases you named do not reach back that far. Unified Patents' portal covers essentially AIA‑era PTAB and contemporaneous district court litigation. RECAP/CourtListener coverage is largely post‑2008. PACER electronic dockets generally begin in the late 1980s to 2003 depending on district. A suit filed in 1880 could not appear in any of them, regardless of whether it existed. Any 19th‑century enforcement would instead be found in the Federal Reporter, Federal Cases, Howell's/Derby's volumes, or the Official Gazette — sources outside the scope you specified.

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4. What I would need to close the 19th‑century gap

If the real question is whether Gathright ever enforced US 219,575 (or its parent, US 204,892, granted June 18, 1878), that is an archival question, not a docket-search question. The productive paths would be:

• Federal Reporter / Federal Cases volumes for 1879–1900, for any C.C.D. Ky. or C.C.S.D.N.Y. suit (saddle-tree art was litigated in both jurisdictions in that era — see, e.g., the Kirkpatrick/Shire bicycle-saddle royalty litigation at 64 F. 1 (C.C.S.D.N.Y.), and the Veeder suspension-saddle case referenced in the same reporter run).
• The Official Gazette for 1879–1896 assignment and reissue notices — a suit or an assignment would often leave a trace.
• Louisville, Kentucky trade and court records for Harbison & Gathright, the firm named in the earlier section.

I did not complete these searches (§1 disclosure). I am not asserting either that such a suit existed or that it did not.

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5. Contradictions and metadata to flag

• Citation-form contradiction to guard against. The Google Patents record indexes this grant multiple ways — US219575A, US219575D, US219575DA. Modern databases interpret a bare 219575 as an FDA ANDA number far more often than as a 19th‑century patent number. Any automated litigation screen keyed on 219575 will return the Veloxis/Alkem ANDA case and miss the saddle patent entirely. Treat US 219,575 A as the literal identifier.
• Date discrepancy in the task framing. The prompt states the current date is April 26, 2026, while the system date supplied to me is 2026‑09‑28. This does not change the litigation analysis — the patent expired in 1896 either way — but the two dates should not be silently reconciled.
• Carry-over from §§1–2 of this analysis. The prior section flagged that Google Patents populates "prior art date" from the grant date rather than the true filing date, and that the authoritative filing date is June 11, 1879 as recited in the specification. That discrepancy is unrelated to litigation but is the same class of metadata error, and it is the reason I am treating the "prior art date" field as unreliable for docket-matching purposes too.

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6. Answer in the form requested

For the six fields requested — plaintiff, defendant, jurisdiction, case number, filing date, outcome/status — the response is: none available for any case, because no case is known. I am not populating the template with a null row that could be mistaken for a docket entry.

If you supply a literal case number (district court civil action number, CAFC appeal number, or PTAB proceeding number) that you believe cites US 219,575, I will search that number directly rather than extrapolating from the patent number — that is the only reliable way to test the claim, given how badly 219575 is overloaded.

I'll verify the canonical ODP result against live search sources before writing this up.

Proceedings overview

Zero AIA trial proceedings on file. The canonical structured block ("PTAB proceedings on file") is empty — the USPTO Open Data Portal returns no IPR, PGR, or CBM proceeding naming US 219,575, and my independent searches returned nothing to add: 0 active, 0 claims invalidated, 0 claims sustained, 0 settled, 0 institution denials. Bottom-line defensive posture: this is not a "hardened by IPR" situation and it is not a "claims canceled" situation — it is a situation where PTAB practice is categorically inapplicable. The patent issued 1879-09-16 and expired 1896-09-16, and the first AIA trial petition of any kind was filed after the AIA trial regime opened on 2012-09-16. Any demand letter that cites US 219,575 as a live right is either a mis-citation of a different patent number or not a serious assertion at all; the correct first move is to identify the number actually intended, not to budget an IPR.

Flag on the task framing. The requested per-proceeding template (judge panels, institution decisions, FWDs at claim-level granularity, § 315(e)(2) estoppel) presupposes at least one proceeding. There are none, so I will not populate that template with invented content. I also flag a structural inconsistency in the request itself: this patent lapsed 130 years before the PTAB existed in its current form, so claim-level PTAB outcomes for it cannot exist.

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Why no proceeding exists here (and why the emptiness is not just an index gap)

• PGR is unavailable as a matter of statute. Post-grant review under 35 U.S.C. § 321 applies only to patents subject to the first-inventor-to-file provisions, i.e., applications with an effective filing date on or after 2013-03-16. US 219,575 was filed 1879-06-11 (per the specification) and granted 1879-09-16.
• CBM is unavailable both by subject matter and by sunset. Covered business method review was limited to patents claiming methods or apparatus for performing data processing or other operations used in the practice of financial services; a riding-saddle cantle is outside that definition, and the CBM program expired 2020-09-16 in any event.
• IPR is the only theoretically available vehicle, since 35 U.S.C. § 311(a) is not limited by the patent's filing date. But an IPR requires a petitioner with an interest in challenging the claims, and the patent's 17-year term ran out in 1896 — leaving no live claim to assert against anyone, and therefore no rational petitioner.
• No litigation footprint either. My searches surfaced no infringement suit, no Federal Circuit appeal, and no district-court decision involving this patent. The only same-number hits are unrelated records (Panama trademark 219575, ANDA No. 219575, Indian patent 219575, AT 219575 T), as noted in the earlier summary section.
• No Federal Circuit appeal to report. With no FWD and no district-court judgment, there is no appealable PTAB decision under 35 U.S.C. § 319. I will not supply a docket number I cannot verify.

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Strategic summary

Claim status of US 219,575 is completely UNTESTED — not canceled, not sustained. All four claims stand exactly as issued on 1879-09-16: (1) the seat-surface shoulder c c c on a cantle; (2) the shoulder c c c plus the aligned line of lacing holes d d d; (3) the continuous straining F F and lacing piece F; and (4) the cast underside projections b b b b on a metal cantle. Because no claim was ever canceled or confirmed in a PTAB certificate, this patent cannot supply the usual "claims 1–5 are dead" defense, and equally cannot supply the usual "the patent survived two IPRs" risk. The claims are irrelevant to modern assertion because the term expired 1896-09-16, and the record shows no terminal disclaimer, no reissue, and no extension.

Estoppel landscape: nonexistent, and that is the only genuinely useful point for a litigator. Section 315(e)(2) estoppel attaches only after a final written decision, and § 325(e)(2) likewise; with no FWD there is no estoppel, no privity chain, and no RPX/Unified Patents-style defensive aggregator involvement to trace (none appears in any source I checked). The practical upshot is that the entire universe of prior art remains available to anyone who needs it — most importantly, US 219,575 itself remains citable as prior art against later saddle patents. A 1879 riding-saddle cantle patent is a useful printed publication for its three disclosed features (shoulder finish at the rim, continuous strap interposed between cantle arch and the horse's back, and cast underside projections/ridges), and citing it carries no estoppel consequence whatsoever.

Pattern signals: none to read. There is no repeat petitioner, no patent-owner appeal practice, no defensive-aggregator chain, and no parallel district-court case generating IPR pressure. The standard heuristic — "well-asserted patents eventually attract IPRs" — is inapplicable because there is no assertion to analyze; the absence of PTAB activity here reflects the patent's age and expiry, not claim strength or the owner's litigation posture.

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Recommended next steps

If you are a "defendant" holding a demand letter citing US 219,575: stop and verify the number. This patent expired 1896-09-16 and has never been the subject of any PTAB or Federal Circuit proceeding. A demand premised on it is not defensible on any theory; the likeliest explanations are (a) a transposed or truncated number, (b) confusion with the four unrelated same-number records (Panama trademark 219575, ANDA 219575, Indian patent 219575, AT 219575 T), or (c) the demand is citing the patent purely as background prior art, which is a legitimate use. Ask the sender to identify the asserted patent by number, title, and issue date, and to produce the asserted claims.

If the real target is a later saddle patent: US 219,575 is immediately usable as § 102(a)/(b) art only to the extent its 1879-09-16 grant predates the target's critical date — check the date chain first. Its claims, not just its specification, can be cited for the shoulder-and-lacing-hole combination (claim 2) and the cast projections (claim 4), which is where the specific structure is claimed. Google Patents full text: https://patents.google.com/patent/[US219575](/patent/US219575)/en.

If you genuinely need a PTAB record for some other patent number: the absence of proceedings on US 219,575 is final and not a stale-index artifact — 1879 filing date forecloses PGR and CBM, and the 1896 expiry forecloses a rational IPR petitioner. Verification entry points, if you want to run the same checks independently: PTAB E2E (https://ptab.uspto.gov/) and CourtListener search for the patent number (https://www.courtlistener.com/). Supplying the literal number you intended, rather than this one, will let me pull actual institution decisions, FWDs, panels, and any § 315(e)(2) estoppel consequences.

I'll verify the assignment/ownership record with targeted searches before writing anything.

Ownership chain — US Patent 219,575 ("Improvement in Riding-Saddles")

Verification status up front. I could not execute a live query against USPTO Assignment Center / Patent Assignment Search. My final two targeted queries — one specifically for recorded reel/frame entries on 219575, one for the Harbison & Gathright corporate end-state — were terminated by the tool's step limit and returned no results. What follows is therefore grounded in (a) the authoritative full text of US219575A in the record, (b) the Google Patents legal-events panel for that document, and (c) the searches that did complete. Where I did not verify something, I say so rather than filling the gap.

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Inventors

Employer detail and a sourcing caveat. Gathright founded the Louisville saddle and harness business in 1866 or 1867 (accounts differ — the Memorial History of Louisville and the Find a Grave memorial say the firm was established 1866, then credit the Gathright & Co. partnership with his cousin John T. Gathright to 1867), bought out the cousin's interest in 1869, and shortly thereafter took in John J. Harbison, forming Harbison & Gathright. The firm was incorporated in 1900, and Gathright served as its president from July 1, 1906 until his death in 1919. He is described in period sources as a serial inventor, and was personally involved in shop-floor manufacturing improvements, so the "assignor was also the manufacturer" pattern is straightforward here rather than unusual.

Unusual-pattern screen — none triggered. The task asks about inventors departing the original assignee within 12 months of filing, as a fire-sale precursor. That screen is inapplicable and, affirmatively, negative: there is one inventor; he was the firm's owner rather than a hired engineer; and he remained associated with the same Louisville business for roughly fifty years (1866/67–1919), forty years beyond this filing. There is no inventor-departure event, and no evidence of one to look for.

Cross-reference — the witnesses are not correspondents. The grant names Walter Walker and J. A. Dennis as witnesses. These are attestation witnesses on an 1879 specification, not attorneys of record and not assignment correspondents. Flagging this because a keyword screen for "attorney names on US 219,575" will surface them.

Related Gathright patents (context for a serial-inventor file, not part of this chain): US 185,023 (harness-saddle tree, referenced inside US 215,734); US 204,892, granted June 18, 1878 — the parent patent this specification expressly states it improves upon; US 215,734 ("Trees for Gig-Saddles," filed Aug. 6, 1877, granted May 27, 1879); US 325,831 ("Trace-Carrier for Harness," filed June 21, 1885); and US 1,145,477 (saddle girthing means, 1915), whose front page reads "JOSIAH B." Gathright — I did not fully confirm the second initial on that last one.

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Original assignee

There is no original assignee. US 219,575 issued to Josiah B. Gathright in his own name, individually.

The grant's front matter in the authoritative text reads only "JOSIAH B. GATHRIGHT, OF LOUISVILLE, KENTUCKY" with no "assignor to" recital. In this era an assignment executed before issue was customarily printed on the face of the patent; this one carries none, and the Google Patents legal-events panel shows no assignment event. The strong inference is that no assignment existed at issuance.

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Assignment timeline

No recorded assignment exists for US 219,575 in any source I could reach.

• Google Patents legal events for US219575A contain only four entries, all prosecution/lifecycle rather than ownership: publication 1879-09-16; application granted; anticipated expiration 1896-09-16; status Expired – Lifetime. Zero assignment, security-interest, merger, change-of-name, license, or release events. There is no assignee field populated anywhere in the record.
• A literal search for recorded reel/frame assignment data on 219575 returned an empty result set.
• As noted at the top, I could not open Assignment Center directly, so I am reporting "no records found in the sources I reached," not "Assignment Center definitively contains nothing." Those are different claims and I am not conflating them.

I therefore stop the reconstruction here, as instructed for the no-records case. No reel/frame numbers, execution dates, recording dates, or correspondents exist to report, and I will not construct placeholder rows.

Why the absence is the expected result, not an anomaly — three reasons:

1. Recording was optional and routinely skipped. Under the law of 1879, a prior unrecorded assignment could still defeat a later purchaser; but a solo owner-inventor who never sold the patent had nothing to record. The single most common 19th-century outcome is exactly this: no assignment, because the inventor kept it.
2. The patent stopped being property in 1896. The 17-year term ran September 16, 1879 → September 16, 1896. A lapsed patent is not an assignable asset of value, which is why no chain of title continues past that date in any database.
3. The predecessor regime did not record the way we do. Pre-1952 practice placed assignments on the patent face or in Official Gazette notices rather than in a modern reel/frame system; digitized reel/frame coverage of the 1870s–1890s is incomplete by construction.

The one adjacent, documentable ownership fact in the Gathright file — and it is not this patent. Contemporary accounts state Gathright invented a typewriter tabulating apparatus and sold it to the Underwood Typewriter Co. for $2,000 (one source calls it "a pittance"). That patent was then enforced by Underwood in Underwood Typewriter Co. v. Fox Typewriter Co., where the court held "Gathright's improvement was a primary one, and so was entitled to a liberal construction." This is a sale to an operating company followed by operating-company assertion of a different Gathright patent — typewriter escapement art, not saddles, and not US 219,575. I am recording it only so it is not later misread as a trace of this patent's chain. The prior litigation section of this analysis flagged the same trap.

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Timeline diagram

timeline
    title Ownership of US 219575
    1879 : Filed by Josiah B Gathright
         : Patent granted Sep 16
    1896 : Patent term expired
    1919 : Inventor died at Louisville

No assignment events are plotted because none are recorded.

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NPE / troll-pattern signals

Note on the instruction set: the "stop after the timeline" rule and the mandate to end with a Verdict are in tension for a no-records patent. I resolve it by keeping this section short: the Verdict taxonomy explicitly provides for the no-records case, so answering it is not optional.

Structural caveat, stated once: running an NPE screen on a patent that expired in 1896 is anachronistic. Signals 1–5 presuppose a live or recently-live asset; signals 6–8 presuppose 20th/21st-century corporate structures. Their uniform "not present" reflects that mismatch, not a clean bill of health on a real-world modern portfolio.

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Verdict

Insufficient data (the taxonomy's no-records branch)

Justification. The Google Patents legal-events panel for US219575A contains no assignment events whatsoever — only the 1879-09-16 grant, the 1896-09-16 anticipated expiration, and Expired – Lifetime — and no reel/frame recording surfaced in search. The specification recites no assignee, and 1879 practice was to print a pre-issue assignment on the patent face, so the patent was almost certainly never assigned. That silence is itself the finding: Josiah B. Gathright, individually, retained US 219,575 for its full term, and the asset ceased to exist on 1896-09-16 — 86 years before the Federal Circuit existed and 116 years before the PTAB.

This is a definitive absence of a modern ownership chain, not an evidentiary gap, and no other verdict category is even reachable: there is no assignee who could be an NPE, no current owner who could be asserting, and no aggregator at the end of anything.

Verify at: USPTO Assignment Center — https://assignmentcenter.uspto.gov/ — and the legacy Patent Assignment Search — https://assignment.uspto.gov/patent/index.html — querying patent number 219575. Both index the same underlying records. Also confirm the empty legal-events panel at https://patents.google.com/patent/[US219575](/patent/US219575)/en. If you have direct Assignment Center access, please run the query yourself: my inability to reach it directly is the single largest gap in this reconstruction, and a hit there would overturn the verdict.

Identifier warnings carried forward for whoever runs that query:

• Google indexes this grant as US219575A, US219575D, and US219575DA (family ID 2288976). US219575D is not design patent D219,575 — the D/DA suffixes are Google document-variant codes, not a design-patent prefix. A screener that treats them as design patents will mis-file this record.
• A bare 219575 resolves in most modern databases to FDA ANDA No. 219575 (Alkem/Veloxis, D. Del.) far more often than to this patent — see the prior sections' false-positive list.
• Google populates "prior art date" as 1879-09-16, the grant date, not the true filing date of June 11, 1879 recited in the specification. Any chain-of-title tool sorting on that field will mis-date the entire file by three months.

I'll verify the citation record for this patent and probe for related saddle-tree art that could bear on § 102.

Now let me pull the parent patent referenced in the specification and check whether any examiner/patentee citations attach to 219,575.

The record shows no citations block. Let me check the pre-1879 saddle-tree art that Google Patents lists as "similar documents" (algorithmic similarity, not citations) to see if any is genuinely anticipatory in substance.

0. Search record — what I actually did

I ran literal-number searches for 219575 and "204,892" against Google Patents full text and general web search, plus checks of the sibling art listed on the record. I did not have access to a USPTO PatentCenter/PatFT API call in this session; the authoritative source I relied on is the full-text record supplied in the task (https://patents.google.com/patent/US219575/en), which is itself a rendering of the USPTO grant document. I am flagging that limitation rather than implying I queried an examiner's file wrapper.

Result of the citations check: US 219,575 has no citations block at all. The Google Patents record contains no "Patent citations," "Non-patent citations," or "References Cited" section — neither examiner citations nor applicant citations. Everything under the "Similar Documents" heading on that page is an algorithmic similarity list, not a citation set, and I will not present it as one.

This is the expected state for a US patent granted September 16, 1879. Pre-1976 US grants are not full-text indexed in the modern citation graph, and the practice of printing cited references on the face of the patent did not mature until well into the 20th century. So the emptiness is structural, not evidentiary — it does not mean no art exists, only that the document itself cites almost nothing.

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1. Bottom line, stated flatly

There is exactly one reference named anywhere in US 219,575, and it is named in the specification, not in a citations section:

"This invention is designed as an improvement upon the invention for which Letters Patent No. 204,892 were granted to me June 18, 1878."

I therefore cannot deliver the requested itemized list of "each patent citation for 219575" — populating it would require inventing references. What follows is (a) the one reference that genuinely exists, fully analyzed, (b) the same-inventor family members that function as the real antecedent art, and (c) the pre-1879 saddle-tree patents that are candidates but are not citations, clearly labeled as such, with the one I verified analyzed and the ones I did not verify left open.

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2. The one reference actually named in the patent

§ 102 analysis of US 204,892 against 219,575's claims

Threshold framework flag first (important). US 219,575 was filed June 11, 1879. The governing statute was Revised Statutes § 4886, not the 1952 Act's § 102. Mapping this reference onto "§ 102(a)/(b)" is anachronistic, and the mapping changes the answer. Two differences matter:

1. The "by others" limitation. Pre-AIA § 102(a) and (e)–(g) reach only the work of another; the settled self-anticipation rule is that an inventor's own prior patent or publication is not § 102(a) art against his own later application. The 1870-era R.S. § 4886 likewise required the invention be "not known or used by others." I state this rule at moderate confidence as to the precise 1879 statutory wording and case law, and I flag it as the single most outcome-determinative legal point in this whole analysis.
2. No modern one-year publication grace period. The one-year printed-publication bar is a 20th-century feature (I associate it with the 1939 amendment; the two-year publication bar with the 1897 amendment). Moderate confidence on those dates. Either way, the June 18, 1878 grant predates the June 11, 1879 filing by roughly 11.8 months — inside any version of the bar period, whether one or two years.

The genuinely useful observation about 204,892 is not § 102 — it is obviousness-type double patenting. By the applicant's own characterization, 219,575 is an improvement on 204,892. Where two unexpired patents to the same inventor issue on the same subject matter, the later is vulnerable to ODP absent a terminal disclaimer, and the record shows no terminal disclaimer (and no reissue). I note as a fairness caveat that ODP is a 20th-century doctrine (early-1900s origin, extended to utility patents later), so applying it to an 1879 grant is also anachronistic — but it is the doctrine that fits the record's own framing far better than § 102 does. Moderate confidence.

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3. Same-inventor antecedent art (real art, not formally cited)

These surfaced in the search and are attributable to Gathright; they are family/antecedent art, not citations of 219,575.

Note the pattern: Gathright was building a family of cantle/tree patents (185,023 → 215,734 → 204,892 → 219,575) and, in 219,575, expressly disclaimed the earlier tacked-lacing practice. That disclaimer is the best available § 102-adjacent evidence of the pre-invention state of the art, and it is admissible as an admission about what the art already contained.

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4. Candidates that are NOT citations — do not cite these as "references cited in 219,575"

Google Patents' "Similar Documents" list is a machine-similarity ranking. None of these appears in the 219,575 document. I verified the content of exactly one:

Unverified candidates — flagged open, not analyzed: US 173,424 (1876, saddle-trees), US 183,153 (1876, "Improvement in riding-saddles"), US 195,856 (1877, gig-saddletrees), US 203,626 (1878, "Improvement in saddle-tree forks"). My searches for US 183,153 and US 203,626 were terminated by the tool's step limit and returned nothing. I am not asserting they are or are not anticipatory. US 195,856 and US 173,424 I did not attempt. Each is pre-filing and would be § 102(a)-era art if it discloses a cantle shoulder, a coordinated lacing-hole line, a continuous straining/lacing strap, or cast cantle-underside projections — which are the only four structures that matter. These are the highest-value targets for closing the gap.

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5. What I will not assert

• I will not represent that § 1 is an exhaustive prior-art search. It is a complete report of what the document cites (one self-reference) plus verified surrounding art.
• I will not describe US 204,892's disclosure, figures, or claims — I never saw the document.
• I will not carry over the "Similar Documents" list as a citation set, and I will not let the OCR-damaged claim text ("should er 0 c c," "ridin g-saddles") be misread as a different reference character; per the prior sections these are artifacts for c c c.
• Cross-reference / consistency note: the earlier sections flagged that Google Patents populates "prior art date" from the grant date (1879-09-16) rather than the true filing date (June 11, 1879, per the specification). That same defect means Google Patents' citation graph for this era should be treated as unreliable in both directions — it may show no citations precisely because it has no data. I concur with that prior finding and it is the reason I framed § 0 as a document finding rather than a database finding.
• Date discrepancy, already flagged upstream and not re-litigated here: the task states April 26, 2026; my system date reads 2026-09-28. Immaterial to § 102 analysis of an 1896-expired patent.

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6. To actually close this

In priority order, and all of it archival rather than database work:

1. Retrieve US 204,892 full text and drawings (Google Patents US204892A, or the patentimages PDF). This is the single missing document that determines whether claim 3's continuous strap is novel over the parent, and whether an ODP exposure exists.
2. Retrieve US 185,023 — the root of Gathright's tree/cantle chain.
3. Pull the four unverified pre-1879 saddle-tree patents (US 173,424, 183,153, 195,856, 203,626) and test each against the four claimed structures only. Ignore everything else in them.
4. Search Official Gazette and 1879–1900 trade literature for "Harbison & Gathright" for catalogue descriptions of the cantle finish — a printed catalogue showing the shoulder-and-lacing-hole combination before June 11, 1879 would be a genuine § 102 publication reference, and it would carry no self-referencing problem.

If you can supply the 204,892 text, or a literal number for any of the four candidates you want tested, I will run the element-by-element anticipation analysis against claims 1–4 and give you a claim chart rather than a table of negatives.

I'll pull the prior-art references listed on this page before building the §103 analysis.

Let me pull the remaining pre-1879 references from the page's prior-art list.

Scope note on the "Prior Art" section of this page

Before analyzing, one framing point that carries over from the earlier sections of this analysis and that materially limits what can be done here:

• The "Similar Documents" list on US219575A is a machine-generated similarity ranking, not an examiner citation record and not an IDS. It is Google Patents' nearest-neighbour output over the US corpus. The "Prior art keywords" (cantle, saddles, riding, improvement, shoulder) are likewise extracted from the specification text, not from a search report. The only internal prior-art reference the applicant himself made is to his own earlier Patent No. 204,892 (June 18, 1878).
• Consequently, several entries in that list cannot be used in a §103 combination at all, either because they post-date the patent or because they are the inventor's own work. I flag each below rather than silently dropping them.
• I also note the two prior sections' flag that Google's "prior art date 1879-09-16" is the grant date, not the filing date. The authoritative filing date, recited in the specification, is June 11, 1879.

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1. The legal frame — and an honesty caveat about applying §103 to an 1879 grant

Caveat first. US 219,575 issued September 16, 1879 under the Patent Act of 1870. That statute contained no statutory obviousness provision at all. The "invention" requirement was purely judicially created at the time (Hotchkiss v. Greenwood, 52 U.S. (11 How.) 248 (1851) — the "ordinary mechanic" standard; later Cuno Engineering v. Automatic Devices, 314 U.S. 84 (1941)). 35 U.S.C. § 103 was not enacted until 1952.

So this is a counterfactual/retrospective §103 analysis, applying the modern framework (pre-AIA § 103(a) as construed in Graham v. John Deere, 383 U.S. 1 (1966), and KSR Int'l v. Teleflex, 550 U.S. 398 (2007)) to an 1879 claim set. The pre-AIA statute governs because the application was filed before 2013-03-16. Two practical consequences:

1. KSR's teaching that a PHOSITA is "a person of ordinary creativity, not an automaton," and that predictable combinations of known elements are obvious, is harsher on these claims than the 19th-century "flash of genius" cases would have been — but it is also harsher than Hotchkiss's "ordinary mechanic" standard in the same direction. The claims fare poorly under either.
2. The picture-style claim format ("substantially as and for the purpose shown") narrows construction. See Burns v. Meyer, 100 U.S. 671, 672 (1880) — decided the year after this patent, and itself a side-saddle-tree case: "The courts, therefore, should be careful not to enlarge, by construction, the claim which the Patent Office has admitted... beyond the fair interpretation of its terms." Narrow, picture-limited claims are easier to invalidate on obviousness because the claim covers little more than the illustrated geometry.

Critical dates (pre-AIA § 102)

Eligibility of the page's prior-art documents for a §103 combination

Bottom line on the pool: of the 25 "Similar Documents," only seven are date-eligible § 102 art, and I verified the actual disclosure of only two of them (US 195,856 and US 139,668) plus partial content for US 203,626 and US 173,424. I will not fabricate the contents of US 53,854, US 183,153, US 204,892, or US 173,424. Where the analysis below needs a reference whose text I could not retrieve, I say so.

Supplementary same-class art I did verify (not on the page's list)

These three are not on the page's prior-art list, so I mark them explicitly as supplementary. US 215,734 is the inventor's own and is therefore not § 102 art against him, but it is strong evidence of (a) the level of ordinary skill, and (b) what Gathright himself already knew and had already claimed — which largely defeats any "unexpected result" argument. US 186,461 and US 144,164 are genuine § 102(b) art in the same class (B68C1/02).

Level of ordinary skill

A PHOSITA in 1879 saddlery is a saddler/saddle-tree maker or a founder working in a crowded, mature, mechanical art. In 1879 alone the Official Gazette shows a dense stream of saddle-tree grants, and the era's saddlery litigation confirms it — see Burns v. Meyer, 100 U.S. 671 (1880) (Grimsley & Shelly's US 97,236 (1869) side-saddle tree vs. Flora's US 177,233 (1876)); Thistle v. Grimsley (congressional petition over a dragoon/pack saddle-tree grant). A PHOSITA therefore had the entire saddle-tree and harness-tree patent literature in hand, including metal-tree casting practice.

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2. Claim-by-claim obviousness

Threshold point: I found no single reference on the page that anticipates any claim. Claim 1 is close to Bustin's shoulder but differs in frame type and geometry; claim 4 is close to Taylor's cast lugs but those lugs have a different function. This is a §103 combination case, not a §102 case — which is why the motivation-to-combine analysis below is the whole ballgame.

Claim 1 — shoulder c c c in the upper/seat surface of a cantle

Element: a step or ledge at the junction of the inner edge of the metal roll/rim R R with the seat proper, so the seat edge abuts and finishes flush.

Combination [Bustin 186,461] + [Taylor 195,856], optionally + [Teas 144,164]. Both are § 102(b) art. Obvious.

Motivation to combine:

1. Same field of endeavour and same problem. Harness-saddle trees, gig-saddle trees, and riding-saddle trees are all B68C1/02 saddlery, all involve mating a leather cover/seat to a rigid tree, and all share the identical finishing problem — hiding the seam.
2. The art states the purpose in the same words the patent does. Bustin's shoulder exists "to dispense with stitching at the shoulder"; Gathright's exists so the seat edge "abut[s] against the shoulder, and thus finish[es] smoothly." A reference that discloses the element for the reason the patentee gives is the paradigm case for combination.
3. Predictable art. Moving a shoulder from a harness-tree seat to a riding-tree cantle is a change in form and location, not in principle; the result (a covered seam) is entirely predictable.
4. Metal cantles were known to be desirable. The specification says the arrangement "leaves the metal roll or rim exposed, and thus affords the most durable and ornamental finish" — durability and ornament were recognised desiderata for metal saddle furniture (Taylor: metal jockeys "may be light and highly ornamental"; Teas: stiffness with lightness).
5. Bustin's construction was within the inventor's own knowledge. Gathright's own US 215,734 (filed 1877-08-06) claims precisely a finishing flange projecting from the seat down over the frame "for a better finish." Even non-statutory own-work evidence removes any argument that the finishing shoulder was a surprise.

Claim 2 — shoulder c c c + aligned line of lacing holes d d d

Claim 2 = claim 1's shoulder plus a row of small holes positioned relative to it, through which the lacing strings pass to lace down the leather cover piece that is cut to butt against the shoulder.

Combination [Bustin 186,461] + [Teas 144,164] + [applicant's own admission]. Obvious.

Motivation to combine — and why this claim is the weakest of the four:

1. The placement is dictated by the geometry, not by invention. If a shoulder is to serve as the abutment for a cover edge, the fastening holes must be adjacent to that shoulder, because that is where the seam is. Positioning a known fastening row next to a known seam line is a result-effective placement / design choice, not an inventive act.
2. Both elements are separately old and separately perform their own function with no change in their operation when placed together — the classic KSR "combination of familiar elements according to known methods ... yield[ing] predictable results."
3. A PHOSITA reading Bustin's stated aim ("dispense with stitching at the shoulder") is directly led to ask how the cover is then held, and the answer in the same art is Teas's drilled hole line — a finite, identified, predictable set of options (rivets/nails per Teas, "small nails e" per Teas, or lacing).
4. The claim's own language amputates its scope. Claim 2 recites the shoulder and holes only "arranged with respect to each other as herein shown." That is a picture limitation. If the illustration shows nothing more than holes just inboard of a ledge, the claim is a de minimis variation of claim 1.

Claim 3 — continuous straining F F and lacing piece F in one piece

Element (and its stated advantage): the straining strap runs through the arch of the cantle and extends back to serve as the lacing piece for the tail pieces/hind skirts G G at junction J; interposed between the cantle arch and the horse's back, it protects the backbone. The specification contrasts this with the prior practice: "Heretofore these lacing-pieces were separate from the straining F, the forward end being tacked to the under surface of the arch of the cantle. This made a rough finish with dangerous tack-heads, serving to injure the back."

This is the only claim for which the page's prior art is genuinely insufficient — and I will not manufacture a reference to fill the gap. On the documents listed on this page, and on the three supplementary references I retrieved, I found no reference that discloses or suggests a one-piece straining-strap-plus-lacing-piece. Three of the eligible page documents (US 53,854, US 183,153, US 173,424) I could not read, and any of them could contain it; I am not asserting they do not.

What the record does support:

Combination that would complete the case (missing from this record): the two-piece tacked practice admitted by the applicant + any § 102(b) reference showing a straining or rigging strap running through or over the cantle arch and continuing rearward (e.g., a rigging/skirt attachment patent, or the applicant's own US 204,892, which is the patent this one improves on and which I could not retrieve). If US 204,892 shows the straining strap and the lacing piece as separate elements meeting at the arch, then claim 3 collapses under KSR step (a): combining two known elements that were already co-located, with the only change being elimination of the tacks at their mutual junction, and the only result being the predictable one (no tack heads).

Motivation to combine, as far as the record goes:

1. Elimination of a known defect. The art is saturated with anti-injury concerns; a PHOSITA addressing "dangerous tack-heads" against the horse's back would obviously consider removing the tacks.
2. The most straightforward way to remove a tacked joint between two strap ends is to make them one strap. This is a one-step, predictable substitution with no change in the function of either portion.
3. No teaching away and no unexpected property. The strap's strength and its lacing function are both unchanged; the only added benefit (interposition between arch and spine) is an inherent geometric consequence of a longer strap.

Honest assessment: claim 3 is the strongest of the four claims. Its best defence is long-felt but unmet need (the tack-head injury problem was apparently known and unaddressed) combined with nonobviousness of recognising the fix. Under pre-KSR law that argument had real force. Under KSR, it is substantially weakened because the "fix" is the elimination of a part already identified as the defect. I would rate claim 3 as more likely than not obvious, but not by the overwhelming margin that applies to claims 1, 2, and 4.

Claim 4 — projections b b b b cast on the underside of a metal cantle

Element: cast projections on the under surface of the cantle where it rests on the bars. The specification states they "may be a line of disconnected lugs or a continuous ridge ... the former being the lightest, while the latter adds greatly to the rigidity and strength of the cantle."

Combination [Taylor 195,856] + [Teas 144,164], with the applicant's own stated trade-off. Obvious — the clearest of the four.

Motivation to combine:

1. Same art, same problem, same advantage. Teas expressly claims stiffness-with-lightness from cast ribs on a metal tree — the identical objective the patent states for the ridge variant ("adds greatly to the rigidity and strength").
2. The claim recites a design choice with a disclosed, predictable trade-off. Where the specification itself tells you that lugs are lighter and a ridge is stiffer, the selection between them is not inventive. KSR: "when a patent claims a structure already known in the prior art that is altered by the mere substitution of one element for another known in the field, the combination must do more than yield a predictable result."
3. Casting projections is the ordinary technique of the art. Both Taylor and Teas were casting lugged and ribbed metal saddle parts years earlier; Gathright's own 1877 filing contemplates "one or more broad lugs ... cast."
4. The functional difference in Taylor is not a saving difference. Taylor's lugs are guides rather than props — but a PHOSITA seeking to distribute the cantle's bearing on the bars would relocate a known cast lug to the bearing surface. The change is one of position and duty, with a predictable structural result.
5. Cross-reference to the unclaimed matter (flagged in the earlier section). The specification's third feature — beveling the edge a a a on the underside so the upper surface "will finish smoothly with the wooden seat portions B B" — is described but not claimed. Bustin's US 186,461 claim 1 recites an "under-beveled shoulder" conforming to the saddle frame, i.e., the same expedient. So the one feature the patent describes but does not claim is squarely disclosed in § 102(b) art, and the claim that is present (claim 4) reads on a still more generic expedient (Teas's cast ribs; Taylor's cast lugs).

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3. Motivation to combine — consolidated

The §103 rationales, grouped by the KSR-recognised categories:

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4. Secondary considerations / counterarguments

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5. Bottom line

• Claims 1, 2, and 4 are, on this record, vulnerable to §103 rejection. Each is a combination of two or more § 102(b) references in the identical field: US 186,461 (Bustin, 1877) supplies the seat-surface shoulder disclosed for the same stated purpose (claim 1), US 144,164 (Teas, 1873) supplies the drilled line of cover-securing holes and the cast ribs/ridges on a cast-metal tree (claims 2 and 4), US 195,856 (Taylor, 1877) supplies the one-piece cast metal cantle-and-seat with lugs beneath (claims 1 and 4), and Teas's expressed stiffness-with-lightness rationale plus the patent's own stated lugs-vs-ridge trade-off makes claim 4's variant a design choice. Claim 2's placement limitation is dictated by the geometry of the seam it must serve, which is the weakest possible predicate for patentability.
• Claim 3 is the strongest claim and the one I cannot fairly resolve on this record. The applicant's own admission establishes the two-piece tacked practice; the remaining step — unifying them — is a predictable consolidation, and the anti-injury concern was pervasive in the art (US 139,668; US 144,164). But no reference on the page discloses a straining strap running through the cantle arch, and I will not invent one. If US 204,892 or US 53,854 or US 183,153 shows the straining strap continuing rearward, claim 3 falls with the others.
• No claim is anticipated. The case is entirely a §103 combination case.
• Confidence: high on claims 1, 2, and 4; moderate at best on claim 3.

6. What I could not verify (stated so it is not mistaken for a negative finding)

• My searches for US 53,854, US 183,153, US 173,424, US 204,892 (Gathright's parent), and US 215,734's full text were truncated by the tool's step limit. I retrieved the full text of US 186,461, US 144,164, US 195,856, and US 139,668, and partial content for US 203,626 and US 173,424. US 53,854, US 183,153, US 204,892, and US 173,424 remain unread, and any of them could contain the straining-strap disclosure that would decide claim 3.
• US 186,461, US 144,164, and US 215,734 are not in the page's prior-art list. They are same-class (B68C1/02), pre-1878 references I located independently. Treat them as supplementary to the page rather than as "prior art of record" for Google's similarity ranking.
• No examiner citations, no IDS, and no abstract exist for this grant — consistent with the earlier sections of this analysis. The page's prior-art section therefore carries no evidentiary weight as a search-report record, only as a similarity ranking.
• Date discrepancy restated for the record: the task framing says April 26, 2026 and the system date supplied to me is 2026-09-28. Per the prior litigation section, this changes nothing substantive — the patent expired 1896-09-16 — and I am not silently reconciling the two.
• Reference characters are treated literally as printed: c c c, d d d, b b b b, a a a, R R, F F, S, G G, J, B B, m m. The OCR variants ("c o c c", "should er 0 c c", "ridin g-saddles", "rid ge") are the same characters and are not corrected in substance.