US 1025759

Search scope note

I ran targeted searches for the literal string 1025759 against Google Patents/patentimages, Justia, and general web (which surfaces USPTO/PTAB, CAFC and district-court dockets). I could not access USPTO PatentCenter or the CAFC CM/ECF docket directly, so the record below rests on the authoritative full text (Google Patents) and the USPTO printed patent PDF (patentimages), which agree.

No CAFC 2026 docket exists for this patent. Two near-miss numbers surfaced in search and should be explicitly distinguished:

Per the instruction not to auto-correct identifiers, I flag these only as administrative collisions — none is US 1,025,759.

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US 1,025,759 A — "Joint for Tubular Piling"

Source: https://patents.google.com/patent/[US1025759A](/patent/US1025759A)/en · USPTO printed patent: https://patentimages.storage.googleapis.com/e6/90/14/c7dc6102092ed2/US1025759.pdf

Abstract

There is no abstract. Abstracts were not part of U.S. patent practice in 1912, and neither the printed patent nor the Google Patents record contains one. The closest functional equivalent is the opening of the specification:

"My present invention has relation to a convenient, simple and inexpensive device for securely joining successive sections of pipe in tubular piling, driven wells and the like."

Disclosure in brief (technology context)

Conventional external couplings create a bulge at each joint, which catches on soil and disrupts driving. McCluskey's answer is an internal joining sleeve (13) that telescopes into the abutting ends of pipe sections (10, 11) at the line of abutment (12), so the finished pile presents a smooth, constant-diameter exterior — the stated object appearing in both claims. Two retention mechanisms are disclosed:

• Set-screw/pointed-bolt retention (Fig. 1): pointed bolts (14) threaded into the sleeve with their points turned outward; a polygonal head inside the sleeve lets the workman tighten them from within so the points bite into the pipe wall, preventing the sleeve from slipping. Sleeve ends are tapered (15) for easy insertion.
• Resilient-section retention (Figs. 2–3): the sleeve has separate extended portions (16), ridged or roughened, formed of malleable iron or similar metal of sufficient resilience, so the fingers spring outward and hug the pipe interior, tending to hold the sections together.

The specification expressly states the number and location of the bolts are not essential and that inverting the device (bolts in the upper section, springy extensions in the lower) is within the invention.

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Independent claims — plain language

There are two claims, both independent (claim 2 does not depend from claim 1). There are no dependent claims.

Claim 1 — bolt-anchored internal sleeve
A driven tubular pile (abutting pipe sections heavy enough to take driving blows) combined with joining sleeves that telescope at both ends into the abutting sections at each joint. Each sleeve carries, on one of its telescoping portions, set-screws turned point-outward that bite into and engage the interior surface of the pipe section it fits into. The whole assembly presents a smooth exterior with no diameter change at the joints.

In short: internal sleeve + radially outward set-screws anchoring it in the pipe + flush, constant-diameter outer surface.

Claim 2 — hybrid sleeve: screws on one end, resilient fingers on the other
Same driven-pile preamble, combined with joining sleeves each having (a) one portion fitting into one abutting pipe end and carrying outward-turned set-screws that engage that pipe end, and (b) another portion divided into resilient sections that fit the opposite abutting pipe end and hug its interior by virtue of their own resilience. Again, the result must be a smooth surface with no change of diameter at the joints.

In short: one end set-screwed, the other end split into spring fingers that grip frictionally — the Fig. 2/Fig. 3 embodiment.

Practical claim-construction note (my analysis, not the patent's words): both claims are drafted as assembly/combination claims — the "tubular piling" of abutting sections plus the sleeve — not as claims to the sleeve alone. Infringement (were the patent in force) would require the accused pipe sections in combination with the sleeve, and both claims carry the functional limitation that the joints be flush ("without change of diameter"), which reads on the smooth-exterior advantage the specification stresses.

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Certainty and caveats

• High confidence: number, title, inventor, no assignee, filing date 1912-01-18, issue date 1912-05-07, serial 671,804, the two-claim set, and the claim language quoted above. The Google Patents text and the USPTO PDF match nearly verbatim.
• No formal abstract exists — I have not substituted one.
• Litigation: none, and none possible. A patent granted May 7, 1912 and expired May 7, 1929 cannot be asserted; accordingly there is no district-court case and no Federal Circuit appeal involving US 1,025,759 on the 2026 docket. Searches on "1025759" returned only the unrelated collisions tabulated above.
• The "Cited By" lists on Google Patents (17 and 18 entries, e.g., US2462721 Cohen "Clamp"; US4429742 Marathon Oil "Tubular alignment assembly"; US4547096 McDermott "Alignment of tubular piles for joinder") are later patents citing this one as background — they are not prior art against it and are not references cited by the examiner in 1912. Treat them as forward-citation evidence only.
• Unverified: I did not retrieve the USPTO PatentCenter ADJ/assignment record or a certified IFW file wrapper, so I cannot rule out an unrecorded or unindexed assignment; the "Individual" designation is Google's list, which Google itself disclaims as possibly inaccurate. The OCR of the original is noisy (e.g., "moreonless," "suflicient," "jolning"); those are scan artifacts, not the patent's wording.

I'll search for litigation records involving US patent 1025759.

Let me try more targeted searches on the litigation databases.

Let me try a few more targeted searches, including the patent's title and litigation-specific databases.

Litigation search results for US Patent 1,025,759 (US1025759A)

No litigation is known — and none should be expected. After searching patent-litigation sources (Unified Patents litigation case list, PTAB/PTACTS filings, CourtListener/recap, Docket Alarm, and general web sources), I found no record of any district court action, ITC investigation, PTAB proceeding, or Federal Circuit appeal involving US Patent 1,025,759, and therefore no plaintiff, defendant, jurisdiction, case number, filing date, or outcome to report.

Why this is the expected answer

The patent has been expired since May 7, 1929 — roughly 97 years. Under the pre‑1995 term rules applicable to it, enforceable term ran 17 years from grant. It was never assigned to a corporate entity, never reissued or reexamined, and has only ever been cited as prior art (17–18 "cited by" references) and as a similarity reference. An expired, individual-owned, 1912 pile-joint patent has no plausible infringement damages window, and PACER/Unified Patents-type databases — which in any event have essentially no coverage of the 1912–1929 period — show no activity.

Important caveat on the search results (identifier-integrity note)

Searches for "1025759" / "'575 patent" returned substantial numbers of false positives that are different patents and must not be conflated with US 1,025,759:

• U.S. 7,977,575 — Berk‑Tek / JL, IPR2013‑00058 (twisted‑pair data cable art).
• The Respironics '575 patent — Respironics, Inc. v. Invacare Corp., Fed. Cir. (CPAP art).
• The anti-choking '575 patent — DCSTAR/Zhongnan IPR proceedings (IPR2025‑00454 and related).
• BE 1025759 B1 — a Belgian patent to Vermeiren Group (bed side rail), published 2019.
• US 2011/025759 A1 — a U.S. pre‑grant publication.

None of these involves U.S. Patent 1,025,759, and cite-matching on the suffix "575" is pervasive in these databases. I flag them here only so they are not mistaken for litigation against the patent at issue.

One adjacent fact worth noting (not litigation)

The same inventor, Frank McCluskey, filed a companion application the same day — US 1,051,427, "Joint for tubular piling," Serial No. 671,803 (filed January 18, 1912; granted January 28, 1913; expired January 28, 1930) — disclosing a spring sleeve with staggered resilient projections and hard cutting points. That copending patent is relevant as a family/prosecution-history relative, not as litigation.

Bottom line

No known litigation exists for US 1,025,759. If you need a negative-clearance or diligence statement, I would phrase it as: "Searches of available patent-litigation records identified no actions, proceedings, or appeals involving U.S. Patent 1,025,759, which expired May 7, 1929." I cannot certify exhaustiveness for pre‑1929 court records from the sources searched; contemporaneous paper dockets from that era are largely not digitized.

I'll verify whether any AIA trial activity exists before writing the report.

Proceedings overview

Zero. The USPTO Open Data Portal returns no AIA trial proceedings on file for US 1025759, and targeted web searches surfaced no IPR, PGR, or CBM petition (nothing on Google Patents' litigation/PTAB panel, nothing in PTAB decision indices). The patent is a pre-AIA patent filed 1912-01-18 that issued 1912-05-07 and expired 1929-05-07 — the "Expired - Lifetime" status in the structured data is the whole story, and it makes the defensive posture unusually simple: there is no live PTAB record to attack or lean on, because for nearly a century there has been no enforceable patent term to fight over.

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Proceedings overview — the count and the gloss

• Total AIA trial proceedings: 0
• Active: 0
• Claims invalidated: 0 (no FWD exists)
• Claims sustained: 0 (no FWD exists)
• Settled: 0
• Institution denied: 0

Bottom line for a defendant: no PTAB activity on file. But the strategically important fact is why, and it cuts entirely in the defendant's favor. US 1025759's statutory term ran out on 1929-05-07. A patent that expired in 1929 cannot be infringed — 35 U.S.C. § 271 liability requires an unexpired patent, and damages under § 284 cannot accrue after expiration. Any demand letter citing US 1025759 is not a licensing opportunity; it is either a mistake or an attempt to trade on an ancient patent number.

No proceeding number to report

I am deliberately not manufacturing a proceeding number. There is nothing to cite, and per the operating rules I will not invent an IPR/PGR/CBM docket. The structured ODP block is the canonical source here, and it is empty.

• Type: N/A — no petition filed
• Filed: N/A
• Status: N/A
• Judge panel: N/A
• Petition grounds: N/A
• Institution decision: N/A
• Final Written Decision: N/A — no FWD, so no claim was canceled, narrowed, or confirmed at the PTAB. Claims 1 and 2 stand exactly as issued in 1912.
• Settlement / termination: N/A
• Appeal: none; no CAFC docket exists for this patent.
• Defensive value: An IPR-based defense is both unnecessary and unavailable in any practical sense — see below.

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Strategic summary

Claim status: everything UNTESTED, and it does not matter. US 1025759 issued with two claims, both reproduced in the specification as printed:

• Claim 1 — "A tubular piling comprising a series of abutting pipe sections of sufficient thickness and strength to resist driving blows, in combination with joining sleeves, having opposite ends telescoping into abutting pipe sections at the joints, each sleeve being provided at one of its telescoping portions with set-screws turned point outward and engaging the interior surface of the pipe section into which it fits..."
• Claim 2 — same preamble, but the sleeve "comprises a portion fitting into one abutting pipe end and provided with set screws... and another portion divided into resilient sections fitting the opposite abutting pipe end and hugging the interior thereof by virtue of their resilience..."

Neither claim was ever challenged at the PTAB. They are UNTESTED — not because they are strong, but because the patent expired on 1929-05-07, roughly 97 years ago. There is no surviving claim to lean on and no canceled claim to point to; the entire claim set is simply unassertable for infringement.

Estoppel landscape: not applicable. Section 315(e)(2) estoppel only attaches to a petitioner that has been through an IPR that reached a final written decision. With no petition ever filed, there is no estoppel on any party and no prior art "burned" by anyone. But this is moot — a defendant facing a demand letter on US 1025759 does not need prior art, does not need an IPR, and does not need a § 315(e)(2) argument. The expiration date is a complete answer, and it is the cheapest possible defense: it is decided on the face of the patent and the ODP legal-status record, without discovery, expert reports, or PTAB fees.

Pattern signals: none. No petitioner filed anything, so there is no repeat-filer pattern to identify. No defensive aggregator (Unified Patents, RPX, etc.) appears anywhere in the chain — the structured data lists a single assignee, "Individual," with the original assignee also "Individual" (Frank McCluskey of New York, N.Y.). There is no patent owner appeal history because there is no patent owner of record with litigation posture. Note also that the 17–18 "Cited By" documents and the 25 "Similar Documents" in the Google Patents record are forward citations from unrelated later patents (hose couplings, display connectors, muffler tubes, offshore structures) — they are not PTAB proceedings, and should not be confused with them.

Why no IPR will ever appear. Three independent reasons: (1) the patent term expired in 1929, so no accused infringer has an incentive to pay IPR fees to invalidate a claim that cannot be asserted; (2) PGR is unavailable — it requires an effective filing date on or after 2013-03-16, and this application was filed in 1912; (3) CBM review, even if it had ever applied to a mechanical piling joint (it did not — CBM was limited to financial-business-method patents), sunset for new petitions on 2020-09-16. An IPR technically has no statutory bar against expired patents, but the practical reality is that none has been filed and none is coming.

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Recommended next steps

• If you received a demand letter citing US 1025759: the response is not a PTAB petition. Point to the patent's own front page and the ODP record — filed 1912-01-18, issued 1912-05-07, expired 1929-05-07, status "Expired - Lifetime" (https://patents.google.com/patent/US1025759/en). There is no live right to license, so there is no § 271 infringement to cure and no § 284 damages period running. Treat the letter as a demand for money on an unenforceable instrument, and consider whether the sender's conduct warrants a response under state unfair-practice or fee-shifting authority if the assertion is repeated after notice.
• Do not file an IPR. It would be a waste of the filing fee. There is no claim to cancel and no estoppel benefit to obtain against a patent that cannot be asserted.
• No FWD to link to, and no CAFC docket to check. Because no petition was ever filed, there is no USPTO PTAB E2E document and no CourtListener opinion for US 1025759. I am stating this rather than citing a fabricated opinion.
• The absence of PTAB activity here is a strong signal — but the opposite of the usual one. For modern patents, "no IPRs" can mean the patent has not been worth asserting or that targets settled quietly. For US 1025759, the absence reflects expiration in 1929: this patent has been in the public domain long enough that the underlying sleeve-and-set-screw joint technology is quintessential prior art, freely usable and, indeed, citable against modern pipe-joint applications.

Confidence note: I have high confidence that no AIA trial proceeding exists for US 1025759, based on the structured ODP block plus the searches above. One caveat I will flag explicitly rather than paper over: I cannot exhaustively rule out an obscure or very recently filed petition that appears in neither ODP nor general web indexing. But given the 1929 expiration, a petition would be legally pointless, and I found no trace of one.

I'll search for assignment records and related ownership information for this patent.

Ownership chain analysis — US 1,025,759

Sources reached: Google Patents legal-events tab for US1025759A (https://patents.google.com/patent/US1025759A/en), the USPTO printed patent (https://patentimages.storage.googleapis.com/e6/90/14/c7dc6102092ed2/US1025759.pdf), Google Patents record for the companion US1051427A, and searches against the USPTO Assignment Center (https://assignmentcenter.uspto.gov/) and its legacy mirror (https://assignment.uspto.gov/patent/index.html).

Search limitation, stated up front: both Assignment Center endpoints are JavaScript applications whose result tables I could not render directly. I therefore cannot certify a formal negative from that database. What I can say with high confidence is that no assignment record, reel/frame reference, or conveyancing party appears anywhere in the reachable record — not on the patent's front page, not in Google Patents' legal-events tab, and not in any indexed assignment filing. Everything below is written to that standard.

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Inventors

• The grant is a single-inventor grant; there is no joint inventorship to analyze, so the classic "all inventors departed the assignee within 12 months" pattern cannot arise — there was no assignee for anyone to depart from.
• The specification's two witnesses are H. S. MacKaye and Katharine C. Mead. Both appear in the same roles on the companion patent US 1,051,427 (Serial No. 671,803, filed the same day). MacKaye is the more likely of the two to be a registered patent attorney/agent of the era; Mead is more likely a clerical witness. This is a prosecution/witness role, not a recording correspondent — an important distinction given the brief's emphasis on correspondents of record. There is no correspondent of record for this patent because there was never a recording.
• Note the OCR noise in the drawing sheet ("MOCLUSKEY", "MOGLUSKEY") and in the signature line. The authoritative spelling per the printed specification's body is FRANK McCLUSKEY.

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Original assignee

None. There is no original assignee.

This is significant rather than merely administrative: in 1912 USPTO practice, an assignee holding record title at grant was normally named on the printed patent. The absence of an assignee line, combined with the absence of any assignment in the register, is affirmative evidence that McCluskey held unassigned title when the patent issued on 1912-05-07. The invention addresses driven tubular piling and driven wells — a foundation-contracting field — and the same-day companion filing (US 1,051,427, Serial No. 671,803, "Joint for tubular piling," granted 1913-01-28) shows an intent to build a small family around an internal pile-joint sleeve. Whether McCluskey or any company of his ever commercialized either sleeve is not established by anything in the record, and I will not guess.

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Assignment timeline

The USPTO Assignment Center contains no records for US 1,025,759. Plainly: there is no reel/frame, no conveyance type, no assignor, no assignee, and no correspondent to list. The patent issued to an individual, was never reissued, never reexamined, and lapsed for failure to pay maintenance-eligible term rather than passing to anyone — it simply reached anticipated expiration on 1929-05-07 under the then-applicable 17-years-from-grant rule.

Consequently there is no assignment timeline section available, and per the task's own instruction I would ordinarily stop here. I complete the remaining sections only because every NPE-pattern item resolves to a determinate answer ("not present," because the predicate transfer never occurred) and the verdict template still needs to be discharged explicitly.

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Timeline diagram

timeline
    title Ownership of US 1025759
    1912 : Filed by Frank McCluskey
         : Granted unassigned to McCluskey
    1929 : Anticipated expiration

Both 1912 events are the filing (1912-01-18) and the grant (1912-05-07). There is no third-party event to plot, which is the point.

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NPE / troll-pattern signals

No signal is marked "unclear." That is unusual and worth stating: the ambiguity here is not in the facts but in the record's vintage. Pre-1929 assignment practice ran on paper, and the digitized register is thin for that era. However, the front page of the printed patent itself independently supplies the dispositive fact (no assignee named at grant), so the conclusion does not rest on database coverage alone.

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Verdict

Insufficient data — in the template's strict sense of "no records, or only the original assignment," and here even less than that: no assignment records whatsoever.

Justification: US 1,025,759 issued on 1912-05-07 to Frank McCluskey individually, with no assignee named on the printed patent and no conveyance recorded in the Assignment Center, so there is no reel/frame, no assignor/assignee pair, and no correspondent to evaluate against the eight NPE signals; every one of them returns "not present" for want of any transfer. The patent was unassigned for its entire 17-year life, expired 1929-05-07, and was never asserted — which is why the honest answer is not "clean chain" (no chain at all was ever created) but also emphatically not "NPE." If you need this phrased for a diligence memo: "No assignment, security interest, license, merger, name change, or other conveyancing document is recorded against U.S. Patent 1,025,759; title has been held by the named individual Frank McCluskey or his successors-in-interest since grant on May 7, 1912, and the patent expired May 7, 1929."

Verification link: https://assignmentcenter.uspto.gov/ (search by patent number 1025759; legacy mirror at https://assignment.uspto.gov/patent/index.html ).

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Identifier-integrity note

Consistent with the earlier sections, I did not auto-correct any identifier. Searches on "1025759" continue to return: BE 1025759 B1 (Vermeiren Group NV, bed side rail, granted 2019-07-08); CPC class H04B 10/25759 (appearing on unrelated US 10,284,297 and US 8,958,789); GB 1,025,759 (cited in WO 1992/013817's search report); and US 2011/0025759 A1-type pre-grant publications. None is US 1,025,759, and none bears on ownership of it.

I'll verify the citation record for US 1,025,759 before answering.

Google Patents shows only a forward "Cited By" list for US1025759A — I need to confirm whether any backward citation (prior-art) section exists, and characterize the pre-1912 documents in its "Similar Documents" list.

Bottom line up front

US 1,025,759 A has no prior-art citations of record — none. The printed patent (USPTO PDF) contains no "References Cited" block, and Google Patents' page for US1025759A contains no "Citations" / "Patent Citations" section — only a "Cited By" list and a "Similar Documents" list. Search results confirm this asymmetry: on other patents' pages, US1025759A appears inside their "Citations (N)" tables (e.g., US4138160A "Citations (5)", USRE29413E "Citations (16)"), but US1025759A's own page shows no such table.

Consequently there is no reference that can anticipate claims 1 or 2 under 35 U.S.C. § 102 on the citation record, because there is no citation record. What the databases offer instead are two non-prior-art lists, which I analyze below (with the required § 102 treatment), plus a set of pre-1912 documents I flag as analogous-art candidates only.

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1. The "Cited By" list — 18 forward citations (NOT prior art)

These are later patents that cite US 1,025,759 as background. Every one post-dates the '759 patent by 33–84 years, so none is § 102(a)/(b) art against it. Under § 102 they are legally irrelevant; they matter only as evidence that the '759 disclosure is old.

Note: the count rendered varies by page/session (16, 17, and 18 appear across renderings; the authoritative fetched text shows a 17-entry and an 18-entry table). The union is 18 distinct documents:

§ 102 verdict on the Cited By list: no anticipation possible. Under § 102(a)/(b) a reference must predate the applicant's invention or the filing date (here, on or before 1912-01-18). All 18 are 1945–1996 filings. They are, in patent-analysis terms, forward-citation/thicket evidence, not prior art.

Source: https://patents.google.com/patent/US1025759A/en (Cited By 16/17/18 tables)

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2. The "Similar Documents" list — 25 documents, of which 12 pre-date the filing date

These are Google's algorithmic similarity hits, not citations. Google never represents them as examiner or applicant references. I treat them as a lead set for a classification-based prior-art search, and I apply § 102 only to the 12 that pre-date 1912-01-18.

2A. Pre-filing candidates — could be § 102 art if their disclosures read on the claims

Note the discipline the claims impose. Both claims 1 and 2 are combination claims requiring (i) a driven tubular piling of abutting heavy pipe sections, (ii) an internal sleeve telescoping into both sections, (iii) outward-turned set-screws biting the pipe interior (claim 1; and one end only in claim 2), and (iv) a smooth exterior with no change of diameter at the joints. Claim 2 additionally requires a portion divided into resilient sections hugging the opposite pipe end. A reference must disclose all of this to anticipate a given claim — a high bar, since (i) and (iv) are pile-driving-specific.

§ 102 verdict on 2A: None of these is a citation of record, and on the verified full text (US 590,811) there is no anticipation of claim 1 or claim 2. The remaining eleven are unverified candidates — I could not retrieve their specifications within this search, so I will not assert that they anticipate or do not anticipate. Stating otherwise would be fabrication.

2B. Post-filing documents in the same list — legally incapable of anticipating

These all post-date the 1912-01-18 filing and therefore cannot be § 102(a)/(b) art (nor § 102(e)-type art, since the modern § 102(e) "secret prior art" concept did not exist under R.S. § 4886, and none of these shares an earlier filing date with the '759 application):

US 1,021,264 A "Pipe-coupling" (1912-03-26) · US 1,036,222 A "Joint for oars or the like" (1912-08-20) · US 1,050,116 A "Rope-coupling" (1913-01-14) · US 1,058,482 A "Shaft-coupling" (1913-04-08) · US 1,082,993 A "Pipe-coupling" (1913-12-30) · US 1,121,076 A "Automatic-lock railway-spike" (1914-12-15) · US 1,309,780 A (1919-07-15) · US 1,344,914 A "Pipe-coupling" (1920-06-29) · US 1,450,475 A "Oar sleeve and collar" (1923-04-03) · US 1,482,772 A "Concrete-pipe joint" (1924-02-05) · US 1,505,553 A "Clasp" (1924-08-19) · US 1,507,138 A "Pipe union" (1924-09-02) · US 1,794,817 A "Conductor hook" (1931-03-03).

Source: https://patents.google.com/patent/US1025759A/en (Similar Documents table)

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3. One document to rule out explicitly: the same-day companion patent

US 1,051,427 A — Frank McCluskey, "Joint for tubular piling," Ser. No. 671,803, filed the same day (1912-01-18), granted 1913-01-28, disclosing a spring sleeve with staggered resilient projections and hard cutting points (per the prior litigation section). Because it is (a) by the same inventor and (b) filed on the identical day, it is not prior art under § 102 against US 1,025,759 — it is a family/prosecution relative, not a reference.

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4. Important methodology caveats

1. "Patent citation" is being read correctly here. For USPTO/Google data, a patent's Citations section (backward) = prior art considered; Cited By (forward) = later art citing it. The task's phrase "each patent citation for 1025759" maps to the Citations section, which for this patent is empty. If the intent was the Cited By list, I have supplied it above in full — but no member of it can anticipate.
2. The 1912 examiner's references are, as far as I can determine, not in the digitized record. Pre-1952 patents were printed without a "References Cited" block, and the application file wrapper for a 1912 case is almost certainly not digitized. I therefore cannot rule out that the 1912 examiner cited references not now visible; I simply have no data.
3. I did not search USPTO PatentCenter directly (nor a certified IFW), consistent with the earlier sections. My sources are Google Patents' mirror of USPTO data and the USPTO printed PDF: https://patentimages.storage.googleapis.com/e6/90/14/c7dc6102092ed2/US1025759.pdf
4. Four of the twelve pre-1912 candidates have defective/OCR titles ("reynolds"; "Eleazee kempshall"; "William g") and seven more were not retrieved; I flag them as unverified rather than characterize their disclosures.
5. Statutory anachronism note: the '759 patent was examined under R.S. § 4886 (pre-1952), which had a single novelty provision, not the § 102(a)–(g) subdivisions. Applying "§ 102(a)/(b)" to a 1912 filing is a modern mapping I have used because the task requests it; the substantive test applied in 1912 was whether the invention was known/used or patented/described in print before the applicant's invention.
6. Date inconsistency across sources: this task states the current date as April 26, 2026, while the session/system date is 2026-09-30 and the fetched Google Patents snapshot is timestamped 2026-09-30. Nothing in the art analysis turns on this, but the record should not be treated as a single-date snapshot.

If you want a genuine § 102 search (as opposed to a citation audit), the productive route is a classification search — CPC F16L 37/24, F16L 37/244, F16L 37/252 (bayonet/axial-insert couplings), USPC 285 (pipe joints) — and, for the pile-driving aspect, E02D 5/24 / E02D 5/28 (driven tubular piles), coupled with pre-1912 date limits. I can run that if you authorize it.

I'll ground this analysis by pulling the actual disclosures of the references listed in the "Prior Art" / Similar Documents and Cited By sections, rather than relying on titles alone.

Useful grounding. Let me pull disclosures for the remaining "Similar Documents" references and the same-inventor companion patent.

Editorial note on dates and scope

The task header says "Current Date: April 26, 2026"; the system date and the Google Patents fetch stamp are 2026-09-30. I flag the inconsistency but it does not affect the analysis — US 1,025,759 expired May 7, 1929 either way.

A second, substantive scope point: I was able to verify the disclosures of only four of the references in this page's prior-art/similar-document lists before I was cut off from further searching. Everything below distinguishes verified from unverified references, and I do not attribute technical content to a reference I did not actually open. Where I could not verify, I say so rather than filling the gap.

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1. The legal framework problem (read this first)

US 1,025,759 issued May 7, 1912. The statute that governs obviousness today — 35 U.S.C. § 103 — did not exist until the Patent Act of 1952. In 1912 the operative test was the judge-made requirement of "invention" (patentable novelty) applied under R.S. § 4886 and the "aggregation vs. combination" doctrine. Any modern § 103 analysis of this patent is therefore retroactive — the methodology of Graham v. John Deere (383 U.S. 1 (1966)) and KSR Int'l Co. v. Teleflex Inc. (550 U.S. 398 (2007)) is being applied to a document drafted under a different substantive standard. That is standard practice for post-1952 invalidity questions about pre-1952 claims, but it matters here because the 1912 doctrine is, if anything, more hostile to this patent than § 103 is: a mere aggregation of old elements producing no new cooperative result was held unpatentable without any need for a motivation-to-combine showing.

I analyze under § 103 as instructed, but note in § 9 below that the aggregation doctrine is the sharper weapon.

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2. What is actually in "the Prior Art section of this page"

The Google Patents "Prior Art" block contains three things, and only one of them is a reference list:

The critical date is January 18, 1912 (filing; no earlier priority claim). Sorting the Similar Documents list:

Potentially § 102/§ 103-eligible (published before 1912-01-18):

Not prior art by date (post-date the 1912-01-18 filing on their face): US1021264 (1912-03-26), US1036222 (1912-08-20), US1050116 (1913-01-14), US1051427 (1913-01-28 — same inventor, companion), US1082993 (1913-12-30), US1121076 (1914), US1309780 (1919), US1344914 (1920), US1450475 (1923), US1482772 (1924), US1505553 (1924), US1507138 (1924).

Two caveats on that second table: (i) a publication date after January 1912 does not by itself disqualify a U.S. patent as prior art if its own filing date precedes the critical date — but Google's list gives me no filing dates for US1021264, US1036222, US1050116, US1482772, or US1505553, so I decline to classify them either way; this is the single largest gap in the analysis; (ii) US1051427 is the same inventor's same-day companion application (per the previously generated Litigation section) and is excluded as prior art on any theory — same inventive entity.

Bottom line on the record: the usable § 103 art set is 12 pre-1912 references, of which I could verify 3 (one of which, Laux, is irrelevant).

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3. Person having ordinary skill in the art (PHOSITA)

Circa 1912: a mechanical/civil engineer or foundation contractor with several years' experience in pipe couplings and pile-driving practice, familiar with internal and external couplings, threaded fasteners, set screws, malleable-iron castings, and the recognized handling problem that external couplings bulge the pile profile. That skill level matters because it is high enough to make the substitution of one well-known pipe-joint retention mechanism for another a routine design choice.

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4. Claim-by-claim element mapping

Claim 1

Claim 2

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5. Combination analysis — Claim 1

Combination A (the strongest): Storrow US590811 + set-screw art

Proposed combination: Storrow's internal, double-ended, pipe-interior-engaging thimble, modified by anchoring one telescoping portion to its pipe with radially outward-pointing set-screws.

Motivation, tied to the references themselves and to the field:

1. Storrow expressly leaves the securement mode open. US590811 states the thimble is "driven into or otherwise inserted" and that "the thimble may be expanded or otherwise secured in place." A reference that tells the artisan the securing means is a matter of choice is a textbook KSR "explicit design incentive."
2. The known problem of pile driving supplies the reason to substitute a positive anchor for a friction fit. The patent itself identifies the problem ("securely joining successive sections of pipe in tubular piling, driven wells and the like"). A friction- or expansion-held internal sleeve driven repeatedly into soil is subject to axial migration under impact; a threaded anchor is the ordinary remedy.
3. Direction "outward" is dictated by function, not invention. A set screw threaded through an internal sleeve must have its point facing the pipe wall to engage anything; the only other direction (inward) engages nothing. Under KSR, "a court must ask whether the improvement is more than the predictable use of prior art elements according to their established functions." Similarly, the polygonal head being placed inside the sleeve (unclaimed, but disclosed) is dictated by the claimed flush exterior: an external head would destroy element (e).
4. Asymmetric securement (screws on one end only) is the predictable expedient once one end is anchored — the other end need only locate the sleeve during stabbing, and Storrow already shows a purely telescoping relationship.

Assessment — Claim 1: likely obvious, provided the challenger supplies a pre-1912 reference or general-knowledge evidence showing a threaded set screw turned outward into a surrounding tubular member. From this page's lists, the candidates I could not verify are US396677 ("Device for fastening conductors," 1889 — the title is suggestive of set-screw art) and US599267/US683482 (pipe/hose couplings, 1898/1901). The patent's own USPC cross-reference Y10T403/7041 — "Interfitted members including set screw" confirms that "member inside member, held by a set screw" was a recognized, indexed art field by the time the classification was built. I could not confirm a specific reference, so my confidence is moderate, not high.

Combination B: Storrow + Guy US764943 (incomplete)

Guy is a genuine support reference for two propositions: (i) that an object of internal-expansion securement is to "insure contact of the surface of the members designed to be joined," and (ii) that malleable iron is the standard material for such coupling members. Guy therefore supplies motivation and material selection but not the claimed set screw — its lug expands the rod rather than a threaded screw biting the pipe. A challenger relying on Storrow + Guy must still bridge to a screw. Combination B alone does not render claim 1 obvious.

Combination C: Guy + external-coupling art (fails on element (e))

A combination built on external couplings — e.g., the Sexton patent No. 546,906 described in 208 F. Rep. (sleeve with threaded collars whose bevels press wedge rings "upon the pipe periphery") — supplies screw-driven pressing of a member against the pipe surface, but it is an external joint. Its use would defeat claimed element (e) and would not be the combination a PHOSITA would make to solve the stated problem. This combination fails.

Beattie US1082993 — not available

Beattie's split coupling with tongues and pockets, shoulders, and "unbroken threaded interior surface," is the closest structural analogue to the split/resilient aspects of this patent, and it is the sort of reference a challenger would instinctively reach for. It post-dates the January 18, 1912 filing (published December 30, 1913) and is not prior art against US 1,025,759. Its similarity here is evidence of the crowdedness of the field, not of obviousness.

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6. Combination analysis — Claim 2

Claim 2 requires a sleeve with two different retention mechanisms: outward set-screws at one end, and a portion "divided into resilient sections … hugging the interior thereof by virtue of their resilience."

• Storrow discloses a unitary thimble, not a slitted/segmented resilient one.
• Guy discloses malleable iron, but for expansion by a spreading lug, and expressly uses the material because it is castable ("enabling me to produce the end sockets and the lug by suitable cores") — not for spring properties.
• Laux US955086 (post-anchor) is non-analogous art and would be an improper basis for combination: it is a ground anchor with a base, spur, and braces, sharing with this patent only the word "anchor"/"resistance to driving."
• Beattie (split sections) is the only page-listed reference showing a divided coupling — and it is (i) post-dating the filing and (ii) an external two-piece assembly, not a one-piece resilient sleeve.

Assessment — Claim 2: not established as obvious on this record. The specific combination of threaded bite at one end + frictional spring-grip at the other is not taught or suggested by any verified pre-1912 reference on this page, and the one reference in the field showing "divided" coupling structure cannot legally be used. The resilience requirement ("by virtue of their resilience") is also a material-property limitation — "malleable iron or other suitable metal of sufficient resilience" — which is not addressed by any verified reference. Claim 2 survives this record, though I would not call it strong; a broader search of the 1880–1912 spring-sleeve/expansion-bolt art could well change the answer.

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7. Why a PHOSITA would have been motivated (the synthesis, stated plainly)

If the challenge is made, the motivation argument should be assembled from four independent, non-hindsight sources:

1. The stated problem is in the art, independent of the patentee. US1507138 (Pierce, 1924) states its object identically — a sleeve "into which the mutually adjacent ends of two pipes are inserted … designed mainly for use in the construction of hollow piles." Pierce is post-dating and non-prior-art, but it is admissible as evidence that the constant-diameter internal-sleeve solution to the pile-joint problem was the recognized approach in this field, arrived at independently.
2. Storrow's own text makes the securement means an express design choice.
3. Guy's own text identifies "insuring contact of the surface of the members designed to be joined" as a stated object.
4. Element-by-element predictability. Every element of claim 1 is a known mechanical expedient with a known function: internal sleeve (Storrow), threaded fastener biting a tubular member (common knowledge / the "interfitted members including set screw" art), and flush profile (a result of placing the joint inside the pipe). Under 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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8. Counterarguments a patent owner would raise (and how they fare)

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9. The alternative (and probably better) attack: aggregation

For a 1912 patent, the cleaner route is the aggregation doctrine: where a claim merely juxtaposes old elements that perform their own independent, unchanged functions without producing a new cooperative result, it is unpatentable as an aggregation rather than a true combination. Applied here:

• Claim 1 = (old) sleeve + (old) set screw + (old) pipe sections. Each element performs exactly the function it always performed: the sleeve transmits/aligns load, the screw anchors, the pipe piles. The "smooth surface without change of diameter" is a result of using an internal sleeve, not a new mode of operation of the elements.
• The "sufficient thickness and strength to resist driving blows" clause is purely functional and recites a property of the pipe material, not a structure. Under both 1912 practice and modern law, a recitation of the result to be achieved adds no patentable weight.
• Claim 1 is also asymmetrically anchored — one end set-screwed, the other end merely telescoped — which raises the further question of what the "combination" contributes beyond an internal locating sleeve.

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10. Practical posture

• No litigation: consistent with the previously generated sections — the patent expired May 7, 1929 and has never been asserted.
• An IPR is theoretically available but practically pointless. The PTAB will institute on an expired patent (claims are construed under Phillips, not Phillips-for-AIA), but there is no petitioner with a stake. An ex parte reexamination is likewise available and can be filed by anyone, but for a 1912 patent with a complete printed record the "substantial new question of patentability" threshold would have to be met with art the 1912 examiner never saw — which, given the tiny and largely pre-1900 art set on this page, is possible but difficult for claim 2, and easier for claim 1 only if a pre-1912 set-screw reference is located.

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11. Verdicts

Both claims are independently vulnerable on the 1912 aggregation doctrine and on the functional character of the "sufficient thickness and strength to resist driving blows" and "without change of diameter" recitations — neither of which adds structural weight.

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12. Explicit limitations of this analysis

1. I verified the full text of only US590811 (Storrow, 1897), US764943 (Guy, 1904), US955086 (Laux, 1910), and US1507138 (Pierce, 1924, not prior art) — URLs: https://patents.google.com/patent/[US590811A](/patent/US590811A)/en · https://patentimages.storage.googleapis.com/08/3f/c0/eb70aff9123dd9/US764943.pdf · https://patents.google.com/patent/US955086 · https://patents.google.com/patent/[US1507138A](/patent/US1507138A)
2. I did not verify US237324, US396677, US481026, US512252, US533150, US599267, US683482, US786507, US857717, US1021264, US1036222, US1050116, US1051427, US1121076, US1309780, US1344914, US1450475, US1482772, US1505553. No technical content should be attributed to any of them on my authority. My searches on US1036222, US786507, and US1051427 were cut off before returning results.
3. The set-screw gap is the decisive one. Claim 1's only genuinely distinctive structural element — a pointed screw threaded through the sleeve and turned outward into the pipe wall — is not disclosed by any reference I verified. If the record cannot be closed on that element with a pre-1912 reference, claim 1's obviousness case is incomplete.
4. Filing dates of the post-January-1912 publications (US1021264, US1036222, US1050116) are unknown to me, and each could be prior art if its filing date precedes 1912-01-18. This is the largest unresolved item in the classification.
5. No assertion is made about foreign prior art, which § 102 in 1912 treated differently (a foreign patent had to be patented or described in a printed publication more than one year before filing to bar; but all foreign printed publications counted as prior art). No foreign references appear in this page's lists.
6. As the earlier sections correctly established, US 10,725,581, BE1025759B1, and FCC ASR 1025759 are different identifiers and play no role here.