US 1217503

I'll verify the literal identifier against the sources before summarizing.

Initial searches didn't surface the identifier. Let me try more targeted queries, including a possible modern-number reading and CAFC dockets.

Bottom line

US patent 1217503 is a real, literal US patent number — but it is not a modern patent. It is US 1,217,503, a seven-digit-numbered patent granted February 27, 1917 (i.e., "US 1,217,503" in contemporary comma formatting) for a roller-chain pipe grip to a lone inventor. All of the framing typical of a modern patent (assignee, formal abstract, multiple independent claims, CAFC docket) does not apply, and I will say so explicitly rather than invent it.

Note on the search itself: a literal string search for "1217503" surfaces several unrelated records that must not be conflated with the patent — an FCC Antenna Structure Registration 1217503 (a monopole tower in Mooresville, NC, owned by SBA Properties, LLC), a VA Board of Veterans' Appeals "Citation Nr: 1217503," a UK priority application GB 1217503.0 (Dyson cyclonic separator, US 9,167,943), and CAS Registry No. 1217503-60-0. None of these is the patent. I did not auto-correct or merge any identifier.

Bibliographic data (from the authoritative record)

Abstract

There is no abstract. This patent predates the abstract requirement (abstracts became standard on US patents only with the 1952 Act). The Google Patents "Definitions" block is merely OCR text drawn from the specification, not an abstract. For a synopsis, the specification states the invention "relates to roller chain pipe grips and is adapted primarily to be used in connection with mill, mine and factory pipe lines where severe usage is necessary, and especially where it is impracticable to use a rope in combination with a gripping device, as in the case of hot steam pipes." Capacity is limited only by chain length, so a single tool fits various pipe sizes.

Claims — the patent has exactly one claim

The whole claim set is a single claim (claim 1); there are no dependents and no separate independent claims. Broken into plain language:

1. Gripping jaw body with a curved toothed gripping surface — a jaw whose inner face, adjacent the pipe, is curved and toothed to bite the pipe surface (the curve need not match the pipe's roundness).
2. Tapered jaw profile — one end of the jaw body is thicker than the opposite end. Per the specification, this lets the thinner end (15) hug the pipe closely so the chain can wrap into close contact with the pipe's outer surface and achieve a good frictional hold (Fig. 5).
3. Wrist pin integral with the jaw body — the pin on which the roller turns is formed preferably as one piece with the jaw.
4. Ball-bearing roller rotatably mounted on that wrist pin — the roller is carried on the pin via ball bearings (groove 7 formed in the base of roller 4), plus cotter pin 5 and washer 6, so the chain advances freely around the roller.
5. Chain attached to the jaw, wrapping the pipe and returning over the roller — a chain whose end link (12) is pinned in a slot (8) between jaw extensions (9, 10); the chain is adapted to encircle the pipe, pass over the roller, and return against the pipe surface.
6. Lever-receiving free end — the chain's free extremity has an enlarged link (21) adapted to receive a lever (22) inserted therein; pressure on the lever instantly takes up chain slack and rotates the pipe.
7. Result / functional statement — "the whole device being designed to permit instantaneous gripping action in rotating the aforesaid pipe about its axis." This final clause is an intended-use/result limitation, not additional structure.

Not claimed but disclosed: the roller's end diameters being greater than its central portion (to seat the chain conveniently).

CAFC 2026 docket search

No result. I found no Court of Appeals for the Federal Circuit docket, decision, or appeal in 2026 (or any year) involving patent 1217503. This is expected: the patent expired February 27, 1934, over nine decades before the Federal Circuit's 1982 creation (its predecessor, the CCPA, handled appeals then), so the number cannot currently be the subject of a CAFC appeal. I could not query PACER or CAFC docket systems directly; this conclusion rests on public web and Google Patents searching.

Confidence and caveats

• High confidence on title, inventor, no assignee, filing date (1916-08-18), issue date (1917-02-27), application/serial number, single-claim structure, and expired status — all corroborated by the full patent text.
• Explicit uncertainty: I did not verify against a live USPTO Patent Center/PAIR record in this session; the bibliographic data above comes from the Google Patents record for US1217503A. Claim text is quoted from that OCR'd record, which contains minor artifacts (e.g., "mounted on the roller on the wrist pin," "gripping aw," "Fig. 15" where Fig. 1 is meant).
• Possible identifier confusion to resolve with you: if you intended a modern eight-digit patent, the nearest literal form would be US 12,175,003 — a different identifier that I could not confirm exists or find any record for, and which I have deliberately not substituted. Also note that US 1,217,503 and "1217503" are the same patent, not different ones.

If your underlying need is a validity/prior-art landscape for a chain-type pipe wrench, the Google Patents "Similar Documents" list for this record is a useful starting point (e.g., US 747,612 Pipe and tubing tongs; US 1,413,306 Flexible chain wrench; US 1,792,401 Chain tongs; US 3,205,735 Chain wrench).

I'll search the litigation databases for this specific patent number.

The initial searches returned only unrelated documents (a Chinese patent CN-1217503-A, a UK application GB 1217503.0, etc.). Let me search litigation-specific sources directly.

Let me try the dedicated litigation portals directly for this number.

Litigation Search Report — US Patent No. 1,217,503

Patent identified: US 1,217,503 A, "Roller-Chain Pipe-Grip," inventor James J. Rhinelander (Pittsburgh, PA). Application No. 115,627, filed August 18, 1916; granted February 27, 1917; anticipated expiration February 27, 1934. Legal status: Expired - Lifetime.

Result: No litigation found

I found no litigation (no district court action, no CAFC appeal, no PTAB proceeding, no ITC investigation) involving US Patent No. 1,217,503.

What I searched and what I found

I ran targeted queries against the litigation-focused sources you specified (Unified Patents litigation portal, CourtListener, Docket Alarm, and general PACER/CAFC-oriented queries for the exact number). Every query returned only unrelated hits containing the digit string "1217503", none of which relates to the Rhinelander patent:

Why no litigation is expected

Beyond the empty search results, there are structural reasons the answer is almost certainly "none":

1. Age and term. The patent issued in 1917 and its statutory term expired February 27, 1934 — roughly 92 years ago. Any cause of action for infringement would have been time-barred long before modern electronic docketing systems (PACER, CourtListener, Docket Alarm, Unified Patents) existed, so any suit would fall outside what these databases index.
2. PTAB/IPR is impossible. Inter partes review and other AIA post-grant proceedings could not have applied to a patent that expired in 1934.
3. Pre-database litigation. If any infringement suit was ever filed during the 1917–1934 window, the records would exist only in physical archives (N.D. Ill., W.D. Pa., etc.) and are not captured in the sources you directed me to search.

Caveat on confidence

I can state with high confidence that no litigation is recorded in the modern patent-litigation databases for US 1,217,503. I cannot rule out — and my searches would not surface — an unindexed, pre-1934 court action litigated on paper before electronic docketing. If you need that historical confirmation, the appropriate sources would be the USPTO's own historical records or the National Archives, not the litigation portals.

Bottom line: Based on the available search results, there is no known litigation involving US Patent 1,217,503. I will not manufacture plaintiff/defendant/case-number data for a suit that the record does not support.

I'll verify the structured "no proceedings" default against public sources before writing the report.

Proceedings overview

Total AIA trial proceedings on file for US 1,217,503: 0. Breakdown: 0 active, 0 claims invalidated, 0 claims sustained, 0 settled, 0 institution-denied — the structured PTAB proceedings list (USPTO Open Data Portal) contains no IPR, PGR, or CBM record for this patent, and no Federal Circuit appeal of any PTAB decision exists to report. The defensive posture this gives a defendant is not "hardened patent" and not "canceled claim" — it is something more basic: claim 1 of US 1,217,503 has never been tested in any AIA forum, and it cannot be asserted against you in the first place, because the patent expired on 1934-02-27. The absence of PTAB activity here is not a signal of a quietly respected patent; it is a signal that the patent has been dead for roughly nine decades.

No proceedings to itemize

Every requested bucket is empty. Stated explicitly so the record is unambiguous:

I could not populate Proceeding Number, Petitioner, Patent Owner, Judge panel, Petition grounds, Institution decision, FWD, Settlement, or Appeal fields, because there is no proceeding. I will not construct those fields for a docket that does not exist.

Why the empty list is categorically correct, not just an indexing gap

Beyond the ODP result, three statutory facts make AIA trial activity impossible as a matter of law for this patent:

1. PGR is unavailable by statute. Post-grant review under 35 U.S.C. § 321 applies only to patents with an effective filing date on or after 2013-03-16. US 1,217,503 was filed 1916-08-18 (Application No. 115,627) with a 1917 grant — a PGR petition would be jurisdictionally barred at the threshold.
2. CBM is unavailable by subject matter and by sunset. Covered business method review was limited to patents claiming a "financial product or service," and the program sunset on 2018-09-16. A 1917 roller-chain pipe grip (USPC/CPC B25B 13/52, chain or strap wrenches) is a hand tool, not a financial-services claim, and the window closed regardless.
3. IPR is theoretically available but practically void. Inter partes review under § 311 is not filing-date-limited, but an IPR on a patent whose statutory term ran out on 1934-02-27 secures a petitioner nothing: § 311(b) review of an expired patent cannot yield enforceable claims, and any past-infringement theory is time-barred under the § 286 six-year damages lookback. No rational petitioner files.

This also dovetails with the prior section of this analysis: no district court, ITC, or CAFC litigation involving US 1,217,503 exists in any modern database, so there is no litigation-triggered IPR to find either. No parallel-track contradiction to flag — the litigation section and this section are consistent.

Search confirmation

Queries run against PTAB-facing sources returned only unrelated hits containing the same digit string — a Chinese publication (CN 1217503 A), a UK priority application (GB 1217503.0, cited in US 9,167,943 B2), a VA Board of Veterans' Appeals citation numbered 1217503, and historical chain-grip cases involving different patents (e.g., Perry v. Weed Chain Tire Grip Co., 6th Cir. 1914, which adjudicated Parsons patent No. 723,299 — not Rhinelander's patent). None is an AIA trial on US 1,217,503.

Strategic summary

Claim status. US 1,217,503 as published contains a single claim — claim 1 — a gripping jaw with a curved toothed surface, a thicker end and a thinner end, an integral wrist pin, a ball-bearing roller, and a chain adapted to encircle a pipe, pass over the roller, and return against the pipe surface, with a lever-receiving free end. That claim is UNTESTED: never challenged in an IPR, PGR, CBM, or reissue/ex parte reexamination proceeding that appears in the modern record. There are no CANCELED claims and no SUSTAINED claims to list, because there has been no adjudication to cancel or sustain anything. Do not read "no adverse decisions" as "validity confirmed" — it means no one bothered.

Estoppel landscape. Because no AIA trial was ever instituted, § 315(e)(2) estoppel is empty. There is no petitioner, no privity chain, and no ground that a prior challenger raised or reasonably could have raised. A defendant facing a demand today would carry no estoppel baggage — but would also have no FWD to point to. The controlling defenses are not estoppel-based at all; they are temporal: the patent's term expired 1934-02-27 (the ODP lists anticipated expiration on 1934-02-27; legal status "Expired - Lifetime"), so liability exposure is zero for any conduct after that date and effectively zero for anything earlier via § 286.

Pattern signals. No repeat petitioner (there are no petitioners). No PTAB-appeal aggressiveness by the patent owner (no FWDs to appeal). No defensive aggregator — Unified Patents is not in this chain; it surfaced in searches only because its database indexes the coincidentally-numbered Chinese publication CN 1217503 A. No continuation family, no reissue, no certificates of correction appearing in the ODP family data (Family ID 3285386 lists a single member: US 115,627 → US 1,217,503 A).

Recommended next steps

• If you are a defendant: stop here. The correct response to any assertion of US 1,217,503 is not an IPR petition but a citation to the patent's own front page: filing 1916-08-18, issuance 1917-02-27, expiration 1934-02-27. Confirm the record at US 1,217,503 on Google Patents and the USPTO's Patent Center (application 115,627). There is no FWD to quote, because none exists.
• Do not file an AIA petition. It is a waste of fees: no PGR (filing date predates 2013-03-16), no CBM (non-financial subject matter; program sunset 2018-09-16), and an IPR on a patent expired since 1934-02-27 cannot produce a commercially meaningful outcome.
• If you are an academic or historian of the art: the useful adjacent record is the chain-wrench prior-art cluster, e.g., US 1,413,306 A ("Flexible chain wrench," 1922-04-18), US 1,792,401 A ("Chain tongs," 1931-02-10), US 1,013,232 A, and US 810,738 A — all listed in the ODP "Similar Documents" set for this patent.
• If you were expecting PTAB activity and found none: the absence is itself the answer — patents that are economically asserted for decades eventually attract petitions; this one's assertion window closed in 1934. Verify independently at the PTAB Center / E2E and CourtListener if you need a belt-and-suspenders record check for a client memo.

Confidence note: I state with high confidence that zero AIA trial proceedings exist for US 1,217,503, supported by both the structured ODP block and the categorical statutory analysis above. The one thing I cannot do is rule out a non-electronic historical record (e.g., a 1917–1934 interference or court challenge to the original claim), which would live in National Archives holdings rather than any PTAB or litigation database — but that would not be an AIA trial in any event.

I'll research the assignment record for this patent, starting with the official USPTO sources and cross-references.

Key finding on database coverage — let me verify the Assignment Center's date coverage and check for any Rhinelander corporate ties.

Inventors

Notes on pattern:

• Sole inventor. The grant is headed simply "JAMES J. RHINELANDER, OF PITTSBURGH, PENNSYLVANIA" — there is no "assignor to" recital, which is the standard signal that a patent issued unassigned to the inventor personally. Google Patents' bibliographic record likewise lists Original Assignee = "Individual" and Current Assignee = "Individual."
• Rhinelander was a repeat inventor in the pipe-tool art, not a one-off filer. He is the named inventor of US 722,144, "Pipe-Wrench" (filed 1902‑09‑20, issued 1903‑03‑03), where he is recorded as residing at Butler, Pennsylvania — i.e., he moved Butler → Pittsburgh between 1902 and 1916. Same class of subject matter (chain/flexible-member engagement of a pipe), suggesting a career toolmaker or pipe-trade mechanic rather than an employee of a large corporate R&D shop.
• There is no inventor-departure signal to evaluate: with one inventor and no corporate co-owner, the "all inventors left the assignee within 12 months" fire-sale precursor common in modern NPE analysis is structurally inapplicable.

Original assignee

None. The patent issued February 27, 1917 to James J. Rhinelander as an individual, with no assignee named on the face of the grant. Google Patents records "Original Assignee: Individual" and "Current Assignee: Individual."

Consequently:

• Product embodying the claims: Cannot be confirmed from patent records. The specification describes the device as adapted for "mill, mine and factory pipe lines," hot steam pipes, and confined spaces — an industrial-utility tool rather than a consumer article.
• Primary line of business: Not applicable; the original owner is a natural person, not an entity.
• Current status: Not applicable. Rhinelander is a 19th/20th-century individual; I found no corporate successor, merger, or dissolution record, and I will not infer one.

Assignment timeline

The USPTO Assignment Center has no records for this patent, and none should be expected.

• I could not execute a live query against assignmentcenter.uspto.gov / assignment.uspto.gov in this session (no direct API access); however, the authoritative coverage limits of that database are well documented. Per the USPTO's own Assignment Database webinar materials: "This searchable database contains all recorded Patent Assignment information back to August 1980." Caltech's library guide states the same: the database "tracks patent changes back to August 1980." (See https://www.uspto.gov/sites/default/files/documents/Assignment%20Database%20Webinar_20150120.pdf and https://library.caltech.edu/c.php?g=[512660](/patent/512660)&p=[3502928](/patent/3502928).)
• US 1,217,503's statutory term expired February 27, 1934. Any assignment of it would necessarily have been executed and recorded between 1917 and 1934 — 46+ years before the Assignment Center's coverage window opens. It is therefore invisible to that system, and I cannot produce reel/frame numbers, correspondents, or conveyance types.
• Google Patents' legal-events timeline for this patent (the authoritative text supplied above) lists only filing (1916‑08‑18), priority, grant (1917‑02‑27), publication, anticipated expiration (1934‑02‑27), and the "Expired ‑ Lifetime" status. No assignment, security agreement, or change-of-name events appear.

Finding: The record contains no recorded post-issuance assignment. The patent appears to have remained with the inventor/original owner throughout its 17-year term, and it lapsed into the public domain in 1934. Any 1917–1934 transfer, if one occurred, would exist only in unindexed paper records at the USPTO's Assignments Recordation Branch or the National Archives — I have no evidence that such a transfer exists and will not fabricate one.

Timeline diagram

timeline
    title Ownership of US 1217503
    1902 : Rhinelander files earlier pipe wrench patent
    1916 : Application filed 18 August by Rhinelander
    1917 : Patent issued 27 February to Rhinelander alone
    1934 : Patent term expires 27 February
         : No recorded assignment in USPTO system

NPE / troll-pattern signals

Framing caveat: this patent predates the modern patent-assertion industry by roughly seven decades. Every signal below is assessed against the record, but signals 2–5 and 7 are functionally anachronistic for a 1917 grant that expired in 1934.

1. Shell-entity transfer — not present. No assignee of any kind is recorded. There is no "IP / Holdings / Ventures" transferee, no registered-agent address, and no post-issuance conveyance to examine.
2. Known asserter in the chain — not present. None of Acacia, Marathon, Intellectual Ventures, IPNav, Wi‑LAN, Mosaid/Conversant, Vringo, Pendrell, Round Rock, etc. could appear: all post-date this patent's 1934 expiration, and no assignee at all is recorded.
3. Repeat correspondent across the chain — not present. No recorded assignment means no recording correspondent exists to recur. There is no attorney of record for a conveyance because there is no recorded conveyance. (The patent's own prosecution attorney, if any, is not named in the supplied text.)
4. Cascading transfers — not present. Zero recorded links; no chained LLCs, no common principals, no shared correspondent addresses.
5. Pre-litigation transfer — not present. The prior litigation review for this patent found no infringement suit in any indexed federal docket. With no suit and no recorded assignment, there is no transfer-to-set-venue pattern. Pre‑1934 suits would not be captured by modern dockets, but as a documented matter there is no signal.
6. Bankruptcy fire-sale — not present. No corporate owner ever existed, so no Chapter 7/11 proceeding could have sold this patent.
7. Privateering — not present. Requires an operating company transferring to an NPE for assertion against competitors; neither element exists.
8. Defensive aggregator (anti-NPE) — not present. The chain does not terminate at RPX, AST, LOT, Unified Patents, or OIN. The patent simply expired.

Verdict

Insufficient data (no records — in fact, not even the original assignment).

The determining facts are structural rather than evidentiary: US 1,217,503 issued unassigned to James J. Rhinelander as an individual on 1917‑02‑27, showed no assignee on its face, and expired 1934‑02‑27. The USPTO Assignment Center's records begin August 1980, so the entire 1917–1934 window in which any assignment could have been recorded falls outside the searchable database, and Google Patents' legal-events record for this patent accordingly shows only filing, grant, and expiration — no conveyance of any type. There is no basis to characterize this as an NPE chain, an operating-company assertion, or a defensive aggregation; the honest answer is that the ownership chain is unreconstructed beyond the original individual inventor-owner.

Verify at: https://assignment.uspto.gov/patent/index.html (patent-number search "1217503") — expect zero results, consistent with the pre-1980 coverage gap described above. For any pre-1934 paper record, the appropriate sources are the USPTO Assignments Recordation Branch and the National Archives, not the Assignment Center.

Cross-reference note: The prior litigation section of this analysis reached the same conclusion from the docket side (no district court, CAFC, PTAB, or ITC proceeding involving US 1,217,503). The two sections are consistent: no litigation, no recorded assignment, individual inventor-owner, expired 1934.

I'll verify the record directly and look for any citation data before analyzing prior art.

Let me check for a "Cited By" list and the inventor's earlier work, plus roller-based chain wrench art.

Prior-Art Analysis — US Patent No. 1,217,503

Interpreted literally: the identifier "1217503" as a US patent number is US 1,217,503 (comma = thousands separator only — same number, not a different one). It is not CN 1217503 A (IBM "local printing," 1999), not GB 1217503.0 (Dyson cyclonic separator priority application), and not US Trademark Reg. 1217503. Those are separate identifiers and I have not merged them into this analysis.

1. Two threshold findings that shape the whole answer

Finding A — the patent has no citation record at all. US 1,217,503 issued February 27, 1917. USPTO practice of printing an applicant/examiner "References Cited" list on the face of a patent did not begin until roughly 1947. Consequently, the record for this patent contains no "Patent Citations" list, no "References Cited" section, and no cited-by listing — only a machine-generated "Similar Documents" list. I verified this against the authoritative Google Patents record (the same record supplied to me, which shows a "Similar Documents" block but no citation block): https://patents.google.com/patent/US1217503/en

Therefore the literal instruction "look at each patent citation for 1217503" has an empty answer: there are zero patent citations of record. What follows is (i) the closest available substitute — the pre-filing-date art in the record's computed similarity list plus independently located contemporaneous art — and (ii) an element-by-element §102 analysis against the single claim.

Finding B — search-method caveat. I was not able to complete a direct query of USPTO Patent Public Search / Patent Center within this session's tool budget. Everything below is sourced from the Google Patents record and DATAMP, with the provenance flagged per item. I state this rather than imply a USPTO-direct search I did not finish.

(Minor housekeeping flag: this task's header says "Current Date: April 26, 2026," while the session header and the record's fetch timestamp say 2026‑09‑27. No substantive effect, but the prior sections in this file were prepared under the later date — flagging the inconsistency as instructed.)

2. Applicable §102 framework (important — the modern statute does not govern)

The application was filed August 18, 1916, so the governing law is the pre-1932 version of R.S. §4886 / 35 U.S.C. §102, under which:

• The statutory bar was TWO years, not one (reduced to one year by the 1932 amendment). A printed publication or patent before August 18, 1914 is a statutory bar (§102(b)-type); art between Aug. 18, 1914 and Aug. 18, 1916 is §102(a)-type art (prior invention / prior patent or publication), not a bar.
• There was no express §102(e) provision in 1916. Whether a US patent could be treated as a reference as of its filing date (later codified as §102(e)) rested on the judge-made "Milburn" doctrine. I flag this because one reference below (US 1,195,558) is dated only four days after the filing date and would need that doctrine to be even arguable art.
• Practically: the patent expired February 27, 1934 (anticipated expiration per the record). Every claim is long dead, so this is a historical/validity-style exercise, not a live risk.

3. Pre-filing-date art located (potential §102 art)

3a. From the record's own "Similar Documents" list — all dated before 1916‑08‑18

3b. Independently located contemporaneous chain-pipe-wrench art (all pre-filing, all relevant field)

4. Post-filing-date documents in the same "Similar Documents" list (NOT §102 art)

These are useful only for field context and for showing the later arc of the art; they post-date the 1916 filing and cannot anticipate under §102(a) or (b):

US 1,413,306 (Flexible chain wrench, 1922‑04‑18) · US 1,400,451 (Wrench, 1921‑12‑13) · US 1,513,164 (Jar wrench, 1924‑10‑28) · US 1,792,401 (Chain tongs, 1931‑02‑10) · US 2,766,648 (1956‑10‑16) · US 2,771,802 (Screw cap wrench with flexible strap, 1956‑11‑27) · US 2,995,965 (Flexible strap wrenches, 1961‑08‑15) · US 3,205,735 (Chain wrench, 1965‑09‑14) · US 3,969,963 (Adjustable pipe wrench, 1976‑07‑20) · US 7,546,784 (Pliers having greater holding force, 2009‑06‑16).

Related later chain-wrench art surfaced during searching and useful for completeness: US 2,944,452 (Vose, Chain link pipe wrench with plural handle-saw surfaces, filed 1959‑04‑10), whose own cited references are US 354,197 (1886), US 514,721 (1894), US 968,335 (1910), US 1,410,993 (1922), US 1,470,161 (1923), US 2,726,564 (1955) and GB 15,647 (1906); US 3,302,497 and US 3,309,xxx-family chain pipe wrenches; US 3,739,663 (Chain actuated pipe tongs); DE 354,139 C (Kettenrohrzange — German chain pipe wrench with gripping jaw B, chain C, and recesses f/g in the working faces; date not verified, and the 354,xxx German number range suggests it likely post-dates 1916, so I do not treat it as §102 art).

5. Element-by-element §102 anticipation analysis against the sole claim

Claim 1 has seven elements. For §102 anticipation, one single reference must disclose every element (no picking and choosing). Every reference above fails on the same cluster of elements.

Conclusion on §102

No reference located anticipates claim 1 under 35 U.S.C. §102. The claim is a single composite claim, and every candidate reference lacks at least elements (b), (c) and (d) — most importantly the ball-bearing roller rotatably mounted on a wrist pin integral with the jaw body, and the jaw body whose one end is thicker than the other.

If forced to name the most relevant single reference for the file, it is US 966,182 (Erickson, granted Aug. 2, 1910) — it discloses the operative concept of a toothed jaw plus a chain encircling the pipe that is tensioned by a lever and self-tightens on rotation, in the same B25B chain/strap-wrench field — followed by US 698,780 / US 773,773 (Amborn) and US 722,144 (Rhinelander's own earlier patent). None of these was "cited" in the legal sense, because this 1917 patent has no citation list.

6. Obviousness note (beyond the strict §102 ask, flagged as such)

The task asked only about §102, but the practical vulnerability of this claim would lie in §103: the jaw-plus-chain-plus-lever combination was crowded and old (items 16–28 above), and antifriction roller bearings were ubiquitous by 1916. The non-trivial structural contributions — (i) the freely-rotating ball-bearing idler roller over which the chain advances to take up slack instantly, and (ii) the thickness-tapered jaw body enabling the thin end to hug the pipe — are the two places a challenger would have to attack. A combination of, e.g., Erickson '182 with any contemporaneous roller/antifriction-bearing teaching could be argued. I note this as analysis, not as an assertion of an actual rejection of record (no file-wrapper rejection data was available to me).

7. Confidence and explicit limitations

• High confidence: US 1,217,503 has no citation list of record; the "Similar Documents" list dates and numbers as tabulated; the element-by-element conclusion that no located reference anticipates claim 1; the bibliographic data of US 489,048, US 698,780, US 722,144, US 773,773, US 966,182, US 822,017 and CA 98,249 (dates as given in the sources above).
• Explicit uncertainty: (1) I did not complete a direct USPTO Patent Public Search / Patent Center query in this session — the tool budget was exhausted, and my sources are Google Patents and DATAMP, so a USPTO-direct confirmation remains open; (2) US 653,943's inventor, title and grant date are unverified (partial OCR only) and that row should not be relied on; (3) DE 354,139 C's date is unverified and I have deliberately excluded it from the §102 analysis; (4) the nature of US 1,195,558 (1916‑08‑22) is unverified beyond the truncated inventor name "David W."
• Deliberately not invented: I have not supplied case names, rejection grounds, examiner citations, or class/subclass art rejections that the record does not contain. If genuine file-wrapper citations for Serial No. 115,627 exist at all, they would be in the National Archives / USPTO historical records (paper), not in any electronic citation field — precisely because the 1917 printing practice had no such field.

I'll pull the prior-art references listed in this record (the Google Patents "Similar Documents" set) to evaluate what they actually disclose, focusing on those that predate the Aug. 18, 1916 filing date.

Now let me pull the remaining pre-1916 references from the Similar Documents list, plus search for the specific structural features (roller/sheave + ball bearings) in chain-wrench art.

Framework note before the analysis

Two threshold points I have to state explicitly, because they change how the § 103 analysis must be run on this record:

1. This is a 1916 case, so § 103 is being applied anachronistically. US 1,217,503 was filed 1916-08-18 and granted 1917-02-27. At that time patentability was judged under the "invention" requirement of R.S. § 4886 (Hotchkiss v. Greenwood, 52 U.S. 248 (1850)) — the doctrine later crystallized as the "flash of creative genius" test (Cuno Eng'g v. Automatic Devices, 314 U.S. 84 (1941)). 35 U.S.C. § 103 did not exist until the 1952 Act. I run the Graham v. John Deere, 383 U.S. 1 (1966), / KSR Int'l v. Teleflex, 550 U.S. 398 (2007), analysis below as requested, but the conclusion has to be read as "would this combination have been obvious," not as a statement of 1916 Office practice.

2. Most of the "Similar Documents" set cannot legally be § 102/§ 103 prior art here. A reference must qualify under § 102 against the 1916-08-18 filing date. The record's own list mixes in post-1916 patents that I am excluding from any combination below, literally as numbered (no auto-correction):

Those may be cited as evidence of what the art later did, but a § 103 combination built on them would be legally void. The usable set is the pre-1916 portion.

Level of ordinary skill

A mechanic/machinist or tool-forging artisan circa 1910–1916, experienced in hand tools for pipe fitting, oil-field tongs, and chain-and-lever gripping devices. Not a ball-bearing engineer per se, but someone working in a period when antifriction ball bearings were ubiquitous in bicycle, machinery, and vehicle practice and routinely specified for any journal that had to turn freely under load.

Element-by-element mapping of the single claim

The patent has exactly one claim (confirmed in the earlier section of this analysis). Stripped to its structural limitations:

The preamble-plus-chain-wrap (A, B, F-without-roller, G) is squarely old. The only genuinely contested limitation is E (ball-bearing roller), with C (tapered jaw) a secondary weak point.

Combination 1 (strongest): Hyle + Helm + ordinary skill

US 1,016,997 (Hyle, 1912-02-13) — gripping jaw bearing on one part of the pipe, chain wrapped around the opposite part, chain pivotally connected at one end to the jaw and at its other end to the hub of the handle, with the chain "wound around the periphery of the hub … upon turning the handle in the direction for tightening." This discloses A, B, F (chain passing over a fixed hub carried by the tool and returning against the pipe), G (handle as the lever/tightening means), and a jaw with a relatively higher front and lower rear (C).

US 1,031,261 (Helm, 1912-07-02) — expressly discloses "rollers 12 and 20 [which] provide antifriction four-point supports" in a pipe wrench, i.e., antifriction rollers are a known and accepted element in this exact art for reducing resistance when a pipe must be turned.

Combination: substitute Helm's antifriction roller for Hyle's fixed hub at the point where the chain reverses direction, and mount it on a pin integral with the jaw body (D) using standard ball bearings (E).

Motivation, stated in the art itself:

• Hyle's own stated objects — "the connection between the chain and the handle is strengthened and the cost of producing the handle is materially reduced" — establish that the chain-reversal journal was a known design focal point.
• Rhinelander's own specification supplies the motivation: the ball bearings "enable the roller to rotate freely on the wrist pin, thus enabling the chain to advance around the roller," taking up slack "instantly." That is the classic friction-reduction rationale that a skilled artisan would have recognized before filing, given Helm's rollers — and it is precisely the kind of "predictable use of prior art elements according to their established functions" that KSR holds unpatentable.
• KSR, 550 U.S. at 417: "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."

Combination 2: Jones + Hultgren + Helm

US 747,612 (Jones, 1903-12-22) supplies the curved, toothed, semicircular pipe-engaging jaw and a separable toothed die; US 733,648 (Hultgren, chain tongs, 1903-07-14) supplies the chain-plus-serrated-shoe gripping mode ("a section of chain and a serrated shoe constitute the means for engaging the pipe") with a head formed to seat on the shoe; US 1,031,261 (Helm) supplies the antifriction roller. Rationale for the combination: Jones describes the jaw as "embrace[ing] a pipe … for nearly, if not quite, one-half its peripheral circumference," with the remainder completed by a hinged member — exactly the geometry Rhinelander's jaw-plus-chain performs. Replacing the hinged second jaw with a chain running over a low-friction roller is a substitution of one known pipe-encircling member for another with predictable effect.

Combination 3: Hyle/Gealy + Helm + ball-bearing art

US 1,078,426 (Gealy, 1913-11-11) — "a chain wrench that has gripping jaws to which one end of a chain can be easily attached, the opposite end of the chain being connected to a lever supporting the gripping jaws, said lever being arranged in a manner that permits of the jaws being shifted into engagement with a pipe to clamp the chain thereon when leverage is brought to bear upon said lever" — supplies G almost verbatim (chain end connected to a lever; leverage clamps the chain). Add Helm's rollers (E) and standard ball-bearing practice.

Where the challenge is weakest, and where the patent would resist

I will not overstate the case. Two honest gaps:

1. Limitation C (one end of the jaw thicker than the other). Hyle's "front parts … relatively higher than the rear parts" is disclosed in the context of a two-piece segmented jaw, not a one-piece tapered jaw body. The mapping is arguable, not clean. Rhinelander's stated purpose — "permitting the end 15 to hug the pipe 18 closely, thereby allowing the chain 13 to obtain a close contact with the outer surface 17" — is an encapsulation-driven design expedient, which supports an obviousness argument based on the recognized function rather than on anticipation.

2. Limitation E (ball-bearing roller, specifically). In my searches of the pre-1916 record I did not find a chain wrench in which the chain runs over a grooved roller on a ball bearing. Helm's US 1,031,261 teaches antifriction rollers used to support the pipe, not to carry a chain. So the strongest available position is KSR-style predictable substitution (a roller journal at the chain-reversal point + a known low-friction bearing = obvious), plus the patentee's own admission in the specification that this was done "for the evident purpose" of letting the chain "advance freely." That is a reasonable but contestable § 103 case — an examiner or court could find the specific combination of ball-bearing spool roller in a chain-wrench head not shown, and the patent's own narrowness (one claim, no dependents) means there is no fallback claim to retreat to.

Also worth flagging for the record: the roller's actual chain-guiding geometry — "the end diameters of the roller being greater than the diameter of the central portion thereof" — is disclosed but not claimed. Under the single-claim construction used in the earlier section, one cannot rely on that limitation to rescue the claim; it is dedicated to the public.

Secondary considerations (Graham factor 4)

The specification asserts: (i) chain beats rope because rope stretches "especially in the case of hot steam pipes where moisture is encountered"; (ii) capacity "limited only by the length of the chain used," so one tool fits various pipes; (iii) compactness for transport. None of these has a nexus to the only arguably novel limitation (the ball-bearing roller) — (i) and (ii) are inherent properties of any chain wrench, and Hyle and Gealy both claim broad size adjustability. The record contains no evidence of commercial success, copying, or licensing. I found no secondary-consideration evidence of nonobviousness in the materials available to me.

Non-litigation cross-check

The earlier sections of this analysis established no district court, ITC, CAFC, IPR, PGR, or CBM activity — consistent with this section. I note only that the chain-grip art was litigated contemporaneously in Perry v. Weed Chain Tire Grip Co., 6th Cir. 1914 (adjudicating Parsons patent No. 723,299), which is evidence that the chain-grip field was crowded and actively patented going into 1916 — a fact that cuts toward obviousness (KSR's "combination of familiar elements").

Bottom line

• No single reference anticipates the sole claim — the claim is a combination, not a § 102 case.
• Under § 103, the claim is vulnerable to a three-reference combination, with the primary combination being US 1,016,997 (Hyle) + US 1,031,261 (Helm) + ordinary skill in ball bearings, and US 747,612 (Jones) as an alternative jaw source. Motivation is strongest on friction/slack-take-up, which is both the patent's own stated rationale and a standard improvement recognized in the art (Helm).
• The single hardest limitation to defeat is the ball-bearing roller of element E, because I could not locate a pre-1916 chain wrench showing a roller over which the chain travels. The obviousness case there rests on predictable substitution, not on an express teaching.
• The tapered jaw (element C) is mapped only imperfectly, to Hyle's higher-front/lower-rear jaw sections.
• I cannot opine with high confidence on US 1,077,591, US 1,180,446, US 810,738, US 785,711, US 610,450, US 426,223, US 280,793, US 218,195 or US 218,285 — these appear in the record's Similar Documents list and are all pre-1916, but my searches did not return their texts. Several of them could contain a disclosing roller or tapered jaw. They should be pulled in full before any invalidity contention is finalized.
• Confidence: high that the claim is a combination claim obvious over the chain-wrench art generally; medium on the specific roller-plus-ball-bearing limitation; high that the post-1916 references in this record's Similar Documents list (US 1,413,306, US 1,513,164, US 1,792,401, US 2,776,802, US 2,995,965, US 3,205,735, US 3,969,963, US 7546784) are legally unavailable as § 102/§ 103 art against a 1916 filing date and must not be used in any combination.

Sources consulted: https://patents.google.com/patent/US1217503/en (authoritative full text); US 747,612 (https://patents.google.com/patent/[US747612A](/patent/US747612A)/en and https://patentimages.storage.googleapis.com/e9/ff/2a/c54ffadef8fece/[US747612](/patent/US747612).pdf); US 1,016,997 (https://patentimages.storage.googleapis.com/23/d9/0a/f15ed848329f13/US1016997.pdf); US 1,031,261 (https://patentimages.storage.googleapis.com/3f/66/b7/0b92fc5dc29fb3/US1031261.pdf); US 1,055,148 (https://patentimages.storage.googleapis.com/6e/65/57/4ffdc3471ab06d/US1055148.pdf); US 1,078,426 (https://patentimages.storage.googleapis.com/40/af/6b/b5ace5bad8cfce/US1078426.pdf); US 771,915 (https://patentimages.storage.googleapis.com/f4/be/6b/cd4c19273b735f/[US771915](/patent/US771915).pdf); US 769,043 (https://patentimages.storage.googleapis.com/12/d1/f1/5e30efafb0e449/[US769043](/patent/US769043).pdf); US 733,648 (https://www.datamp.org/patents/search/displayPatent.php?number=733,648); US 818,371 (https://www.datamp.org/patents/search/advance.php?pn=[818371](/patent/818371)&id=49651&set=29).