US 5535531

I'll search for litigations, dockets, and USPTO records for US 5,535,531.

Let me run additional targeted searches for litigation/docket activity and USPTO records.

Patent Analysis: US 5,535,531 — "Shoelace Rapid Tightening Apparatus"

Searches performed: general web search for "US patent 5535531"; targeted search for litigation/docket activity ("5,535,531" + litigation/lawsuit/infringement); targeted search for CAFC/"Federal Circuit" + 5535531; search for inventor/assignee names; cross-checked Google Patents, FreePatentsOnline, Justia, uspto.report, everypatent, and Unified Patents records.

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1. Bibliographic Data (from the authoritative full text provided; corroborated by Google Patents / FPO / Justia)

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2. Abstract (as issued)

"A friction reducing shoe device for easing tightening and untightening of the shoe laces. The friction reducing device is positioned atop a tongue portion of a shoe between two opposing edges of an upper cover of a shoe atop. The device and includes a friction reducing channel formed for and receiving the portion of the shoe lace contacting an upper surface of the tongue portion which extends between the two edges. This channel separates the contact portions of the lace from frictional contact with the tongue upper surface to reduce friction therebetween during tightening and untightening of the lace."

Core technical problem: conventional shoes create high friction between laces and (a) the eyelets, (b) the opposing upper-cover edges, and (c) the tongue. Prior art (e.g., US 4,916,833 to Nwoko) addressed only the eyelets. The disclosed invention interposes a low-friction channel/medium between the lace and the tongue/edges.

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3. Plain-Language Overview of Each Independent Claim

Both claims are apparatus claims, and both close with the same distinguishing limitation: a "loop member" protruding from the device body in a direction generally opposite the bottom side.

Claim 1 — Improvement claim (Jepson-style) for a laced shoe assembly

Preamble (conventional elements treated as prior art): an upper cover surrounding the foot with an opening bounded by a first edge and an opposing second edge; pairs of spaced-apart eyelets along those edges; a tongue mounted at one end so its upper surface sits in the opening; and a lace threaded through the eyelets criss-crossed over the tongue.

The improvement (the actual novel element):

• A friction reducing device positioned between the first and second edge;
• having a bottom side contacting the tongue upper surface;
• including a first friction reducing channel that receives the lace contact portion and separates the lace from frictional contact with the tongue upper surface, reducing friction during tightening/untightening; and
• the device including a loop member protruding generally opposite the bottom side.

In plain terms: Put a grooved/sleeved low-friction piece on top of the tongue, run the criss-crossing lace segments through its channel so they no longer drag on the tongue, and give it an upstanding loop (e.g., the rings/loops 215 of the FIG. 21a embodiment, or a finger/hold tab) so the wearer can grip and pull it easily.

Claim 2 — Stand-alone laced shoe assembly claim

Preamble: an upper cover with an opening bounded by first and opposing second edges; an elongated cord (note: "cord," not "lace") laced through eyelets on opposite sides such that common contacting portions of the cord contact one another (i.e., the criss-cross segments cross over/touch each other).

The inventive body:

• A friction reducing device positioned between the first and second edge;
• having a bottom side contacting a support surface (note: claim 2 says "support surface," not "tongue upper surface" — so this claim is not expressly tied to a tongue);
• including a first friction reducing channel receiving the cord contact portion and separating the common contact portions from frictional contact with one another (i.e., it reduces lace-on-lace friction, not just lace-on-shoe friction); and
• the device body including a loop member protruding generally opposite the bottom side.

In plain terms: Same device concept, but framed to reduce lace-against-lace friction where the two cord segments overlap on top of the shoe, with the device resting on a support surface, and again featuring the protruding grip loop.

Key distinctions between the two claims

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4. Litigation / CAFC 2026 Docket Check

Result: No CAFC 2026 docket activity, and no district-court litigation, was found for US 5,535,531.

• My searches for "5535531" combos with "CAFC," "Federal Circuit," "appeal," "litigation," "lawsuit," and "infringement" returned no case naming this patent as an asserted patent. The CAFC and PACER-type hits returned concerned unrelated patents (e.g., CAFC 24-1235 on item-tracking, Firebug/Adidas-Nike knit-upper disputes, Centripetal v. Cisco, IPRs on Mobile Data Technologies patents).
• The only PTAB document hit matching "553" was a petition involving a different patent also colloquially called "the '553 patent" (US 7,455,553-class brimonidine/ocular subject matter) — i.e., a false positive, not US 5,535,531. I flag this explicitly because the "'553" shorthand is easily confused.
• This is consistent with the prosecution/legal history: the patent lapsed in 2000 for non-payment of maintenance fees and its anticipated expiration was 2014-04-28, so a 2026 Federal Circuit appeal of an infringement judgment on this patent is very unlikely.

Uncertainty statement: The absence of search hits is not proof of absence. I did not have direct, complete access to PACER, Docket Navigator, or Darts-IP; only publicly indexed web results. So I can state with reasonable confidence that there is no publicly indexed 2026 CAFC or district-court activity, but I cannot certify a negative for non-public or unindexed dockets.

Source URLs consulted:

• https://patents.google.com/patent/[US5535531A](/patent/US5535531A)/en
• https://patents.justia.com/patent/5535531
• https://www.freepatentsonline.com/5535531.html
• https://uspto.report/patent/grant/5535531
• http://www.everypatent.com/comp/pat5535531.html
• http://patentimages.storage.googleapis.com/e8/ab/9c/191191c4527c81/US5535531.pdf
• https://patents.searchlight.law/doc/US5535531
• https://portal.unifiedpatents.com/patents/patent/US-[12121109](/patent/12121109)-B2 (cites US-5535531-A; lists priority date 1994-04-27 and assignee "Individual")

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5. Analytical Notes / Caveats

1. Assignee is the inventors, individually. The record shows no corporate assignment, so "assignee" for US 5,535,531 = Razmik Karabed and Farhang Heydari (as individuals). Even so, the patent is heavily cited in Boa Technology and Nike lacing-system patent families (78–161 citing documents).
2. The claims are notably narrower than the specification's disclosure. The specification discloses at least eight embodiments (coil-spring units 13/15, curved hollow piece 71, X-shaped piece 81, U-shaped piece 121, beads 151/153/155, dual-hole piece 161, adjustable-length cylinder 201, and looped spring 211). The issued claims, however, require the "loop member" — which most closely corresponds to loops 215 of the FIG. 21a/21b embodiment (and functionally to the "holding extension" 167 of FIG. 18). I have not reviewed the prosecution history independently, so I cannot say with high confidence how or why the claims were narrowed to this feature; that is a genuine gap in my analysis rather than a confident finding.
3. Claim 2 is not tongue-limited and is directed at lace-on-lace (cord-on-cord) friction, which is a materially different scope from both the abstract and the specification's stated object (friction against the tongue/edges). This suggests the two claims were drafted to capture two distinct friction mechanisms.
4. Terminology in the specification is imprecise (e.g., "sc" appears to be a rendering artifact for "said"; "forth embodiment" for "fourth"; "farther" for "further"; a stray reference to "channels 82 and 4"). I am reading these literally as they appear in the provided text rather than correcting them.

I'll search for litigation involving US patent 5535531.

Let me run more targeted searches on litigation databases.

Litigation Search Report — U.S. Patent No. 5,535,531

Patent identified literally as: US 5,535,531 ("Shoelace rapid tightening apparatus"; inventors Razmik Karabed and Farhang Heydari; filed 1994‑04‑28; issued 1996‑07‑16; app. no. 08/234,172).

Bottom line

I found no litigation — no district court action, no CAFC appeal, no ITC Section 337 investigation, and no PTAB/AIA proceeding — involving U.S. Patent No. 5,535,531.

I want to be explicit that this is a negative finding based on the searches I was able to run, not a certification that no case ever existed. The patent's very short commercial life (see below) makes it highly unlikely any suit was filed.

Searches performed

I was not able to complete a direct query of the Unified Patents litigation portal or full PACER docket search before my search budget ran out; those remain the two gaps in this report. If you need a belt‑and‑suspenders confirmation, those are the sources to run manually.

Important disambiguation — do not confuse these "553" patents

My searches kept surfacing unrelated patents whose numbers contain or resemble 5535531. None of the following involve US 5,535,531:

• U.S. Patent No. 9,264,553 ("the '553 Patent," Pandey et al.) — Shure Inc. v. ClearOne, Inc., IPR2017‑01785 (PTAB); and ClearOne Inc. v. Shure Inc., No. 2:17‑cv‑00322‑CW (D. Utah) / Shure Inc. v. ClearOne, Inc., No. 1:17‑cv‑03078 (N.D. Ill.). This is a different patent — audio beamforming — and is the most common false positive for the number "553."
• The PharmaStem '553 patent — PharmaStem Therapeutics, Inc. v. Viacell, Inc., 491 F.3d 1342 (Fed. Cir. 2007). Again a different patent (cord blood), and the case number fragments (e.g., "2008‑1511") are also unrelated.
• U.S. Patent No. 5531951 — Wellman Inc. v. Teijin Ltd., 1:05‑cv‑01263 (E.D. Wis.).
• U.S. Patent No. 6585531 / 6,585,531 — Thomas & Betts Corp. v. Cooper Power Systems, 2:07‑cv‑00313 (E.D. Tex.) (different patent number; also a trademark Reg. No. 5,535,531 exists for "COYOMOSILE").

Corroborating context from the patent record itself

Two facts from the Google Patents record support the absence of litigation:

1. Prosecution history shows the patent was never asserted. Google Patents lists no "Cited By" litigation, and the "Cited By" entries are all later patent documents — mostly Boa Technology, Nike, Burton and Ossur footwear‑closure patents — i.e., citation‑based, not suit‑based.
2. The patent lapsed almost immediately. Per the Legal Events: Maintenance fee reminder mailed 2000‑02‑08; lapse for failure to pay maintenance fees 2000‑07‑16; "Lapsed due to failure to pay maintenance fee" effective 2000‑07‑16, with a later STCH entry (2018‑01‑26) confirming expiration under 37 CFR 1.362. A patent that went abandoned roughly four years post‑issuance would rarely have generated infringement litigation, and any infringement action filed after July 2000 would have had limited value.

Conclusion

No known litigation involves US 5,535,531. If your purpose is a freedom‑to‑operate or validity opinion, the relevant landscape is not litigation but the prior art cited on the face of the patent (US 811,872; 1,062,511; 1,070,797; DE 329580; US 1,502,919; 1,862,047; 3,934,346; 4,916,833; 4,958,459; 5,209,667) and the later Boa/Nike/Burton/Ossur closure‑system families that cite it. I can pull claim charts or a prior‑art analysis on request.

⚠️ Caveat: I was unable to complete Unified Patents portal and direct PACER queries. Recommend those two checks before relying on this as a final no‑litigation opinion.

I'll verify the structured data with targeted searches before reporting.

Let me run additional targeted checks for any AIA trial, litigation, or reexam activity tied specifically to this patent number.

Proceedings overview

Total AIA trial proceedings on file for US 5,535,531: ZERO. The USPTO Open Data Portal "PTAB proceedings on file" block — the canonical source — returns no IPR, PGR, or CBM for this patent, and independent web searching surfaced no AIA trial, no Federal Circuit appeal of any PTAB decision, and no defensive-aggregator challenge tied to this patent number. The breakdown is therefore 0 active / 0 claims invalidated / 0 claims sustained / 0 settled / 0 institution denials — an empty set, not a lopsided one.

The bottom line for a defendant is not "the patent has been hardened by surviving IPRs." It has never been tested in an AIA trial, and it never needed to be. US 5,535,531 lapsed for failure to pay its 4-year maintenance fee, with the lapse effective 2000-07-16 (USPTO legal events: REMI maintenance fee reminder mailed 2000-02-08; LAPS lapse 2000-07-16; FP lapsed due to failure to pay maintenance fee effective 2000-07-16). Claims 1 and 2 were never adjudicated anywhere — they simply went unenforced long enough to expire for non-payment. Any assertion of this patent today is answered by the expiration date on its face, not by an IPR.

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No AIA trial proceedings identified — Karabed & Heydari (individual inventors)

On the record available, there is no proceeding to report at the per-proceeding level. What I can state with confidence:

• Type: n/a — no Inter Partes Review, Post-Grant Review, or Covered Business Method review is on file.
• Filed: n/a
• Status: "no PTAB activity on file" (per the structured ODP block); independently corroborated by web search.
• Judge panel: n/a
• Petition grounds: n/a
• Institution decision: n/a
• Final Written Decision: n/a — no claim of this patent has ever been canceled or confirmed by the Board.
• Settlement / termination: n/a
• Appeal: no CAFC appeal of any PTAB decision exists, because no PTAB decision exists. The Federal Circuit hit in my searches (gov.uscourts.cafc.18561) is the Apple v. Masimo IPR2020-01536 appeal concerning U.S. 10,588,553 — a different patent that merely shares the "553" suffix.
• Defensive value: An IPR-based defense is unnecessary. The patent expired in 2000 for non-payment of maintenance fees, so there is no live claim to attack, and any IPR you filed would be an expensive way to reach the same conclusion an uncertified copy of the file history reaches for free.

False-positive flag (searches contained these; none are this patent): U.S. 9,264,553 (Shure v. ClearOne, IPR of Pandey beamforming/AEC claims 1–20); U.S. 6,009,553 (Cellco/Verizon et al. v. Orlando Communications, IPR2015-01573, claims 1, 2, 5, 8, 9 instituted); U.S. 10,588,553 (Apple v. Masimo, IPR2020-01536); U.S. 10,323,553 (BASF v. Ingevity, PGR2020-00037). None involve Karabed/Heydari or the shoelace art.

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Strategic summary

Claim status — nothing canceled, nothing sustained, nothing tested. US 5,535,531 has exactly two claims: claim 1 (a "laced shoe assembly ... improvement comprising" claim with a friction-reducing device having a bottom side contacting the tongue upper surface and "a loop member protruding therefrom in a direction generally opposite said bottom side") and claim 2 (a laced shoe assembly with a cord whose common contacting portions contact one another, plus the same loop-member limitation against a "support surface"). Neither was ever construed by a court or the Board. Both are UNTESTED in every adversarial forum — but both are also EXPIRED as of 2000-07-16. That distinction matters: you cannot rely on "claims are valid" or "claims are invalid" as a shortcut; you rely on the lapse.

Estoppel landscape — § 315(e)(2) is a non-issue here. Because no IPR/PGR was ever instituted, no petitioner or privy is estopped from anything, and no prior-art ground has been foreclosed for anyone. There is also no litigation-driven estoppel to map, because I found no infringement action asserting this patent. Practically, the entire prior art universe remains available to anyone who wanted to challenge it — a purely academic point given the 2000 lapse, but worth stating plainly so no one over-reads the empty docket as "the art was already spent."

Pattern signals. There is no pattern to report: no repeat petitioner, no patent owner appeals (the patent never reached the Board), no Unified Patents or other aggregator involvement. The only striking pattern is commercial, not adversarial: this reference shows up as a cited prior-art document in dozens of later lacing patents — e.g., it appears in the "References Cited" of US 5,713,142, US 5,577,278-adjacent lacing art, US 8,516,662 and US 8,474,157 (Boa/Senizergues line), and in the CN/GB family citations of modern reel-based lacing systems. In other words, 5,535,531's real-world significance is as prior art that others had to design around, not as an asserted patent. That is consistent with the inventors being individuals (Karabed; Heydari, both of San Jose, CA) who paid no maintenance fee and never litigated.

Caveat on completeness. The ODP block is authoritative for AIA trials, and my web searches did not surface any older or recently-filed proceeding. I could not positively confirm the absence of every non-AIA event (e.g., a 1990s-era district court suit or a pre-AIA ex parte reexamination), because such records are not fully indexed by the sources I could reach. I would not state as fact that none ever existed; I can state that none was found and that no reexamination certificate is reflected in the patent's public record.

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Recommended next steps

• If you hold a demand letter or complaint citing US 5,535,531: check the expiration date before anything else. USPTO legal events show lapse for failure to pay maintenance fees effective 2000-07-16, and Google Patents/Patents legal-status for this grant reads "Expired - Fee Related." Under 35 U.S.C. § 286, even a then-valid recovery window is limited to six years back from suit — and the patent's enforceable life ended roughly 26 years ago. There is no live infringement theory.
• Do not build an IPR strategy around this patent. There is no FWD to link and no claim disposition to quote, because no proceeding was ever instituted. Cite instead the maintenance-fee lapse record on the face of the patent: USPTO PatentCenter for US 5,535,531 and the Google Patents legal-events page (Legal Events: 2000-02-08 REMI; 2000-07-16 LAPS; 2000-09-26 FP, "Lapsed due to failure to pay maintenance fee," effective date 2000-07-16).
• If you want to confirm the empty docket yourself, query the PTAB End-to-End (E2E) system and the PTAB Decisions page for "5,535,531" and "IPR/PGR/CBM" — you should get zero hits, matching the ODP block.
• Prophylactic note for the record: if a plaintiff nonetheless asserts this patent, the affirmative defenses to preserve are non-infringement (no accused product practices the two-claim scope, and the "loop member protruding ... generally opposite said bottom side" limitation of both claims is narrow), invalidity (the art is entirely untested — see the ten references of record, including Ries US 811,872, Short US 1,062,511, Gordon US 1,079,797, Seib US 1,502,919, Boulet US 1,862,047, Sasaki US 3,934,346, Nwoko US 4,916,833, Davidson US 4,958,459, Stanfield US 5,209,667, and DE 329,580), and — most decisively — expiration/unenforceability due to lapse, together with laches and § 286 damages limitation.

One structural observation, stated plainly per the brief: the absence of PTAB activity here is not the usual signal that a patent is quietly valuable and untested. Here the absence correlates with abandonment in 2000. The defensive posture is therefore maximally favorable and cheap: an expired, never-asserted, individual-owned two-claim patent whose claims have never been construed and whose enforceable term ended before the AIA's IPR regime even existed.

I'll research the assignment chain for US 5,535,531.

Let me dig into the assignment records and inventor background.

Ownership & Assignment Analysis — U.S. Patent No. 5,535,531

Patent: US 5,535,531 A — "Shoelace rapid tightening apparatus"
App. No.: 08/234,172 · Filed: 1994‑04‑28 · Issued: 1996‑07‑16
Classification: A43C 11/22; A43C 7/00; A43D 999/00; Y10T 24/3768

Tooling caveat up front. My only research instrument in this session is a web-search interface, not a direct API client. I could not issue a machine query against assignmentcenter.uspto.gov / assignment.uspto.gov (both are JSON endpoints that a search engine does not surface directly). The no‑assignment finding below therefore rests on three mirrors of the USPTO assignment/legal‑events data — Google Patents, uspto.report, and the Unified Patents portal — which agree, plus the absence of any assignee designation on the face of the patent. Treat it as a strong negative finding that merits a 60‑second manual confirmation at the Assignment Center link in the Verdict section.

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Inventors

Unusual patterns — and the one that actually matters here:

1. No corporate co‑inventor and no corporate assignee. The invention sits in a field (footwear closures) where both named inventors appear to be outsiders — Karabed's documented career is data‑storage channel coding, not footwear. A two‑person, individual‑owned filing in a field unrelated to either inventor's day job is the classic signature of a side project / garage filing, not a corporate portfolio asset.
2. No family. Google Patents lists exactly one family application (US 08/234,172) and one country status (US). No continuation, no divisional, no CIP, no PCT, no foreign counterparts. A company that intended to commercialize or assert a closure technology would almost invariably file at least one continuation or a foreign counterpart. The absence is evidence against any enforcement program ever having existed.
3. The "inventors departing the original assignee within 12 months" tell is inapplicable — there was no original assignee entity to depart from. This is itself the finding: the inventors were the assignee from day one.
4. Drafting quality. The specification contains a high density of self-referential errors ("friction reducing channel 4" for 84; "the next eight designs" following a nine‑figure group; "forth" for "fourth"; FIG. 21 referenced in text vs. FIG. 21a in the drawing list). The claims are in Jepson format ("In a laced shoe assembly including … the improvement comprising:"), which is a format an experienced patent attorney would generally avoid for a standalone device. Together with the absence of an assignment, this is consistent with a self‑drafted or lightly‑supervised filing.

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Original assignee

There is no original assignee entity. The patent issued with the inventors as the owners of record. Both Google Patents and the Unified Patents portal list the assignee as "Individual" — the databases' placeholder for "no corporate assignee recorded."

• Entity named on the issued patent: none (no (73) Assignee line). Title vested in Razmik Karabed and Farhang Heydari as individuals.
• Product embodying the claims: No evidence of any commercial product. The specification is written in "kit" terms (a soft plastic pin or wire "recommended as part of any kit which includes a friction reducing device"; a kit "could include a variety of sizes"). That is a contemplated retail accessory, not a shipped product. I found no product, brand, or licensee associated with either inventor.
• Primary line of business: N/A for the patent; Karabed's actual line of business is semiconductor data‑storage signal processing.
• Current status: The patent itself is expired and in the public domain. Legal events: maintenance‑fee reminder mailed 2000‑02‑08; "Lapse for failure to pay maintenance fees" 2000‑07‑16; confirmed by a 2018‑01‑26 STCH entry citing 37 CFR 1.362. The 3.5‑year maintenance‑fee grace window closed on 2000‑07‑16, roughly four years post‑issuance and fourteen years before the 2014‑04‑28 full‑term date that Google Patents lists as merely "anticipated."

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Assignment timeline

The USPTO assignment record for this patent is empty. There are no recorded assignments — no reel/frame entries, no assignors, no assignees, and consequently no correspondent of record to analyze.

I am stating that plainly rather than listing a fabricated chain. It was independently checked across:

Interpretation. Per your own framing, this is itself the finding: no recorded post‑issuance assignments means the original owner — the two individual inventors — retained title for the entire enforceable life of the patent, and the patent then lapsed. There is no shell entity, no licensing vehicle, no securitization, and no transfer‑to‑asserter event to reconstruct. The chain is a single node: inventors → (lapse) → public domain.

Record caveat worth logging while reading the claims. Both claims 1 and 2 as presented in the authoritative full text end with: "said friction reducing device [claim 1] / said device body [claim 2] including a loop member protruding therefrom in a direction generally opposite said bottom side." That "loop member … opposite said bottom side" language has no clean antecedent in the written description, whose only "loop" terminology is loops 215 of FIG. 21a. I flag it rather than resolve it: it reads as either (a) a post‑allowance/ Examiner‑initiated amendment whose support question was never litigated, or (b) a text‑extraction artifact. Either way it narrows the claims and is irrelevant to ownership, but it is the kind of scope defect that would have made the patent hard to assert had anyone tried. Worth a look at the patentimages PDF before you rely on the claim text.

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Timeline diagram

timeline
    title Ownership of US 5535531
    1994 : Filed by two individual inventors
         : No corporate assignee recorded
    1996 : Patent US 5535531 issues Jul 16
    2000 : Maintenance fee reminder mailed Feb 8
         : Lapse for nonpayment Jul 16
    2014 : Full 20 year term would have ended
    2018 : USPTO confirms expiration under 37 CFR 1.362

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NPE / troll-pattern signals

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Verdict

Insufficient data (no records, or only the original assignment) — with the affirmative gloss that the reason for the insufficiency is total: there is no assignment chain at all.

This is not a case where the record is missing or redacted; it is a case where the event never occurred. Title stayed with Razmik Karabed and Farhang Heydari as individuals from filing (1994‑04‑28) through issuance (1996‑07‑16) and for the entire four years the patent was in force, ending with the 2000‑07‑16 lapse for nonpayment of the 3.5‑year maintenance fee (Legal Events REMI 2000‑02‑08 / LAPS 2000‑07‑16; confirmed 2018‑01‑26 under 37 CFR 1.362). All eight NPE signals come back not present, and the antecedent question — "did an operating company ever hold this patent and then hand it to an asserter?" — resolves to no operating company ever held it. The "NPE" characterization categories simply do not engage.

One forward‑looking note for a freedom‑to‑operate or validity opinion: because the patent lapsed more than 26 years ago and the full 20‑year term (2014‑04‑28) has run, no ownership‑side risk attaches regardless of who would have owned it. The residual relevance of 5,535,531 is purely as prior art — it is cited on the face of at least one live shoelace‑fastener application (US 2022/0304424 A1, "Shoelace Locking Apparatus," Law Office of Michael D. Eisenberg) and sits in the citation lineage of the Boa Technology / Nike / Burton / Ossur closure families.

Verify at:

• USPTO Assignment Center (search by patent number): https://assignmentcenter.uspto.gov/
• Legacy USPTO Assignments on the Web: https://assignment.uspto.gov/patent/index.html
• Google Patents legal events: https://patents.google.com/patent/US5535531A/en
• Round‑trip check: https://uspto.report/patent/grant/5535531 and https://portal.unifiedpatents.com/patents/patent/US-5535531-A

Cross‑reference check against the earlier section: no contradiction. The litigation summary's finding of zero litigation is fully consistent with — and now explained by — the ownership record: a patent held by two individuals with no company, no continuation family, and a very short four‑year life offered essentially nothing to assert and was abandoned on the first maintenance‑fee deadline. The only factual divergence between the two analyses is the one‑day priority discrepancy on the Unified Patents portal (1994‑04‑27 vs. 1994‑04‑28), which I flagged above and which does not affect either conclusion.

I'll verify each cited reference against live sources before charting them against the claims. Let me run targeted searches.

Let me now verify the remaining cited references.

Prior-Art Analysis — U.S. Patent No. 5,535,531

Patent under analysis (literal): US 5,535,531 — "Shoelace rapid tightening apparatus" — Karabed & Heydari — App. No. 08/234,172 — filed 1994-04-28 — issued 1996-07-16.
Source of record: https://patents.google.com/patent/US5535531/en

This section builds on the earlier Litigation summary, which found no litigation and expressly recommended that the relevant landscape "is not litigation but the prior art cited on the face of the patent." That is the task undertaken here.

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1. Sourcing / method note (read this before relying on the chart)

• I did not obtain a direct query result from the USPTO Patent Public Search or PatentCenter interfaces before my search budget was exhausted. The authoritative text used here is the full front-page citation list and claim set of US 5,535,531 as rendered on Google Patents (mirrored from the USPTO file), plus individual reference documents retrieved from USPTO-mirrored image stores (patentimages.storage.googleapis.com) and Google Patents.
• I retrieved and read the full text of 4 of the 10 cited references: US 811,872; US 1,062,511; US 1,070,797; US 1,502,919. For the other 6 I have only the citation-level metadata (number, title, inventor, filing/publication date) plus, for US 4,916,833, the description in the '531 Background Art. Those six are flagged [UNVERIFIED — citation-level only] and any substantive statement about them is labeled as inference.
• No patent number has been auto-corrected. DE329580C, US4958459A, US5209667A, etc. are reproduced exactly as they appear on the face of the '531 patent.

2. Legal framework (this is a pre-AIA patent)

The application was filed 1994-04-28, before the first-to-file provisions of the AIA (effective 2013-03-16). Accordingly pre-AIA 35 U.S.C. § 102/§ 103 govern.

• Every cited reference issued more than one year before the 1994-04-28 filing date. Each is therefore a § 102(b) printed publication and, as such, qualifies both as anticipation art and as § 103 obviousness art.
• Anticipation requires a single reference disclosing every element of the claim, arranged as claimed. That is the standard applied per reference below.
• The two claims are structurally different, and this matters:
  • Claim 1 is an improvement claim: preamble = shoe environment including a tongue; improvement = friction-reducing device between the two edges, bottom side contacting the tongue upper surface, first friction-reducing channel receiving the lace contact portion, separating it from friction with the tongue, plus a loop member protruding generally opposite the bottom side.
  • Claim 2 is independent and broader in one respect and narrower in another: it recites a "support surface" (no tongue required) and requires that "common contacting portions of the cord … contact one another" and that the channel separate those common contact portions from frictional contact with one another — i.e., isolation of lace-on-lace friction, not just lace-on-shoe friction. It also carries the same loop-member limitation.

3. The ten cited references — at a glance

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4. Per-reference analysis

4.1 — US 811,872 A (Ries, "Lacing device") — the most structurally dangerous reference

Citation: US 811,872 A; filed 1904-06-18 (Ser. No. 213,085); patented 1906-02-06; Moses Ries, Milwaukee, Wisconsin.
Sources: https://patents.google.com/patent/[US811872](/patent/US811872) · PDF: https://patentimages.storage.googleapis.com/17/f6/78/6fd45dba6f8578/US811872.pdf

Disclosure (verbatim grounding): flaps 5, tongue member 6 behind the opening, ordinary eyelets 7, lacing 8. Above the eyelets, the flap edges carry lacing‑guides comprising rivet‑like securing portions 9 and curved guide‑tubes 10 "on the front surface … near to the opening between the flaps, with their ends extending toward said opening." Intermediate lacing‑guides are arranged on the tongue 6 midway between the pairs of the other guides, each comprising a securing portion 11 carrying "a pair of curved guide‑tubes 12 … placed back to back." The specification states the lacing "passed through the several guide‑tubes … is comparatively free of frictional engagement therewith," which speeds opening/unlacing.

Where it reads on the '531 claims:

§ 102 conclusion: US 811,872 discloses the entire functional core of the '531 invention (a channel body sitting on the tongue between the edges and carrying the lace free of tongue friction) — a century earlier. It does not anticipate claim 1 or claim 2 as issued, because it lacks the "loop member protruding … generally opposite said bottom side." It would, however, anticipate any claim of the '531 specification drafted without the loop-member limitation — i.e., it is the single best § 102(b) reference against the generic friction-reducing-channel concept. As a § 103 reference it is primary.

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4.2 — US 1,062,511 A (Short, "Boot-lace") — the key reference for the spring and the "loop member"

Citation: US 1,062,511 A; filed 1912-06-19 (Ser. No. 704,559); patented 1913-05-20; Henry William Short, London. (A counterpart is GB 1913/13,921.)
Sources: https://patents.google.com/patent/[US1062511A](/patent/US1062511A) · PDF: https://patentimages.storage.googleapis.com/5e/f7/13/30a3ada030a265/US1062511.pdf

Disclosure (verbatim grounding): an essentially endless lace joined by a spring-coupling at the top bight. The coupling is "a coiled spring e … and a pair of eyes f, f formed on the ends of the coil e and adapted to give passage to the respective members" of the lace. The eyes are "preferably each formed by a terminal convolution of the coil e being bent down out of its original position." When laced, the spring-coupling "constitutes a cross-bar which engages over the tops of the uppermost pair d¹ of the hooks."

Where it reads on the '531 claims:

• Loop member: the eyes f, f are literally loops through which the lace is threaded, formed on a coil spring. This is the closest prior disclosure of the '531 loop member (which in the '531 patent appears as loops 215 affixed to spring 213, FIG. 21a).
• Spring/elastic uptake: the closely-wound coil spring is the structural ancestor of the '531 first-embodiment coil spring units 13/15 and the FIG. 21 spring 213.
• Not disclosed: placement between the edges over the tongue in the throat of the lacing (Short's coupling sits only at the topmost bight, and the boot interacts with hooks d, not eyelets); no tongue-contacting bottom side; no separation of lace from a tongue upper surface; no separation of lace-on-lace contact.

§ 102 conclusion: Does not anticipate claim 1 or claim 2. It is a strong § 103 secondary reference supplying (i) the spring element and (ii) lace-receiving loops on a spring, to be combined with a channel-over-the-tongue reference such as US 811,872. Note that the '531 applicant's own FIG. 21 description concedes this lineage: "Spring 213, like spring 23 of the first embodiment, is shaped semicircular out of a plastic or a metallic material."

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4.3 — US 1,070,797 A (Gordon, ironing-board cover fastening)

Citation: US 1,070,797 A; filed 1912-04-10 (Ser. No. 689,750); patented 1913-08-19; Elise D. Gordon, West Roxbury, Massachusetts.
Source: https://patents.google.com/patent/US1070797

Disclosure (verbatim grounding): a cord-and-pin "tackle" for drawing fabric edges together. The pins/eyelets are described such that "when there is tension on the cord the cylinder will bend a little, furnishing a smooth curved guide through which the cord may slip when drawn."

Where it reads: discloses the generic principle — routing a tensioned cord through a smooth curved guide (channel) to reduce sliding friction. Full text contains no shoe, no tongue, no eyelet pairs, no loop member.

§ 102 conclusion: No anticipation of claim 1 or claim 2 — every claim requires a shoe upper/tongue (claim 1) or a shoe upper with eyelets (claim 2). Relevance is limited to a § 103 "friction-reducing channel" concept reference, and its value is weakened by the non-analogous-art question (ironing-board covers vs. footwear lacing). Treat it as cumulative to US 811,872.

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4.4 — DE 329,580 C (Paul Balzer) — [UNVERIFIED]

Citation: DE 329,580 C; publication date 1920-11-24 (priority field blank on the '531 face); "Device for forming a lace loop for lace fasteners."
Source: no reliable disclosure text obtained; my search queries for this number returned only unrelated material. Google Patents lists it at https://patents.google.com/patent/DE329580C (not retrieved here).

Assessment: The translated title indicates a lace-loop-forming device, which on its face is probative of the "loop member" limitation and of the general lacing habit of forming lace loops. I cannot responsibly quote its disclosure, so no § 102 mapping is offered. Action item: retrieve the DE 329,580 C specification and, if needed, a certified translation before relying on it — this is precisely the kind of reference an examiner would use against the loop-member limitation.

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4.5 — US 1,502,919 A (Seib, "Shoe") — strongest reference for "positioned between the edges"

Citation: US 1,502,919 A; filed 1922-07-10 (Ser. No. 574,039); patented 1924-07-29; Frank A. Seib, Detroit, Michigan.
Source: PDF: https://patentimages.storage.googleapis.com/b1/09/11/c728b42b5b2438/US1502919.pdf

Disclosure (verbatim grounding): upper sections 1, 2 with "front edges spaced from each other"; eyelets 4 and 5 "secured respectively to the edges of the upper sections … and normally arranged in the space therebetween," the two series "in staggered relation"; each eyelet has a curved tubular body 6 curving away from the edge. A single lace 8 runs through the eyelets. At the top, cleats 10 "having outwardly curved cross pieces 11 and transversely extending shanks 12" secure the lace when taut, the lace being wound around the cleat shanks.

Where it reads on the '531 claims:

§ 102 conclusion: No anticipation of claim 1 (no tongue, no loop member) and no anticipation of claim 2 (no loop member; and no disclosure of common contact portions of cord contacting one another being separated — Seib's aim is the opposite, keeping the lace from crossing on itself by anchoring it at the cleats). It is an important § 102(b) element reference for the "between the edges" and "curved channel" limitations.

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4.6 — US 1,862,047 A (Boulet, "Shoe fastening device") — [UNVERIFIED]

Citation: US 1,862,047 A; filed 1930-07-08; patented 1932-06-07; Robert L. Boulet.
Assessment: Title indicates a shoe fastening; potentially relevant to the "between the edges" and lace-retention limitations. No disclosure text obtained — no § 102 mapping offered. Action item: pull the specification, especially to check for any spring or loop element.

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4.7 — US 3,934,346 A (Sasaki, "Sporting shoes") — [UNVERIFIED]

Citation: US 3,934,346 A; filed 1974-12-12; patented 1976-01-27; Kyozo Sasaki.
Assessment: No disclosure obtained. This is the only mid-1970s reference and the closest in age to a modern athletic shoe, so it is worth checking whether it discloses a lace-guide or tongue-mounted element. No § 102 mapping offered.

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4.8 — US 4,916,833 A (Nwoko) — the reference the applicant actually confronted (the "admitted prior art")

Citation: US 4,916,833 A; filed 1988-11-25; patented 1990-04-17; Luck Nwoko. Also the subject of the sole Non-Patent Citation: "Official Gazette Abstract on U.S. Patent 4,916,833."
Source: https://patents.google.com/patent/[US4916833A](/patent/US4916833A)

Disclosure as characterized in the '531 Background Art (this is the applicant's own statement — legally an admission):

"discloses a dual shoe eyelet device for faster lacing. Each eyelet provides special slots which laced by slipping the laces through the eyelet slots rather than threading the laces through the narrower conventional eyelets. These eyelet devices are fixedly attached to the shoe and are not part of the conventional shoe."

The applicant then drew the distinction on which the '531 case rests:

"While this approach does reduce friction forces between the lace and the eyelets, the large frictional forces caused between the overlapping laces and the edges, and the frictional forces between the laces and the tongue portion of the upper cover are still abundant… Moreover, this device fails to address the difficulty in holding and pulling the lace."

Where it reads on the '531 claims: A friction-reducing lace guide mounted at the shoe opening, receiving the lace in a slot/channel to reduce friction during tightening/loosening, and imparting a graspable structure to the lace run.

§ 102 conclusion: Anticipates neither claim 1 nor claim 2 as issued — no channel over the tongue upper surface, no tongue-contacting bottom side, and no loop member protruding opposite a bottom side. Critically, however, the applicant's own characterization concedes that US 4,916,833 teaches the "friction-reducing channel that receives the lace" element in footwear. That reduces the '531 novelty to (i) relocating the channel to between the edges over the tongue and (ii) the loop member. For § 103 purposes, US 4,916,833 + US 811,872 is a natural combination.

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4.9 — US 4,958,459 A (Davidson, "Letter lace") — [UNVERIFIED]

Citation: US 4,958,459 A; filed 1989-01-06; patented 1990-09-25; Davidson Orlando D.
Assessment: The title ("Letter lace") suggests an alphanumeric/instructional lace rather than a mechanical guide. If it discloses only indicia on a lace, its § 102/§ 103 value is minimal. No disclosure text obtained — no mapping offered.

4.10 — US 5,209,667 A (Stanfield, "Teaching shoelace") — [UNVERIFIED]

Citation: US 5,209,667 A; filed 1990-03-12; patented 1993-05-11; Stanfield James S.
Assessment: This is the newest cited reference (issued ~13 months before the '531 filing, hence squarely § 102(b)). "Teaching shoelace" implies a color-coded/two-tone lace for teaching children to tie — consistent with the '531 specification's stated motivation ("Fastening and unfastening laces is usually frustrating for children"). Likely cumulative, but no disclosure text obtained — no mapping offered.

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5. Consolidated anticipation / obviousness grid

Legend: ● = discloses element · ◐ = arguably discloses · ○ = does not disclose · bold = the '531 point of novelty

Result:

• No cited reference anticipates claim 1 or claim 2 as issued. No single reference discloses the loop member protruding in a direction generally opposite the bottom side, and none discloses a channel body over the tongue with a tongue-contacting bottom side plus that loop member. Anticipation (§ 102(b)) therefore fails for both claims on the present record.
• Anticipation is nonetheless close for the generic concept. US 811,872 alone discloses a channel-body-over-the-tongue reducing lace/tongue friction — absent only the loop-member limitation. If a broader claim had been pursued without the loop member, US 811,872 is a § 102(b) killer.
• The most probable § 103 attack:
  • US 4,916,833 (friction-reducing lace guide for a shoe, admitted by the applicant to reduce lace/eyelet friction) + US 811,872 (curved guide-tubes seated on the tongue between the flaps, "comparatively free of frictional engagement") + US 1,062,511 (coil spring with lace-receiving eyes/loops) → renders claim 1 obvious; motivation is the '531 specification's own statement of the problem (friction at the eyelets, edges, and tongue, and the difficulty of grasping the lace).
  • Same set + US 5,209,667 (teaching shoelace) addresses claim 2's lace-on-lace and pullability aspects only if US 5,209,667 discloses anything structural — currently unchecked.
• Claim 2 is the more vulnerable claim on the loop-member/spring axis but the less vulnerable claim on the "common contact portions contacting one another" axis, because that limitation (separating lace from itself) is not taught by any verified reference. US 1,062,511 is the only reference dealing with a lace's two members meeting at a bight, and it separates them via the spring cross-bar rather than by isolating mutual contact.

6. Where the exposure actually sits

1. The "loop member" is the entire novelty story. Every verified reference fails on it. It also maps directly onto DE 329,580 C ("Device for forming a lace loop") — the one cited reference I could not read. Retrieving DE 329,580 C is the single highest-value next step for validity.
2. US 811,872 is the sleeper reference. It predates the '531 patent by ~90 years, sits in the identical technological field (shoe lacing; channel over the tongue), and uses the identical functional language ("free of frictional engagement"). An examiner or litigant working only from the '531 Background Art (which discusses only US 4,916,833) would miss it; it should be central to any invalidity contentions.
3. The applicant conceded the "channel" concept in the Background Art by describing US 4,916,833 as reducing lace/eyelet friction. That admission narrows the distance between the prior art and claim 1.
4. Consistency with the earlier litigation section: the "Cited By" families (Boa Technology, Nike, Burton, Ossur) are citation-based, not suit-based, and are all post-1996. They are not § 102(b) art against the '531 patent (they postdate it) — they matter only as evidence of the later commercial direction of this field (reel-based, channel/guide-based lace routing), which is consistent with the guide/channel concept being old.

7. Explicit gaps — do not treat this as a final validity opinion

• Six of the ten cited references were not read (DE 329,580 C; US 1,862,047; US 3,934,346; US 4,958,459; US 5,209,667; and the NPL Official Gazette abstract). For these, no § 102 mapping is asserted, and any inference is labeled as such. Statements above about their likely subject matter are inferences from title metadata only, not verified disclosures.
• No direct USPTO database query was completed. The record relied on is the Google Patents rendering of the USPTO file plus USPTO-mirrored reference images.
• Only the two issued claims were charted. The '531 specification describes at least eight embodiments (FIGS. 1–21) far broader than the claims; those unclaimed embodiments are dedicated to the public and are separately anticipated by the art above (notably US 811,872 and US 1,062,511).
• Recommended next steps: (a) fetch DE 329,580 C with translation; (b) read US 1,862,047 and US 3,934,346; (c) confirm US 5,209,667 and US 4,958,459 contain no structural guide; (d) pull the '531 file wrapper to see which cited references the examiner actually relied on and whether the loop-member limitation was added to overcome any of them.

Bottom line on the specific question asked: of the ten references cited on the face of US 5,535,531, none appears to anticipate claim 1 or claim 2 under § 102, because none discloses the claimed loop member protruding generally opposite the device's bottom side; the references most probative of the remaining elements are US 4,916,833 (friction-reducing lace guide in footwear — admitted prior art), US 811,872 (channel over the tongue, free of frictional engagement), US 1,062,511 (spring with lace-receiving loops), and US 1,502,919 (lace guides positioned between the shoe edges).

I'll ground this § 103 analysis in the actual prior-art references on the face of US 5,535,531. Let me verify the subject matter of the most important ones rather than relying on titles alone.

Now let me verify the older cited references — particularly DE 329,580 (Balzer) and US 811,872 (Ries), which are the most likely candidates for the "loop member" element.

The DE 329,580 search returned only noise. Let me try the Google Patents record directly plus the remaining cited US references.

Obviousness Analysis — U.S. Patent No. 5,535,531

"Shoelace rapid tightening apparatus" (Karabed & Heydari; filed 1994‑04‑28; issued 1996‑07‑16; app. 08/234,172)

Governing law note: This application was filed before 16 March 2013, so pre‑AIA 35 U.S.C. § 103(a) applies, as construed in KSR Int'l Co. v. Teleflex Inc., 550 U.S. 398 (2007), and Graham v. John Deere Co., 383 U.S. 1 (1966). The KSR "expanded" motivation analysis (predictable use of prior art elements according to their established functions; market/design demand; design incentives) applies notwithstanding the patent's 1996 issue date.

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A. Scope, sources, and explicit caveats

Primary source (treated as authoritative): the full text and front page of US 5,535,531 at https://patents.google.com/patent/US5535531/en, including its "Patent Citations (10)" list and the examiner's "Non‑Patent Citations (1)."

References I independently verified by search (content confirmed, not merely title):

References I could NOT verify beyond the title/date appearing on the '531 face — treat as leads, not confirmed teachings:
US 1,062,511 (Short, "Boot‑lace"); US 1,070,797 (Gordon, "Fastening for ironing‑board covers and the like"); DE 329,580 (Balzer, "Device for forming a lace loop for lace fasteners"); US 1,502,919 (Seib, "Shoe"); US 1,862,047 (Boulet, "Shoe fastening device"); US 4,958,459 (Davidson, "Letter lace"); US 5,209,667 (Stanfield, "Teaching shoelace"). My searches for DE 329,580 returned only unrelated material (Italian parliamentary records, lace‑making machinery patents), so I explicitly decline to characterize its disclosure. See §H — this matters significantly for the "loop member" element.

Not available to me: the prosecution history (Office actions, examiner's § 103 rejections, applicant remarks), any Rule 132 declaration, and any deposition/PTAB record. No obviousness rejection of record is reproduced on the Google Patents page. Everything below is my independent analysis, not a restatement of an examiner's position.

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B. The claims, literally, and construction of the operative terms

Both claims are reproduced verbatim above in the record. Two structural observations drive everything that follows:

1. Claim 1 is a Jepson‑format improvement claim — "In a laced shoe assembly including … the improvement comprising: …". Under In re Ehrreich, 590 F.2d 902, 909 (CCPA 1979), and In re Fout, 675 F.2d 297, 300 (CCPA 1982), material recited before "the improvement comprising" is admitted prior art. That admission is corroborated by the specification itself ("the laces are generally laced in a criss‑cross or overlapping pattern over the tongue portion. Hence, a relatively large surface area of the laces is in frictional contact therewith").
2. Both claims recite a broad genus, not any of the nine illustrated embodiments. The claims do not require springs, coil geometry, semi‑circular cross‑sections, an X‑shape, a U‑shape, beads, elasticity, or adjustability. Every species disclosed in FIGS. 1–21 is unclaimed subject matter. Under In re Gosteli, 872 F.2d 1008, 1010 (Fed. Cir. 1989), a prior‑art species falling within a claimed genus anticipates the genus claim — so the breadth of claims 1–2 is a liability, not an asset.

Limitation construction

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C. Claim 1 — element‑by‑element mapping

Conclusion on claim 1: Elements (a)–(d) are squarely met by Ries '872 alone, a reference the examiner cited and that is § 102(b) art by roughly eighty‑eight years. The only genuine dispute is element (e).

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D. Claim 2 — element‑by‑element mapping

Critical gap in claim 2's strongest single reference: Sasaki's tube 15 does not separate the two strings from one another — the strings are described as "combin[ing] in mutual contact through a flexible tube 15." So Sasaki alone does not anticipate claim 2 (Net MoneyIN, Inc. v. VeriSign, Inc., 545 F.3d 1359, 1371 (Fed. Cir. 2008)). It is, however, an excellent § 103 primary reference when paired with US 4,670,949 or Nwoko '833.

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E. Grounds of rejection under § 103

Ground A (strongest) — Ries '872 in view of Nwoko '763

Claim 1. Ries discloses a tongue‑mounted lacing guide positioned between the flap edges, bearing on the tongue, having guide‑tubes that receive the lace and separate it from the tongue, and Ries states the very purpose recited in claim 1 ("too much friction to permit of the free sliding of the lacing"). Nwoko '763 supplies the "loop member protruding" element (outer loop 36 rising from the fastening device body).

Motivation to combine (KSR‑sufficient):

• Same field, same problem, same solution mechanism. All three references are shoe‑throat lacing hardware; both Ries and Nwoko state friction/threading ease as their express objects. KSR, 550 U.S. at 415 ("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").
• The patentee's own admitted design objectives supply the motivation. The specification states a third object: "to provide a lace apparatus which facilitates retainment of the lace," and repeatedly praises embodiments because "they can be held and pulled with a greater ease than a plain lace," "it takes less effort to grab and hold the lace," and "the shape of piece 121 make holding and pulling of lace 61 significantly easier." Nwoko '763's outer loop is a known, off‑the‑shelf structure serving that exact function.
• Predictable result, no new mechanism. Adding an encircling/grasping loop to a lace‑guide body is a change in shape, not in principle; the result (a lace that is easier to grip) is precisely the expected function.
• There is no teaching away in any of the three.

Ground B — Sasaki '346 in view of Ries '872 (and Nwoko '763)

Claim 2 (and claim 1). Sasaki discloses the spatial concept of claim 2: a tube at the middle portion of the lace, spanning the opening between the two hole rows, with the lace passing through it. Ries contributes the express purpose of friction reduction by interposing a guide between lace and shoe structure. To reach the claim‑2 functional limitation "separating said common contact portions from frictional contact with one another," the examiner adds US 4,670,949, whose specification states that staggered eyelets may be provided "in any laced shoe where friction between one lace portion and another overlapping lace portion is desired to be minimized."

Motivation: the patent's entire stated rationale ("Part of the frustration stems from the friction between the laces and the upper covers of the shoe … This is especially true … at the tongue portion … since the laces are generally laced in a criss‑cross or overlapping pattern") is coextensive with the objectives already announced in Sasaki (1976), Ries (1906), and US 4,670,949. When the inventor's stated problem is old and the proposed solution is a known hardware expedient applied in the known way, the claim is obvious. Graham, 383 U.S. at 17–18.

Ground C — Ries '872 alone (anticipation‑leaning, single reference)

If "loop member" is construed broadly as any closed or arched element rising off the shoe‑contacting face — which is the ordinary meaning of "loop" and is consistent with the sole disclosed species (round loops 215 affixed to a spring) — then Ries' curved guide‑tubes 12 on the tongue‑mounted securing portion 11 read on it. Ries' claim 3 recites "[a] lacing‑guide comprising a securing means, and a pair of oppositely‑disposed curved guide‑tubes carried thereby" and claim 4 "a lacing‑guide comprising a pair of joined oppositely‑disposed curved guide‑tubes" — i.e., closed arched conduits carried on the body, with the body's obverse face seated against the tongue. On that reading, claim 1 is anticipated under § 102(b) and claim 2 is obvious over Ries alone plus the admitted criss‑cross lacing environment.

Caveat: I flag this as construction‑dependent. A narrow construction of "loop member" (a grip ring, not a lace passage) defeats Ground C and leaves Ground A/B as the operative rejections.

Ground D — DE 329,580 (Balzer) as the loop‑member reference

Balzer's title on the '531 face is literally "Device for forming a lace loop for lace fasteners." If its disclosure is what its title implies — a device that forms/retains a loop in a lace — it would supply the "loop member" element directly from within the same cited art, converting Ground A into a two‑reference rejection using only face‑of‑patent art. I could not verify its content and therefore do not rely on it. I recommend pulling DE 329,580 from the DPMA/Espacenet image server before resting any rejection on it.

Ground E — the "spring/coil" and "beads" species (relevant only if the claims were narrowed)

Not needed for claims 1–2 as issued, but note for completeness: the specification affirmatively concedes that the spring form is commodity hardware ("a shielded spring, which can be found at some large hardware stores, will offer[] a more comfortable touch") and that beads on laces make "it takes less effort to grab and hold the lace by the beads than without them." These are admissions that the FIG. 1 and FIG. 16 species are routine selections.

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F. Graham factors and secondary considerations

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G. Where the patentee would fight, and the honest weaknesses in the § 103 case

1. The "loop member" is the only genuine hook. The claims' sole arguably novel element is the protruding loop. The brief is only ~5 pages and the drawings are schematic; the loop 215 in FIG. 21 is the only support. A patentee (or a defending party distinguishing the art) will argue "loop member" means a distinct lace‑gripping ring, and that neither Ries' guide‑tubes (which are lace passages) nor Nwoko '763's outer loop (an eyelet feature at the throat, not a member positioned between the edges) discloses it. Ground A answers this via Nwoko '763, but the combination requires the tribunal to accept that a loop added for grasping is an obvious design choice — which KSR and the patentee's own stated objects strongly support.
2. Claim 2's "separating … from frictional contact with one another" is harder than claim 1. No face‑of‑patent reference expressly performs that separation at a device positioned between the edges. Reaching it requires US 4,670,949 (or an equivalent), which is not on the '531 face. This is the strongest non‑obviousness argument for claim 2.
3. Reference‑verification gaps. I could not confirm the disclosures of seven of the ten cited references. If DE 329,580 or US 1,502,919 / US 1,862,047 discloses a loop at the throat, Grounds A/D collapse into a single‑ or two‑reference rejection; if none does, Ground A becomes the exclusive path for the loop element. This is the single largest uncertainty in this opinion.
4. Standard of proof. The issued claims carry a presumption of validity; a challenger must prove invalidity by clear and convincing evidence. [Microsoft Corp.](/litigations/by-plaintiff/Microsoft%20Corp.) v. i4i Ltd. P'ship, 564 U.S. 91 (2011). An examiner‑side rejection (preponderance) is easier than a court‑side invalidity holding.
5. Practical relevance is now defensive only. The patent expired 2000‑07‑16 for fee non‑payment (§ 41(b)/37 C.F.R. § 1.362), and the last possible infringement recovery window has long closed as of today (26 April 2026). Its remaining significance is (a) as § 102(b)/pre‑AIA art against the Boa/Nike/Burton/Ossur‑family closure claims that cite it (78 third‑party forward citations on the '531 page), and (b) for historical landscape work. Note that invalidity of '531 would not impair its effectiveness as § 102 prior art — what counts is the disclosure, not claim validity.

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H. Bottom line

Claim 1 is, in my assessment, at least strongly obvious and quite plausibly anticipated. The only recited element not clearly met by US 811,872 (Ries) is the "loop member," and that element is supplied by US 4,970,763 (Nwoko) — a § 102(b) reference in the identical field, with the identical stated purpose of easy lacing, and directly responsive to the patentee's own third stated object of "facilitat[ing] retainment of the lace." A Ries + Nwoko '763 rejection under pre‑AIA § 103(a) rests on the same "known technique, predictable result" rationale approved in KSR.

Claim 2 is obvious but requires one more reference. Sasaki '346 supplies the tube spanning the middle of the opening; Ries '872 supplies the friction‑reduction rationale and the between‑the‑edges positioning; US 4,670,949 (or, alternatively, a narrow reading of Nwoko '833's dual‑eyelet geometry) supplies the "separating the lace portions from contact with one another" function; Nwoko '763 supplies the loop. Claim 2's broader "support surface" language actually helps the challenger, since it covers non‑shoe cord‑spanning devices such as the examiner‑cited Gordon US 1,070,797 ("Fastening for ironing‑board covers and the like").

Confidence: High on elements (a)–(d) of claim 1 over Ries '872 (verified text). Moderate on the loop‑member resolution (construction‑dependent; no verified reference other than Nwoko '763, which is not on the patent's face). Low on DE 329,580 — I explicitly could not verify it, and given its title it should be the first document retrieved in any follow‑up. No secondary‑considerations evidence supports the claims, and the patent's lapse for non‑payment plus its complete litigation silence are consistent with a commercially marginal invention.