US 7175534

I'll verify this against live sources before summarizing.

Let me check the litigation history and any appellate activity.

Verification note

Searches for a Court of Appeals for the Federal Circuit docket in 2026 involving patent 7175534 returned no results, and a search for a Jimi IP / 7,175,534 appellate appeal likewise returned nothing. I therefore cannot confirm any CAFC 2026 activity for this patent — I am not going to infer that none exists; I simply found no authoritative record. What I did surface is a 2009 district-court case (below). Everything else here is grounded in the authoritative patent text supplied.

US 7,175,534 B2 — "Challenge course"

Maintenance-fee history (as recorded): 4th-year fee paid 2011-02-14 (with surcharge); lapse for non-payment 2015-02-13, then reinstatement after petition granted, patent reinstated 2016-11-14 (effective 2016-11-16); 8th-year fee paid 2016-11-16; 12th-year fee paid 2018-07-24.

Abstract (verbatim)

A challenge course (10) comprising a frame (20) having a substantially horizontally oriented track (120), a vertically oriented column (60) fixed to and extending downwardly from said substantially horizontally oriented track beam (30), said vertically oriented column (60) terminating in a bottom portion that is fixed to a substantially oriented foundation (40). The track (120) has a channel (150) therein in which a moveable member (360) slides. The track (120) has interchanges whereby the moveable member (360) can be moved in one of different directions. Descending downwardly from said moveable member (360) is a safety cable (350). The safety cable (350) extending downwardly to a safety harness (600). A further embodiment includes the challenge course (10) that can be deployed and re-deployed by hauling with a motor-vehicle. Further, a participant can be secured to the track (120) while still on the ground before ascending to the activity height.

Independent claims — plain language

The patent has 15 claims, of which two are independent: claim 1 and claim 14 (claim 1 is the broad apparatus claim; claim 14 is a narrower, "kitchen-sink" independent claim reciting essentially the full assembly).

Claim 1 — the core apparatus

A challenge course built from:

1. A frame with a substantially horizontally oriented track (120);
2. A vertically oriented member (60) fixed to and extending downwardly from that track, ending in a bottom portion (61) fixed to a substantially horizontally oriented foundation (40);
3. The track has a channel (150) sized to slideably receive a moveable member (360), and a track slot (140) through which a safety cable (350) passes, the cable descending from the moveable member;
4. A horizontally oriented platform (170) fixed to widthwisely opposed column bottom portions; and
5. A supporting element (300) fixed at both ends between two lengthwisely adjacent bottom portions.

In short: an elevated steel-tube frame with an overhead rail; a trolley slides inside the rail's channel and a lanyard drops through the rail's slot to the participant; platforms and challenge elements span between the columns below.

Claim 14 — the fully integrated course

A challenge course with a "cube-shaped frame (20) elevated away from the surface below," reciting cumulatively:

• substantially horizontal track (120) + vertically oriented member (60) + bottom portion (61) fixed to foundation (40);
• track channel (150) slideably receiving moveable member (360), with track slot (140) for safety cable (350) to pass downwardly;
• safety cable running down to a safety harness (600);
• track with lengthwise lanes (122) and widthwise lanes (124), all substantially in one horizontal plane;
• two opposed L-shaped members (130), each having a vertically oriented plate (132) descending from a rigid horizontal track beam (30) and a horizontally oriented plate (134) turned inward, defining the opening (140) between them and the channel (150) between the opposed members;
• a track slot (125) letting the moveable member be inserted/removed, plus a locking member (370) to prevent inadvertent removal;
• an exchange (126) allowing the moveable member to be directed along a choice of track directions;
• a horizontally oriented platform (170) on opposed column bottom portions, and an element (300) fixed between two lengthwisely adjacent bottom portions;
• an access means (220) for participants, hingedly connected to the frame;
• the functional "whereby" clause: the trolley slides freely in the channel, the cable slides freely through the opening yet is retained in the channel, and no load is caused on the track by a participant walking on the elements or platform.

Notable dependent claims

• 2 — frame disposed at an elevated height.
• 3 — the two-opposed-L-shaped-member rail geometry and free-sliding-but-retained cable result.
• 4 — cable extends down to a safety harness; 5 — participant's weight causes no tension in the cable.
• 6 — frame biasly disposed on a flat-bed trailer (500) so it can be driven to locations and raised/lowered.
• 7–8 — access means (220) hingedly connected so it remains attached during raising/lowering.
• 9 — track slot (125) + locking member (370). 10 — interchange (126). 11 — maximum cable slack about 12 inches. 12–13 — ascend/descend via biasing unit (400), specifically a scissors lift.
• 15 — trailer-mounted frame with hinged access means (note: claim 15 is written as depending from claim 12).

Litigation and portfolio context

• Only litigation surfaced: Ropes Courses, Inc. v. WhiteWater West Industries, Ltd., U.S. District Court for the District of Nevada, Case No. 2:2009-cv-02214, filed 2009-11-19, patent infringement (28 U.S.C. §1126 / federal question), judges Peggy A. Leen and James C. Mahan. A Darts-IP family-litigation link (family 36596723) is also flagged on the Google Patents record.
• Priority family: the CIP child US 11/649,065 → US 8,066,578 B2 (also titled "Challenge course"). Later family members include US 7,981,004, US 8,016,686, US 8,360,937, and the Jimi IP "zip track and system" line (US 10,213,699; US 11,376,513; US 12,296,277, etc.).
• Forward citations of note: US 2017/0173378 A1 → US 10,105,564 B2 (Ropes Courses, Inc., "Challenge course with return track"); US 2015/0319492 A1 (Horihan, "Redundant track and rail system"); FR 3040887 A1 (Croc' Aventure, "Acrobatic route support device"); US 2016/0319492; and Whitewater West's continuous belay / carriage system patents.
• Backward citations (9): US 2,365,117; US 3,270,441; US 3,563,539; US 4,737,107; US 5,468,199; US 5,667,461; US 5,885,189; US 6,443,849 (Playcore); US 6,666,773 (Richardson, downhill zip line). One non-patent citation: a Spectrum Sports product printout for "ROPE-A-PHOBIA®."

Uncertainties / literal-reading flags

Per the strict rule, I am not correcting these; reporting them as written:

1. Reference-numeral inconsistency between spec and claims. The specification's numeral list assigns 132 = L-shaped member horizontally oriented plate and 134 = L-shaped member vertically oriented plate. Claim 3 (and claim 14) say the reverse: "vertically oriented plate (132)" and "horizontally oriented plate (134)." I cannot resolve which is authoritative from the record alone.
2. "Track slot" numbering. Claim 1 recites "a track slot (140)" for the safety cable, while the specification describes 140 as the opening and 125 as the track slot. Claim 9 and claim 14 use both 125 and 140 with different functions.
3. Antecedent-basis wording. Claim 1 introduces "a vertically oriented member (60)" then refers to "said vertically oriented column (60)"; the same shift appears in claim 14.
4. Claim 14 typo — "substantiauy horizontally oriented track (120)" as written. Claim 14 also uses "exchange (126)" where claims 10/14 elsewhere use "interchange (126)." Note also claim 14 labels the L-shaped plate numerals (132)/(134) in the same swapped manner as claim 3.
5. Claim 15 dependency — written as "The challenge course (10) of claim 12," although its added limitations (flat-bed trailer, hinged access means) more naturally track claim 6/8 subject matter. I make no legal conclusion about validity or claim construction.
6. Status. Google Patents lists this as Expired – Lifetime with adjusted expiration 2025-02-24. USPTO/Patent Center would be the authoritative source to confirm current fee status and any post-2020 assignment chain; I did not retrieve a USPTO Patent Center page directly.
7. No CAFC 2026 docket was found. Treat that as "not found in my searches," not as confirmation of absence.

I'll research litigation involving US patent 7175534. Let me run several targeted searches.

Let me dig into the litigation specifically referenced on the patent page, plus broader searches.

Litigation involving U.S. Patent No. 7,175,534 ("Challenge course")

Bottom line: My searches surfaced only one litigation record tied to U.S. Patent No. 7,175,534 — a single U.S. District Court case in Nevada (D. Nev. case 2:09-cv-02214). I was not able to retrieve the case caption (party names), exact filing date, or disposition from the sources I could reach, so I am reporting the confirmed identifiers and explicitly flagging the gaps rather than filling them in.

1. Confirmed record: D. Nev. 2:09-cv-02214

The Google Patents page for US 7,175,534 carries a litigation notice reading "US case filed in Nevada District Court — https://portal.unifiedpatents.com/litigation/Nevada%20District%20Court/case/2%3A09-cv-02214", sourced to Unified Patents' litigation dataset. The same page also carries a Darts‑IP notice stating "First worldwide family litigation filed" for family ID 36596723, which is consistent with the Nevada case being the only litigation in this patent's family.

I attempted to open/confirm the Unified Patents portal entry and to search for the case caption directly; those queries returned no usable results, so I cannot responsibly name the parties or state the outcome. Contemporaneous context (which I offer as context, not as confirmed fact for this docket): the patent was assigned by inventor James Allen Liggett to Ropes Courses, Inc. of Allegan, Michigan, effective 2009‑11‑19 and recorded 2009‑12‑07 — i.e., shortly before/around this 2009 Nevada filing — and was later assigned to Jimi IP, LLC effective 2020‑04‑10. That timeline makes it plausible, but not verified, that a Ropes Courses entity was involved.

2. Litigation that does NOT involve this patent (checked and excluded)

The current owner, Jimi IP, LLC, and its predecessor Ropes Courses, Inc. have been active enforcers in the challenge‑course/zip‑line space, and the '534 patent shares an inventor and a family with those patents. Examples found in searching — none of which assert US 7,175,534:

• JiMi IP LLC v. Funcity Adventure Park LLC, No. 1:24-cv-05275 (N.D. Ill.). The complaint analysis shows assertions of US 11,376,513 ("Zip Track and System") and related '737 zip‑track family patents, over an accused "Ropes Course" and "Zipline" at an Algonquin, Illinois park. The '534 patent is not among the asserted patents described.
• Various continuation/continuation‑in‑part family members (e.g., US 8,066,578, US 8,360,937, US 7,981,004, US 8,016,686, and the later Ropes Courses/Jimi IP zip‑line patents) show up in citation lists, but citation relationships are not litigation.

I found no evidence of any other case — in any district, at the ITC, or at the CAFC — naming US 7,175,534.

3. Important limitations on this answer

• Verification gap. PACER/RECAP dockets and the Unified Patents litigation portal were not retrievable through my searches in this session. My statement that no other litigation exists is therefore "not found," not "confirmed absent."
• Expiry context. Per the patent record, the patent expired for fee purposes with an adjusted expiration date of 2025‑02‑24, so any assertion window on this patent closed on or about that date. Any case filed after that date would have to rest on damages for past infringement.
• What I would check next. CourtListener/RECAP (query by patent number 7,175,534 and by case no. 2:09-cv-02214), the D. Nev. docket via PACER, and the Unified Patents portal link above, to pull the caption, filing date, and disposition.

If you want, I can attempt a further round of targeted searches against a specific docket source to try to pin down the plaintiff/defendant and outcome in D. Nev. 2:09-cv-02214.

I'll verify the structured ODP signal against public sources before drafting.

AIA Trial Proceedings — US 7,175,534 ("Challenge course")

Bottom line up front: The structured PTAB/ODP block returns zero AIA trial proceedings for this patent, and my independent web checks did not surface any IPR, PGR, or CBM against it either. Every per-proceeding subsection requested below is therefore not applicable — I am not going to populate that template with invented numbers or outcomes. What follows is the absence analysis, the verification trail, and the (more important) non-PTAB defensive picture, which is unusually favorable to a defendant for other reasons.

Proceedings overview

Total AIA trial proceedings on file: 0 — no active proceedings, no claims invalidated, no claims sustained, no settlements, no institution denials, because no petition was ever filed (as far as the ODP record and public search indicate). Defensively, this is not the "hardened patent" signal; it is the "nobody bothered" signal — and here that is explained by the patent's own status: US 7,175,534 expired on 2025-02-24 and has been in an "Expired – Lifetime" state since. There is no PTAB-based defense to build because there is no live term to attack for prospective relief.

Verification trail (all searches run 2026-09-17):

• USPTO ODP structured block in this prompt: no AIA trial proceedings.
• Web search for US7175534 PTAB inter partes review → no result set returned.
• Web search for "7175534" IPR petition PTAB Ropes Courses → only patent-family and district-court material; no PTAB docket.
• Web search for "Ropes Courses" IPR PTAB petition → no Ropes Courses / JiMi IP AIA proceeding surfaced.

Caveats I will not paper over: (1) ODP ingest can lag; a very recently filed petition might not appear. (2) My search hits were limited, and I could not directly query the PTAB E2E docket or PATSTAT/Darts-IP family litigation entry (family=36596723) that Google Patents lists. If you need a belt-and-suspenders answer, run party-name searches on PTAB E2E for James Allen Liggett, Ropes Courses, Inc., and JiMi IP, LLC, and check the Darts-IP family litigation record directly. I found no evidence of a proceeding; I cannot affirmatively rule out one filed in the last ingest cycle.

Per-proceeding detail

None available. No proceeding numbers exist to report. Do not accept a "IPR2016-XXXXX on 7,175,534" citation from opposing counsel without a docket pull — I found none, and the patent's own prosecution/family history contains no adverse PTAB events.

Related, adjacent activity (not PTAB — read this before you rely on the zero)

The absence of PTAB activity is partly explained by timing and partly by the family's structure:

• Pre-AIA window. The '534 was asserted-era technology in 2009 (Google Patents lists a US case filed in Nevada District Court, docket 2:09-cv-02214, per the Unified Patents litigation portal; the source does not name the parties). IPR did not exist until 2012-09-16, and the pre-AIA inter partes reexamination vehicle appears unused. By the time AIA trials were available, the '534 was nearing the end of its life and the family's assertion weight had shifted to the continuation-in-part.
• The family — not the '534 — is what gets asserted. US 11/649,065 (filed 2007-01-03) issued as US 8,066,578 B2 ("Challenge course"), a CIP claiming priority to the '534. In JiMi IP, LLC v. Funcity Adventure Park, LLC, N.D. Ill. 1:24-cv-05275, JiMi IP and Ropes Courses, Inc. asserted US 10,478,737, US 8,066,578, and US 11,376,513 — the '534 was not among them. That case was dismissed without prejudice under a Rule 41(a)(1)(A)(ii) stipulation referencing a separate (confidential) agreement, with a 90-day conversion clause. Source: PatSnap litigation summary of PACER docket 1:24-cv-05275. I found no IPR against the '578 or '737 in my searches either, but I could not query PTAB E2E directly — treat that as unverified.
• Ownership chain (from the structured record): Individual (Liggett) → Ropes Courses, Inc., recorded 2009-12-07 (effective 2009-11-19) → JiMi IP, LLC, recorded 2020-05-13 (effective 2020-04-10). Current assignee of record: Jimi Ip LLC. Any demand letter today will come from JiMi IP, and it will almost certainly be aimed at the live portfolio members, not the '534.

Strategic summary

Claim status: UNTESTED (all 15 claims). No claim of the '534 has been canceled, confirmed, or construed by the PTAB. Claims 1–15 stand as issued. That sounds bad for a defendant, but it is close to irrelevant: the patent expired 2025-02-24, so there is no prospective infringement and no injunctive exposure. The only theoretically live theory is past damages for conduct within 35 U.S.C. § 286's six-year lookback measured from service of a complaint — which for any complaint filed on or after today reaches back only to roughly 2020-09-17, not to the patent's 2004 priority date and not before expiration. A troll that cites claims 1–15 of the '534 to you is citing an expired patent; check the expiration line before you do anything else.

A maintenance-fee lapse creates a real intervening-rights pocket. The legal events show the '534 lapsed for failure to pay maintenance fees effective 2015-02-13, then was reinstated after a petition and late payment, with reinstatement confirmed 2016-11-14 (FPAY 8th year, 2016-11-16). That is a ~21-month window during which the patent was not in force. Under 35 U.S.C. § 41(c)(2), parties who made substantial preparations to use the claimed invention during an unintentional lapse may have intervening rights against later enforcement. If your accused conduct (or your product line's design freeze, tooling, or marketing) traces into the 2015-02-13 → 2016-11-14 window, that is a defensible, non-PTAB, statutory argument — and it is the strongest documented defensive lever in this file.

Estoppel landscape: none, and that cuts your way. With zero IPRs, no petitioner is carrying § 315(e)(2) estoppel, and — more usefully — no prior art has been tested. Every ground remains open if you ever need it: the pre-AIA § 102/§ 103 art of record (US 2,365,117; US 3,270,441; US 3,563,539; US 4,737,107; US 5,468,199; US 5,667,461; US 5,885,189; US 6,443,849; US 6,666,773), the non-patent citation to the ROPE-A-PHOBIA product at spectrumsports.com (submitted to the examiner in the '578 family, dated 2004-03-08), and any art cited against the sibling CIPs. Nothing has been waived or consumed. Note that an expired patent can still be the subject of an IPR or ex parte reexamination, but the economics are poor for a defendant defending only a shrinking § 286 damages tail; a reissue/reexam-style validity attack is rarely worth the fee unless the asserted past-damages number is large.

Pattern signals: Same petitioner filing multiple IPRs on this patent — no, no petitioner at all. Patent owner pursuing PTAB appeals aggressively — no; the owner (Liggett → Ropes Courses → JiMi IP) has no PTAB-appeal history on this patent that I could find. Defensive aggregator in the chain — Unified Patents does not appear as a party; the only Unified-tagged entry in the structured data is the Northern District of Nevada litigation portal link for 2:09-cv-02214, which is a data source, not a party. The family's monetization pattern is direct district-court assertion by the operating company and its IP holding affiliate, not PTAB warfare — meaning you should expect a demand-letter / infringement-suit posture rather than a validity-trial posture.

Recommended next steps

1. Confirm expiration first. Any assertion of the '534 is an assertion of an expired patent (structured record: "Expired - Lifetime," adjusted expiration 2025-02-24). Demand the plaintiff's § 286 damages window and the specific pre-2025-02-24 conduct it is based on. If the letter asserts ongoing infringement, it is wrong as a matter of law.
2. Pull the maintenance-fee history for intervening rights. Events of record: REMI 2014-09-26; LAPS effective 2015-02-13; reinstatement after late fee confirmed 2016-11-14; FPAY 8th yr 2016-11-16. Document when your product/design/launch activity occurred relative to that gap. This is the § 41(c)(2) argument.
3. Do not file an IPR reflexively. No PTAB proceeding exists to piggyback on, and there is no live term to invalidate for prospective relief. If the past-damages demand is material, the cheaper routes are (a) intervening rights, (b) § 286 damages limitation, (c) invalidity as a litigation defense using the art of record, which is unconstrained because no § 315(e) estoppel attaches to any petitioner.
4. Redirect your diligence to the live family. The '534 is a dead-end; the exposure is US 8,066,578 B2 and the zip-track line (US 10,478,737; US 11,376,513), which are the patents actually being asserted by JiMi IP (see N.D. Ill. 1:24-cv-05275). The 90-day conversion clause in that dismissal means the JiMi IP / Funcity dispute could convert to a with-prejudice dismissal — or signal an ongoing enforcement program. Check PTAB E2E by party name (JiMi IP, LLC / Ropes Courses, Inc.) for AIA proceedings against those patents, since I could not verify that here.
5. If you want the zero independently confirmed (recommended given my search limits), search the USPTO PTAB E2E docket and the Darts-IP family litigation entry (https://patents.darts-ip.com/?family=36596723) yourself, and check CourtListener for any Federal Circuit appeal touching US 7,175,534. I found no appeal.

What I could not verify: whether the Nevada case 2:09-cv-02214 involved the '534 (the parties are not named in the source); whether any AIA proceeding exists against US 8,066,578 or the other family members; and whether the ODP ingest missed a very recent filing. I have not asserted facts on any of those points.

I'll start by confirming the authoritative record in the patent text, then cross-reference litigation and entity information.

I've gathered what I can. Note: the authoritative patent text gives me the reel/frame numbers and assignor/assignee for both recorded assignments, but it does not expose the correspondent-of-record fields; my follow-up searches on that field were not retrievable. I flag that explicitly below rather than guess.

Inventors

James Allen Liggett — sole named inventor of US 7,175,534 (all 15 claims; no joint inventors).

• Employer at filing: Liggett was the founder and principal of Ropes Courses, Inc. (est. 1989, Allegan, Michigan — the "Sky Trail®" high-ropes-course manufacturer, later rebranded RCI Adventure Products). RCI's own history confirms Liggett was building ropes courses through the 1980s–90s and founded the company in 1989.
• Unusual pattern: Despite being the principal of an operating company, Liggett filed this application personally — the patent issued 2007-02-13 with no assignee of record (Google Patents lists "Original Assignee: Individual"). He did not paper the company as owner until November 2009, ~5 years after filing. So the inventor did not "depart" the assignee; rather, he retained personal title for years.
• Contrast within the family: The continuation-in-part US 11/649,065 (US 8,066,578) names three inventors — Liggett, Troy Lee Garland, and Timothy Powers — and those three assigned to Ropes Courses, Inc. via reel 043826/0405 (effective 2010-09-15). That multi-inventor assignment does not cover US 7,175,534; only Liggett's personal assignment (reel 023620/0925) does.

Original assignee

None on the face of the issued patent. US 7,175,534 issued 2007-02-13 to James A. Liggett as an individual — there is no original corporate assignee. Google Patents records "Original Assignee: Individual."

The first corporate owner of record (and the entity that made and sold the product) is:

Ropes Courses, Inc. (Allegan, Michigan) — also known as RCI Adventure Products.

• Primary line of business: Design, manufacture, installation, and servicing of high-ropes/adventure attractions. Signature product Sky Trail® (a continuous-overhead-tracking ropes course), plus Sky Tykes®, the Sky Rail™ zip line, and later the Clip 'n Climb® climbing walls (North/South America) and Amaze'n Mazes™.
• Product embodying the claims: Yes. The claims recite a frame with an overhead track/channel, a sliding moveable member, a safety cable descending to a full-body harness, and interchanges — i.e., the Sky Trail continuous overhead tracking system. In the 2024 litigation the plaintiffs state they mark their products under 35 U.S.C. §287(a).
• Current status: Operating. Founded 1989; grew to ~350+ installations in ~25 countries; acquired Amaze'n Mazes (2017); took over WhiteWater West's dry-play lines (2019); still publishing installation content into 2025–2026. Third-party estimate ~$9.9M revenue / ~39 employees; a CARES-Act PPP loan of ~$1M in Apr 2020 is also noted in third-party profiles.

Assignment timeline

Two recorded assignments. Both reel/frame numbers are drawn from the authoritative Google Patents legal-events record (which mirrors the USPTO assignment database).

• 2009-11-19 (executed) / recorded 2009-12-07 — Reel 023620/0925

  • Conveyance: Assignment (ASSIGNMENT OF ASSIGNORS INTEREST)
  • Assignor: LIGGETT, JAMES ALLEN
  • Assignee: ROPES COURSES, INC. (Michigan)
  • Correspondent: Not available. The correspondent-of-record field is not exposed in the authoritative source I was given, and my follow-up retrieval did not return it. I will not invent a name. (Recurring litigation counsel for this family — FisherBroyles LLP, attorneys William F. Dolan, Patricia Y. Ho, Jeremy Sanders — is a separate role and is not evidence of assignment-recording conduct.)
  • Context: Standing-fixing / corporate consolidation. The founder assigned the individually-held patent to his own operating company, effective the very same day (2009-11-19) that Ropes Courses, Inc. filed Ropes Courses, Inc. v. WhiteWater West Industries, Ltd., D. Nev. 2:09-cv-02214 (filed 2009-11-19). Timing consistent with securing plaintiff-ownership before suit.

• 2020-04-10 (executed) / recorded 2020-05-13 — Reel 052654/0330

  • Conveyance: Assignment (ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ROPES COURSES, INC.)
  • Assignor: ROPES COURSES, INC.
  • Assignee: JIMI IP, LLC (Michigan)
  • Correspondent: Not available (same limitation as above).
  • Context: Intra-family transfer to an IP-holding affiliate. Title moved from the operating manufacturer to a Michigan LLC with an "IP" suffix; the operating company remains the licensee and co-plaintiff (see below).

Cross-reference (same family, different patents — not part of this chain): the sibling filings' transfers — e.g., reel 043826/0405 (Liggett/Garland/Powers → Ropes Courses, Inc.) on the CIP, and the same 052654/0330 reel used to move other family members to JIMI IP, LLC.

Corroborating enforcement record (family, not this patent):

• Ropes Courses, Inc. v. WhiteWater West Industries, Ltd., D. Nev. 2:09-cv-02214 (filed 2009-11-19).
• JiMi IP, LLC et al v. Funcity Adventure Park, LLC, N.D. Ill. 1:24-cv-05275 (filed 2024-06-24) — co-plaintiffs JiMi IP, LLC + Ropes Courses, Inc. ("RCI"); asserted US 8,066,578, US 10,478,737, US 11,376,513 (not US 7,175,534).
• JiMi IP, LLC et al v. WA7 Volli, W.D. Wash. 2:26-cv-03272 (filed 2026) — same two co-plaintiffs.

Maintenance-fee event (context for financial health): the patent lapsed for non-payment around 2015-02-13, then was reinstated 2016-11-14 on acceptance of a late maintenance fee (8th-year fee paid 2016-11-16). A near-abandonment episode by the then-owner.

Timeline diagram

timeline
    title Ownership of US 7175534
    2004 : Filed by James Allen Liggett
    2007 : Issued to Liggett as individual
    2009 : Assigned to Ropes Courses Inc
         : Nevada suit filed against WhiteWater West
    2015 : Maintenance fee lapse
    2016 : Patent reinstated after late fee
    2020 : Assigned to Jimi IP LLC
    2024 : Jimi IP and Ropes Courses sue Funcity

NPE / troll-pattern signals

1. Shell-entity transfer — present (qualified). Reel 052654/0330 (effective 2020-04-10) moves title from operating Ropes Courses, Inc. to JIMI IP, LLC, a Michigan LLC carrying the classic "IP" suffix, and the operating company continues as licensee. Mitigating facts: JIMI IP is plainly affiliated with the operating company, not an arm's-length acquirer — its name echoes founder "Jim" Liggett, it shares Michigan, and it litigates jointly with RCI as co-plaintiff (N.D. Ill. 1:24-cv-05275). This is a captive/affiliate IP-holder, not a disconnected shell.

2. Known asserter in the chain — unclear. JIMI IP, LLC is an active, repeat plaintiff (2024 Funcity; 2026 WA7 Volli), which is a frequency tell. However, it does not appear on any of the enumerated NPE lists (Acacia, Marathon, IV, Wi-LAN/Conversant, Pendrell, etc.), and I found no RPX/Unified Patents documentation classifying it as a high-frequency plaintiff. I therefore do not assert it is a listed asserter.

3. Repeat correspondent across the chain — unclear (insufficient data). The correspondent of record for both recordings (reels 023620/0925 and 052654/0330) was not retrievable, so I cannot establish repetition. Separately, litigation counsel FisherBroyles LLP (William F. Dolan; Patricia Y. Ho; Jeremy Sanders) recurs across the JIMI IP suits — but that is litigation representation, not assignment-recording conduct, and a single firm doing both NPE and operating-company work is not itself a finding.

4. Cascading transfers — not present. Only two assignments over ~16 years (2009 and 2020); no chain of LLCs moving title within 24 months, no shared-principal relay.

5. Pre-litigation transfer — present. Reel 023620/0925 was effective 2009-11-19, the same date Ropes Courses, Inc. filed D. Nev. 2:09-cv-02214 against WhiteWater West. The founder's assignment to the intended plaintiff took effect on the day of filing — the cleanest kind of standing-establishing transfer. Caveat: I could not confirm from the retrieved material that this specific patent ('534) was asserted in that Nevada action; the coincidence of dates is nonetheless on the record.

6. Bankruptcy fire-sale — not present. No Chapter 7/11 or judicial sale found for Liggett or Ropes Courses, Inc. The 2015 fee lapse was cured by reinstatement, not a court sale.

7. Privateering — unclear. The 2020 transfer does park the patent in an IP-only affiliate that asserts against competitor course operators, which resembles privateering. But the operating manufacturer co-plaintiffs and marks its products, so this reads as captive enforcement by the practising company, not classic third-party privateering.

8. Defensive aggregator — not present. The chain does not terminate at RPX, AST, LOT, Unified, or OIN; it terminates at an asserting affiliate.

Verdict

NPE — moderate confidence (captive / affiliate model).

The current assignee, JIMI IP, LLC, is a non-practising IP-holding entity per reel 052654/0330 (effective 2020-04-10), and the title moved out of the operating manufacturer that makes the Sky Trail® product. Combined with the standing-fixing assignment at reel 023620/0925 (effective 2009-11-19, the day Ropes Courses, Inc. filed D. Nev. 2:09-cv-02214), that is one strong plus one supporting signal — enough for "moderate," not for "high." I deliberately stop short of a high-confidence troll call: the transferee is a captive affiliate of a genuine operating manufacturer (Ropes Courses, Inc. / RCI Adventure Products, Allegan MI), the two entities sue together as co-plaintiffs (N.D. Ill. 1:24-cv-05275), and RCI states it marks practising products under §287(a) — facts inconsistent with an arm's-length patent-troll model. Caveat: US 7,175,534 itself was not among the patents asserted in the 2024/2026 suits (those were US 8,066,578 / 10,478,737 / 11,376,513), and the correspondent-of-record fields could not be retrieved, so signal 3 is unresolved.

Verify at: USPTO Assignment Center — https://assignmentcenter.uspto.gov/ (search "7175534"); alternate index: https://assignment.uspto.gov/patent/index.html. Litigation corroboration: https://dockets.justia.com/docket/illinois/ilndce/1:2024cv05275/[460601](/patent/460601) and https://dockets.justia.com/docket/nevada/nvdce/2:2009cv02214/70204.

I'll research US 7,175,534 and its cited prior art. Let me run several targeted searches.

Let me research the remaining cited references.

Prior Art Analysis — US 7,175,534 B2 ("Challenge course")

Important procedural note first: I attempted live lookups against USPTO/Google Patents/FreePatentsOnline for each cited reference and for the '534 patent itself. The authoritative full text of US 7,175,534 B2 was supplied to me and I treat it as controlling. Of the nine U.S. patent references the examiner cited, I was able to retrieve full or substantial text for only three (US 3,270,441; US 4,737,107; plus partial context for US 2,365,117). For the remaining six I have only the citation data embedded in the '534 patent's own "Patent Citations (9)" table (number, priority/filing date, grant date where shown, assignee, title). Where I lack the specification text I say so explicitly rather than guessing at disclosure content.

1. Identification of the patent under review

Because the application was filed 2004-12-21, pre-AIA 35 U.S.C. § 102 governs. All nine cited references issued well before that date, so each is at least § 102(b) art (and each also predates the invention, so § 102(a) art).

Independent claim elements to test against (claims 1 and 14):

• (a) frame with a substantially horizontally oriented track;
• (b) a vertically oriented column fixed to and extending downwardly from the track, terminating in a bottom portion fixed to a horizontally oriented foundation;
• (c) track having a channel slideably receiving a moveable member;
• (d) a track slot/opening receiving a safety cable that descends from the moveable member;
• (e) a platform fixed between widthwise-opposed column bottoms;
• (f) an element fixed at two ends between lengthwise-adjacent column bottoms;
• (claim 14 adds) lengthwise lanes + widthwise lanes, two opposed L-shaped members defining the channel and opening, a track slot (125) for inserting/removing the member, a locking member (370), an interchange/exchange (126), hinged access means (220), and the "no load on the track" functional limitation.

2. The nine cited U.S. patent references

(i) US 2,365,117 A — "Physical exercising or training"

• Citation: US 2,365,117 A; published 1944-12-12. The '534 patent's citation table lists no assignee. FreePatentsOnline's listing for the same number shows inventor "Stafford et al." and a classification of 482/37 — the two sources disagree on inventor data, and I do not auto-correct either. The title as printed in the patent text reads "Physical exercising ob training" (evidently an OCR artifact, but I am not correcting it).
• Description: I could not retrieve the specification. On its face and classification (exercise/obstacle apparatus), it is a mid-1940s physical-training structure — background art for an elevated structure that a person climbs/traverses.
• § 102 analysis: Does not anticipate any claim of the '534 patent. There is no disclosure (from what is available) of an overhead sliding track with a channel, a slideable member, a descending safety cable, or a platform/element bridging column bottoms. Relevant only as general § 103 background (elevated training structure).

(ii) US 3,270,441 A — "Reduced gravity simulator" (Donald E. Hewes)

• Citation: US 3,270,441 A; filed 1963-08-26; granted 1966-09-06. Inventor Donald E. Hewes (NASA). Confirmed via Google Patents and the NTRS record (Hewes & Spady).
• Description (verified from the specification): A cable-suspension system in which the test subject is supported by cables running to an overhead trolley unit mounted on a stationary overhead monorail track, which runs parallel to an inclined walkway. The trolley tracks the subject so the cable system stays directly above him; the subject wears a harness/sling arrangement (helmet, chest sling, hip sling, etc.), and the inclined walkway simulates reduced gravity.
• § 102 analysis: Does not anticipate claims 1 or 14, because it lacks (a) a challenge-course frame of vertically oriented columns terminating in a foundation, (e) a platform between widthwise-opposed column bottoms, (f) an element fixed between lengthwise-adjacent column bottoms, and the L-shaped-member/channel geometry. However, it is the single most on-point citation for the "overhead track + movable member + descending cable to a body harness" sub-combination — i.e., it is strong § 103 art that a skilled artisan would combine with an elevated course structure. It bears on the track/trolley/cable-to-harness aspects of claims 1(d) and 4, and on claim 5's "no load"/suspension concept generally. It does not anticipate any claim alone.

(iii) US 3,563,539 A — "Vertically adjustable exercising apparatus" (Clarence R. Rogers)

• Citation: US 3,563,539 A; filed 1968-03-14; granted 1971-02-16. Inventor Clarence R. Rogers. Title/dates confirmed by multiple forward citations (e.g., US 2,881,003; US 5,441,465; US 7,950,614). Classification ~482/37 (per the FPO listing).
• Description: From the title and classification only (specification not retrieved), a vertically adjustable exercise apparatus — i.e., a structure whose working height can be raised and lowered.
• § 102 analysis: Does not anticipate any claim. It has no sliding overhead track, channel, moveable member, or descending safety cable. Its only relevance is to the vertical-adjustability concepts of claims 12 and 13 (biasing unit / scissors lift) and possibly to claim 2 (elevated frame). Best characterized as § 103 art for the "ascend and descend" feature.

(iv) US 4,737,107 A — "Installation for the control of a gravitational or forced motion, notably for the simulation of parachute jumps" (Baudin-Chateauneuf; Bories & Gibert)

• Citation: US 4,737,107 A; FR priority 1985-07-17; filed 1986-07-08; granted 1988-04-12. Assignee Baudin-Chateauneuf (Sur-Loire, FR); inventors Jean-Louis Bories and Jean-Paul Gibert. Also published as EP 0 210 897 A1/B1, FR 2,584,998, CA 1,260,978.
• Description (verified from the specification and claims): An installation with a continuous (looped) rail running from a starting zone (a simulated aircraft-cockpit element elevated on a support structure and reached by a ladder) through an active descent zone, a horizontal zone, and a return branch. A mobile load-carrying support/carrier (6) moves freely along the rail; the operator attaches himself to the carrier with a harness (7). An assisting carrier on a parallel rail is winch-controlled by a programmed unit; switches/aiguillages (21, 22) route carriers between the jump line and return line; a motion sensor triggers the cycle.
• § 102 analysis: Does not anticipate claims 1 or 14 as a whole — it has no challenge-course frame, no platform between column bottoms, no element fixed between adjacent columns, and no L-shaped channel geometry. But it is, together with Hewes, the closest cited art on several discrete limitations, and it is the only cited reference that discloses an "interchange" that lets the moving support be directed along a choice of track directions — directly pertinent to claim 10 (interchange 126). It is also pertinent to: claim 1's "rail/mobile carrier + harness secured to the participant as the movement begins," claim 4 (harness), and claim 7 (access ladder to reach the elevated structure). It is best used in a § 103 combination, not as a § 102 anticipation.

(v) US 5,468,199 A — "Sliding-handgrip amusement apparatus" (Bigtoys, Inc.)

• Citation: US 5,468,199 A; filed 1993-12-17; granted 1995-11-21. Assignee Bigtoys, Inc.
• Description: I was unable to retrieve the specification. From the title and the amusement-playground context, it appears to be an overhead apparatus on which a user slides by handgrip — i.e., an overhead rail/beam with a slideable trolley or handgrip.
• § 102 analysis: On the available information, it does not anticipate claims 1 or 14. Its title suggests relevance to the track + slideable member concept (claim 1(c)) and the amusement/playground field, but without the specification I cannot assert it discloses a safety cable, L-shaped channel, foundation-mounted columns, or platforms/elements. Flagged as a § 103 reference on the sliding-overhead-member feature; stated with low confidence because I could not read the disclosure.

(vi) US 5,667,461 A — "Ambulatory traction assembly" (Raymond F. Hall)

• Citation: US 5,667,461 A; filed 1994-07-06; granted 1997-09-16. Inventor Hall, Raymond F.
• Description: Specification not retrieved. From the title, an ambulatory (walking) traction/support assembly — typically an overhead rail or frame carrying a movable carriage from which the patient is suspended by a cable/harness to partially support body weight while walking.
• § 102 analysis: On the available information, does not anticipate claims 1 or 14 (no challenge-course columns/foundation/platform/element structure). Its likely subject matter — overhead movable carriage with a cable descending to a body support — makes it § 103 art bearing on claim 1(c)–(d) and claim 4. Low confidence absent the full text.

(vii) US 5,885,189 A — "Balance beam" (American Sports International, Ltd.)

• Citation: US 5,885,189 A; filed 1997-10-31; granted 1999-03-23. Assignee American Sports International, Ltd.
• Description: Specification not retrieved. A balance beam — an elevated beam to be walked along.
• § 102 analysis: Does not anticipate claims 1 or 14. It is relevant only as background/§ 103 art to the "walk on elevated elements" concept and, at most, to the "element (300)" that a participant walks across (claim 1(f)); a balance beam is not fixed at two ends between lengthwise-adjacent column bottom portions within the claimed frame, nor does it include the track/channel/cable structure.

(viii) US 6,443,849 B1 — "Recreation system with rain forest theme" (Playcore, Inc.)

• Citation: US 6,443,849 B1; filed 2000-06-12; granted 2002-09-03. Assignee Playcore, Inc.
• Description: Specification not retrieved. A themed playground/recreation system.
• § 102 analysis: Does not anticipate claims 1 or 14 on the available information. It is cited as playground-structure background and, at most, § 103 art for an elevated multi-element play structure. It does not disclose the claimed overhead sliding safety-track architecture.

(ix) US 6,666,773 B1 — "Downhill zip line thrill ride system" (Michael Troy Richardson)

• Citation: US 6,666,773 B1; filed 2003-03-10; granted 2003-12-23. Inventor Michael Troy Richardson.
• Description: Specification not retrieved, but the title and field are clear: a zip-line thrill ride — an overhead cable/rail traversed by a rider suspended in a harness/trolley.
• § 102 analysis: Does not anticipate claims 1 or 14. It is the closest of the "ride" references to the overhead cable/trolley + suspended participant concept and is therefore § 103 art for claim 1(c)–(d) and claim 4; but a zip line lacks the fixed elevated frame with columns/foundation, the platform between opposed column bottoms, the element fixed between adjacent columns, and the L-shaped channel/interchange features. Note this same reference is itself cited in the later Liggett family patents (e.g., US 8,016,686), confirming it is treated as the generic cable-ride art.

3. Non-patent literature citation

• Citation as printed in the patent: "A product seen at www.spectrumsports.com, named the ROPE-A-PHOBIA(R), a 3 page printout is enclosed."
• Status: Cited by the examiner as the sole non-patent reference. A product, not a printed publication per se; as a commercial product it is § 102(a)/(b) art if it was on sale/publicly used before 2004-12-21.
• Description: I could not retrieve the printout. On the basis of the name and source (Spectrum Sports), it appears to be a ropes/challenge-course product — i.e., the most conceptually on-point of all the cited art, because it would disclose an actual challenge course with elevated elements and participant-belaying.
• § 102 analysis: Potentially the most relevant cited item for the overall "challenge course" concept, and potentially anticipatory of the broadest claim 1 if the printout showed a frame with a horizontal overhead track, a vertical support, a channel with a slideable member, a descending safety cable to a harness, and elements between supports. However, I cannot verify its disclosure, so I will not assert anticipation. It must be evaluated against the actual 3-page printout and any corresponding physical-product evidence.

4. Bottom line — what anticipates, and what only supports obviousness

Applying the strict § 102 test (a single reference must disclose every element of the claim as arranged), none of the nine cited U.S. references anticipates any claim of US 7,175,534 in its entirety. Each independent claim requires the combination of (i) an overhead sliding safety track with a channel/slot and moveable member, (ii) an elevated frame of vertical columns fixed to a foundation, (iii) a platform between widthwise-opposed column bottoms, and (iv) an element fixed between lengthwise-adjacent column bottoms. No single cited reference supplies all four.

Ranked relevance for the strongest § 103 combinations:

1. US 4,737,107 (Baudin-Chateauneuf) — rail + freely movable carrier + harness attachment at the start + elevated support reached by a ladder + switch/interchange routing → maps to claims 1(c)–(d), 4, 7, 10.
2. US 3,270,441 (Hewes) — overhead monorail + trolley + cables descending to a body harness/sling → maps to claims 1(c)–(d), 4, 5.
3. US 3,563,539 (Rogers) — vertical adjustability → maps to claims 2, 12, 13.
4. US 6,666,773 (Richardson) and US 5,468,199 (Bigtoys) — overhead slideable-member/cable ride art → claims 1(c)–(d), 4.
5. US 5,667,461 (Hall) — overhead movable carriage supporting a walking person → claims 1(c)–(d), 4.
6. US 2,365,117, US 5,885,189, US 6,443,849 — elevated exercise/play/balance background → claims 2, 1(f).
7. ROPE-A-PHOBIA (NPL) — potentially the closest to the overall challenge-course concept; disclosure unverified — do not treat as anticipatory without the printout.

Caveats I am obliged to state: (a) I was only able to read full text for US 3,270,441 and US 4,737,107; descriptions for US 5,468,199, US 5,667,461, US 5,885,189, US 6,443,849, US 6,666,773, US 3,563,539 and US 2,365,117 are inferred from title/classification and must be verified against the actual specifications before being relied on. (b) The citation table sources disagree on the inventor of US 2,365,117 (patent text shows none; FreePatentsOnline shows "Stafford et al."); I have not reconciled them and have not corrected either. (c) The '534 title as printed contains the OCR string "ob training" in the citation for US 2,365,117 — reproduced here without correction per the literal-identifier rule.

I'll analyze the obviousness of US 7,175,534 using the prior art references cited on the patent page. Let me first verify details about the key references.

Let me gather details on the remaining cited references.

Obviousness Analysis Under 35 U.S.C. § 103

US 7,175,534 B2 — "Challenge course" (Liggett; filed 2004‑12‑21; granted 2007‑02‑13)

Note on scope of sources. This analysis uses the references listed in the "Patent Citations" and "Non‑Patent Citations" sections of the US7175534 record (9 U.S. patents + 1 non‑patent product printout) as the prior‑art universe. Where I could not independently verify a reference's full disclosure, I say so rather than assume. Two later‑dated documents on the page (e.g., US8066578B2, the "continued‑in‑part" and the "Cited By" list) are not prior art to this patent and are disregarded for § 103 purposes.

1. Legal framework

Obviousness is judged under the four Graham v. John Deere Co., 383 U.S. 1 (1966) factors: (1) scope and content of the prior art; (2) differences between the prior art and the claims; (3) level of ordinary skill; and (4) secondary considerations. Under KSR Int'l Co. v. Teleflex Inc., 550 U.S. 398 (2007), the test is whether the claimed subject matter as a whole would have been obvious to a person having ordinary skill in the art ("POSITA"), and a combination is obvious where the prior art discloses all elements and the combination is "the predictable use of prior art elements according to their established functions." Motivation to combine need not be explicit — it can arise from the design incentives, market forces, and the "finite number of identified, predictable solutions" (MPEP §§ 2143, 2144.04). Knowledge of a problem in the field, and the design need stated in the patent itself, can supply the motivation.

Because the application was examined pre‑KSR (2004–2007), the examiner would have applied a stricter "teaching, suggestion or motivation" test; under KSR (current law), the same references support a materially stronger § 103 case.

2. Level of ordinary skill in the art (POSITA)

A POSITA here is best characterized as: a degreed mechanical or civil engineer (or equivalent practical experience) with roughly 2–4 years of experience designing amusement/playground/ropes‑course structures and overhead fall‑arrest or trolley systems; alternatively, an experienced ropes‑course designer/rigger with several years of hands‑on installation experience. The art is a mature, mechanical one (bolted tubular frames, overhead rail/trolley, harnesses, scissor‑lift trailers) in which these are "known techniques."

3. The prior art of record and what it teaches

4. Claim 1 — the independent base claim

Claim 1 requires, in substance: (a) a frame with a substantially horizontal track (120); (b) a vertical column (60) fixed to and descending from the track, terminating in a bottom portion (61) fixed to a horizontal foundation (40); (c) the track having a channel (150) that slidably receives a moveable member (360); (d) a slot (140) through which a safety cable (350) descends from the moveable member; (e) a platform (170) fixed between widthwisely‑opposed column bottom portions; and (f) a supporting element (300) fixed at two ends between two lengthwisely adjacent column bottom portions.

Primary § 103 combination for Claim 1: ROPE‑A‑PHOBIA + US5468199 + US4737107 + US6666773

• (a), (c) Overhead track with channel and slidable member: ROPE‑A‑PHOBIA expressly provides an "overhead safety puck / track system"; US5468199 independently shows an overhead rail with a slider whose channel slidably engages the rail and stops limiting travel.
• (b), (e), (f) Frame, columns, foundation, platform, and elements between adjacent columns: ROPE‑A‑PHOBIA mounts its elements between two walking platforms on legs (columns) above a base; US5468199 secures launch platforms and steps between upright poles. US6443849 and US5885189 show elevated themed platforms/balance elements between supports.
• (d) Safety cable descending from the moveable member through a slot to the user: US4737107 discloses a carrier on a rail to which the user attaches "by using a harness" and which "mov[es] freely on the rail"; US6666773 discloses a cable retained in a slit and a trolley locked against removal. The "slot" that passes a cable while retaining the slider is precisely the structure of US6666773's slit retainer.

Alternative § 103 combination: US5468199 + US4737107 + US6666773 + US5667461/US3270441. Here US5667461 and US3270441 supply the "harness suspended from an overhead traveler while the person is elevated" concept, US4737107 supplies the rail‑carrier‑harness arrangement secured before use, and US6666773 supplies the slotted‑retainer/quick‑engage/lock.

Motivation to combine (why a POSITA would do it):

1. Common field and common problem. All references address elevated structures with an overhead rail/beam and a person connected to a traveling member (amusement rails in US5468199; parachute/jump rail in US4737107; zip‑line cable in US6666773). They are "reasonably pertinent" to the problem the patent itself identifies.
2. Established functions preserved. Using a slider in an overhead channel as the traveling anchor for a safety lanyard is the predictable use of US5468199's slider and US4737107's carrier according to their known functions.
3. Market/design incentive. The patent's own Background recites the need for a course where "the participant is secured … before reaching the activity height" and for portability — needs expressly met by US4737107 (harness coupled at the start) and by the ROPE‑A‑PHOBIA trailer/lift. This satisfies KSR's "design incentive" rationale.
4. Finite, predictable solutions. Providing a cable‑passing slot plus an anti‑removal lock is a known, limited design choice (US6666773).

5. Dependent claims 2–13

6. Independent Claim 14

Claim 14 recites a "cube‑shaped frame" plus the track/channel/slot/harness combination, lengthwise lanes 122 and widthwise lanes 124 in one horizontal plane, the two opposed L‑shaped members, a track slot (125), a locking member (370), an "exchange" (126), a platform, an element between adjacent column bottoms, and a hinged access means, with the functional result that "no load is caused on the track … by a participant when walking."

Combination: ROPE‑A‑PHOBIA (track/puck, platforms/elements, harness, portability, multi‑lane element zone) + US5468199 (plural parallel/curved rails in a horizontal plane, sliders, stops) + US4737107 (harness‑on‑carrier secured before use; switches) + US6666773 (slotted retainer; engage/disengage; safety lock) + US3563539 (vertical adjustment). The "cube‑shaped" frame is a design choice (a rectangular prism of columns and beams; US5468199's parallelogram pole arrangement is analogous). The "no load on the track" clause is the same slack/fall‑arrest concept as claim 5 and follows from providing slack.

7. Claim 15

Claim 15 (depending from claim 12) recites the frame on a flat‑bed trailer + hinged access means + raise/lower with the access means attached + driving to locations. ROPE‑A‑PHOBIA Mobile supplies every element; the hinged attachment is an obvious expedient for a foldable access on a towable unit (motivated by the same portability need the patent recites). US3563539 supplies the raise/lower‑with‑structure concept.

8. KSR/MPEP rationales supporting the combinations

• (A) Known elements combined according to known methods, predictable results (MPEP 2144.04): overhead rail + slider (US5468199), harness‑carrier (US4737107), slotted locking trolley (US6666773), and liftable trailer (ROPE‑A‑PHOBIA/US3563539) each perform their known function without change.
• (C)/(D) Known technique to improve a similar device ready for improvement: mounting a challenge course on a scissor‑lift trailer (ROPE‑A‑PHOBIA) to gain portability is the known technique applied to an elevated rail structure.
• (E) Obvious to try with a finite number of predictable options: whether to make the safety connection a load‑bearing carriage or a slack fall‑arrest lanyard; whether to insert the puck through an end slot with a lock (US6666773) — a small, predictable set.
• (F) Design incentives / market forces: the patent's own stated needs (portability, throughput, pre‑ascent securing) supply the motivation, as KSR permits.

9. Counter‑considerations and candid caveats

1. Anticipation vs. obviousness. If the ROPE‑A‑PHOBIA printout establishes that the product was publicly known/used before the critical date (more than one year before 2004‑12‑21 for § 102(b)), Claim 1 (and much of claims 2–13) could be attacked as anticipated, not merely obvious. The printout's actual publication date is not evident from the page; the IDS merely shows it was submitted during prosecution. This date should be pinned down before relying on it.
2. Possible teaching away / different operating principle. US4737107 and US5667461/US3270441 are load‑bearing systems (the carrier supports the person). Applicant could argue they teach away from a slack, non‑load‑bearing fall arrest (claims 5, 11, 14). This argument is weakened because ROPE‑A‑PHOBIA (fall‑arrest with slack and auto‑belay) is in the same one‑field and expressly shows the slack configuration.
3. The L‑shaped channel geometry (claim 3) and the "cube‑shaped frame" (claim 14) are the most structural, least directly shown features. They are the best non‑obviousness candidates, but a slotted channel rail is standard overhead‑rail/curtain‑track geometry, and the cube frame is a design choice.
4. Claim drafting defects that affect construction (and thus any § 103 mapping): claim 1 recites a "track slot (140)" while the specification defines 140 = "opening" and 125 = "track slot"; claim 14 calls 126 an "exchange" (spec: "interchange") and repeatedly misspells "horizontally" as "substantiauy"/"substantially"; claim 7 says participants "descend upwardly" (evidently "ascend"). These inconsistencies (potential § 112 issues) make the claim scope ambiguous, which a challenger can exploit.
5. Secondary considerations. Assignee history (Ropes Courses, Inc. 2009; Jimi IP, LLC 2020) and the record's litigation entries (Nevada District Court, case 2:09‑cv‑02214; family litigation flag) suggest commercial activity. Any assertion of commercial success/non‑obviousness would require a nexus to the claimed subject matter; the claimed features largely track the ROPE‑A‑PHOBIA product, which cuts against nexus.
6. Unverified references. I could not fully re‑verify the specific disclosures of US2365117, US3270441, US5667461, US5885189, US6443849 within the tool limit; the table above reflects their titles/eras and should be confirmed against the documents before being relied on in a written opinion. (See the record's own citation list: https://patents.google.com/patent/US7175534/en.)

10. Bottom line

• Claim 1 would have been obvious over ROPE‑A‑PHOBIA + US5468199 + US4737107 + US6666773 (and, depending on the printout's date, arguably anticipated by ROPE‑A‑PHOBIA alone).
• Claims 2–13 are each supplied by the same combination (with US3563539 for the vertical‑adjustment claims 6/12/13 and ROPE‑A‑PHOBIA for the mobile/scissor‑lift claims), and are obvious.
• Claim 14 is obvious over the same combination plus the design‑choice "cube" frame; claim 15 is obvious over ROPE‑A‑PHOBIA Mobile + US3563539.
• A POSITA had strong, articulated motivations (same field; preserved element functions; the patent's own stated needs for portability, throughput, and securing participants before ascent; and a finite set of predictable design options), satisfying KSR even though the pre‑KSR examiner allowed the claims to issue.

Key URLs cited: ROPE‑A‑PHOBIA (https://spectrumsports.com/rope-a-phobia-mobile/, https://spectrumsports.com/rope-a-phobia-stationary/); US5468199 (https://www.freepatentsonline.com/[5468199](/patent/5468199).html); US4737107 (https://patents.google.com/patent/US4737107); US6666773 / US20040198502A1 (https://patentimages.storage.googleapis.com/47/b7/8c/d21ca4b2e1376d/US20040198502A1.pdf); US3563539 (https://patents.google.com/patent/US3563539A/en); patent record (https://patents.google.com/patent/US7175534/en).