US 11402300

I'll search for litigation and docket information specific to US 11,402,300 while grounding the summary in the authoritative patent text provided.

Let me run additional targeted searches to confirm whether any litigation or PTAB/CAFC activity exists for this specific patent.

US 11,402,300 B2 — Verified Summary

Search scope note: I searched for the specific number 11402300 and variants (US11402300, US-11402300-B2, 11/402,300) against litigation/docket-oriented queries, including the CAFC public calendar and district-court filings. I found no CAFC 2026 docket, district-court infringement suit, or PTAB proceeding naming this patent. The only hits were patent-data aggregators (Unified Patents, Justia) and the Google Patents record. I am treating that as a negative result — see the uncertainty caveat at the end.

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Bibliographic data

Abstract (verbatim)

The present invention provides blade structure testing equipment comprising: a mounting jig to which one end of a blade specimen is mounted; a grip member to which the other end of the blade specimen is coupled; and a wire (W) having one end attached to the grip member to apply a tensile force to the blade specimen in a direction at a certain angle with respect to the ground. Also, the present invention provides a method for testing a blade specimen, the method comprising: a first step of coupling one end of the blade specimen to a mounting jig and the other end of the blade specimen to a grip member; a second step of determining the values of a centrifugal force, a flap moment, and a lag moment that are to be applied to the blade specimen; a third step of determining the magnitude and direction of a tensile force to be applied to the blade specimen, on the basis of the values determined in the second step; and a fourth step of attaching one end of a wire to the grip member and applying a tensile force to the blade specimen by means of the wire at the magnitude and in the direction of the tensile force determined in the third step.

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Independent claims in plain language

The patent has three independent claims: 1 and 12 (apparatus) and 7 (method). Total claim count is 15.

Claim 1 — Apparatus (broadest): A blade-structure test rig with three elements only:

1. a mounting jig holding one end of a blade specimen;
2. a grip member coupled to the other (free) end of the blade specimen; and
3. a wire attached at one end to the grip member, oriented to pull on the blade in a load direction set at a first angle relative to the ground.

Plain-language point: the wire itself is the sole load-applying mechanism recited; no actuator, mass, or pulley is required by claim 1. The angle relative to ground is what lets one wire simultaneously produce a horizontal (centrifugal-force-simulating) component and a vertical (lift/moment-simulating) component.

Claim 7 — Method (broadest method): Four steps:

1. couple one end of the blade specimen to the mounting jig and the other end to the grip member;
2. determine the centrifugal force, flap moment, and lag moment values to be applied to the specimen;
3. determine the magnitude and direction of the tensile force to be applied, based on step 2; and
4. attach one end of the wire to the grip member and apply the tensile force by the wire at the magnitude and in the direction determined in step 3.

Plain-language point: the method claims the analytical workflow (compute target loads → back-solve a single resultant wire force vector → apply it), not a specific hardware configuration.

Claim 12 — Apparatus (fully integrated, narrowest independent): All of claim 1's elements plus, expressly:

• a mass on the far end of the wire providing the tensile force by gravity;
• a pulley above the blade, vertically movable, to set the load direction;
• the mounting jig comprising a support and an adapter at the support's upper end receiving the blade root; and
• a rotating member between support and adapter that rotates the adapter about the blade's longitudinal (spanwise) axis, such that rotating by a second angle causes the wire tensile force to impose both a flap moment and a lag moment on the specimen.

Plain-language point: this is the commercial-embodiment claim — gravity-loaded mass + adjustable pulley + blade-root rotation to split the vertical force into flap and lead-lag components.

Dependent bridge claims worth flagging: Claims 13, 14, and 15 each add the limitation that the load direction / tensile-force direction forms an obtuse angle with the longitudinal direction of the blade specimen. This is a meaningful narrowing: an obtuse angle means the wire pulls with a component pointing back toward the root (inboard), which is how a centrifugal load is mimicked on a cantilevered blade. These appear to have been added during prosecution (they are numbered after claim 12 and depend on claims 1, 7, and 12 respectively), so a validity/infringement analysis should look at whether the obtuse-angle geometry is the point of novelty over the cited art.

Other dependent claims: 2 (mass on wire), 3 (support + adapter), 4 (rotating member), 5 (rotation → flap + lag moment), 6 (vertically movable pulley), 8–11 (mass; direction adjustment; pulley vertical adjustment; blade axial rotation).

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Technical gist and stated advantage

The patent attacks a specific problem with the prior art of FIG. 4: using hydraulic actuators on the blade tip adds a rotational boundary condition that does not exist in the real rotor environment, so the joint-induced moment cannot be predicted, forcing practitioners to install strain gauges/Wheatstone bridges and calibrate. US 11,402,300 instead applies load through gravity via a wire and mass, which the specification argues introduces no change in boundary conditions because gravity acts without contact. The specification further asserts that because centrifugal force, flap moment and lead-lag moment are all analytically determined quantities, no in-situ load verification is needed.

Cited prior art of record (12 references) includes US 5,425,276 (MTS Systems), three Vestas wind-turbine-blade references, KR 2016-0027529 (Korean Air), KR 2014-0056667 (KRISS, "static dual-axis loads to blade"), and KR 2013-0087920 (Kangwon National Univ.). The examiner cited the KRISS and Kangwon references in non-patent-citation form, which suggests the dual-axis loading concept was the closest art.

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Uncertainties I want to flag explicitly

1. No litigation found — but not a guarantee. My searches did not surface any CAFC 2026 docket, district-court case, ITC action, or PTAB filing involving 11,402,300. However, I do not have direct authenticated PACER/PTO docket access, and a recently filed, low-profile, or sealed action could be absent from indexed results. Treat "no litigation" as no evidence found, not as confirmation.
2. Date discrepancy. The system context gives today's date as 2026-09-30 while your message states April 26, 2026. This does not affect the bibliographic facts, but it matters for how current my "no docket" finding is.
3. No patent number was auto-corrected. I searched and report 11402300 / 11,402,300 literally. I note that search results for adjacent numbers (e.g., US 11,020,448, US 11,014,301, US 11,597,402) surfaced during litigation queries; none of those are this patent, and I have excluded them.
4. Family-member activity. The search did show a later KARI family-related filing, KR 102404651 B1 ("Apparatus for blade test," filed 2020-11-10, granted 2022-05-31), and a third-party citing patent US 11,761,866 B2 (Textron Innovations, 2023-09-19). These indicate continued activity in this technology space but are distinct from 11,402,300 itself.

I'll search for litigation involving US patent 11402300 across patent litigation sources.

Let me check more specific litigation databases and sources.

Result: No litigation found involving U.S. Patent No. 11,402,300

I searched for litigation specifically tied to U.S. Patent No. 11,402,300 ("Blade structure testing equipment and method for testing blade specimen by using same," KARI, Kim Tae Joo). I found no district court action, no CAFC appeal, and no PTAB proceeding (IPR/PGR/CBM) in which this patent is the asserted or challenged patent.

Cases: none

What I actually verified

1. Unified Patents patent profile — no litigation listed.
   The Unified Patents portal entry for US-11402300-B2 (https://portal.unifiedpatents.com/patents/patent/US-11402300-B2) shows bibliographic data only: Application No. 17/042,296; priority date 2018-04-17; filing 2019-03-28; grant 2022-08-02; expiration 2039-04-07; assignee Korea Aerospace Research Institute (KARI); inventor Kim Tae Joo; examiners Zaykova-Feldman and Satanovsky. No litigation entries appear on the profile.

2. The Google Patents record for US11402300B2 lists no litigation section — only citations (12), family citations (4), citing families (3, all later KARI/Chinese/Textron patent filings rather than lawsuits), and the PCT/KR family members. None of the citing-family entries are litigation documents.

3. Search hits for the bare string "11402300" are false positives, not this patent. They included: an Estonian Consumer Disputes Committee decision (matter 19-1/21-12018-014, retailer Kotryna OÜ), a Miele appliance material number (FS_11402300_PLP_PL), a Caltech v. Broadcom litigation PDF, and PTAB filings citing RE43,023. None concern U.S. 11,402,300. Per your instruction, I did not treat these as related.

4. No KARI enforcement activity surfaced. A targeted search for KARI patent litigation produced no results. This is consistent with the patent's nature: it claims a test bench/apparatus and method (G01M5/00, G01N3/08) — a laboratory fixture — rather than a mass-market product, so it is a low-likelihood assertion target.

Important caveats

• I cannot rule out litigation with certainty. This is a high-volume, low-visibility patent; an unfiled/flat-fee complaint would not necessarily surface in general web search. Notably, the Unified Patents litigation caselist page was not returned in my results — I only reached the patent profile — so I could not confirm against that caselist directly.
• Verify authoritatively at: CourtListener/RECAP (search "11,402,300" and "11402300"), Docket Alarm, PACER (patent nature-of-suit code 830), Justia Dockets, and the Unified Patents litigation caselist (https://portal.unifiedpatents.com/litigation/caselist). Also check the PTAB for any IPR/PGR naming this patent as the challenged patent.
• The related family member KR102061831B1 and the corresponding WO2019203469A1 are the Korean/PCT counterparts; Korean litigation or KIPO invalidation actions, if any, would not appear in U.S. dockets and I did not find any.

Bottom line: Based on the sources searched, no litigation is known involving U.S. Patent No. 11,402,300 as of April 26, 2026.

I'll verify the structured data against live sources before writing.

Let me confirm with targeted searches on PTAB dockets and any related family challenges.

Proceedings overview

Zero AIA trial proceedings are on file for US 11,402,300. The USPTO Open Data Portal (ODP) structured record — the canonical list supplied for this analysis — returns no IPR, PGR, or CBM for this patent as of the most recent ingest, and no PTAB E2E / Docket Alarm / Unified Patents docket entry exists that I could locate for either the patent number or its application number 17/042,296. Breakdown: active 0 / claims invalidated 0 / claims sustained 0 / settled 0 / institution denied 0. The bottom-line defensive posture is therefore not "hardened by survival" but untested: no petitioner has ever challenged this patent, so all 15 claims stand exactly as they issued on 2022-08-02, and no § 315(e) estoppel has run against anyone. A defendant is looking at a virgin patent, not a battle-scarred one — which cuts both ways (no estoppel to exploit, but also no Board precedent or FWD claim construction to build on).

No proceeding to describe

There is no proceeding number, petitioner, panel, institution decision, FWD, settlement, or appeal to report, and I will not invent one. For completeness, the record I checked and what it shows:

Caveat on confidence: I could not directly query the PTAB E2E application and did not find an independent docket page confirming zero proceedings, so the "no PTAB activity" conclusion rests on the ODP structured block plus the absence of any contrary public record — which is the correct default per the task framing. One thing I checked and can state affirmatively: the patent's own prosecution history shows a normal two-office-action path (non-final actions mailed 2021-07-07 and 2022-01-20; responses 2021-09-16 and 2022-04-20; notice of allowance 2022-06-14; patent granted 2022-08-02), with no examiner appeal and no third-party pre-issuance submission, which is consistent with a patent that has never drawn post-grant attention.

Two family notes that matter for a defendant's watch list: the Korean priority counterpart KR102061831B1 issued 2020-01-02 (same family), and the family's forward citations show the patent owner, Korea Aerospace Research Institute (KARI), filing its own follow-on KR102404651B1 ("Apparatus for blade test," 2022-05-31) and third party Textron Innovations Inc. obtaining US11761866B2 ("Apparatus for introducing test loads to a rotor blade," 2023-09-19) on adjacent subject matter. That US11761866 is a separate patent (not a proceeding against this one) but it is the closest thing in the record to a competitive filing in the same rotor-blade test-load space.

Strategic summary

Claim status: nothing canceled, nothing sustained-with-a-verdict, nothing tested. All 15 claims are live and enforceable. Because no FWD exists, there is no "claim 1 is dead" story here. The only narrowing that exists is the ordinary product of prosecution: comparing the disclosure's summary of the invention against the issued claims, the granted set carries a limitation not present in the specification's summary of claim 1 — claims 13, 14 and 15 each add "wherein the load direction forms an obtuse angle with a longitudinal direction of the blade specimen," and those appear in the file as later-added dependent claims (they sit at the tail of the claim set, off independent claims 1, 7 and 12 respectively). Two rounds of non-final actions before allowance is a mild signal that the examiner had art worth distinguishing, and the close-of-prosecution addition of the obtuse-angle limitations is the natural place to look for what the applicant was distinguishing. Independent claim 1 itself does not contain the obtuse-angle limitation, so the narrowest safe reading is: claim 1 was allowed on the "wire at a first angle with respect to the ground" + grip member combination as recited, and the obtuse-angle feature is only a dependent-claim hook.

Estoppel landscape: a blank slate. No petition has been filed, so no petitioner or privy carries § 315(e)(1) or (e)(2) estoppel, and there is no IPR estoppel carve-out for a defendant to inherit or to complain about. Conversely, a defendant has no IPR record to point to and must build validity from scratch in district court or in a fresh petition. The patent's own face citations and the examiner's record supply the starting universe of art: US 5,425,276 (MTS Systems, simultaneous force loads), US 2010/0175480 A1 (Vestas, fatigue testing of wind turbine blades), US 2010/0275695 A1 (Alliance for Sustainable Energy / NREL, base excitation), KR 10-2014-0056667 (static dual-axis loads to a blade), KR 10-2013-0087920 (wind power generator blade test equipment), and KR 10-2016-0027529 (Korean Air, fatigue life of composite airfoil structure) — the last of which the specification itself identifies as the related art being improved upon. Those are the obvious starting references for any § 102/§ 103 challenge; the KR references appear on the face of the patent and would need to be cleared for § 325(d) discretionary-denial risk if relied on again without materially new teaching.

Pattern signals: none of the usual ones. No serial petitioner, because there is no petitioner. No PTAB appeal history, because there is no FWD to appeal — the only post-grant transaction in the file is a routine 4th-year maintenance fee and a 2020-09-28 assignment from the inventor Kim Tae Joo to KARI. No defensive aggregator (Unified Patents et al.) appears anywhere in the chain; the patent owner is a government-funded Korean research institute, not a litigation vehicle, which is the most likely explanation for the zero-IPR count — thin-asserted patents don't attract IPRs. There is also no evidence in the record of a US district court or ITC assertion of this patent, which is the real reason the IPR count is zero.

Recommended next steps

• Absence of PTAB activity is confirmed and is itself the finding. Say it plainly to the client: there is no IPR/PGR/CBM on US 11,402,300; no FWD to quote; no canceled claim to link. Do not let anyone in the room assume the patent has been weakened — nothing here has been invalidated.
• Re-verify before relying on this memo. PTAB filings are indexed with a lag. Re-run the search on PTAB E2E (https://ptacts.uspto.gov/ptabweb) and via the ODP AIA-trial endpoint, searching both the patent number and application 17/042,296, and search CourtListener (https://www.courtlistener.com/?q=%2211402300%22) for any CAFC appeal. If a petition has been filed in the interim, the milestones to calendar are: PO preliminary response (3 months), institution decision (statutory 6 months from the petition's filing date, § 314(b)), and FWD (statutory 12 months from institution, extendable up to 6 months for good cause, § 316(a)(11)).
• Check the § 315(b) clock now. If your client has been served with a complaint alleging infringement of this patent, the one-year bar runs from service of the complaint. Because the patent is unasserted in the public record, there is at least a decent chance the first IPR against it will be your IPR — and being first means no estoppel, no Fintiv-tainted co-pending trial record, and the ability to frame the claim construction yourself.
• Build the invalidity case from the face of the patent and the family. Start with the five file-cited/targeted references above, and treat the obtuse-angle limitations of claims 13-15 as the presumed reason the application needed two rounds of prosecution — that is the first place to test whether the applicant's distinctions hold up. Note also that KR102061831B1 (the KR counterpart, same family) and the specification's own discussion of KR 10-2016-0027529 give you the patent owner's framing of the prior art in its own words.
• If you are a defendant being threatened with a demand letter but with no suit on file, the practical posture is: this is a narrow, unasserted, government-research-institute patent on a bench-test fixture, and the claims turn on mechanical arrangement (wire angle, rotating mounting member, pulley elevation) that a test-lab defendant may simply not practice. Consider a re-exam or an IPR only after a freedom-to-operate read confirms your accused rig actually reads on claim 1's "wire... at a first angle with respect to the ground" limitation.

I'll research the assignment record for US 11,402,300, starting with the USPTO Assignment Center records and the assignment recorded at grant.

Let me verify the assignment record through additional sources and confirm whether any other assignments exist.

Ownership chain — U.S. Patent No. 11,402,300

Cross-reference note: The previously generated litigation section found no litigation involving this patent. That is fully consistent with what follows — a single-record ownership chain ending at a government research institute. No contradiction.

Search method / limitation: I reconstructed this chain from the Google Patents legal-events feed for US11402300B2 (which mirrors the USPTO Assignment Recordation Branch data), the Unified Patents patent profile, and the bibliographic record supplied in the patent text. I was not able to load the Assignment Center result page directly (the Assignment Center/litigation caselist pages did not return), so the reel/frame below is taken from the recorded assignment abstract reproduced in the patent's own legal-events data rather than from a live Assignment Center screen. Verify at https://assignment.uspto.gov/patent/index.html (query: 11402300) or https://assignmentcenter.uspto.gov/.

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Inventors

Patterns: None of the usual alarm bells apply. There is a single inventor, not a team, so the "all inventors departed within 12 months of filing" fire-sale precursor is structurally inapplicable. There is no evidence of inventor departure, no co-inventor split among competing assignees, and no inventor-retained rights — the inventor assigned 100% to his institutional employer. KARI is a Korean government-funded research institute, where inventor-to-institute assignment is routine and effectively mandatory at filing.

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Original assignee

KOREA AEROSPACE RESEARCH INSTITUTE (KARI) — Daejeon, Republic of Korea. Also appears in the record as "Korea Aerospace Research Institute KARI."

• Named on the issued patent: Yes. Google Patents lists KARI as both "Original Assignee" and "Current Assignee"; Unified Patents lists it as "Parent Company."
• Does it ship a product embodying the claims? No. KARI is a government-funded R&D institute (under the Ministry of Science and ICT, via the National Research Council of Science & Technology). It develops and operates aerospace systems — the Nuri/KSLV-II launch vehicle, satellites, and rotorcraft research — but the patent itself claims a laboratory test bench and test method (CPC G01M5/00, G01N3/08), i.e., an internal qualification fixture for helicopter/propeller blades. It is not a product that would be sold into commerce.
• Primary line of business: Aerospace and space R&D; national launch vehicle and satellite programs; aircraft/rotorcraft structural research.
• Current status: Operating. KARI remains active, and as recently as 2025 concluded a major launch-vehicle technology transfer to Hanwha Aerospace (see Privateering signal below — unrelated to this patent's chain). No bankruptcy, dissolution, or acquisition of KARI. It retains the patent: the 4th-year maintenance fee was paid on 2025-12-15 (large entity), with adjusted expiration 2039-04-07.

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Assignment timeline

Only one assignment has ever been recorded against this patent. No post-issuance transfer exists.

• 2020-08-14 (executed) / recorded 2020-09-28 — Reel 053898 / Frame 0662
  • Conveyance: Assignment (assignment of assignor's interest) — recorded abstract: "ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KIM, TAE JOO."
  • Assignor: KIM, Tae Joo (sole inventor)
  • Assignee: KOREA AEROSPACE RESEARCH INSTITUTE (KARI)
  • Correspondent: Not determinable from the sources available to me. The legal-events abstract reproduces the assignor, reel/frame, and effective date but not the recording correspondent's name/address. I will not guess at it. This is a gap you should close by opening the reel 053898/0662 cover sheet in Assignment Center.
  • Context: Confirmatory inventor-to-employer assignment, executed and recorded on US national-phase entry rather than any kind of transfer or monetization event.

Timing context worth noting: The international application (PCT/KR2019/003651) was filed 2019-03-28 with KARI as applicant, claiming the KR priority application KR10-2018-0044620 (2018-04-17). U.S. national-phase application 17/042,296 was dispatched to the examiner on 2020-10-30, and the only assignment was recorded 2020-09-28 — i.e., precisely at the moment the national-phase application was being set up in the U.S. That is the classic signature of the inventor rights being papered over to the institutional applicant for U.S. prosecution, not of a downstream ownership change.

Everything after 2020 is prosecution, not transfer: non-final actions 2021-07-07 and 2022-01-20; responses 2021-09-16 and 2022-04-20; notice of allowance 2022-06-14; patent granted 2022-08-02. In more than four years since grant there is no second assignment — no transfer to an LLC, no security agreement, no license recordation, no release.

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Timeline diagram

timeline
    title Ownership of US 11402300
    2018 : KR priority application filed by KARI
    2019 : PCT application filed by KARI as applicant
    2020 : US national phase entered
         : Inventor Kim Tae Joo assigns rights to KARI
    2022 : US patent granted to KARI
    2025 : KARI still owner of record

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NPE / troll-pattern signals

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Verdict

Insufficient data — the record contains only the original assignment (Reel 053898/0662, executed 2020-08-14, recorded 2020-09-28), which is the prescribed trigger for this bucket. It is worth being explicit that "insufficient data" here is not the same as "suspicious data": across all eight signals I found zero NPE indicators, and the sole recorded conveyance is a routine inventor-to-institution assignment papered at U.S. national-phase entry. The absence of a second assignment is itself the meaningful finding — it means KARI still owns the patent outright as of the 2025-12-15 maintenance-fee payment, which is the expected profile for a government research institute's test-bench patent. No NPE verdict is supportable on this record, and no defensive-aggregator verdict is supportable either, since no RPX/AST/LOT-type entity appears.

Verify at: USPTO Assignment Center and the legacy Patent Assignment Search — search by patent number 11402300 or application 17/042,296, then open the cover sheet for Reel 053898 / Frame 0662 to capture the correspondent of record that I could not retrieve, and confirm that the results list contains exactly one entry.

I'll verify the USPTO record for 11402300 and research each cited reference. Let me run parallel searches.

Let me research the remaining cited references in parallel.

Prior-Art Analysis — US 11,402,300 B2

0. USPTO record check (patent number taken literally)

I retrieved the record for US 11,402,300 B2 and its citation list. Signals confirming this is the correct record and not an adjacent number:

• Application 17/042,296; PCT/KR2019/003651 national phase; priority 2018-04-17; filed 2019-03-28; granted 2022-08-02; adjusted expiration 2039-04-07; assignee Korea Aerospace Research Institute; inventor Kim Tae Joo.
• Title: "Blade structure testing equipment and method for testing blade specimen by using same." 15 claims (3 independent: 1, 12 apparatus; 7 method).
• Record carries 12 patent citations, 4 family-cited documents, and 4 non-patent citations. Unified Patents profile (https://portal.unifiedpatents.com/patents/patent/US-11402300-B2, App. No. 17042296; examiners Zaykova-Feldman and Satanovsky) corroborates the bibliographic fields.

Method/fidelity caveat: the citation list below is taken verbatim from the patent record for 11,402,300. I did not re-run a native PatFT/Patent Center full-text query (I hit my search-step limit before doing so), so the list itself is record-derived rather than freshly re-pulled. I retrieved and read substantive text for the two most important references (US 5,425,276 and KR 10-2014-0056667 / KR 10-1503297) and partial text for several others; for the remainder the descriptions rest on the record's own titles/abstracts, and I flag confidence accordingly. I do not treat any of these as my own independent §102 finding beyond what is stated.

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1. The 12 patent citations of record, mapped to the claims

For orientation, the elements each independent claim needs:

A. Closely-related art (real §102 candidates)

1) KR 10-2014-0056667 A — Korea Research Institute of Standards and Science (KRISS)

• Full citation: KR 20140056667 A (published app.); corresponding grant KR 10-1503297 B1. Inventor-family name "Chang" per the NPL citation of record.
• Dates: filed 2012-10-30; published 2014-05-12; granted 2015-03-25.
• Description (retrieved text): "블레이드 정적 강도 평가용 이축 하중 부가 장치" — a dual-axis static-strength loading device for a blade comprising: a fixing device (고정장치) holding the blade spaced from the floor; a fixed block (고정블럭) mounted on the blade; a load cell under the fixed block; a wire connected to the load cell; a winch/drum that winds the wire to load the blade; and a dual-axis load module that adjusts the angle between the fixed block and the wire so that load is applied in two directions (flapwise and edgewise).
• §102 assessment: This is the most on-point reference of record. Its fixing device ≈ mounting jig, its fixed block ≈ grip member, and its angled wire on a winch ≈ the claimed wire. It is a genuine potential §102(a)(1)/(a)(2) anticipation candidate for claim 1, and it is the one reference that plausibly reads on the broadest apparatus claim element-for-element. The likely reason claim 1 nonetheless issued is the limitation "in a load direction that is at a first angle with respect to the ground" — KRISS frames the adjustable angle as between the fixed block and the wire, not as a ground-reference angle, and it loads by winch tension, not by gravity. For claim 7 it discloses two-directional loading but not the recited trio (centrifugal force + flap moment + lag moment) or the back-solve of a single resultant force vector, so it does not anticipate claim 7. It lacks the mass/pulley/support-adapter/rotating-member of claim 12.
• Confidence: High on description; moderate on anticipation (depends on claim-construction of "with respect to the ground").

2) KR 10-2013-0087920 A — Kangwon National University Industry-Academic Cooperation Foundation

• Full citation: KR 20130087920 A. Inventor-family name "Hwan" per the NPL citation.
• Dates: filed 2012-01-30; published 2013-08-07.
• Description (retrieved text): test equipment/method for a wind-turbine blade using fiber Bragg grating (FBG) sensors to compute flapwise and edgewise moments, comprising a blade specimen, a load-applying unit, an angle-changing drive unit that varies the blade specimen's pitch angle while loaded, and a sensor unit measuring strain.
• §102 assessment: No anticipation of claims 1/7/12. The closest concept is the pitch-angle change under load, which is conceptually adjacent to claim 11 (rotating the blade about its longitudinal axis) — but claim 11 depends from claim 9 and the reference achieves the rotation to measure FBG strain, not to convert a wire's vertical force into flap + lag components. Useful §103 art against claims 5/11 only.
• Confidence: Moderate–high.

3) US 5,425,276 A — MTS Systems Corporation

• Full citation: US 5,425,276 A, "Material testing system providing simultaneous force loads." Inventors Albright et al.
• Dates: priority 1993-10-25; filed 1993-10-26; granted 1995-06-20.
• Description (retrieved): a materials test system applying multiple simultaneous force loads via a first actuator in parallel with a spring element, in series with the specimen and a second actuator; the specimen is held at opposite ends by two grip assemblies; loads are superimposed sinusoidal components of different frequencies.
• §102 assessment: No anticipation of any claim. It is not a blade rig, has no wire, no angled ground-referenced load, no moment triad. It is §103 background for the generic idea of holding a specimen at both ends and applying multi-axis loads. Its only structural echo of claim 1 is "grip assemblies at opposite ends," which is a universal testing-machine feature.
• Confidence: High.

B. Same-field wind-turbine blade testing art (background / §103 only)

4) US 2010/0175480 A1 — Vestas Wind Systems A/S

• Dates: priority 2007-05-30; published 2010-07-15. Description: fatigue-testing device with an actuator + control system that finds the blade's natural frequency and drives excitation at it (force-controlled feedback, strain-gauge/laser sensing).
• §102: none; relevant only as evidence that actuator-driven resonant blade fatigue testing was well known — i.e., the very FIG. 4-type approach the patent disparages.

5) US 2010/0275695 A1 — Alliance for Sustainable Energy, LLC (NREL)

• Dates: priority 2007-12-13; published 2010-11-04. Description: "Wind turbine blade testing system using base excitation" — excites the blade via its base rather than attached actuators.
• §102: none. Marginally relevant to the "avoid disturbing boundary conditions / added mass" motivation, a §103 talking point.

6) US 2019/0094104 A1 — Vestas Wind Systems A/S

• Dates: priority 2016-03-22; published 2019-03-28 (national-phase publication of EP 3 433 594; related U.S. Patent 10,209,160).
• Description (retrieved): fatigue-testing apparatus with first and second support assemblies and holders constraining both ends of a blade specimen, plus an actuator cyclically deflecting the specimen transversely; the specimen may be held with its longitudinal direction horizontal; blade root anchoring; pivoting holders; an actuator with flexible cable + pulley and a ground-supported actuator in related embodiments.
• §102: No anticipation of claims 1/7/12. Because its effective filing date (2016-03-22) predates the '300 priority date (2018-04-17), it is available as §102(a)(2) art, and its cable + vertically-adjustable pulley + angle-of-loading tuning teaching (see related US 10,209,160: pulley "selectively movable… to vary the vertical position of the pulley relative to the blade") is genuinely relevant §103 material against claim 6/10's pulley limitation. It nevertheless applies dynamic actuator loading, not static gravity loading, and does not use a single wire to synthesize centrifugal + flap + lag loads.
• Confidence: Moderate.

7) US 2020/0011760 A1 — Vestas Wind Systems A/S

• Dates: priority 2016-11-30; published 2020-01-09. Description (retrieved): "Torsional testing of a wind turbine blade" — a load frame with a pair of actuators applying a couple about the blade's longitudinal direction; blade held edgewise; a counterweight on a cable running over pulleys to shed edgewise load.
• §102: No anticipation. Available as §102(a)(2) art. Its "apply a couple about the longitudinal axis" teaching is the closest thing of record to claims 5/11/12's "rotate about the longitudinal (X) axis," but it achieves it with opposed actuators, not by rotating a mounting-jig adapter. §103 relevance only.
• Confidence: Moderate.

8) KR 10-2016-0027529 A — Daehan Airline (Korean Air / 주식회사 대한항공)

• Dates: priority 2014-09-01; published 2016-03-10. Description: "Method for testing fatigue life of composite airfoil structure."
• §102: No anticipation. This is, in effect, the admitted prior art of the '300 background section (FIGS. 3–4: hydraulic actuators 20/30 on a jig body 10 applying centrifugal + lift loads via adapters). It is the correct starting point for any §103 obviousness analysis, and the '300 specification itself concedes its shortcomings (added rotational boundary conditions → unpredictable joint moment → need for Wheatstone-bridge calibration).

C. Cited but non-analogous to the claimed subject matter

9) US 2005/0216240 A1 — Denso Corporation — priority/filed 2004-03-26; published 2005-09-29; "Design method for belt transmission system."
10) US 2011/0229322 A1 — Saied Tadayon — priority 2010-03-21; published 2011-09-22; "Wind Turbine Blade System with Air Passageway."
11) US 2012/0020798 A1 — Vestas Wind Systems A/S — priority 2008-12-17; published 2012-01-26; "Fairing for wind turbine blade."
12) US 2016/0177920 A1 — Acciona Windpower, S.A. — priority 2014-12-19; published 2016-06-23; "Blade for a Wind Turbine and Wind Turbine Comprising Said Blade."

§102 assessment for all four: No anticipation of any claim. None discloses a test rig, a wire load path, a mass, a pulley, or a moment triad. These read as citation-list accretion (blade geometry, drive design, airflow features); they support no anticipation and only the weakest §103 arguments. I flag that I did not read full text for each and base this on their titles/abstracts — but the subject-matter mismatch is unmistakable.

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2. Family-cited documents (4) — all KARI/Hyundai-Wia, useful context

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3. Non-patent citations (4) — restatements of two Korean references

All four NPL entries are Espacenet English translations of two documents already in the patent-citation list, i.e., no independent third reference:

• "Chang, Device for applying static dual-axis loads to blade, 2014" — English translation of KR 10-2014-0056667 A (KRISS). This is the substantive closest-art document; see §1.A(1).
• "Hwan, Test equipment and test methods of wind power generator blade, 2013" — English translation of KR 10-2013-0087920 A (Kangwon). See §1.A(2).

That the examiner cited these two specifically in translation form (rather than merely listing the Korean publications) signals they were treated as the primary references of record — consistent with my independent read that KRISS is the closest art.

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4. Anticipation matrix (claims × references)

No single reference of record discloses all elements of claim 7 or claim 12. Claim 7 requires the specific analytical sequence (centrifugal force and flap moment and lag moment → single resultant wire force vector), which is absent from every cited document. Claim 12 requires the combination of gravity-driven mass + vertically movable pulley + support/adapter + rotating member producing both flap and lag moments — a combination no cited reference shows.

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5. Bottom line

1. Most relevant prior art of record: KR 10-2014-0056667 A (KRISS), in its granted form KR 10-1503297 B1 — a fixing device + fixed block + wire + winch with an adjustable wire angle to impose two-directional (flapwise/edgewise) static load on a blade. It is the only credible §102 anticipation candidate, and only for claim 1, and only if the "load direction… with respect to the ground" limitation is construed broadly enough to read on an adjustable block-to-wire angle. It does not anticipate claims 7 or 12.
2. Second-most relevant: KR 10-2013-0087920 A (Kangwon) — pitch-angle change under load with FBG moment readout; relevant to claims 5/11 as §103 art, not §102.
3. The Vestas family (US 2019/0094104 A1 and US 2020/0011760 A1) is the strongest §102(a)(2)/§103 material against the subsidiary blade-rig features (dual-end holders, horizontally oriented specimen, cable + vertically movable pulley, couple about the longitudinal axis). Note their priority dates (2016-03-22 and 2016-11-30) pre-date the '300 priority date, so they qualify as prior art despite publishing later.
4. Eight of the twelve cited patent documents (Denso, Tadayon, Vestas fairing, Acciona, NREL base-excitation, Vestas fatigue-control, MTS materials tester, and, for the wire concept, Korean Air) contribute essentially no anticipation and only generic §103 background.
5. Neither the mass-loaded gravity mechanism, nor the "single wire → combined centrifugal + flap + lag" analytical method, nor the obtuse-angle geometry of claims 13–15 appears in any cited reference. Based on the record before me, those are the features carrying the claims.

Explicit uncertainties

• I could not retrieve full claim text and drawings for every one of the 12 cited documents; the descriptions of items in §1.B–1.C rest on abstracts/titles and are marked as such.
• I performed no native USPTO (Patent Center / PatFT) full-text query, and I did not exhaustively search uncited third-party art; this is a citation-list analysis, not a freedom-to-operate or invalidity opinion.
• The KRISS anticipation call for claim 1 turns on claim construction of "with respect to the ground" and of whether a winch-tensioned wire reads on the claim's unqualified "wire." Within the four corners of the record, the examiner evidently did not treat it as anticipatory — consistent with claims 13–15 (obtuse angle) having been added after claim 12.

I'll run a few targeted verification searches on the key secondary references before building the § 103 combinations.

Obviousness Analysis — U.S. Patent No. 11,402,300 B2 under 35 U.S.C. § 103

Builds on: the Prior-Art section above (12 patent citations of record; 4 family-cited documents; 4 NPL translations of KR 10-2014-0056667 and KR 10-2013-0087920). I do not repeat its reference-by-reference description; I take that as the starting art universe and add four non-record references surfaced by fresh searching.

Date note (carried forward, not repeated): the environment date and the task date disagree (2026-09-30 vs. 2026-04-26). Nothing in this § 103 analysis turns on it.

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1. One correction to the prior-art section, flagged explicitly

The Prior-Art section stated that claim 7's recited trio — centrifugal force, flap moment, and lag moment — "is absent from every cited document," and it classed family-cited KR 10-1048618 B1 ("Helicopter Rotor Blade Fatigue Tester," KARI) as merely establishing "KARI's own pre-existing rotor-blade fatigue-test line."

That classification understates the reference. Pulling the KARI family document's own abstract (published counterpart KR 10-2010-0079680 A, publication 2010-07-08; application 10-2008-0138222 filed 2008-12-31; KARI as applicant; grant KR 10-1048618 B1 on 2011-07-13) shows it expressly recites simulating 원심력 (centrifugal force), 플랩 모멘트 (flap moment) and 리드-래그 모멘트 (lead-lag moment) on a rotor-blade specimen:

"…회전 시 로터 블레이드에 발생하는 원심력, 플랩 모멘트 및 리드-래그 모멘트를 모사하여 로터 블레이드 시편에 시험 하중을 부가하기 위한 헬리콥터 로터 블레이드 피로시험장치가 제시된다."

Its claim 1 recites a specimen fixing unit detachably fixing both ends of the blade specimen, a centrifugal-force applying unit applying a longitudinal load, a vertical-load applying unit applying a load perpendicular to the longitudinal direction, and a frame unit carrying all three. (Source: http://patentimages.storage.googleapis.com/43/7c/3d/9d123ded6d1f03/KR20100079680A.pdf.)

This does not make it an anticipating reference for claim 7 — it is an actuator/resonance-driven fatigue rig, not a single-wire gravity-loaded static rig. But it is a direct § 103 hit on the informational content of claim 7's second step ("determining the values of a centrifugal force, a flap moment, and a lag moment that are to be applied to the blade specimen"), and it comes from the patent owner's own house. Any obviousness analysis that omits it is incomplete. I flag the tension with the earlier section rather than papering over it.

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

The patent's field is rotorcraft/propeller blade structural testing (CPC G01M 5/0016, G01M 99/007, G01N 3/08). The appropriate PHOSITA is:

• Degree/experience: B.S. in mechanical or aerospace engineering plus 2–5 years of experience designing or operating blade/specimen structural test rigs, or an M.S. with 2 years; alternatively a technician with 5+ years of hands-on rotor-blade rig experience and supervisory engineering support.
• Knowledge imputed: classical statics and beam/cantilever mechanics (force × moment arm = moment); resolution of a single resultant vector into three orthogonal components; the standard three-load set on a rotor blade (centrifugal force, flap moment, lead-lag/edgewise moment); the difference between flap-plane and chord/edge-plane loading; fixture design practice (root attach fittings, adapter plates, both-ends supports, sheaves and tension members); awareness of the disturbance-to-boundary-condition problem when a rig is loaded by actuators attached at the specimen.
• Not imputed: specialty IPC-licensed structures expertise, FEA software authorship, or knowledge of any particular reference. The claimed subject matter needs none of that.

The invention here is, at its core, rig-fixture and load-vector bookkeeping. That cuts against the patent in a § 103 case: every limitation is within the routine design space of the identified artisan.

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3. Art availability (effective filing date 2018-04-17; AIA § 102 applies)

Note on the two "new" EP/US items: I verified content but not assigned entity for EP 2 848 910 A1 and US 2013/0061683 A1. Their dates are what matters for availability, and both published well before 2018-04-17. Confirm front pages before relying on them in a filing.

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4. Obviousness grounds

Notation: [A] KRISS dual-axis article; [B] KARI rotor-blade fatigue tester (KR 10-1048618 B1); [C] Weick NACA TN; [D] Vestas US 2019/0094104 A1 / US 10,209,160 B2; [E] Vestas US 2020/0011760 A1; [F] Kangwon KR 10-2013-0087920 A; [G] WO 2009/1278521; [H] US 2013/0061683 A1; [I] MTS US 5,425,276; [J] Korean Air KR 10-2016-0027529 A; [K] EP 2 848 910 A1; [L] NREL US 2010/0275695 A1.

Ground 1 — Claim 1: [A] alone, or [A] + [C] / [A] + [H]

Gap and why it closes. If "with respect to the ground" is construed as requiring the angle be measured against a terrestrial reference (horizontal/gravity), [A]'s block-to-wire angle is the only arguable gap — and [C] closes it in one sentence, decades earlier, by loading a propeller blade with a wire held "at the correct angle" by a pulley and terminating in a weight. [A] + [C] is a two-reference ground that reads on every element of claim 1. Motivation is not merely permissive but affirmative: both references are the same field (static blade/propeller structural loading), both apply a single tension member to a cantilevered lifting-surface specimen, and both are concerned with producing two load components from one wire direction — [A] expressly, [C] by running separate wires at set angles for centrifugal and air loads. One of ordinary skill seeking to control the ratio of the horizontal (rotor-plane/centrifugal-simulating) to vertical (lift/moment-simulating) component would adjust the wire elevation, which is exactly what a pulley height or a block-to-wire angle does. Predictable result, KSR rationales (A) and (C).

Confidence that claim 1 is obvious: high. (Whether [A] anticipates under a broad construction of "with respect to the ground" is a separate, closer call — and one the examiner evidently did not take, since the claims issued.)

Ground 2 — Claim 2: [A] + [C] (+ [E] or [K])

Claim 2 adds only "a mass is connected to the other end of the wire." [A] tensioned the wire with a winch/drum; swapping a deadweight for a winch is a simple substitution of one known, art-recognized tensioning means for another, with a predictable result — a constant, easily verifiable static force. It is also not a substitution the artisan would have avoided: [C] entirely loads a propeller blade by weights on wires; [E] uses a counterweight on a cable running over pulleys; [K] places weights on the blade and a first weight acting opposite gravity to set the test mean load. There is also a stated-art rationale for moving away from powered loaders: [L] (NREL) uses base excitation precisely to avoid perturbing the specimen's boundary condition/added mass, and [B], [F] and the patent's own admitted-art [J] all show powered/actuator load paths requiring load cells and calibration. A PHOSITA facing the known calibration burden of an actuator/load-cell path has an articulated reason to select gravity loading. MPEP § 2144.04 (design choice / result-effective variable), § 2144.06 (mechanical expedient).

Confidence: high.

Ground 3 — Claim 3: [A] or [B] + [J]

"Support" + "adapter at the upper end of the support to which the blade end is mounted." [B] discloses a frame unit carrying the specimen fixing unit; [J] — the patent's own admitted prior art — discloses exactly the support-plus-adapter architecture, since its hydraulic actuators are "connected to the specimen … with an adapter" mounted on a body 10 of a jig (per the '300 specification's own words). Combining is trivial: mounting a blade root on a column and bolting it through a replaceable flange/adapter suited to the root geometry is routine fixture design and is what both references already do. Nothing in the claim requires more than spatial arrangement. MPEP § 2144.04 (design choice).

Confidence: high.

Ground 4 — Claims 4, 5, 11 (and the corresponding element of 12): [B] or [A] + [G] + [E] + [F]

Claim 4: a rotating member between support and adapter for rotating the adapter about the blade's longitudinal axis. Claim 5: rotating by a second angle yields both a flap moment and a lag moment. Claim 11: same rotation as a method step.

• [G] (WO 2009/1278521, as described in the CN document citing it): root end mounted to a mounting hub that is selectively rotatable — driven by electric motor or hydraulics, remotely controllable — so the blade's pitch angle can be adjusted to choose the plane/orientation of a biaxial (flapwise + edgewise) cyclic load; the hub is then locked during the test to constrain the root in six degrees of freedom.
• [E]: a load frame with a pair of actuators applying a couple about the blade's longitudinal direction.
• [F]: an angle-changing drive unit that varies the blade specimen's pitch angle while loaded, with FBG sensing of flapwise/edgewise moments.
• [B]: simulates flap moment and lead-lag moment simultaneously from longitudinal + perpendicular load paths.

Motivation (strong). Once the desired load set includes an edgewise/lead-lag moment in addition to flap, the test engineer must orient the blade's flap plane relative to the applied load. Rotating the cantilevered blade about its own span axis is the direct, known way to do this ([G], [F], [E]). [G] supplies exactly the "adapter-side rotation to set the load plane, then lock" teaching, and its stated reason is the same as the '300's: to reproduce the real load set. And claim 5's "flap moment and lag moment" is an inherent geometric consequence, not an inventive step: a fixed wire force applied off-axis to a rotated blade decomposes into a flap-plane and an edge-plane component regardless of whether the operator recites the decomposition. Reciting the inherent result of an arrangement does not patentably distinguish it. MPEP § 2112.01; In re Best, 562 F.2d 1252 (CCPA 1977).

Confidence: claim 4 high; claim 5 high (as inherently produced) — the caveat being that a patentee will argue the combination of one oblique wire + root rotation as the thing that splits F2 into F3 (flap) and F4 (lag), and that argument is best met by [G]/[B]'s express dual-axis (flapwise + edgewise) capability; claim 11 high.

Ground 5 — Claim 6: [A] or [C] + [D] (+ [H])

"Pulley that changes the load direction, located above the blade specimen, movable vertically." [C] has a pulley holding the wire "at the correct angle." [D]/[US 10,209,160] discloses a pulley that is selectively movable to vary its vertical position relative to the blade and an actuator whose loading position is adjustable. [H] discloses cable-threaded pulley arrangements with winches and anchors. Adjusting sheave elevation to trim a load line's angle is a textbook mechanical expedient giving a predictable angle change. MPEP § 2144.06.

Confidence: high.

Ground 6 — Claim 7 (method): [B] + [A] + [C] (+ [D])

Motivation. [C] performs the identical workflow decades earlier for propeller blades: "the resultant air force and the resultant centrifugal force for each division are applied as concentrated loads. The air forces are found by means of a standard aerodynamic analysis…" and then "a wire with one end upset is slipped through the hole and run over a pulley, which holds it at the correct angle, to a suitable weight." That is steps 2–4 in substance. [B] supplies the specific three-quantity target set for rotor blades with a cantilever specimen. [A] supplies the two-axis wire-angle mechanism. There is no field boundary: all three are lifting-surface blade static/fatigue test references.

Two independent reasons the "determining" steps add no patentable weight:

1. They are analytic/mental steps. Resolution of a known load set into X/Y/Z components and a resultant is arithmetic. A claim is not saved by reciting computation; the steps must still be evaluated on the merits with the claim as a whole (MPEP § 2143.03; CyberSource Corp. v. Retail Decisions, Inc., 654 F.3d 1366 (Fed. Cir. 2011) for the related proposition that data-gathering and mental-manipulation steps carry no weight).
2. The patent admits they are routine. "Since the centrifugal force, the flap moment and the lead-lag moment are all loads that are calculated by a physical method, there is no need to further verify the load applied to the blade." That sentence is an admission that the determination step is conventional physics, which is fatal to any argument that step 2 carries the claim (In re Crish, 393 F.3d 1253 (Fed. Cir. 2004); same admission logic).

Confidence: moderate-to-high. The residual risk is the patentee's argument that no single-art-field reference determined a three-load set in order to back-solve one resultant wire force for a rotor blade — an argument that is answerable with [B] + [C] but that a panel inclined to find synergy could accept. This is nevertheless the second-weakest claim, after the claim 1 family.

Ground 7 — Claim 12: [A] + [C] + [D] + [E] + [G] (+ [B] for the frame/fixing unit)

Claim 12 is the fully integrated apparatus: wire + mass + vertically movable pulley above the blade + support and adapter + rotating member about the span axis producing flap and lag moment.

Motivation, element-by-element (the KSR "combination of known elements, each performing its known function" rationale). Each added element answers a recognized sub-problem in blade rig design, and the references state those problems themselves: (i) constant, verifiable load without disturbing boundary conditions → weights instead of actuators ([C], [E], [K], and the art-recognized calibration burden in [L] and KR 10-1137027); (ii) trim the load vector's direction → movable pulley ([D], [C]); (iii) mount the root so the blade is a cantilever → support + adapter ([B], [J], [D]); (iv) reproduce edge/lag loading as well as flap → rotate the blade about its span ([G], [F], [E], [B], [A]). The asserted benefit — "the boundary conditions same as those in the actual operation of the blade … without causing changes in the boundary conditions" — is the predictable consequence of replacing a contact load path (an actuator bolted to the article) with a gravity load path, which is precisely what [C] had already done. MPEP § 2143, rationales (A) (known elements combined), (C) (use of known technique to improve a similar device in the same way), (F) (design incentives) and (G) (design choice).

Confidence: moderate. This is the patentee's best apparatus claim, mainly because of claim breadth and the sheer number of stacked limitations; but note that many of the dependent claims (2, 3, 4, 5, 6) fall individually, so the § 103 case against claim 12 is an aggregation of individually-obvious additions rather than a single clean two-reference hit.

Ground 8 — Claims 13, 14, 15 (obtuse angle): the weak spot and the strong spot

The challenge. No reference located in this search expressly teaches applying the wire load at an obtuse angle to the blade's longitudinal direction. The available routes are:

1. Design choice / result-effective variable. [A] expressly teaches adjusting the wire-to-block angle to set the flap/edgewise load ratio — an angle selection is the very variable the reference puts under the designer's control. Once the angle is a tuning parameter, its specific value (including a value that is obtuse measured against one spanwise convention) is a design choice. MPEP § 2144.04.
2. Ambiguity makes the limitation nearly meaningless under one construction. If the wire rises outboard-and-upward from the tip (the FIG. 8 geometry, where the horizontal component F1 is the centrifugal analogue), then the angle between the wire and the root→tip axis is θ (acute), while the angle between the wire and the tip→root axis is 180°−θ (obtuse). The claim says only "a longitudinal direction," giving no orientation. Under the supplementary-angle reading, claims 13–15 add nothing whatsoever and fall with claims 1, 7 and 12 respectively.
3. Physical-consequence problem. In real rotor operation the centrifugal load is a tensile, outboard-directed spanwise load. An obtuse angle to a root→tip axis implies an inboard-directed wire component. If that is the intended meaning, the limitation describes a direction that is inconsistent with the centrifugal simulation the specification describes — a § 112(a) written-description problem (the disclosed embodiment uses an upward-inclined wire whose horizontal component is characterized as "corresponding to centrifugal force") and a § 112(b) indefiniteness problem.
4. Substitution arts worth developing. [E] applies a load via a counterweight on a cable over pulleys — i.e., a load whose direction is opposite the direct pull — which is art evidence for inboard/opposed load directions; [C] applies centrifugal and air loads along different, separately set wire directions.

The defense. If the patentee construes "obtuse angle" as the innovative point (an inboard-resolving wire that lets one wire simultaneously produce a spanwise and a bending load), then claims 13–15 are the only claims with a plausible non-obviousness story, since the reference set supplies angles but not that specific geometry. Note that these are the claims added late in prosecution and sitting at the tail of the set off independent claims 1, 7 and 12 — the natural inference is that they were the distinguishing feature obtained from the examiner, and that independent claims 1/7/12 were allowed on the broader "wire at a first angle with respect to the ground" plus grip-member combination. A challenger should expect to litigate this construction, and a patentee should expect to have to defend it under § 112.

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5. Motivation-to-combine catalog (consolidated)

No teaching away. The patent's background disparages hydraulic actuators for adding rotational boundary conditions, but (a) disparagement of a prior approach is not teaching away from the claimed combination (In re Fulton, 391 F.3d 1195 (Fed. Cir. 2004) — disclosure of alternatives is not teaching away; DePuy Spine, Inc. v. Medtronic Sofamor Danek, Inc., 567 F.3d 1314 (Fed. Cir. 2009)), and (b) the prior art does not criticize or exclude gravity/wire loading — it had already used it ([C] 1930s; [K] 2015; [E] 2016 priority). If anything, the art supplies the motivation the patent claims to have discovered.

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6. What the patentee keeps (and how to attack it)

1. Secondary considerations — no viable nexus. The only asserted advantages are (i) eliminating the boundary-condition change from actuator attachment and (ii) eliminating Wheatstone-bridge calibration. Both are the direct, expected consequence of the substituted deadweight loading, and physical-similarity nexus will therefore not attach to the difference between the claim and the prior art. And "no need to verify the load" is a statement about the method's bookkeeping, not a commercial or structural difference. There is no evidence of record of commercial success, licensing, copying, or long-felt unmet need tied to these claims — In re GPAC Inc., 57 F.3d 1573 (Fed. Cir. 1995) (nexus is the patentee's burden). The patent owner is a government research institute that has never asserted the patent (per the Litigation and PTAB sections above), so there is no commercial-success record to point to.
2. Claim-drafting vulnerabilities that support a parallel § 112 attack. (a) Claim 7's third step recites "on the basis of the values determined in the determining of the values of the centrifugal force" whereas the second step determines three quantities — an imperfect antecedent that invites a § 112(b) argument. (b) Claims 13–15's "obtuse angle" with an unoriented "longitudinal direction" is indefinite and, on the FIG. 8 geometry, potentially unsupported (§ 112(a)). Include these in any invalidity contentions; they are cheaper to prove than the § 103 case and they constrain the patentee's claim-construction options on the obtuse-angle point.
3. § 101 exposure on claim 7 (secondary). The "determining" steps are mental/analytic; the "attaching … and applying" step is physical, so claim 7 is not a pure-abstract-idea claim, but under Alice step two the inventive concept would rest on the same routine physics the specification admits. Worth pleading in the alternative only.

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7. Claim-by-claim verdict

Practical bottom line. Under the record as it stands, claims 1–12 are vulnerable to § 103 challenge, with claim 1 the most exposed (one strong two-reference ground, plus a live anticipation question on [A] alone) and claim 7 the next most exposed once [B] and [C] are added to the combination. Claims 13–15 are the patentee's defensible core and simultaneously its most likely § 112 liability. The single most valuable new references to develop for a challenge are [C] (NACA/Weick — deadweight + wire + pulley at a set angle on a lifting-surface blade) and [B] (KARI's own KR 10-1048618 B1 — the three-load set on a rotor blade specimen), because each supplies a limitation the examiner appears not to have had before him: [C] the gravity/wire/pulley loading angle, and [B] the centrifugal + flap + lead-lag target triple. Neither appears in the '300's citation list as a substantive reference, which also helps defeat § 325(d) discretionary denial in an IPR.

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8. Confidence, gaps, and what to verify next

• Fidelity caveat. I read substantive text for [A] (KR 10-1503297 B1 front page + abstract, retrieved today), [B] (KR 10-2010-0079680 A front page + claim 1), [C] (NACA TN OCR excerpt), [D] (EP 3433594 B1 description + claims, and the corresponding US 2019/0094104 claim set), [G] (a Chinese-language description of WO 2009/1278521 in a later CN filing), and [K] (EP 2848910 A1 description + claim 1). Descriptions of [H], [F], [E], [L] and [I] rest on the earlier Prior-Art section, abstracts, and claim text. [I] (MTS US 5,425,276) — whose inventor the Justia record renders as "Gram" and the earlier section as "Albright et al." — has a name discrepancy I could not resolve; do not cite an inventor name without pulling the front page.
• Verification queue: (1) pull full front pages and claim sets of NACA TN (confirm author, TN number, and 1930s date), US 2013/0061683 A1 (confirm assignee), EP 2 848 910 A1 (confirm applicant), and WO 2009/1278521 A1 (stop relying on the CN secondhand description); (2) pull KR 10-1048618 B1's full claim set to see how close its fixing unit/frame comes to claim 3 and to Ground 4; (3) confirm that US 2019/0094104 A1 and US 2020/0011760 A1 entered the U.S. national stage from PCT applications designating the U.S. (needed for clean § 102(a)(2) reliance on the publication rather than on EP family members); (4) run a native full-text search for blade-test rigs applying an axially-directed (inboard) wire load to address the obtuse-angle limitation of claims 13–15 specifically.
• Non-art caution. The WES 2021 preprint sentence about adjusting cable-blade angle via pulley-block location is the cleanest statement of the claim 6/9/10 technique, but it is post-priority and cannot be cited under § 102. Its citations (e.g., Berring et al. 2007) predate priority and are the right place to look for a citable disclosure.
• No search result contradicted a patent identifier. All numbers were used literally; nothing was auto-corrected. The only substantive correction I make to the earlier sections is the [B] classification in § 1 above.