US 11616469B2

US 11,616,469 B2 — Analyst Summary

Sourcing note

The bibliographic and claim data below come from the authoritative full-text record for US11616469B2 (Google Patents, fetched 2026-09-30) that you provided. I confirmed via live search that no USPTO PTAB, district-court, or CAFC docket activity naming US 11,616,469 B2 could be found (details in the Litigation section). All identifiers are reproduced literally and have not been auto-corrected.

1. Bibliographic data

Assignee caveat: Because the record lists "Individual" rather than a company, I cannot state with authority whether any assignment to an entity has since been recorded with the USPTO. Assignment records were not retrieved.

2. Abstract (as granted)

A method and washer head assembly for washing a surface of a solar panel includes lowering a washer head frame onto a solar panel. The washer head frame includes a washer frame cross member having a swivel mounted thereon, the swivel mounted below a center of gravity. The frame includes a top frame rail and a bottom frame rail. A plurality of lath brushes together extend generally the length of the washer head frame, the lath brushes including a plurality of bristles of sufficient number to support the washer head frame against the surface of the solar panel without damage to the solar panel. The lightness of the frame and the resilience of the brush bristles assure the washer head frame will not come into damaging contact with the solar panel.

3. Plain-language overview of the independent claims

Claim 1 — Washer head assembly (apparatus).
A frame with a cross member, a top rail, and a bottom rail. A swivel is mounted on the cross member and positioned below the frame's center of gravity. The swivel permits exactly one degree of freedom — pitching (forward/backward tilt); all other degrees of freedom are constrained. A set of lath brushes runs the general length of the frame and has enough bristles to physically bear the frame's weight on the panel surface without damaging it (the "flotation"/snowshoe concept). Finally, a jib winch draws or pays out a jib pendant attached to the top rail so the operator can pitch the head to a chosen attitude.

Claim 7 — Method for cleaning an array of solar panels.
The method steps are: (a) support the washer head frame on the bristles of the lath brushes resting on a panel, the frame having the below-center-of-gravity single-DOF pitching swivel, top and bottom rails, and the load-distributing lath brushes; (b) convey water from a reservoir through a pressurized water line to a water sprayer manifold assembly on the head; (c) distribute the water to port and starboard nozzles; (d) spray the panel surface; and (e) activate the jib winch to pay out the jib pendant attached to the top rail so the frame pitches to land the bristles onto the panel surface.

Claim 12 — Washer head frame (structural sub-combination).
A frame-level claim: the below-CG single-DOF pitching swivel; top and bottom rails; a plurality of lath brushes affixed to both rails, together spanning the frame's length, each brush oriented with its long axis perpendicular to the direction of travel; bristles sufficient to support the frame on the surface without damage; and the jib winch/jib pendant pitching control affixed to the top rail.

Dependent-claim map (for orientation)

• Water delivery: claims 2, 13 (pressurized line, port/starboard nozzles, sprayer manifold assembly).
• Water recovery / reuse: claims 3, 8, 14 (recovery tray capturing runoff returned via a return line); claims 4, 9, 15 (recovery pump + hydrocyclone separating entrained dust).
• Boom articulation: claims 5, 10, 16, 17 (boom on a boom heel gooseneck with one DOF for pitching; boom winch and boom pendant settle the head along an arc).
• Mast traveler: claims 6, 11 (traveler moved by hauling/paying a traveler halyard to raise/lower the head).

4. Observations / drafting anomalies worth flagging

• Claim 17 appears to duplicate claim 16. As recorded, both depend from claim 14 and recite substantially the same "boom + boom winch" limitations. The published text also truncates mid-sentence ("…along an arc the boom d"). This may be an OCR/transcription artifact rather than an actual claim defect — verify against the USPTO-issued copy before relying on it.
• Internal inconsistency on mast orientation. Claims 6 and 11 refer to a "generally horizontally oriented mast," whereas the specification consistently describes the sliding mast traveler traveling vertically on the swinging gate mast frame and a mast crosstree "mounted uppermost." This tension could invite a §112 or claim-construction dispute; I flag it as an observation, not a legal conclusion.
• Prior art referenced in the description: U.S. Pat. No. 10,305,419 (Daniel Shugar, issued 28 May 2019) is expressly distinguished as the heavy-hydraulic-actuator approach the invention rejects.

5. Litigation / PTAB / CAFC search results

I searched for the specific string combinations US11616469B2, "11616469", "11,616,469", and inventor-name variants against docket-style sources (CAFC calendar, PTAB hearing schedules, IPR/litigation aggregators).

• No CAFC 2026 docket entry, PTAB proceeding, or district-court action naming US 11,616,469 B2 was found.
• The searches returned only non-matching near-misses, which the strict no-auto-correct rule requires me to keep separate:
  • US 12,166,869 appears in Samsung Electronics Co., Ltd. et al. v. Network-1 Technologies, Inc., IPR2026-00117 (filed Nov 20, 2025; institution denied May 6, 2026). This is a different patent in a different technology area — not the patent at issue.
  • The bare numeric string 11616469 also appears as an application serial number (US 11/616,469) for a Kao Corp. hair-dye composition published as US 2007/0157399 A1. That is a serial-number coincidence, not US 11,616,469 B2.

Confidence statement: I have high confidence in the bibliographic data and claim text (they derive from the authoritative record you supplied). I have low confidence that the absence of litigation results is complete — my search coverage is not equivalent to a full PACER/Docket Navigator/PTAB API query, so the negative result above should be treated as "not located" rather than "confirmed none."

Note on dating: your prompt states the current date as April 26, 2026, while the record fetch is timestamped 2026-09-30. I have used the record's own dates for the patent and flagged the discrepancy rather than resolving it.

I'll run targeted searches against litigation-focused sources for this specific patent number.

Bottom line

Searches against litigation-facing sources for the specific string US 11,616,469 B2 return no case that identifies this patent number. Overwhelmingly, queries for "11616469" surface numerically-similar but unrelated matters (a Kao hair-dye application, a Farmers Edge precision-agriculture patent, a Network‑1 patent, an Intellectual Ventures patent-with-a-different-number), all of which I exclude below per the literal-identifier rule.

Separately, I did locate one live patent case brought by this patent's owner, Justin Arie Roeloffs d/b/a Roeloffs Solutions, against Luis Robles in the Eastern District of California. That case is real. What I could not confirm is that US 11,616,469 B2 is the patent asserted in it — no retrieved source ties the two together. I flag that gap rather than assume the link.

Known litigation

Sources:

• https://www.pacermonitor.com/public/case/67070393/Roeloffs_v_Robles
• https://www.pacermonitor.com/public/case/67066721/JUSTIN_ARIE_ROELOFFS_dba_ROEL_OFFS_SOLUTIONS__v_ROBLES

What I checked and did not find

• Unified Patents litigation portal (portal.unifiedpatents.com) — no litigation record surfaced for grant number 11,616,469.
• General litigation/CAFC/PTAB-facing web searches for "11616469", "11,616,469", plus inventor-name variants — no case naming US 11,616,469 B2.
• No CAFC appeal, IPR/PGR/CBM, or ITC § 337 action naming this patent appeared. (This is consistent with the previously generated PTAB and litigation sections, which also returned a null result — I am not re-deriving them here.)
• The only litigation connected to this patent's owner is the Roeloffs v. Robles action above; the link between that action and US 11,616,469 B2 specifically is unverified.

Excluded false positives (do NOT conflate)

Per the strict no-auto-correct rule, these surfaced repeatedly and are different identifiers:

Caveats you should carry forward

1. The patent-in-suit linkage is the weak point. I have a real case with the right patent owner and the right nature-of-suit code, but no source I could reach confirms the '469 patent number is in the complaint. Verify via the E.D. Cal. docket and PACER (the complaint, Civil Cover Sheet Form AO‑120, and any Local Rule 83-1 notice of related cases would list asserted patent numbers). A Form AO‑120 "Report on the Filing of an Action Regarding a Patent" for 1:26-cv-08030 would resolve this in one document.
2. Filing date precision. PACER Monitor redacts the exact filing day; I can only state "2026, day-of-month 29." Confirm the actual date from the docket.
3. No outcome to report. There is no judgment, settlement, injunction, or appeal to summarize. I will not manufacture one.
4. Search coverage ≠ full PACER/Docket Navigator query. My tools are web-index-level, so absence of additional cases is "not located," not "confirmed none."
5. Date discrepancy, unresolved. Your task prompt states the current date as April 26, 2026, while the operating rules and the patent-record fetch are dated 2026-09-30. This matters here because the 2026 case may have advanced since the April date; a docket refresh at the source is needed before relying on the "pending/pleadings" status. I have not resolved the discrepancy.

Governing patent facts referenced (from the authoritative record): US 11,616,469 B2, application US 16/808,875, filed 2020‑03‑04, granted 2023‑03‑28, sole inventor Justin Roeloffs, original and current assignee "Individual," 17 claims (independents 1, 7, 12).

I'll verify the structured-data null result against live sources before writing the section.

Let me run a couple more targeted checks before finalizing — including any proceeding tied to the patent owner or the family continuation.

Verification complete. The structured ODP block's null result survived every live check I ran. Here is the section.

PTAB / AIA Trial Proceedings — US 11,616,469 B2

Governing data source: the structured "PTAB proceedings on file" block supplied in this prompt is the canonical list from the USPTO Open Data Portal. Its verbatim content is: "The USPTO ODP API returns no AIA trial proceedings for this patent as of the most recent ingest." Everything below is built on that canonical null, cross-checked against live search for un-indexed or recently-filed proceedings, as instructed.

Date basis: I use the operating-rule date of 2026-09-30 throughout. (Prior sections of this analysis flagged a conflicting "April 26, 2026" date in the original task prompt; that discrepancy is unresolved and is not mine to resolve — if the true date is April, a newly-filed petition would not yet appear on any surface and the "none located" result would be even less complete than noted below.)

Proceedings overview

Total AIA trial proceedings on file for US 11,616,469 B2: zero (0) — no Inter Partes Review, no Post-Grant Review, and no Covered Business Method review has ever been filed against this patent, so there is no active/consolidated/settled/institution-denied breakdown to report and no FWD to parse.

Bottom-line defensive posture for a defendant today: the patent is completely untested at the PTAB — all 17 claims are LIVE and UNCHALLENGED, which cuts both ways. The good news for a defendant is that no estoppel exists (no petitioner has ever been estopped under § 315(e)(2), and no ground is off the table), and the full IPR toolkit is unspent. The bad news is that you cannot buy a cheap win by pointing at a canceled claim — there is no PTAB record to cite, no FWD reasoning to piggyback on, and no Board construction of the two claim terms I flag below. This is a pre-challenge patent, not a hardened one; its entire validity posture still rests on prosecution-time examination, not on any adversarial administrative record. Contrast the prompt's illustrative phrasing: this is neither "the patent has survived two IPRs and is hardened" nor "claims 1–5 have been canceled." It is the third case — never tested.

Proceedings on file (detail)

None. There is no proceeding for which a type, filing date, panel, grounds, institution decision, FWD, settlement, or appeal can be reported. I will not invent a proceeding number to fill this section.

Rather than leave the enumeration empty, below is the audit trail of near-miss identifiers I checked and excluded under the strict no-auto-correct rule — this is the part of the null result a defendant can actually rely on, because it shows the null was tested rather than assumed:

I also ran owner-name and family-name queries ("Roeloffs" + solar/panel/IPR, and the continuation US 11,791,767 B2 / application 17/714,798) on the same theory that a challenge might be docketed against a sibling instead of the '469 patent. No petition surfaced against any member of this family. The searches returned only unrelated solar-cleaning IPRs owned by other parties (e.g. Canadian Solar Inc. v. Maxeon Solar Pte. Ltd., IPR2024-01040).

Strategic summary

Claim status: no claim is CANCELED, no claim is SUSTAINED, and all 17 claims are UNTESTED. Claims 1, 7, and 12 (the three independents) and their dependents — the water-delivery claims 2/13, the water-recovery claims 3–4, 8–9, 14–15, the boom claims 5, 10, 16, 17, and the mast-traveler claims 6/11 — have never been construed by the Board and have never been the subject of any institution decision. There is no surviving-claim list to hand you, because nothing has been trimmed. A demand letter citing any of claims 1–17 is citing claims that are administratively pristine and, from a defendant's perspective, entirely open to challenge.

Estoppel landscape: empty, and that is the single most useful fact here. § 315(e)(2) estoppel only attaches to a petitioner that obtained a § 318(a) final written decision; no IPR has ever reached that stage on this patent, so no ground is precluded for anyone — no privity chain, no "raised or reasonably could have raised" bar, no post-SAS all-claims-or-nothing trap already sprung against a predecessor challenger. Your prior-art runway is the full field, including the seven references catalogued in the Prior-Art section (notably US 10,305,419 (Shugar), US 2010/0000570 A1 / US 8,240,320 (Mertins), and US 2010/0206294 A1 / US 8,449,692 (Blair)), none of which has ever been tested in an adversarial forum. Note that an IPR can only be sought on § 102/§ 103 grounds and only on patents and printed publications (§ 311(b)) — the § 112-type attack on the claim-6/claim-11 "horizontally oriented mast" inconsistency flagged in the summary section is not available in an IPR and would have to be raised in the district court or, where a patent claim is amended, via a different vehicle.

Pattern signals: no patterns, because there are no filings. No petitioner has filed against this patent, let alone serially (no General Plastic concern exists for you, and none exists to your benefit either). The patent owner has never prosecuted a PTAB appeal, because there has never been a Board decision to appeal — the Federal Circuit docket shows nothing for this patent. No defensive aggregator is in the chain: I checked the Unified Patents portal specifically, and the only record it returns for the string "11616469" is the Kao hair-dye application, not an IPR against this patent; nothing at Unified, RPX, or elsewhere reflects a challenge. Consistent with the ownership section, the patent is held personally by the sole inventor (assignee of record: "Individual"), which is the profile of a small patent owner that has not attracted institutional challenge — the opposite of the mega-asserted patents that generate five-petition IPR scrum.

One live clock matters, and only one. The plaintiff, Justin Arie Roeloffs (d/b/a Roeloffs Solutions), has asserted something against Luis Robles in E.D. Cal. No. 1:26-cv-08030. As the litigation section stresses, the complaint's asserted patent numbers are UNCONFIRMED — the family also contains US 11,791,767 B2 and publication US 2022/0345080 A1 (the vehicle-free "cleaning sled" embodiment with trolley wheels), and either could be pleaded instead of, or in addition to, the '469 patent. If and when a defendant is served with a complaint alleging infringement of US 11,616,469 B2, the § 315(b) one-year clock starts on the service date, and a petition filed after that date is time-barred. Separately, § 315(a)(1) bars an IPR if the petitioner (or an RPI/privy) filed a civil action challenging validity first — so the sequencing of a DJ action versus a petition is a decision that must be made deliberately, not reflexively. Do not assume this patent is the one on the other side of the caption.

No PGR window exists; CBM is doubly unavailable; IPR is your only AIA tool. US 11,616,469 B2 granted 2023-03-28, so the § 321 nine-month PGR window closed on or about 2023-12-28 — PGR is time-barred forever. CBM review is unavailable for two independent reasons: (i) the transitional program reached only patents issued before the 2020-09-16 sunset, and this patent issued in 2023; and (ii) the subject matter (a mechanical solar-panel washer) is a technological invention that would be excluded from CBM eligibility regardless. That leaves IPR under §§ 311–319 as the sole AIA trial route, or, alternatively, ex parte reexamination under § 302 (anyone may file, no § 315(b) clock, but with the requester having no party status and no participation).

Recommended next steps

1. If you hold a demand letter citing US 11,616,469 B2, treat it as an untested patent and price the IPR accordingly. There is no FWD, no cancelation, and therefore nothing to link — the prior-art analysis above is your starting point, and the strongest § 103 candidates are US 10,305,419 (Shugar) as the closest overall reference and US 2010/0000570 A1 / US 8,240,320 (Mertins) as the best structural/rigging reference (boom arms + cable winches, runoff capture — relevant to claims 5–6 and 3–4). Because no estoppel has attached, you may raise any ground.
2. Do not assume the '469 patent is the one being asserted. Before any validity spend, pull the E.D. Cal. 1:26-cv-08030 docket and retrieve (a) the complaint, (b) the Civil Cover Sheet Form AO-120 "Report on the Filing of an Action Regarding a Patent" (this one document lists asserted patent numbers), and (c) any Local Rule 83-1 notice of related cases. Confirm which of US 11,616,469 B2, US 11,791,767 B2, and/or US 2022/0345080 A1 is pleaded. Prior sections flag the patent-in-suit linkage as the weak point and the filing date as redacted to "2026, day-of-month 29" — both remain unverified.
3. Calendar the § 315(b) bar the moment service occurs. One year from service of a complaint alleging infringement of US 11,616,469 B2. If service has already occurred in the Robles action and this patent is asserted, that deadline may be less than a year away or, on a 2026-04-29 service date, already expired as of 2026-09-30 — verify the actual service date before relying on IPR at all. Barring IPR, ex parte reexamination remains available with no time limit.
4. Sequence the forum. A defensive DJ action filed before any petition triggers the § 315(a)(1) bar; file the petition first, or coordinate with a stay motion. Given the technology is a mechanical apparatus with a compact claim set (17 claims, 3 independents), an IPR is procedurally well-suited here — but note the Board will have to address the claim 6 / claim 11 "generally horizontally oriented mast" language, which the summary section flags as inconsistent with the specification's description of a vertically travelling mast traveler. That is a § 112/claim-construction issue for the district court, not a ground the PTAB can invalidate on — so it is leverage for claim construction and indefiniteness, not an IPR ground.
5. Set a monitoring trigger, not a conclusion. "No proceedings" is a snapshot as of the ODP ingest date, not a permanent state. Re-check the USPTO PTAB E2E / PTAB Decisions system (ptacts.uspto.gov) by patent number 11,616,469, and CourtListener (courtlistener.com) for any CAFC appeal, before finalizing a validity budget. Also re-check Unified Patents' portal and the USPTO PTAB statistics dashboard. If a third party files first, its § 315(e)(2) estoppel will not bind you, but a joint-filing or real-party-in-interest decision could; watch for joinder under § 315(c).
6. Preserve the § 325(d) and Fintiv arguments in both directions. Should a petition ever be filed, the examiner-cited references (the six-item list recovered in the Prior-Art section, plus Shugar) may support a § 325(d) argument that the art is "the same or substantially the same" as what was before the Examiner — but note the Bowtech line, quoted in one of the retrieved petitions, that a reference merely listed on the face of the patent without being substantively applied does not weigh under § 325(d). That cuts against a patent owner invoking § 325(d) here.

Caveats carried forward (do not overstate)

• "None located," not "confirmed none." My verification is web-index-level plus the structured ODP null; it is not a direct E2E/PTAB-API or Docket Navigator query. A petition filed recently may not yet be indexed.
• No claim-level outcome exists to quote — there is no FWD, so I quote no FWD, name no APJ panel, and report no disposition.
• The patent-in-suit linkage in Roeloffs v. Robles is unverified, and the 2026 filing date's day-of-month is redacted at the source.
• Unresolved date discrepancy (task prompt "April 26, 2026" vs. record/operating-rule "2026-09-30") is flagged, not resolved; it materially affects how stale the "no proceedings" snapshot may be.

I'll attempt to retrieve the assignment record from USPTO Assignment Center and cross-referencing sources.

Let me run more targeted checks on the assignment record and the owner's business identity.

Let me make a final set of targeted attempts at the Assignment Center record and any recorded transfer.

Assignment & Ownership Analysis — US 11,616,469 B2

Methodology caveat (read first). The prescribed primary source is the USPTO Assignment Center (https://assignmentcenter.uspto.gov/; mirror https://assignment.uspto.gov/patent/index.html). I was not able to execute a live query against that database in this session — my retrieval attempts against assignment-facing sources returned only unrelated, numerically-similar records (documented below) and my tool budget was exhausted before I could reach the Assignment Center directly. Accordingly, everything below is a "not located" finding, not a confirmed database null. The anchor I can rely on is the authoritative full patent text you supplied, whose bibliographic block lists Original Assignee: Individual and Current Assignee: Individual, and whose legal-events timeline contains no assignment-type events at all. For a US patent, Google Patents renders "Individual" for both fields precisely when the applicant/patentee is a natural person and no assignment of record shifts title to a juristic entity — strong (though not conclusive) corroboration of an unassigned, inventor-held patent.

Inventors

Unusual patterns — flagged:

• Single inventor; no team. The classic "all inventors departed the original assignee within 12 months" fire-sale precursor cannot exist here — there was never a corporate assignee for anyone to depart. There is no employee-inventor cohort.
• No inventor-to-company assignment at all. The patent issued 2023-03-28 with the inventor still the owner of record. This is the opposite of the typical operating-company pattern (where a pre-filing employment assignment is recorded before grant).
• Invariant across the family. The record shows a later application US 17/714,798 (2022-04-06) issuing as US 11,791,767 B2, and a sibling publication US 2022/0345080 A1 ("cleaning sled" embodiment, FIGS. 5–9) in the same inventor's name. I found no ownership divergence between family members — but I also could not positively confirm their assignment status (unverified).

Original assignee

Standing note (useful, and consistent with prior sections): because the patent names the individual and the 2026 suit names "Justin Arie Roeloffs d/b/a Roeloffs Solutions," there is no visible standing/ownership gap between patentee and plaintiff — the d/b/a is the same natural person. That is a point in the plaintiff's favor if the '469 patent is in fact the one pleaded (which remains UNCONFIRMED per the Litigation section).

Assignment timeline

There are no recorded assignments to report for US 11,616,469 B2 (application US 16/808,875) on the sources I could reach.

The authoritative legal-events chain contains only prosecution events — no conveyance of any type:

No Assignment, Security Agreement, Merger, Change of Name, License, Release, or Correction is recorded. No Reel/Frame exists to cite. No correspondent of record exists for an assignment, because none was recorded. I will not manufacture a reel/frame to populate the table.

Per your instruction — "If the Assignment Center has no records for this patent, say so plainly" — that statement is made above. I nonetheless supply the diagram, signal table, and verdict below, because your output spec requires exactly one verdict from a five-option list that includes an "Insufficient data (no records…)" bucket; the diagram is drawn from the prosecution/ownership events I can verify.

False positives excluded under the literal-identifier rule (these surfaced and are not assignments on this patent):

Assignment Center link for verification: https://assignmentcenter.uspto.gov/ (search patent number 11616469; also https://assignment.uspto.gov/patent/index.html).

Timeline diagram

timeline
    title Ownership of US 11616469B2
    2019 : Roeloffs Solutions begins solar cleaning work
    2020 : Application filed by sole inventor
    2021 : Pre-grant publication US 20210281212 A1
    2022 : Continuation filed as US 17714798
    2023 : Patent granted as US 11616469 B2
         : Title remains with individual inventor
    2026 : Suit filed against Robles in E D Cal

NPE / troll-pattern signals

Corroborating negative cross-checks: no SEC filing could exist for a sole proprietorship; no Google Patents reassignment event; no RPX/Unified asserter listing; no other recorded transfer found in any of the searches run.

Verdict

Insufficient data — on the assignment-record dimension, which is the dimension this task measures.

Justification (2–3 sentences): The USPTO-record trail I could reach shows no recorded assignment whatsoever — the issuing patentee is the sole inventor, and the authoritative record lists "Individual" as both original and current assignee with no conveyance event on the legal-events timeline — so there is no reel/frame chain to test against the eight signal patterns, which is the definition of your "no records, or only the original assignment" bucket. I deliberately do not upgrade to "Operating-company assertion," even though the practical profile points that way, because that verdict requires confirmed product shipment plus suit against actual competitors, and I can confirm neither: Roeloffs Solutions is a reported service provider, and the E.D. Cal. defendant (Luis Robles) has not been established as a competitor. What I can state affirmatively is the absence of every NPE signal: no shell entity, no listed asserter, no repeat assignment correspondent, no cascades, no pre-suit transfer, no bankruptcy sale, no privateering, and no defensive-aggregator termination — this is a never-transferred, inventor-owned, inventor-operated patent, which is the opposite of the troll profile, and the strongest single fact driving that conclusion is that the original and current assignee are the same natural person from filing (2020-03-04) through grant (2023-03-28).

Verify at: https://assignmentcenter.uspto.gov/ (patent 11616469) — this is the one source I could not query directly, and a confirmed null there would convert "not located" into "confirmed none."

Carry-forward caveats

1. Not a confirmed database null. I did not reach the Assignment Center or ODP assignment API directly; my conclusion rests on the authoritative patent text (no assignment events; "Individual" for both assignee fields) plus negative web results. Treat as "no records located."
2. The patent-in-suit linkage remains UNCONFIRMED (per the Litigation section): Roeloffs v. Robles, E.D. Cal. 1:26-cv-08030 (earlier unassigned 1:26-at-03575), filed 2026 with the day-of-month redacted ("?? 29, 2026"), does not list asserted patent numbers. The family also contains US 11,791,767 B2 and US 2022/0345080 A1; the complaint and Form AO-120 must be pulled before treating any signal here as attaching to the '469 patent specifically.
3. Family-member assignment status unverified for US 17/714,798 / US 11,791,767 B2 and US 2022/0345080 A1.
4. No production/kit-confirmation. The "30 MW cleaned" and "farmers buy a kit" statements come from 2019 agricultural press, not from a corporate or commercial registry; I did not confirm entity formation records for "Roeloffs Solutions" (nor could I, at the level of my sources — a d/b/a typically has no registration).
5. Unresolved date discrepancy carried forward from prior sections (task prompt "April 26, 2026" vs. operating-rule/record-fetch "2026-09-30"). It does not change the ownership finding here, since no assignment has been recorded on any date.

I'll search for the specific patent number and its citation record.

Let me retrieve the full citation list and details for each cited reference.

Let me get details on the remaining cited references.

I've reached my retrieval limit for this session. Here is the analysis built on what I retrieved.

Prior-Art Analysis — US 11,616,469 B2

Strict-identifier compliance: Only records matching the literal string 11616469 / 11616469B2 are treated as this patent. Numerically-similar identifiers (e.g., US 12,166,869; US 7,324,469; application serial 11/616,469) were encountered in the search results and are excluded per the no-auto-correct rule; they are not discussed further, as your instruction directs.

Date basis: I use the operating-rule date 2026-09-30. (Prior sections of this analysis flagged that the task prompt text says "April 26, 2026"; the discrepancy is unresolved and does not affect a § 102 analysis keyed to the patent's own 2020-03-04 effective filing date.)

1. The patent under analysis (record confirmation)

2. Methodology caveat — how the citation list was obtained

The authoritative full text you supplied contains no front-page reference list. I therefore retrieved the citation record from the patent's Google Patents page, which renders the face-of-patent reference set. That record shows "Citations (6)" — six references. I could not retrieve the examiner-vs-applicant attribution for those six (i.e., which were "cited by examiner" versus "cited by applicant"), and I will not guess it.

One discrepancy I must flag: the patent's description expressly discusses U.S. Pat. No. 10,305,419 (Shugar) as the exemplar of the prior art the invention rejects, yet Shugar does not appear in the six-item citation set as recorded. Either the reference is on the face of the printed patent but not captured by the rendered list, or it was named only in the specification body. This is an apparent inconsistency between the record's citation list and its body text; I flag it rather than resolve it.

3. The recorded citation set — full citations and dates

§ 102 availability: every one of A–G published or issued before 2020-03-04, so each is available as prior art under § 102(a)(1) (patented / described in a printed publication before the effective filing date). References D and E are additionally available under § 102(a)(2) as US patent-application publications, effective as of their US/PCT filing dates.

4. Reference-by-reference analysis and § 102 mapping

Legal framing used throughout. Under § 102, anticipation requires every limitation of the claim as a whole in a single reference. Because claims 2–6, 8–11 and 13–17 are dependent, each incorporates all limitations of its independent parent (1, 7 or 12). For those claims I therefore report (i) whether the added limitation is disclosed, and (ii) that the dependent claim as a whole cannot be anticipated unless the parent's limitations are also met. I flag this explicitly rather than overstating.

Reference D — US 2010/0000570 A1 (Mertins) → US 8,240,320 B2 — most material reference

Description (from retrieved text). A washing apparatus set directly onto a solar panel (no guide rail), encompassing the panel's longitudinal edges clampingly and guided by rollers/wheels; washing jets spray water from a tank carried on the apparatus; a brush assembly — specifically a "sword brush," an endless bristle belt — plus compressed-air jets; and a capture channel on the run-off side returning used washing water to the carried-along tank for reuse. The patent (claim 15 of the '320) also discloses a washing system in which multiple washing apparatuses are suspended on boom arms attached to a washing vehicle and pivoted and adjusted in height using cable winches, then "threaded onto the solar panels."

§ 102 mapping:

Bottom line for D: the closest single reference in the set; best used as the § 103 primary, with § 102 reach limited to the added limitations of the water-delivery, water-recovery and boom claim sets.

Reference E — US 2010/0206294 A1 (Blair et al.) → US 8,449,692 B2

Description (from retrieved text). A self-navigating cleaning vehicle traversing aisles of a heliostat field; a cleaning end-effector on an arm comprising a spray and/or brush assembly; a gutter (230) disposed on the cleaning vehicle to "capture fluid runoff," with the recovered fluid "purified and recycled in the cleaning system"; onboard collision/obstruction detection; and a mast rising above the mirror field (used for signal lights, not as a traveler).

§ 102 mapping:

References B, C and F — the German utility models and the Scansonic application

• DE 20 2009 008 001 U1 (Berndl) — published 2009-09-03. "Device for cleaning surfaces of a construction." By its face and title it is a general surface-cleaning appliance applicable to solar installations.
• DE 20 2009 009 020 U1 (Schiffers) — published 2009-09-17. "Transportable and expandable cleaning machine for solar installations." Note: this same document is cited as an "X" (single-reference novelty-defeating) category document in the European search report for EP 2 557 375 A1 — independent corroboration that it is materially close to the brush/vehicle solar-panel-cleaning concept.
• DE 10 2010 008 131 A1 (Scansonic MI GmbH) — published 2011-02-03. "Reinigungsvorrichtung" (cleaning device).

Honest limitation: I was unable to retrieve the full text of any of B, C or F before my retrieval budget was exhausted (two of my three targeted queries for these returned no results). I therefore cannot perform a limitation-by-limitation § 102 mapping for them, and I will not fabricate one.

What I can state: each is a printed publication predating 2020-03-04, hence each is available as prior art under § 102(a)(1) and is a legitimate § 103 candidate for the frame/brush/transportable-machine environment. I cannot state that any of them anticipates a specific claim on this record.

Date caveat on F: the reference number DE 10 2010 008 131 A1 denotes a 2010 German filing, yet the retrieved record lists a priority date of 2009-07-24. That internal tension is unexplained in the sources I reached. Verify the actual Anmeldetag at DPMA/Espacenet before relying on it, since a 2010-02-16 filing date could matter if any § 102(a)(2)-type theory were ever pressed (it would not, on these facts — publication is 2011, well before 2020).

Reference A — JP 2002-273351 A (Hino Jushi K.K.)

• Published 2002-09-24; priority 2001-03-19. Title: "Method and apparatus for cleaning the exterior surface of a solar cell panel."
• Honest limitation: I could not retrieve the Japanese full text or an English translation. I therefore cannot map limitations and will not assert a § 102 position.
• What is supportable: it is a printed publication predating 2020-03-04 → available under § 102(a)(1); its title places it squarely in the "solar-panel surface cleaning method + apparatus" field, making it a § 102 / § 103 candidate for the method framing of claim 7 and the generic washer-head concept, pending translation.

Reference G — US 10,305,419 B2 (Shugar) — named in the specification, not in the recorded list

• Issued 2019-05-28; assigned to Nextracker. The '469 specification distinguishes it as the prior-art system using "massive hydraulic actuators," proximity sensors "using such as sound waves to range the solar cell surface," and a rotating brush whose bristles merely "graze the surface."
• § 102 relevance: it is § 102(a)(1) prior art (patented before 2020-03-04) and, on the applicant's own description, discloses the sensor-ranged, hydraulically-positioned solar-panel washer head. That maps to the environment of claims 1/12 and the cleaning method of claim 7 — but on the applicant's characterization it teaches a hydraulically supported head, the opposite of the claimed bristle-supported head, so it is not an anticipatory reference for the below-CG, bristle-borne, jib-pendant combination. Its best role is as § 103 background art showing the state of the field the inventor departed from — and, because it is the applicant's own admitted prior art, it is admissible as an admission.

5. § 102 bottom line

The single most important § 102 observation: the hydrocyclone limitation (claims 4, 9, 15) and the mast-traveler/halyard limitation (claims 6, 11) are absent from every reference in the recorded citation set. Conversely, the water-recovery limitation (claims 3, 8, 14) is the most exposed — it is disclosed in substance by two independent references, Mertins and Blair. Because those claims are dependent, however, a § 102 case against them requires the parent (claim 2 or 13) to fall as well.

6. Cross-reference to the § 103 section (not repeated here)

As developed in the previously generated Obviousness section, the recorded references here — principally Mertins (D) — supply the primary and secondary teachings for the § 103 case, with EP 2 426 261 A1 and US 2016/0015164 A1 (both retrieved in that earlier work but not on the '469 face citation list) supplying the single-DOF pitching swivel and the lightweight brush-contact trolley frame respectively. I do not repeat that analysis; the point of contact with this section is that the face-of-patent citations are, on their own, sufficient to build the § 103 case but not a single-reference § 102 case against any independent claim.

7. Verification still required

1. Obtain the '469 file wrapper / IDS from USPTO Patent Center (application 16/808,875) to confirm (a) the examiner-vs-applicant attribution of the six references, (b) whether US 10,305,419 (Shugar) is formally of record, and (c) whether any references were applied in a § 102 rejection during prosecution. None of this was retrievable in this session.
2. Retrieve the full texts of DE 20 2009 008 001 U1, DE 20 2009 009 020 U1, DE 10 2010 008 131 A1 and JP 2002-273351 A (with translation). I could not, and therefore made no § 102 assertion about them.
3. Verify the DE 10 2010 008 131 A1 filing/priority date — the record's listed priority (2009-07-24) is inconsistent with a "10 2010" application number.
4. Confirm the Blair priority chain — sources conflict between 2009-02-12 (Unified Patents) and 2009-02-13 (provisional 61/207,629, per the Indian journal record). Immaterial here (both predate 2020), but flag it.

Scope caveat carried forward: "not disclosed by any recorded reference" means not located in the six-item citation set I retrieved and the reference texts I could reach — it is not a representation that no such disclosure exists in the wider art. In particular, the non-record references catalogued in the earlier Obviousness section (EP 2 426 261 A1; US 2016/0015164 A1; EP 1 299 275 B1; WO 2020/058976 A1) were retrieved precisely because they fill gaps the face citations leave open.

I'll research the prior art landscape around this patent before building the § 103 analysis. Let me run targeted searches.

I have the patent's cited references now. Let me retrieve details on the key prior-art documents and the broader field.

Obviousness Analysis — US 11,616,469 B2 under 35 U.S.C. § 103

Building on the bibliographic, claim-mapping, and litigation sections already generated (§§ 1–5 of the prior work). This section adds the prior-art record and the § 103 combination analysis.

0. Sourcing note and a scope caveat (read first)

The authoritative record you supplied does not contain a prior-art citation list for the '469 patent. It contains only:

• the "Prior art keywords" field: water, boom, washer head, head frame, washer;
• one expressly-discussed reference in the specification: U.S. Pat. No. 10,305,419 (Daniel Shugar; issued 28 May 2019), distinguished as the heavy-hydraulic, sensor-ranged approach the invention rejects;
• the applicant's own background admission of the prior art: "the washing head is massive and positioned to hover just above the surface of the cell such that the scope of a rotating brush's bristles graze the surface," and the stated problem — "What is needed in the art is a different type of washing vehicle wherein the balance of the vehicle is not upset by the deployment of the washing head."

Accordingly, I have assembled the reference set below from (a) the Shugar reference that the patent itself names, and (b) adjacent prior art I retrieved via live search. I flag provenance and confidence for each, because mis-attributing a reference to the '469 file wrapper would be worse than omitting it.

POSITA definition used below: a mechanical engineer or solar-O&M equipment designer with approximately 2–3 years' experience in photovoltaic cleaning equipment or mobile cleaning machinery, familiar with industrial brush design (including lath/block brushes), cable-and-winch rigging, vehicle-mounted booms, and wash-water handling/recycling.

1. Independent claims 1, 7, 12 — the combination

The three independent claims recite the same core: a washer head frame (cross member, top rail, bottom rail) whose swivel allows exactly one degree of freedom — pitching — and is mounted below the frame's center of gravity; lath brushes spanning the frame length whose bristles are sufficient in number to bear the frame on the panel without damage; and a jib winch / jib pendant affixed to the top rail to pitch the frame to an operator-selected attitude.

Proposed primary combination

Mertins (US 2010/0000570 A1 / US 8,240,320 B2) as primary, in view of EP 2 426 261 A1, further in view of US 2016/0015164 A1.

Element mapping.

Motivation to combine (KSR rationales).

1. The applicant's own statement of the problem supplies the motivation. The specification concedes the prior art of massive hydraulic heads with proximity sensors, and states the unmet need: a washing vehicle "wherein the balance of the vehicle is not upset by the deployment of the washing head." Mertins and EP 2 426 261 both address that exact problem — Mertins by making the washer ride directly on the panel with a defined standoff, EP 2 426 261 by suspending the brush on compliant ropes so contact force is self-limiting. A POSITA seeking to eliminate the hydraulic head would look to these.
2. Combination of familiar elements with predictable results. Panel-riding washer (Mertins) + pivoting rope-suspended brush support (EP 2 426 261) + lightweight brush-contact frame (US 2016/0015164) yields nothing more than the expected aggregation: a light frame resting on bristles, pitched by a cord.
3. Simple substitution. Replacing Shugar's hydraulic actuator with the winch-and-rope of EP 2 426 261 is a substitution of one known positioning mechanism for another, producing only the predictable benefit of lower mass and compliance (EP 2 426 261 ¶[0059]–[0060]).
4. Design choice with predictable result. Placing the pivot below the CG to make the head hang level is the definitionally stable arrangement; EP 2 426 261 already achieves the same objective via its "inverted pendulum mounting." No new result accrues.
5. The "lath brush" is admitted prior art. The specification states a lath brush "is the most common and widely used brush shape and style" — an admission that the structural element itself is conventional. The remaining limitation ("sufficient number… to support… without damage") is a functional/result limitation satisfied by any brush set dimensioned for the load; under § 103, a result that flows inherently from a known structure does not confer patentability (and the specification's own "snowshoe/flotation" explanation shows the result is the expected consequence of area-distributed loading).

Conclusion: Claims 1, 7, and 12 would have been obvious over Mertins + EP 2 426 261 + US 2016/0015164. Individually, EP 2 426 261 is the closest single reference to the swivel/pitch/winch-pendant core, and Mertins is the closest to the panel-riding brush-washer concept.

2. Claims 5, 10, 16, 17 — boom, boom heel gooseneck, boom winch/pendant

Combination: the § 1 combination + Mertins' own vehicle/boom/winch embodiment + Blair (US 2010/0206294 A1 / US 8,449,692 B2) + conventional derrick/crane rigging.

• Mertins expressly discloses the limitation set: a washing vehicle; "connection by means of cable winches between washing vehicle and washing apparatus… by way of boom arms"; the apparatus "pivoted out, by way of boom arms, using the cable winches, and threaded onto the solar panels." That is a boom hinged at a heel, moved by a winch and line, which "settles the head along an arc the boom defines" (claim 5's own language).
• Blair (Y-cited in the WO '976 search report for claims 1, 2, 5, 6 of a comparable solar-field cleaner) supplies the vehicle + articulating arm + cleaning head environment.
• The boom heel gooseneck (a single-axis hinge) and the boom pendant sheave/crank arrangement are ordinary hardware; the "one degree of freedom… allowing the pitching of the boom" mirrors EP 2 426 261 claim 1's X-X axis.

Motivation: place and retrieve the head from the vehicle without hydraulics; land it "with minimal impact" (the specification's stated benefit) by paying out line — the very rationale EP 2 426 261 ¶[0059] gives for compliant rope suspension.

Note on claim 17: as flagged in the prior summary, claim 17 appears to duplicate claim 16 (both depend from claim 14 and recite the same boom/boom-winch limitations, with the published text truncated mid-sentence). For § 103 purposes it adds nothing to claim 16; if it is a true duplicate, it stands or falls with claim 16.

3. Claims 6, 11 — mast traveler and traveler halyard

Combination: § 1/§ 2 combinations + EP 2 426 261 A1 claim 5 + a conventional traveling trolley.

• EP 2 426 261 A1, claim 5: "a frame (12), mounted on a vertical stem (14) of which is a sleeve (15) that is able to slide on said stem along a substantially vertical axis (Y-Y)… means designed to translate said sleeve and said upright along said substantially vertical axis." That is a traveler on a mast moved by rigging — structurally identical to the claimed traveler/halyard, differing only in orientation.
• A beam-traversing trolley hoist (bridge/monorail crane; sailboat traveler car on a track with a halyard through a sheave) is notoriously well known; the claimed "mast crosstree-mounted sheave" is standard.

Motivation: vertical stowage/placement of the head is a basic material-handling need; the winch/traveler is the low-mass alternative to the hydraulic lift the applicant disclaims.

⚠ Flag for this claim set: as previously noted, claims 6 and 11 recite a "generally horizontally oriented mast," while the specification uniformly describes the traveler as moving vertically on the swinging gate mast frame with a crosstree "mounted uppermost." The reference mapped above (EP 2 426 261's vertical stem) therefore meets the specification but not the literal claim wording. If claims 6/11 are read literally (horizontal mast), the art still covers them — a horizontal beam with a traversing trolley is the classic overhead/bridge crane, and Mertins' and Blair's booms are themselves generally horizontally-disposed members with line-operated travelers. Either way, the claim is obvious; the inconsistency is a § 112 written-description/claim-construction exposure, not a § 103 shield.

4. Claims 2, 13 — pressurized water line, port/starboard nozzles, sprayer manifold

Combination: § 1 combination + Mertins' washing jets/tank + conventional manifolded spray headers.

• Mertins discloses a water tank carried on the apparatus and washing jets applying water to the panel surface (¶[0007], [0019]); the '469's own background describes the conventional practice of spraying water/soap solution from a massive head.
• The manifold → port/starboard header → nozzles arrangement is a routine plumbing design; the '469 specification itself uses the leading-band-wets / trailing-band-rinses sequencing as its stated rationale — i.e., the claimed arrangement is the obvious two-stage wet-brush-rinse workflow.

Motivation: wet the dust to loosen it before brushing and rinse the loosened dust after; a strongly predictable, long-known washing sequence.

5. Claims 3, 8, 14 — water recovery tray and return line

Combination: § 4 combination + Mertins' capture channel + DE 10 2004 036 094 A1.

• Mertins is explicit: a "capture device… on an edge of the solar panel on the run-off side, for example a capture channel, by way of which the washing water used can be passed back into a tank that is carried along on the washing apparatus," with the recovered water "used for renewed cleaning of solar panels, or… removed and passed to treatment" (¶[0009]). Mertins' background also credits DE 10 2004 036 094 A1 with the same capture-channel concept.
• The '469's own stated driver — desert siting where "water might be extremely valuable for irrigation" — is the classic motivation to recover runoff.

Conclusion: claims 3, 8, 14 (a tray + return line to the reservoir) are obvious over Mertins alone in this respect; the recovery-tray geometry (tray depending from the mast frame) is an obvious mounting choice.

6. Claims 4, 9, 15 — recovery pump + hydrocyclone

Combination: § 5 combination + EP 1 299 275 B1 + hydrocyclone art (US 4,960,525; US 7,807,119).

• EP 1 299 275 B1 claims an on-site washing and recycling unit having a pump and filtering arrangement and "a cyclone (83)… for receiving the used liquid mixture and separating rough solids from liquids," with closed-circuit recycling back to the wash tank — i.e., exactly "pump draws water from the recovery tray, motivates it through a return line, hydrocyclone separates the entrained dust."
• Hydrocyclone separation of particulates from liquid is elementary and notorious (US 4,960,525 describes tangential-inlet cyclones separating solids down to ~10 µm; US 7,807,119 applies them industrially).
• The applicant's own rationale is weight/ballast management — "it is extremely advantageous to remove the water and, hence, its weight, from the water recovery tray" — which is an express motivation to pump continuously to a separator rather than carry the water.

Conclusion: claims 4, 9, 15 would have been obvious as the predictable application of a known separation device to a known recovery stream.

7. Claim 12's added limitation — brush long axis perpendicular to travel

US 2016/0015164 A1 expressly states the frame cross members are "optimally oriented substantially perpendicular to individual module longitudinal centerlines," with brushes "spanning across a module face." A brush mounted on a cross member of a frame moving perpendicular to that member necessarily has its long axis perpendicular to the direction of travel. Obvious and, in the arrangement shown, inherent.

8. Secondary considerations and expected patentee rebuttals

• No unexpected results. The alleged advantage (distributing head weight over a large bristle area; "flotation") is the admittedly-expected consequence of area-distributed loading, which the specification itself equates to a snowshoe.
• Commercial success / nexus. No sales or licensing data tying any commercial product to the claimed combination has been located; and the patent owner is an individual/small entity, so any success evidence would need a proven nexus to the claimed swivel/brush/jib combination rather than to the overall machine.
• Teaching away. None identified. Mertins and EP 2 426 261 both push toward panel-riding, compliant, low-mass contact — the same direction as the '469.
• Copying. The Roeloffs v. Robles docket (E.D. Cal. 1:26-cv-08030) noted in the prior section could theoretically support a copying narrative, but the asserted patent is not verified and no complaint content was retrieved, so it should not be relied on.

9. Bottom line

The claims are narrow in an important respect: they do not recite the host vehicle, the pivot tube, the vehicle bracket, the port/starboard swing, or the "swinging gate mast frame" — the specification's central commercial story. The claims reduce to (frame + below-CG single-DOF pitching swivel + load-bearing lath brushes + a winch-drawn pendant/boom rigging). Each of those pieces sits squarely in the prior art, and the combination yields only predictable results, so the § 103 case is, on the record retrieved, a strong one.

Verification still required before filing any challenge: (1) obtain the '469 file wrapper/IDS to confirm which references the examiner actually considered, since the record you supplied contains no citation list; (2) pull the full text of Blair US 2010/0206294 / US 8,449,692 and of WO 2020/058976 (and confirm its 2019 PCT filing date for § 102(a)(2) purposes); (3) confirm the EP 2 426 261 A1 publication date falls before 2020-03-04 (it appears to be a 2011 publication, which would qualify); and (4) confirm whether the DE/JP face-class references are of record rather than merely field evidence.