AC Infinity v. Sinowell: Clip Fan Patent Dispute Ends in Settlement After 727 Days
AC Infinity, Inc. filed suit against Sinowell Shanghai Co., Ltd. in the Central District of California, asserting US11428245B2 — a patent covering clip fan technology for plant tents. The action concluded after 727 days when the parties settled, with the court dismissing the case without prejudice and retaining jurisdiction for 45 days to oversee completion of settlement terms.
Indoor Grow Equipment Maker AC Infinity Pursues Clip Fan IP in C.D. Cal.
AC Infinity, Inc., a California-based indoor growing equipment company, filed a patent infringement action on October 6, 2022 against Sinowell Shanghai Co., Ltd. in the United States District Court for the Central District of California (Case No. 2:22-cv-07301). The suit centered on US11428245B2, a patent covering clip fan technology specifically designed for use in plant tents — a product category central to the controlled indoor cultivation market. AC Infinity was represented by Lee and Hayes, P.C. and Wang IP Law Group PC; Sinowell by Eponym Law Group.
The case concluded on October 2, 2024, when the court entered an order dismissing the action without prejudice, citing the parties’ settlement or in-progress settlement. The court retained jurisdiction for 45 days to vacate the dismissal and reopen proceedings if the settlement could not be completed — a standard protective mechanism under C.D. Cal. practice. The terms of the settlement, including any licensing arrangement, royalty payments, or product design changes, remain undisclosed in the public record.
At 727 days, the litigation ran notably longer than the median for patent cases in this district, suggesting the parties engaged in substantive pre-trial proceedings — potentially including claim construction briefing or discovery disputes — before reaching resolution. The without-prejudice dismissal leaves open the technical possibility of refiling, though in practice a settlement dismissal of this kind rarely results in renewed action. What drove the final settlement, and whether Sinowell obtained a license or agreed to cease sales, cannot be determined from the available public record.
Filing to Case Settled in 727 days
727 days — above the ~400-day median for C.D. Cal. patent cases, suggesting substantive pre-trial litigation activity.
Case dismissed without prejudice: what the settlement outcome means for both parties
Dismissed without prejudice following settlement
A dismissal without prejudice means the case is formally closed but AC Infinity retains the right to refile the same claims in the future if settlement terms break down. The court’s 45-day retained jurisdiction window is a common protective measure ensuring parties can reopen proceedings without starting from scratch if the deal falls through. It does not signal weakness in either party’s position.
Settlement dismissalAC Infinity preserves enforcement rights and commercial flexibility
For AC Infinity, a settlement dismissal without prejudice is typically a commercially favourable result — it ends costly litigation while preserving US11428245B2 as an enforceable asset. Depending on undisclosed terms, AC Infinity may have secured a licensing arrangement or Sinowell’s agreement to stop selling competing clip fans. The patent remains valid and can be asserted against other infringers in future actions.
Patent remains enforceableSinowell avoids adjudicated infringement finding
Because the dismissal is without prejudice and terms are private, Sinowell avoids any court-issued finding of infringement. This preserves its commercial reputation, though the specific business concessions made in settlement — whether design changes, royalties, or market withdrawal — remain unknown. The absence of a merits ruling means Sinowell faces no res judicata bar, but a renegotiated dispute would likely restart under the same patent claims.
No infringement findingClip fan IP landscape tightens for indoor growing hardware makers
AC Infinity’s willingness to pursue litigation for 727 days signals it will actively enforce US11428245B2 across the indoor grow equipment sector. Competitors selling clip fans compatible with plant tents — particularly those sourcing from Chinese manufacturers — should treat this case as a credible enforcement signal. The settlement, while private, likely clarifies market boundaries around this product category without creating binding legal precedent.
Active IP enforcement signalFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | AC Infinity, Inc. | Company | Indoor growing equipment company — holder of US11428245B2 (clip fan for plant tent)Search in Eureka ↗ |
| Defendant | Sinowell Shanghai., Co., Ltd. | Company | Sinowell Shanghai Co., Ltd. — China-based hardware manufacturer alleged to infringe clip fan patent.Search in Eureka ↗ |
| Plaintiff counsel | Edward Lu | Attorney | Counsel for AC Infinity, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Hala S Mourad | Attorney | Counsel for AC Infinity, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Ryan P. Gentes | Attorney | Counsel for AC Infinity, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Songfong Tommy Wang | Attorney | Counsel for AC Infinity, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Steven Matthew Philbin | Attorney | Counsel for AC Infinity, Inc.Search in Eureka ↗ |
| Plaintiff counsel | William Brownell Dyer , III | Attorney | Counsel for AC Infinity, Inc.Search in Eureka ↗ |
| Plaintiff law firm | Lee and Hayes, P.C. | Law Firm | Representing AC Infinity, Inc.Search in Eureka ↗ |
| Plaintiff law firm | Wang IP Law Group PC | Law Firm | Representing AC Infinity, Inc.Search in Eureka ↗ |
| Defendant counsel | Yitai Hu. | Attorney | Counsel for Sinowell Shanghai., Co., Ltd.Search in Eureka ↗ |
| Defendant law firm | Eponym Law Group | Law Firm | Representing Sinowell Shanghai., Co., Ltd.Search in Eureka ↗ |
| Presiding judge | Judge N/A | Judge | California Central District CourtSearch in Eureka ↗ |
Official order — verbatim text
The court’s order reflects a standard C.D. Cal. administrative closure mechanism triggered by settlement notice. The without-prejudice framing and 45-day retained jurisdiction clause are procedural safeguards, not substantive findings — the court made no ruling on infringement, validity, or damages. For practitioners, the absence of any merits disposition means US11428245B2 carries no judicial construction of its claims from this proceeding, leaving its enforceability scope open for future litigation or inter partes review.
US11428245B2 — Clip Fan for Plant Tent: Indoor Ventilation IP
US11428245B2 (application number US16/896274) covers clip fan technology specifically configured for plant tent environments — enclosed grow structures used in controlled indoor cultivation. The patent’s claims are directed at the mechanical and functional design of a clip-mounted fan system, addressing airflow, mounting stability, and compatibility with tent frame structures. Its application to plant tents specifically — rather than general-purpose clip fans — is the technically distinguishing feature that defines its commercial relevance in the indoor growing hardware market.
For the indoor growing equipment sector, this patent represents meaningful IP in a fast-growing product category driven by the expansion of legal cannabis cultivation and broader consumer indoor gardening trends. AC Infinity is among the most prominent US brands in this space, and US11428245B2 appears to anchor its clip fan product line. Competitors and OEM suppliers — particularly those manufacturing in China for sale on US e-commerce platforms — face direct infringement exposure if their clip fan designs fall within the patent’s claim scope. The patent’s enforceability is unaffected by the settlement.
Should you run an FTO against US11428245B2?
Any company designing, manufacturing, importing, or selling clip fans intended for use in plant tents or similar enclosed grow structures should treat US11428245B2 as a primary FTO target. The AC Infinity v. Sinowell litigation confirms this patent is being actively enforced, and the product category — clip fans for controlled grow environments — is narrowly defined enough that competing products risk direct overlap with the patent’s claims. This applies particularly to e-commerce sellers sourcing hardware from Chinese manufacturers.
PatSnap Eureka’s FTO Search Agent allows R&D and product teams to map their clip fan designs against the claims of US11428245B2 in minutes — identifying whether design-arounds are viable, which claims present the highest risk, and what prior art might support an IPR filing. With no court-issued claim construction from this case, an Eureka-assisted FTO analysis is the most reliable way to assess your exposure before entering or expanding in the plant tent ventilation market.
Run a freedom-to-operate analysis on US11428245B2 to assess your product’s exposure
Run FTO in Eureka →Similar Clip Fan and Indoor Grow Equipment Patent Cases
Browse patent infringement cases involving indoor growing hardware and clip fan IP in U.S. district courts, including the Central District of California.
What this case signals for the indoor growing equipment IP landscape
AC Infinity’s sustained enforcement of clip fan IP in C.D. Cal. reflects a broader pattern of grow-room hardware makers defending product-specific patents against overseas competition.
AC Infinity treats US11428245B2 as a core commercial asset worth defending
Pursuing litigation for over two years against a Chinese manufacturer signals high-value IP strategy, not opportunistic filing. Companies selling clip fans or ventilation accessories for plant tents should audit their product designs against the claims of US11428245B2 before entering or expanding in this market segment.
C.D. Cal. is an active venue for indoor grow-room hardware IP disputes
The Central District of California is home to AC Infinity and has handled multiple hardware patent cases. Its familiarity with consumer electronics and hardware products, combined with active patent dockets, makes it a strategically attractive venue for patent holders in this category. Defendants based overseas face real procedural challenges here.
AC v Sinowell — key questions answered
AC Infinity, Inc. filed a patent infringement action against Sinowell Shanghai Co., Ltd. in the Central District of California on October 6, 2022, asserting US11428245B2 covering clip fan technology for plant tents. After 727 days of litigation, the court dismissed the case without prejudice on October 2, 2024, following a settlement between the parties. Settlement terms were not publicly disclosed.
US11428245B2 (filed under application US16/896274) covers clip fan technology specifically designed for use in plant grow tents. The patent addresses the mechanical design, mounting configuration, and functional performance of clip-mounted fans in enclosed cultivation environments, distinguishing them from general-purpose clip fans.
Dismissed without prejudice means the case is formally closed but AC Infinity retains the right to refile the same infringement claims if the settlement agreement breaks down. The court retained jurisdiction for 45 days to reopen proceedings if needed. Crucially, no court made any ruling on infringement or validity — US11428245B2 remains fully enforceable.
No. A settlement dismissal without prejudice has no effect on the validity or enforceability of US11428245B2. The patent was not adjudicated on the merits and remains a valid, enforceable asset. Third parties wishing to challenge its validity would need to initiate a separate inter partes review (IPR) proceeding at the USPTO.
AC Infinity’s willingness to litigate for over 700 days in C.D. Cal. against a Chinese competitor signals that it treats US11428245B2 as a commercially significant enforcement asset. For companies selling clip fans for plant tents — especially those sourcing from Chinese OEM manufacturers — this case is a credible warning to conduct FTO analysis before market entry or continued sales in this product category.
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