VDPP, LLC v. Belkin: Patent Infringement Action Dismissed With Prejudice
VDPP, LLC asserted US10021380B1 — covering faster state transitioning for continuous adjustable 3Deeps filter spectacles using multi-layered variable tint materials — against Belkin in the Central District of California. The case ended in a voluntary dismissal with prejudice after just 143 days, with each party bearing its own costs.
Early exit: VDPP drops infringement claim with prejudice before Belkin answers
On 26 July 2024, VDPP, LLC filed suit against Belkin in the U.S. District Court for the Central District of California (Case No. 2:24-cv-06330), asserting infringement of US10021380B1. The patent relates to faster state transitioning for continuous adjustable 3Deeps filter spectacles using multi-layered variable tint materials — a display-accessory technology domain. VDPP was represented by Ramey LLP, a firm with a notable plaintiff-side patent enforcement practice, while Belkin retained Duane Morris, LLP.
The case closed on 16 December 2024 — just 143 days after filing — when VDPP filed a notice of voluntary dismissal under Federal Rule of Civil Procedure 41(a)(1)(A)(i). Crucially, VDPP stipulated that the dismissal is with prejudice as to the asserted patent, meaning VDPP permanently surrendered its right to re-assert US10021380B1 against Belkin. The filing also confirmed that each party would bear its own legal costs, with no fee-shifting or settlement payment disclosed in the public record.
The 143-day resolution is notably brief and suggests the parties may have reached a private arrangement, or that VDPP concluded continued litigation was commercially unviable — though the public record is silent on any underlying terms. The dismissal was filed before Belkin answered or moved for summary judgment, which is the procedural window that permits a plaintiff to dismiss unilaterally under Rule 41(a)(1)(A)(i). What drove VDPP to accept a with-prejudice outcome without extracting a public concession from Belkin remains unknown from available filings.
Filing to Voluntary dismissal in 143 days
143 days — resolved well before typical district court trial timelines
Dismissed with prejudice: what the voluntary exit means for both parties
Rule 41(a)(1)(A)(i): plaintiff’s unilateral right to dismiss
Federal Rule of Civil Procedure 41(a)(1)(A)(i) permits a plaintiff to dismiss an action without a court order by filing a notice before the defendant serves an answer or a motion for summary judgment. VDPP exercised this right here, but unusually elected to make the dismissal with prejudice — a self-imposed restriction that extinguishes the plaintiff’s claims permanently against this defendant on this patent.
Procedural exit — no merits rulingWith prejudice: VDPP cannot re-assert this patent against Belkin
A dismissal with prejudice operates as a final judgment on the merits, permanently barring VDPP from bringing the same claims against Belkin under US10021380B1. This is a significant concession by the plaintiff. By contrast, a dismissal without prejudice would preserve the right to re-file. The public record confirms the with-prejudice designation explicitly, leaving no ambiguity on this point.
Claim permanently extinguishedBelkin exits with permanent protection from this patent claim
Belkin achieves a highly favourable outcome: permanent insulation from US10021380B1 infringement claims by VDPP, without having to litigate the merits, file an answer, or seek inter partes review. The cost-bearing arrangement — each side pays its own fees — means Belkin receives no fee award, but avoids the cost and risk of full trial proceedings. This outcome is consistent with a commercially negotiated resolution reached privately.
Belkin: protected, no fee awardPatent survives — but its enforceability signal is weakened
US10021380B1 remains in force and VDPP is free to assert it against other parties. However, a with-prejudice voluntary dismissal at this early stage — before any claim construction or merits ruling — may signal to other potential defendants that the patent faces vulnerabilities. Companies in the 3D display accessories and variable tint optics space should assess their own exposure to this patent and monitor VDPP’s future enforcement activity.
Patent active; enforcement signal ambiguousFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | VDPP, LLC | Company | Patent assertion entity — holder of US10021380B1 covering 3D spectacles variable tint technologySearch in Eureka ↗ |
| Defendant | Belkin | Individual | Belkin — consumer electronics and accessories manufacturer defending against patent infringement claimSearch in Eureka ↗ |
| Plaintiff counsel | Susan S. Q. Kalra | Attorney | Counsel for VDPP, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Ramey LLP | Law Firm | Representing VDPP, LLCSearch in Eureka ↗ |
| Defendant counsel | Robert Kum | Attorney | Counsel for BelkinSearch in Eureka ↗ |
| Defendant law firm | Duane Morris, LLP | Law Firm | Representing BelkinSearch in Eureka ↗ |
| Presiding judge | Judge N/A | Judge | California Central District CourtSearch in Eureka ↗ |
Official order — verbatim text
The dismissal notice is precise and self-limiting: VDPP explicitly invoked Rule 41(a)(1)(A)(i) — the unilateral notice pathway available only before an answer or summary judgment motion — and voluntarily imposed a with-prejudice standard that the rule does not require. This suggests deliberate drafting, consistent with a negotiated outcome. No court order was necessary, and no merits findings were made. The with-prejudice language forecloses future claims by VDPP against Belkin on this patent, but does not bind third parties or affect the patent’s validity for other enforcement purposes.
US10021380B1 — multi-layered variable tint 3D spectacles state transitioning
US10021380B1 (application no. US15/907614) protects technology relating to faster state transitioning for continuous adjustable 3Deeps filter spectacles using multi-layered variable tint materials. The invention addresses a core performance challenge in active 3D eyewear: the speed and precision with which lens tint states can be switched in synchronisation with display refresh cycles. Multi-layered variable tint architectures allow finer gradation of optical states, which is material to image quality and viewer comfort in stereoscopic display systems.
This patent sits at the intersection of optics, consumer electronics, and display technology — a space that has seen sustained consolidation and cross-licensing activity as 3D display and AR/VR markets evolve. Any company developing or commercialising adaptive eyewear, switchable filter lenses, or display-synchronised optical accessories should assess whether their product architecture intersects with the claims of US10021380B1. The dismissal with prejudice protects Belkin specifically, but VDPP retains the right to enforce against other parties in the supply and distribution chain.
Should you run an FTO against US10021380B1?
If your company designs, manufactures, imports, or distributes adjustable optical filter eyewear, 3D spectacles, or display-synchronised lens accessories, US10021380B1 is a relevant risk asset. VDPP has demonstrated willingness to file infringement actions in the Central District of California, and the with-prejudice dismissal against Belkin does not extend protection to other parties. The patent remains active and enforceable against the market more broadly.
PatSnap Eureka’s FTO Search Agent can map your product’s technical architecture against the independent and dependent claims of US10021380B1, surface relevant prior art that may support a validity challenge, and flag any related continuation or family patents that could present additional exposure. Running this analysis now — before receiving a demand letter — is materially cheaper than responding to litigation.
Run a freedom-to-operate analysis on US10021380B1 to assess your product’s exposure
Run FTO in Eureka →Similar patent cases: 3D optics and display accessory litigation in C.D. Cal.
Explore comparable patent infringement actions involving display optics, variable tint, and 3D spectacles technology filed in the Central District of California.
What this case signals for the 3D display and optics IP landscape
An early with-prejudice exit by a patent assertion entity raises questions about patent strength and litigation strategy in the display accessories sector.
Early dismissal with prejudice is a red flag for patent assertion viability
When a PAE voluntarily dismisses with prejudice before the defendant even answers, it typically signals one of two things: a private settlement was reached, or the plaintiff assessed the litigation risk as too high to continue. Either scenario is relevant for other potential defendants facing VDPP assertions of US10021380B1.
Belkin’s defence posture — retaining Duane Morris — may have influenced the outcome
Belkin’s retention of Duane Morris, LLP, a firm with substantial IP litigation depth, likely raised the perceived cost and risk of continued proceedings for VDPP. Early engagement by well-resourced defence counsel is consistently associated with faster, more favourable resolution for defendants in PAE-initiated cases.
VDPP v Belkin — key questions answered
VDPP, LLC filed a patent infringement action against Belkin in the Central District of California on 26 July 2024, asserting US10021380B1. The case was voluntarily dismissed with prejudice by VDPP on 16 December 2024 — 143 days after filing — before Belkin filed an answer. Each party bore its own costs.
The with-prejudice dismissal permanently bars VDPP from re-asserting US10021380B1 against Belkin. It operates as a final judgment on the merits in Belkin’s favour on this specific patent, without any court ruling on validity or infringement. Belkin is effectively insulated from future claims by VDPP on this patent.
US10021380B1 covers faster state transitioning for continuous adjustable 3Deeps filter spectacles using multi-layered variable tint materials. The patent relates to the speed and precision of lens tint state switching in active 3D eyewear systems synchronised with display refresh cycles.
No. The with-prejudice dismissal protects only Belkin. US10021380B1 remains active and enforceable, and VDPP retains the right to assert it against other manufacturers, distributors, or importers of products that may fall within the patent’s claims. Other companies should assess their own FTO position independently.
The public record does not disclose the underlying reason. Possibilities include a private settlement (potentially including a licence or covenants not to sue), an assessment by VDPP that the case was commercially unviable to pursue, or a response to defence pressure from Belkin’s counsel at Duane Morris, LLP. The with-prejudice election was VDPP’s own — Rule 41(a)(1)(A)(i) does not require it.
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