VDPP LLC v. NEC: Variable-Tint 3D Spectacles Patents Dismissed Without Prejudice
VDPP, LLC asserted two patents covering continuous adjustable 3Deeps filter spectacles against NEC in the Northern District of Texas. After 82 days and before NEC answered, VDPP voluntarily dismissed all claims without prejudice — explicitly preserving its right to re-assert both patents.
Pre-Answer Voluntary Exit: VDPP Keeps Its Powder Dry Against NEC
On 7 March 2024, VDPP, LLC — a patent assertion entity holding IP relating to adjustable 3D filter spectacles — filed an infringement action against NEC in the Northern District of Texas before Judge Ada Brown. The suit asserted two patents, US9426452B2 and US9948922B2, both directed at faster state-transitioning variable-tint multi-layered materials used in continuous adjustable 3Deeps filter spectacles technology. NEC was represented by Jones Day, while VDPP engaged Kirby Drake Law PLLC and Ramey LLP.
On 28 May 2024 — just 82 days after filing — VDPP invoked Federal Rule 41(a)(1)(A)(i) to voluntarily dismiss all claims. Critically, this mechanism is only available before the defendant has answered or filed a motion for summary judgment, and the dismissal was expressly designated without prejudice as to the asserted patents. Each party was ordered to bear its own costs, expenses, and attorneys’ fees, meaning no economic sanction was imposed on either side.
The speed of resolution — before NEC even filed a substantive response — suggests VDPP may have been re-evaluating litigation strategy, pursuing settlement discussions that did not materialise, or repositioning to refile in a different venue or on revised claim theories. The public record does not reveal whether any commercial terms were agreed privately. Because the dismissal is without prejudice, both patents remain live litigation assets and NEC or other defendants in adjacent markets should treat this case as unresolved rather than concluded.
Filing to Voluntary dismissal in 82 days
82 days — resolved before defendant answered, well below median district court litigation timelines
Voluntarily dismissed without prejudice: what the exit terms mean for both parties
Rule 41(a)(1)(A)(i): plaintiff’s unilateral right to exit
Federal Rule 41(a)(1)(A)(i) permits a plaintiff to dismiss an action without a court order — and without the defendant’s consent — provided the defendant has not yet answered or moved for summary judgment. VDPP exercised this right 82 days in. The rule operates as a matter of right, meaning no judicial approval was required and no merits finding was made. The case ended procedurally, not substantively.
No merits adjudicationWithout prejudice means the patents stay live for future enforcement
A dismissal without prejudice does not extinguish the underlying claims. VDPP explicitly stated the dismissal is without prejudice ‘as to the asserted patent,’ preserving the right to refile against NEC or other parties on US9426452B2 and US9948922B2. NEC has not obtained any covenant not to sue, invalidity ruling, or non-infringement finding. For product teams and competitors in the 3D eyewear space, these patents remain active enforcement risks.
Patents remain enforceableNEC escapes this action — but faces no legal shield going forward
NEC achieved dismissal before incurring the cost of answering, but it secured no dispositive protection. There is no invalidity finding, no non-infringement declaration, and no estoppel barring VDPP from filing again. The absence of a fee-shifting award also means NEC received no economic deterrent against a repeat filing. Future exposure on the same patents, or against successor defendants in NEC’s supply chain, cannot be ruled out based on the public record.
No preclusion for NEC3D eyewear IP remains contested territory — market participants take note
The variable-tint 3D spectacles segment sits at the intersection of display technology, optical materials science, and consumer electronics — all areas where patent assertion activity is elevated. VDPP’s decision to preserve its claims rather than accept a permanent resolution suggests continued monetisation intent. Companies developing multi-layered variable-tint eyewear, active shutter glasses, or related display peripherals should monitor both US9426452B2 and US9948922B2 for refilings or new assertion campaigns.
Monitor for refiling riskFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | VDPP, LLC | Company | Patent assertion entity — holder of US9426452B2 and US9948922B2 covering 3D filter spectaclesSearch in Eureka ↗ |
| Defendant | NEC | Individual | NEC — multinational technology corporation defended by Jones DaySearch in Eureka ↗ |
| Plaintiff counsel | Jeffrey E. Kubiak | Attorney | Counsel for VDPP, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Kirby Blair Drake | Attorney | Counsel for VDPP, LLCSearch in Eureka ↗ |
| Plaintiff counsel | William P. Ramey , III | Attorney | Counsel for VDPP, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Kirby Drake Law PLLC | Law Firm | Representing VDPP, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Ramey LLP | Law Firm | Representing VDPP, LLCSearch in Eureka ↗ |
| Defendant counsel | Keith Bryan Davis | Attorney | Counsel for NECSearch in Eureka ↗ |
| Defendant law firm | Jones Day | Law Firm | Representing NECSearch in Eureka ↗ |
| Presiding judge | Judge Ada Brown | Judge | Texas Northern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The dismissal notice expressly invokes Rule 41(a)(1)(A)(i) and designates the exit as without prejudice ‘as to the asserted patent’ — language that signals VDPP’s deliberate preservation of future enforcement rights. No claim construction, validity finding, or infringement determination was reached. The cost-bearing provision — each party pays its own — is standard for a pre-answer voluntary exit and does not reflect any merits assessment by the court. NEC has not obtained any legal protection against a subsequent action on the same patents.
US9426452B2 & US9948922B2 — Variable-Tint 3D Filter Spectacles Technology
US9426452B2 (application US14/850750) and US9948922B2 (application US15/683623) both relate to continuous adjustable 3Deeps filter spectacles — a technology enabling faster state transitioning through multi-layered variable tint optical materials. The patents sit within the domain of active optical eyewear, addressing the speed and precision with which lens elements can shift between transmission states, a critical performance parameter in 3D display environments where frame-synchronised filtering is required.
The commercial significance of these patents lies in their potential reach across any product category using electronically or optically controlled variable-tint lens layers — including active shutter 3D glasses, adaptive AR/VR eyewear, and photochromic display peripherals. As display refresh rates increase and immersive media formats expand, patents covering precise optical state-switching mechanisms carry growing strategic value. VDPP’s decision to retain these patents in live enforcement posture — rather than settling or abandoning claims — suggests confidence in their scope and validity.
Should you run an FTO analysis against US9426452B2 and US9948922B2?
Any organisation designing or commercialising products that incorporate multi-layered variable-tint optical elements — including 3D spectacles, active shutter eyewear, adaptive lenses, or related display peripherals — should assess freedom to operate against both VDPP patents. The without-prejudice dismissal in this case means both patents are in active enforcement posture. VDPP has explicitly preserved its right to refile, and no invalidity or non-infringement ruling exists to rely on.
PatSnap Eureka’s FTO Search Agent can map the claim language of US9426452B2 and US9948922B2 against your product architecture, surface relevant prior art that could support an invalidity argument, and identify continuation or related applications in VDPP’s portfolio that may present additional risk. Running this analysis before any refiling is filed against your organisation maximises your options and minimises reactive litigation costs.
Run a freedom-to-operate analysis on US9426452B2 to assess your product’s exposure
Run FTO in Eureka →Similar Patent Cases: 3D Eyewear & Variable-Tint Optical Technology
Cases involving variable-tint optical eyewear and 3D display patent assertions in the Northern District of Texas and related federal courts.
What this case signals for the 3D display and optical eyewear IP landscape
A pre-answer voluntary exit by a patent assertion entity rarely signals the end. It more often marks a tactical pause.
Pre-answer dismissals preserve optionality — treat them as deferred threats
When a plaintiff exits under Rule 41(a)(1)(A)(i) before the defendant answers, no merits analysis has occurred. VDPP retains full ability to refile against NEC or any other party on US9426452B2 and US9948922B2. In-house teams at display and eyewear companies should flag this case as open risk, not closed matter.
Jones Day’s early presence may have influenced the timeline
NEC’s retention of Jones Day — a firm with a strong track record in complex IP disputes — from the outset may have signalled a credible defence posture. PAEs sometimes reassess litigation economics when faced with well-resourced defence counsel. The 82-day timeline and pre-answer exit is consistent with that dynamic, though the public record does not confirm it.
VDPP v NEC — key questions answered
The dismissal without prejudice means VDPP retains the right to refile infringement claims against NEC or other defendants on US9426452B2 and US9948922B2. No merits determination was made — no invalidity, non-infringement, or claim construction ruling exists. NEC has no legal preclusion against a subsequent action. The public record does not disclose whether any private settlement or licensing terms were reached.
Rule 41(a)(1)(A)(i) permits a plaintiff to voluntarily dismiss without court order before the defendant has answered or moved for summary judgment. VDPP filed the notice 82 days in, before NEC submitted an answer, making this mechanism available as of right. The rule allows plaintiffs to exit without prejudice and without judicial approval, preserving full enforcement optionality on the asserted patents.
Both patents relate to continuous adjustable 3Deeps filter spectacles — specifically, faster state transitioning achieved through multi-layered variable tint materials. The technology addresses the speed and precision of optical state switching in 3D display eyewear, a performance-critical function where lens elements must synchronise with display frame rates. The patents may have broader applicability to adaptive optical and AR/VR eyewear products.
NEC was represented by attorney Keith Bryan Davis of Jones Day. Jones Day is a major international law firm with significant patent litigation capability. VDPP was represented by Jeffrey E. Kubiak, Kirby Blair Drake, and William P. Ramey III, through Kirby Drake Law PLLC and Ramey LLP — the latter known for high-volume patent assertion activity.
The case was dismissed voluntarily by VDPP before NEC answered, so NEC did not obtain a court ruling in its favour. While NEC avoided further litigation costs in this action, it received no invalidity finding, no non-infringement declaration, and no covenant not to sue. The dismissal without prejudice means VDPP could refile the same claims. Commercially, NEC’s exposure on US9426452B2 and US9948922B2 remains unresolved.
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