Huang v. Tetramem: ReRAM Patent Infringement Case Dismissed Without Prejudice
Individual inventor Xiaohua Huang filed suit against Tetramem Inc. in the Northern District of California, asserting reissue patent USRE045259E covering ReRAM integrated circuit technology. The case was voluntarily dismissed without prejudice in 132 days — leaving the door open for refiling.
Swift voluntary exit in a reissue patent fight over ReRAM chip IP
On 26 September 2023, individual inventor Xiaohua Huang filed an infringement action against Tetramem Inc. in the U.S. District Court for the Northern District of California, presided over by Chief Judge Susan van Keulen. The suit centred on reissue patent USRE045259E — derived from application US13/355449 — which covers ReRAM (resistive random-access memory) IP and integrated circuits. Tetramem, a semiconductor company developing neuromorphic and analog in-memory computing products, was named as the sole defendant.
On 5 February 2024, Huang filed a notice of voluntary dismissal under Federal Rule of Civil Procedure 41(a)(1)(A)(i), withdrawing his complaint and dismissing the case against Tetramem without prejudice. Because dismissal occurred under Rule 41(a)(1)(A)(i) — before Tetramem served an answer or motion for summary judgment — no court order was required, and the case closed automatically upon filing of the notice. Tetramem’s counsel, Kramer Levin Naftalis & Frankel LLP, represented the defendant throughout the brief proceeding.
At 132 days from filing to closure, the case resolved significantly faster than the median patent infringement matter at the district court level, which typically spans multiple years. The precise reasons for early withdrawal are not stated in the public record, though early voluntary dismissals of this type often suggest ongoing licensing negotiations, a reassessment of claim scope following initial review, or strategic repositioning ahead of a potential refiling. Because dismissal is without prejudice, Huang is not barred from asserting USRE045259E against Tetramem again.
Filing to voluntary dismissal in 132 days
132 days — resolved faster than most patent infringement cases at first instance
Voluntarily dismissed without prejudice — what this means for both parties
Rule 41(a)(1)(A)(i) — dismissal as of right, no court order needed
Federal Rule of Civil Procedure 41(a)(1)(A)(i) permits a plaintiff to dismiss a case unilaterally — without a court order — provided the defendant has not yet served an answer or a motion for summary judgment. Here, Huang invoked this rule directly, meaning the dismissal took immediate effect upon filing. Tetramem had no standing to contest or condition the withdrawal at that procedural stage.
Plaintiff-initiated exitWithout prejudice: refiling remains available to Huang
A dismissal without prejudice does not adjudicate the merits of the infringement claims. Huang retains the right to refile the same claims against Tetramem in the future, subject to applicable statutes of limitation. This contrasts with a dismissal with prejudice, which would permanently bar re-assertion. The public record does not disclose whether any settlement, licence, or other agreement underpins the withdrawal — that remains unknown.
Refiling not barredUSRE045259E is a reissued patent — broader or corrected claim scope
Reissue patents arise when a patentee seeks to correct errors in an originally granted patent, often to broaden or clarify claim scope. USRE045259E represents a reissued version of the underlying application US13/355449. In litigation, reissue patents can present additional validity arguments for defendants, as the reissue prosecution history becomes relevant to claim construction and prosecution history estoppel analysis.
Reissue scope riskNo fee award recorded — cost-free exit for Tetramem on the record
Because Huang dismissed under Rule 41(a)(1)(A)(i) before Tetramem filed a responsive pleading, no costs or attorneys’ fees appear to have been awarded in the public docket. While prevailing defendants can sometimes seek fees under 35 U.S.C. § 285 in exceptional cases, the pre-answer stage of this dismissal and its without-prejudice nature would likely complicate any such application. The public record records no fee motion or award.
No fee award on recordFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Xiaohua Huang | Company | Individual inventor — holder of reissue patent USRE045259E covering ReRAM IC technologySearch in Eureka ↗ |
| Defendant | Tetramem, Inc. | Company | Tetramem Inc. — semiconductor company focused on ReRAM-based neuromorphic and analog in-memory computing chipsSearch in Eureka ↗ |
| Plaintiff counsel | Xiaohua Huang. | Attorney | Counsel for Xiaohua HuangSearch in Eureka ↗ |
| Defendant counsel | James R. Hannah | Attorney | Counsel for Tetramem, Inc.Search in Eureka ↗ |
| Presiding judge | Judge Susan van Keulen | Chief Judge | California Northern District Court — Chief JudgeSearch in Eureka ↗ |
Stipulation of dismissal — official text
The dismissal notice invokes Rule 41(a)(1)(A)(i), the most unilateral form of voluntary withdrawal available under the Federal Rules — requiring no judicial approval and taking effect instantly. The explicit ‘without prejudice’ designation means no merits determination was made and Huang’s infringement claims survive for potential reassertion. The phrasing ‘respectfully submits this notice to withdraw his complaint’ is standard formulaic language and provides no insight into whether a settlement, licence, or strategic reassessment drove the decision.
USRE045259E — Reissued Patent Covering ReRAM Integrated Circuit Technology
USRE045259E is a United States reissue patent derived from application number US13/355449, covering ReRAM (resistive random-access memory) IP and integrated circuits. Reissue patents are granted by the USPTO when the original patent is deemed wholly or partly inoperative or invalid, allowing the patentee to correct errors or broaden claims within the statutory two-year window for broadening reissues. The underlying technology relates to resistive memory architectures — a class of non-volatile memory with strong commercial interest in edge AI, neuromorphic computing, and high-density storage applications.
ReRAM technology sits at the intersection of advanced memory design and analog computing, making it strategically valuable across a growing range of semiconductor product categories. Tetramem’s focus on analog in-memory computing — which directly leverages resistive switching device physics — places it squarely within the claim landscape that a ReRAM-focused reissue patent might target. For competitors developing similar memory-integrated chip architectures, USRE045259E represents a patent warranting close monitoring, particularly given that reissued claims may have broader coverage than the original grant.
Should your ReRAM or analog in-memory product be cleared against USRE045259E?
Any R&D or product team commercialising ReRAM devices, resistive crossbar arrays, or analog in-memory computing chips should consider a freedom-to-operate review against USRE045259E. The patent’s reissue status means its claims may cover implementations that the original grant did not explicitly address. Companies in the neuromorphic computing, edge AI inference, and embedded non-volatile memory spaces are particularly exposed — especially those whose architectures rely on resistive switching memory cells in integrated circuit form.
PatSnap Eureka’s FTO Search Agent allows IP and product teams to map the claims of USRE045259E against your specific device architecture, flag potentially blocking claims, and identify prior art relevant to validity challenges. Eureka’s claim monitoring tools can also alert you to any continuation applications, reissue amendments, or new assignments associated with this patent family — ensuring your FTO remains current as the IP landscape around ReRAM technology evolves.
Run a freedom-to-operate analysis on USRE045259E to assess your product’s exposure
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What this case signals for the ReRAM and neuromorphic chip IP landscape
A reissue patent assertion against a specialist ReRAM chip company, withdrawn before answer — this pattern warrants attention across the memory semiconductor sector.
Reissue patents in semiconductor IP carry elevated litigation risk
USRE045259E is a reissue patent — a category that signals the patentee sought expanded or corrected claim coverage post-grant. Companies developing ReRAM, MRAM, or other emerging memory technologies should treat reissue patents in this space as a priority FTO target. Claim scope in reissued patents can extend materially beyond the original grant.
Without-prejudice dismissal is not the end — monitor for refiling
Huang retains full standing to refile against Tetramem or assert USRE045259E against other ReRAM chip developers. Competitors and IP teams should track this patent for new assignments, continuations, or subsequent litigation filings. A 132-day first action that ends without prejudice is consistent with a negotiating posture or pre-litigation positioning.
Xiaohua v Tetramem — key questions answered
Xiaohua Huang filed a patent infringement action against Tetramem Inc. in the Northern District of California on 26 September 2023, asserting reissue patent USRE045259E covering ReRAM integrated circuit technology. Huang voluntarily dismissed the case without prejudice on 5 February 2024 under Fed. R. Civ. P. 41(a)(1)(A)(i), 132 days after filing.
Dismissal without prejudice means the court made no ruling on the merits of Huang’s infringement claims. Huang retains the right to refile the same claims against Tetramem in the future. This contrasts with a dismissal with prejudice, which would permanently bar re-assertion. The public record does not disclose whether a settlement or licence agreement accompanied the withdrawal.
USRE045259E is a United States reissue patent derived from application US13/355449. It covers ReRAM (resistive random-access memory) IP and integrated circuits. Reissue patents are granted to correct errors or broaden claims in an originally granted patent. The technology relates to resistive memory architectures relevant to neuromorphic computing, edge AI, and non-volatile memory applications.
The public record does not disclose the reason for early voluntary dismissal. Cases resolved at this early stage — before the defendant files an answer — are sometimes consistent with ongoing licensing negotiations, a reassessment of claim scope, or strategic repositioning before a potential refiling. No settlement terms, licence, or fee award appear on the public docket.
Rule 41(a)(1)(A)(i) permits a plaintiff to voluntarily dismiss a case without a court order, provided the defendant has not yet served an answer or motion for summary judgment. Huang invoked this rule, meaning dismissal took effect automatically upon filing of the notice. No judicial approval was required and Tetramem had no procedural standing to oppose the withdrawal at that stage.
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