Safe IP v. Grammarly: Plagiarism Detection Patent Case Terminated After 1,228 Days
Safe IP, LLC filed suit against Grammarly, Inc. in the District of Delaware asserting US9043375B2, a patent covering plagiarism detection systems. The case was part of a coordinated multi-case filing and was terminated after 1,228 days, with the record silent on a merits adjudication.
Coordinated patent filing against Grammarly ends without merits ruling
Safe IP, LLC filed this infringement action on 11 July 2022 in the District of Delaware before Judge Colm F. Connolly, asserting US9043375B2 against Grammarly, Inc. The patent, carrying application number US12/253249, covers plagiarism detection system technology — a domain directly relevant to Grammarly’s commercial AI writing and grammar-assistance platform. The case was one of at least three coordinated filings by Safe IP on the same day, with companion cases 1:22-cv-00918 and 1:22-cv-00920 filed concurrently against related or separate defendants.
The case was stayed relatively early: on 22 November 2022, the court entered an order staying the case and terminating a scheduled evidentiary hearing that had been set for 30 November 2022. The stay order covered all three companion cases simultaneously, suggesting a systemic procedural development — potentially related to Judge Connolly’s standing orders on third-party litigation funding disclosures, which were active at the time and affected numerous NPE cases in Delaware. The case formally closed on 20 November 2025, though the basis of termination is recorded simply as ‘Case Terminated’ without specifying settlement, voluntary dismissal, or a merits judgment.
The 1,228-day duration between filing and closure is notable given the early stay, suggesting the case remained in a dormant or administrative posture for the majority of its life. The public record does not disclose whether any financial consideration changed hands or whether the termination reflects a strategic withdrawal. The coordinated multi-case structure, combined with the rapid stay and the NPE profile of Safe IP, LLC, is consistent with a licensing-focused enforcement strategy. What drove the ultimate closure — and whether Grammarly obtained any licence or release — is not determinable from available public records.
Filing to Case Terminated in 1228 days
1,228 days — above the median for D. Del. patent cases, suggesting procedural complexity
Case terminated: what the record does and does not tell us
Case terminated without a recorded merits disposition
The docket records ‘Case Terminated’ as the basis of closure, which is a procedural label rather than a substantive outcome. It does not equate to a judgment on infringement, validity, or damages. The early stay order in November 2022 — which simultaneously affected three companion cases — suggests the termination may have followed an extended period of administrative dormancy rather than active litigation leading to a decision.
No merits adjudicationOutcome for Safe IP is ambiguous from the public record
The basis of termination does not specify voluntary dismissal with or without prejudice, settlement, or a consent judgment. The public record is therefore silent on whether Safe IP obtained any licensing revenue, royalty, or other consideration from Grammarly. The absence of a with-prejudice dismissal notation means the enforceability of US9043375B2 against third parties is not formally constrained by this case’s outcome alone.
Record silent on considerationGrammarly avoided a merits finding — but exposure is unresolved publicly
Grammarly was represented by Shaw Keller LLP and Nathan Roger Hoeschen. The termination without a recorded merits ruling means no court has publicly adjudicated whether Grammarly’s plagiarism detection features infringe US9043375B2. Whether any covenant not to sue or licence was obtained as part of the closure is not reflected in the docket, leaving the public posture of Grammarly’s freedom to operate under this patent uncertain.
No infringement finding recordedPatent remains a live risk for NLP and text-analysis product teams
US9043375B2 covers plagiarism detection technology — a field now central to AI writing tools, large language model output checkers, and academic integrity platforms. The absence of an invalidity or non-infringement ruling means the patent survived this case with its enforceability intact. Competitors and adjacent-technology firms in the AI content and text-analysis space should treat this patent as unresolved and consider FTO analysis before product launches in the plagiarism or originality-detection domain.
Patent enforceability unresolvedFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Safe IP, LLC | Company | Patent assertion entity — holder of US9043375B2 covering plagiarism detection systemsSearch in Eureka ↗ |
| Defendant | Grammarly, Inc. | Company | Grammarly, Inc. — AI-powered writing assistance and grammar-checking platformSearch in Eureka ↗ |
| Plaintiff counsel | Jimmy C. Chong | Attorney | Counsel for Safe IP, LLCSearch in Eureka ↗ |
| Plaintiff counsel | William P. Ramey , III | Attorney | Counsel for Safe IP, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Chong Law Firm PA | Law Firm | Representing Safe IP, LLCSearch in Eureka ↗ |
| Defendant counsel | Nathan Roger Hoeschen | Attorney | Counsel for Grammarly, Inc.Search in Eureka ↗ |
| Defendant law firm | Shaw Keller LLP | Law Firm | Representing Grammarly, Inc.Search in Eureka ↗ |
| Presiding judge | Judge Colm F. Connolly | Judge | Delaware District CourtSearch in Eureka ↗ |
Official order — verbatim text
The docket entry records the termination of a scheduled evidentiary hearing and the imposition of a stay across three companion cases in November 2022. This procedural entry does not constitute a verdict on infringement or validity. The formal ‘Case Terminated’ basis entered upon closure in November 2025 likewise carries no merits content. The record as a whole is consistent with a case that was administratively resolved — whether by settlement, withdrawal, or attrition — without any judicial determination on the substantive patent claims.
US9043375B2 — Plagiarism Detection System Technology
US9043375B2, filed under application number US12/253249, protects technology in the plagiarism detection domain — specifically systems and methods for identifying copied or substantially similar textual content. This class of invention sits at the intersection of natural language processing, information retrieval, and text-similarity analysis. The patent’s claims are relevant to any product that ingests user-submitted text and compares it against a corpus to detect non-original content — a description that maps directly to features deployed by academic platforms, writing assistants, and increasingly by AI content governance tools.
The commercial significance of US9043375B2 has grown since its filing, as AI writing tools have expanded the scope of what constitutes originality detection. Grammarly’s platform, which assists users with drafting and editing, plausibly overlaps with plagiarism-detection functionality at the feature level. More broadly, the rise of LLM-generated content has driven a new class of AI output detection products — tools that analyse text for signs of machine authorship — which may fall within reading of plagiarism-detection claims depending on how broadly the patent’s claims are construed. Any firm in the AI text-analysis, academic integrity, or content governance sector should conduct independent claim mapping before product launch.
Should your team run an FTO against US9043375B2?
If your product performs any form of automated text similarity analysis, originality scoring, or plagiarism detection — including AI-generated content detection — US9043375B2 should be on your FTO radar. The patent survived this litigation without an invalidity ruling, meaning its claims remain presumptively valid. Safe IP’s demonstrated willingness to assert the patent against a high-profile defendant like Grammarly suggests enforcement capacity. Product teams at edtech firms, writing platforms, LLM providers, and academic integrity vendors face the highest exposure.
PatSnap Eureka’s FTO Search Agent can map the claims of US9043375B2 against your product’s technical architecture in minutes, surfacing prior art, claim scope analysis, and comparable cases. Use Eureka to identify whether your text-comparison pipeline, similarity scoring algorithm, or corpus-matching logic intersects with the asserted claims — before you ship. Monitoring Safe IP’s related portfolio and prosecution history is also available through Eureka’s assignee tracking features.
Run a freedom-to-operate analysis on US9043375B2 to assess your product’s exposure
Run FTO in Eureka →Similar plagiarism detection and NLP patent cases in D. Delaware
Cases asserting text-analysis and plagiarism detection patents before the Delaware District Court, including coordinated NPE enforcement actions in the NLP sector.
What this case signals for the AI writing and NLP patent landscape
Safe IP’s coordinated multi-case strategy against Grammarly highlights rising NPE activity targeting AI-powered text-analysis products.
Coordinated NPE filings signal systematic enforcement campaigns
The simultaneous filing of three related cases in D. Del. on the same day is consistent with a licensing campaign rather than a dispute-resolution strategy. Product teams and in-house counsel in the AI writing and grammar-technology sector should monitor Safe IP’s portfolio for further assertion activity, particularly as LLM-based content tools proliferate.
Early stay orders in D. Del. can extend case lifespans dramatically
The stay entered just four months after filing — and covering all companion cases simultaneously — is consistent with Judge Connolly’s disclosure-focused case management orders in the 2022–2023 period. IP teams should account for the possibility that D. Del. NPE cases may be administratively dormant for years before formal termination, complicating FTO assessments.
Safe v Grammarly — key questions answered
The case was terminated on 20 November 2025 after 1,228 days. The docket records ‘Case Terminated’ as the basis of closure but does not specify a merits ruling, settlement, or voluntary dismissal. The case was stayed in November 2022, shortly after filing.
Safe IP asserted US9043375B2, filed under application number US12/253249, which covers plagiarism detection system technology. The patent relates to automated text comparison and similarity analysis methods relevant to Grammarly’s writing assistance platform.
The stay was entered in November 2022, approximately four months after filing, and covered three companion cases simultaneously. The public record does not specify the reason, but it is consistent with Judge Connolly’s active case management orders in D. Del. during that period, which required disclosure of third-party litigation funding arrangements in NPE cases.
No. The case closed without any recorded merits determination on infringement, validity, or damages. The ‘Case Terminated’ basis of termination is a procedural notation and does not reflect a judicial finding on the substantive patent claims of US9043375B2.
The termination without a with-prejudice dismissal or invalidity ruling means US9043375B2 remains presumptively valid and enforceable. Companies in the text-analysis, plagiarism detection, and AI content governance space cannot rely on this case’s closure as a clearance. An independent FTO analysis against the patent’s claims is advisable.
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