IP Verse

Eisai competitive analysis

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Latest patents of Eisai opposed by its competitors

Explore Eisai's recently opposed patents, revealing key competitive challenges and strategic patent disputes in the industry. Track oppositions filed by competitors to understand technology battlegrounds and assess potential risks.

Last updated on: Oct 23, 2025
Patent NumberGrant DateTitleTotal Oppositions
EP3581183
Nov 29, 2023Tumor-Treating Pharmaceutical Composition1
EP3263106
Oct 25, 2023Method For Suppressing Bitterness Of Quinoline Derivative8
EP3524595
Aug 10, 2022High-Purity Quinoline Derivative And Method For Manufacturing Same10
EP3265122
May 4, 2022Combination Of A Pd-1 Antagonist And Eribulin For Treating Cancer4
EP3338779
Jun 30, 2021Tumor Therapeutic Agent1

Latest publications and patents of Eisai New

Explore the latest publications and patents granted to Eisai, showcasing their recent innovations and technological advancements.

Last updated on: Oct 18, 2025
Publication NumberPublication DateTitleLegal Status

Get instant update for new patents of Eisai

EP3581183
Nov 29, 2023Tumor-Treating Pharmaceutical CompositionGranted And Under Opposition
EP3263106
Oct 25, 2023Method For Suppressing Bitterness Of Quinoline DerivativeGranted And Under Opposition
EP3524595
Aug 10, 2022High-Purity Quinoline Derivative And Method For Manufacturing SameGranted And Under Opposition
EP3265122
May 4, 2022Combination Of A Pd-1 Antagonist And Eribulin For Treating CancerRevoked
EP3338779
Jun 30, 2021Tumor Therapeutic AgentRevoked
EP2452684
Jan 24, 2018MicellesNo Opposition Filed Within Time Limit

Latest PTAB cases involving Eisai

Discover the latest PTAB cases involving Eisai, highlighting their recent legal challenges and patent disputes.

Last updated on: Oct 24, 2025
Proceeding NumberFiling DatePetitionerRespondentStatus

Get alerts for PTAB Cases involving Eisai

PGR2021-00047Feb 3, 2021EISAICRYSTAL PHARMACEUTICAL SUZHOUFinal Written Decision

Peer Comparison New

IP litigation analysis comparing Eisai with top 3 competitors. Includes complete PTAB case data and opposition data from 2018 onwards.

Last updated on: Oct 23, 2025
CompanyOppositions FiledOppositions FacedPTAB Cases FiledPTAB Cases Faced
EISAI - - 1 -
CRYSTAL PHARMACEUTICAL SUZHOU - 1 - 1