The weekly litigation news digest is live. Subscribe now

IP Verse

Polycarbonate Diol - EP3936551

The patent EP3936551 was granted to Asahi Kasei Kabushiki Kaisha on Jun 15, 2022. The application was filed on Feb 20, 2020 under application number EP20767117A. The patent is currently recorded with a legal status of "Revoked".

EP3936551

ASAHI KASEI KABUSHIKI KAISHA
Application Number
EP20767117A
Filing Date
Feb 20, 2020
Status
Revoked
Mar 21, 2025
Publication Date
Jun 15, 2022
External Links
Slate, Register, Google Patents

Patent Summary

Patent Family

Patent Family

Patent Oppositions

Patent oppositions filed by competitors challenge the validity of a granted patent. These oppositions are typically based on claims of prior art, lack of novelty, or non-obviousness. They are a key part of the process for determining a patent's strength and enforceability.

CompanyOpposition DateRepresentativeOpposition Status
HAMMERMar 15, 2023GRUNECKER PATENTADMISSIBLE

Patent Citations (18) New

Patent citations refer to prior patents cited during different phases such as opposition or international search.

Citation PhasePublication Number
DESCRIPTIONJP2019039374
DESCRIPTIONJPS5013159B
DESCRIPTIONJPS6252070B
DESCRIPTIONUS5070173
DESCRIPTIONWO2015194670
INTERNATIONAL-SEARCH-REPORTJP2013216841
INTERNATIONAL-SEARCH-REPORTJP2015143216
INTERNATIONAL-SEARCH-REPORTWO2015016261
INTERNATIONAL-SEARCH-REPORTWO2018190280
OPPOSITIONEP0601571
OPPOSITIONJP2015143216
OPPOSITIONJP2019039374
OPPOSITIONWO2006037957
OPPOSITIONWO2008098621
OPPOSITIONWO2016026726
SEARCHEP2559718
SEARCHEP3159366
SEARCHJP2007154070

Dossier Documents

The dossier documents provide a comprehensive record of the patent's prosecution history - including filings, correspondence, and decisions made by patent offices - and are crucial for understanding the patent's legal journey and any challenges it may have faced during examination.

  • Date

    Description

  • Get instant alerts for new documents