The weekly litigation news digest is live. Subscribe now
The patent EP3272798 was granted to Asahi Kasei Kabushiki Kaisha on Apr 19, 2023. The application was filed on Mar 1, 2016 under application number EP16764415A. The patent is currently recorded with a legal status of "Opposition Rejected".

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.
| Company | Opposition Date | Representative | Opposition Status |
|---|---|---|---|
| EVONIK OPERATIONS | Jan 19, 2024 | F & E PATENT | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| EXAMINATION | US2011294910 |
| INTERNATIONAL-SEARCH-REPORT | JP2001198940 |
| INTERNATIONAL-SEARCH-REPORT | JP2008527133 |
| INTERNATIONAL-SEARCH-REPORT | JP2011105879 |
| INTERNATIONAL-SEARCH-REPORT | JP2013170221 |
| INTERNATIONAL-SEARCH-REPORT | JPS61268737 |
| INTERNATIONAL-SEARCH-REPORT | WO2011132680 |
| OPPOSITION | JP2003096228 |
| OPPOSITION | US2011294910 |
| OPPOSITION | US3855377 |
| OTHER | JPS61268737 |
| SEARCH | GB2058802 |
| SEARCH | JP2012040787 |
| SEARCH | JPH0774287B |
| SEARCH | US3855377 |
| SEARCH | WO2011134996 |
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
Sep 1, 2025
Sep 1, 2025
May 26, 2025
May 26, 2025
May 26, 2025
May 26, 2025
May 26, 2025
May 26, 2025
May 26, 2025
Means of redress
OPPO
May 26, 2025
May 26, 2025
May 15, 2025
May 15, 2025
May 9, 2025
May 8, 2025
May 8, 2025
May 8, 2025
Apr 10, 2025
Apr 7, 2025
Apr 7, 2025
Apr 7, 2025
Apr 7, 2025
Mar 27, 2025
Mar 21, 2025
Mar 21, 2025
Mar 21, 2025
Jul 2, 2024
Jul 2, 2024
Jul 2, 2024
Jul 2, 2024
Jul 2, 2024
Jul 2, 2024
Jul 2, 2024
Jun 6, 2024
Jun 3, 2024
Jun 3, 2024
Jun 3, 2024
Jun 3, 2024
Jun 3, 2024
Jun 3, 2024
Jun 3, 2024
Jun 3, 2024
Jun 3, 2024
Jun 3, 2024
Jun 3, 2024
Jun 3, 2024
Jun 3, 2024
Jun 3, 2024
Jun 3, 2024
Jun 3, 2024
Jun 3, 2024
Jun 3, 2024
Jun 3, 2024
Jun 3, 2024
Jun 3, 2024
Mar 13, 2024
Feb 2, 2024
Feb 2, 2024
Jan 25, 2024
Jan 19, 2024
Jan 19, 2024
Jan 19, 2024
Jan 19, 2024
Jan 19, 2024
Jan 19, 2024
Jan 19, 2024
Jan 19, 2024
Jan 19, 2024
Jan 19, 2024
Jan 19, 2024
Jan 19, 2024
Jan 19, 2024
May 4, 2023
Mar 23, 2023
Decision to grant a European patent
Search/Exam
Mar 15, 2023
Mar 14, 2023
Change to the inventor details
Search/Exam
Mar 9, 2023
(Electronic) Receipt
Search/Exam
Mar 9, 2023
Filing of the translations of the claims
Search/Exam
Mar 9, 2023
French translation of claims
Search/Exam
Mar 9, 2023
German translation of the claims
Search/Exam
Jan 12, 2023
Nov 10, 2022
Nov 10, 2022
Nov 10, 2022
Intention to grant (signatures)
Search/Exam
Nov 10, 2022
Text intended for grant (clean copy)
Search/Exam
Nov 10, 2022
Aug 31, 2022
(Electronic) Receipt
Search/Exam
Aug 31, 2022
Enquiry as to the processing of the file
Search/Exam
Aug 31, 2022
Letter accompanying subsequently filed items
Search/Exam
Apr 26, 2021
Decision to allow further processing
Search/Exam
Apr 15, 2021
(Electronic) Receipt
Search/Exam
Apr 15, 2021
Amended claims with annotations
Search/Exam
Apr 15, 2021
Annex
Search/Exam
Apr 15, 2021
Annex
Search/Exam
Apr 15, 2021
Claims
Search/Exam
Apr 15, 2021
Letter accompanying subsequently filed items
Search/Exam
Apr 15, 2021
Apr 15, 2021
Request for further processing
Search/Exam
Feb 5, 2021
Dec 18, 2020
Dec 8, 2020
Dec 1, 2020
Citation filed by a third party
Search/Exam
Dec 1, 2020
Non-patent literature filed by a third party
Search/Exam
Dec 1, 2020
Non-patent literature filed by a third party
Search/Exam
Dec 1, 2020
Observations by third parties
Search/Exam
Dec 1, 2020
Patent document filed by a Third party
Search/Exam
Oct 20, 2020
Annex to the communication
Search/Exam
Oct 20, 2020
Consultation by telephone/in person
Search/Exam
Oct 20, 2020
Oct 8, 2020
Oct 1, 2020
(Electronic) Receipt
Search/Exam
Oct 1, 2020
Aug 31, 2020
Annex to the communication
Search/Exam
Aug 31, 2020
Consultation by telephone/in person
Search/Exam
Aug 31, 2020
Jun 5, 2020
Annex to the communication
Search/Exam
Jun 5, 2020
Communication from the Examining Division
Search/Exam
May 19, 2020
(Electronic) Receipt
Search/Exam
May 19, 2020
Amended claims with annotations
Search/Exam
May 19, 2020
Amended description with annotations
Search/Exam
May 19, 2020
Annex
Search/Exam
May 19, 2020
Claims
Search/Exam
May 19, 2020
Description
Search/Exam
May 19, 2020
Letter accompanying subsequently filed items
Search/Exam
May 19, 2020
Apr 1, 2020
Mar 25, 2020
(Electronic) Receipt
Search/Exam
Mar 25, 2020
Nov 27, 2019
Annex to the communication
Search/Exam
Nov 27, 2019
Communication from the Examining Division
Search/Exam
Sep 27, 2019
(Electronic) Receipt
Search/Exam
Sep 27, 2019
Annex
Search/Exam
Sep 27, 2019
Letter accompanying subsequently filed items
Search/Exam
Sep 27, 2019
Jul 25, 2019
Jul 18, 2019
(Electronic) Receipt
Search/Exam
Jul 18, 2019
Mar 20, 2019
Annex to the communication
Search/Exam
Mar 20, 2019
Communication from the Examining Division
Search/Exam
Mar 8, 2019
(Electronic) Receipt
Search/Exam
Mar 8, 2019
Amended claims with annotations
Search/Exam
Mar 8, 2019
Amended description with annotations
Search/Exam
Mar 8, 2019
Claims
Search/Exam
Mar 8, 2019
Description
Search/Exam
Mar 8, 2019
Letter accompanying subsequently filed items
Search/Exam
Mar 8, 2019
Nov 7, 2018
Annex to the communication
Search/Exam
Nov 7, 2018
Communication from the Examining Division
Search/Exam
Oct 17, 2018
(Electronic) Receipt
Search/Exam
Oct 17, 2018
Amended claims with annotations
Search/Exam
Oct 17, 2018
Amended description with annotations
Search/Exam
Oct 17, 2018
Claims
Search/Exam
Oct 17, 2018
Description
Search/Exam
Oct 17, 2018
Letter accompanying subsequently filed items
Search/Exam
Oct 17, 2018
Jun 8, 2018
Annex to the communication
Search/Exam
Jun 8, 2018
Communication from the Examining Division
Search/Exam
May 11, 2018
(Electronic) Receipt
Search/Exam
May 11, 2018
Letter accompanying subsequently filed items
Search/Exam
May 11, 2018
Jan 16, 2018
Annex to the communication
Search/Exam
Jan 16, 2018
Communication from the Examining Division
Search/Exam
Jan 4, 2018
Notification of forthcoming publication
Search/Exam
Nov 9, 2017
Nov 9, 2017
Information on Search Strategy
Search/Exam
Nov 9, 2017
Supplementary European search report
Search/Exam
Oct 27, 2017
Search started
Search/Exam
Oct 23, 2017
Communication to designated inventor
Search/Exam
Oct 23, 2017
Communication to designated inventor
Search/Exam
Oct 2, 2017
Oct 2, 2017
Sep 8, 2017
(Electronic) Receipt
Search/Exam
Sep 8, 2017
Abstract
Search/Exam
Sep 8, 2017
Claims
Search/Exam
Sep 8, 2017
Description
Search/Exam
Sep 8, 2017
Request for entry into the European phase
Search/Exam
Jul 26, 2017
Information on entry into European phase
Search/Exam
Oct 12, 2016
Sep 22, 2016
Copy of the international search report
Search/Exam
Sep 22, 2016
Sep 22, 2016
International publication pamphlet
Search/Exam