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The patent EP2160357 was granted to Anan Kasei on Jul 21, 2021. The application was filed on Jun 20, 2008 under application number EP08765842A. The patent is currently recorded with a legal status of "Granted And Under Opposition".

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 |
|---|---|---|---|
| NEO CHEMICALS & OXIDES EUROPE | Apr 20, 2022 | BIRD & BIRD | - |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | EP0444470 |
| DESCRIPTION | EP1484282 |
| DESCRIPTION | FR2570087 |
| DESCRIPTION | US490685 |
| INTERNATIONAL-SEARCH-REPORT | JP2006256911 |
| INTERNATIONAL-SEARCH-REPORT | JP2007022836 |
| INTERNATIONAL-SEARCH-REPORT | JP2008094698 |
| INTERNATIONAL-SEARCH-REPORT | JPH04214026 |
| INTERNATIONAL-SEARCH-REPORT | JPH05270824 |
| INTERNATIONAL-SEARCH-REPORT | WO03076336 |
| OPPOSITION | EP0444470 |
| OPPOSITION | EP1435338 |
| OPPOSITION | EP2160357 |
| OPPOSITION | US5137862 |
| OPPOSITION | US5976476 |
| OPPOSITION | US6255242 |
| OPPOSITION | WO2008156219 |
| SEARCH | EP0444470 |
| SEARCH | EP1484282 |
| SEARCH | US4940685 |
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
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Oct 29, 2025
Refund of fees
Search/Exam
Oct 27, 2025
Oct 27, 2025
Oct 24, 2025
Oct 24, 2025
Oct 24, 2025
Oct 21, 2025
(Electronic) Receipt
Appeal
Oct 21, 2025
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Oct 21, 2025
Withdrawal of an appeal
Appeal
Oct 2, 2025
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Sep 5, 2025
Sep 1, 2025
(Electronic) Receipt
Appeal
Sep 1, 2025
Sep 1, 2025
Jul 29, 2025
Jul 29, 2025
Jul 24, 2025
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Jun 2, 2025
(Electronic) Receipt
Appeal
Jun 2, 2025
Jun 2, 2025
Reply to appeal
Appeal
Jan 31, 2025
Jan 28, 2025
(Electronic) Receipt
Appeal
Jan 28, 2025
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Dec 2, 2024
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Nov 26, 2024
(Electronic) Receipt
Appeal
Nov 26, 2024
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Nov 15, 2024
(Electronic) Receipt
Appeal
Nov 15, 2024
Nov 15, 2024
Notice of appeal
Appeal
Oct 8, 2024
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Means of redress
OPPO
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Letter accompanying subsequently filed items
Search/Exam
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Aug 3, 2021
Jun 24, 2021
Decision to grant a European patent
Search/Exam
May 18, 2021
(Electronic) Receipt
Search/Exam
May 18, 2021
Filing of the translations of the claims
Search/Exam
May 18, 2021
French translation of claims
Search/Exam
May 18, 2021
German translation of the claims
Search/Exam
May 7, 2021
Apr 30, 2021
(Electronic) Receipt
Search/Exam
Apr 30, 2021
Annexes in respect of a client data request
Search/Exam
Apr 30, 2021
Letter accompanying subsequently filed items
Search/Exam
Apr 30, 2021
Apr 20, 2021
(Electronic) Receipt
Search/Exam
Apr 20, 2021
Annexes in respect of a client data request
Search/Exam
Apr 20, 2021
Annexes in respect of a client data request
Search/Exam
Apr 20, 2021
Letter accompanying subsequently filed items
Search/Exam
Apr 20, 2021
Feb 16, 2021
Feb 16, 2021
Feb 16, 2021
Intention to grant (signatures)
Search/Exam
Feb 16, 2021
Text intended for grant (clean copy)
Search/Exam
Feb 16, 2021
Dec 1, 2020
(Electronic) Receipt
Search/Exam
Dec 1, 2020
Amended claims with annotations
Search/Exam
Dec 1, 2020
Amended description with annotations
Search/Exam
Dec 1, 2020
Claims
Search/Exam
Dec 1, 2020
Description
Search/Exam
Dec 1, 2020
Letter accompanying subsequently filed items
Search/Exam
Dec 1, 2020
Sep 14, 2020
Sep 8, 2020
(Electronic) Receipt
Search/Exam
Sep 8, 2020
Letter accompanying subsequently filed items
Search/Exam
Sep 8, 2020
May 25, 2020
Annex to the communication
Search/Exam
May 25, 2020
Communication from the Examining Division
Search/Exam
Mar 19, 2015
Claims
Search/Exam
Mar 19, 2015
Feb 24, 2015
Submission concerning representation
Search/Exam
Jan 22, 2015
Jan 12, 2015
Sep 12, 2014
Annex to the communication
Search/Exam
Sep 12, 2014
Communication from the Examining Division
Search/Exam
Sep 2, 2014
Examination started
Search/Exam
Oct 25, 2013
Oct 25, 2013
Amendments received before examination
Search/Exam
Oct 25, 2013
Amendments received before examination
Search/Exam
Apr 16, 2013
Mar 28, 2013
Mar 28, 2013
European search opinion
Search/Exam
Mar 28, 2013
Supplementary European search report
Search/Exam
Feb 10, 2010
Feb 10, 2010
Jan 15, 2010
Dec 17, 2009
(Electronic) Receipt
Search/Exam
Dec 17, 2009
Request for entry into the European phase
Search/Exam
Oct 28, 2009
Information on entry into European phase
Search/Exam
Jan 14, 2009
Dec 24, 2008
Copy of the international search report
Search/Exam
Dec 24, 2008
Published international application - A1
Search/Exam