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The patent EP2735375 was granted to Basf on Jun 17, 2020. The application was filed on Dec 15, 2008 under application number EP14152154A. The patent is currently recorded with a legal status of "Revoked".

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 |
|---|---|---|---|
| COVESTRO DEUTSCHLAND | Mar 16, 2021 | LEVPAT | ADMISSIBLE |
| HUNTSMAN | Mar 10, 2021 | MEISSNER BOLTE PARTNERSCHAFT MBB | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | DE19741523 |
| DESCRIPTION | WO2006029786 |
| EXAMINATION | JPH08266939 |
| EXAMINATION | US4572435 |
| OPPOSITION | EP0553695 |
| OPPOSITION | EP0770466 |
| OPPOSITION | EP1066944 |
| OPPOSITION | GB1596464 |
| OPPOSITION | JP2006142125 |
| OPPOSITION | JP2006142126 |
| OPPOSITION | US2005222289 |
| OPPOSITION | US2098523 |
| OPPOSITION | US3431889 |
| OPPOSITION | US4165211 |
| OPPOSITION | US4201321 |
| OPPOSITION | US4572435 |
| OPPOSITION | US4809744 |
| OPPOSITION | US4945854 |
| OPPOSITION | US5264036 |
| OPPOSITION | WO2005118240 |
| OPPOSITION | WO2008104492 |
| SEARCH | DE4225618 |
| SEARCH | EP0770466 |
| SEARCH | JP2006142125 |
| SEARCH | US2005222289 |
| SEARCH | US2098523 |
| SEARCH | US3431889 |
| SEARCH | WO0069571 |
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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Feb 28, 2024
(Electronic) Receipt
Appeal
Feb 28, 2024
Advice of delivery
Appeal
Feb 28, 2024
Feb 26, 2024
Feb 26, 2024
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Feb 12, 2024
Refund of fees
Appeal
Feb 6, 2024
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Feb 5, 2024
(Electronic) Receipt
Appeal
Feb 5, 2024
Feb 5, 2024
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Withdrawal of an appeal
Appeal
Jan 12, 2024
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Jan 9, 2024
(Electronic) Receipt
Appeal
Jan 9, 2024
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Jan 4, 2024
(Electronic) Receipt
Appeal
Jan 4, 2024
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Appeal
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Appeal
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Appeal
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Appeal
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(Electronic) Receipt
Appeal
Jul 11, 2023
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Reply to appeal
Appeal
Jul 10, 2023
(Electronic) Receipt
Appeal
Jul 10, 2023
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Reply to appeal
Appeal
Jul 7, 2023
(Electronic) Receipt
Appeal
Jul 7, 2023
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Reply to appeal
Appeal
Mar 20, 2023
Letter accompanying subsequently filed items
Search/Exam
Mar 20, 2023
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Appeal
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Appeal
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(Electronic) Receipt
Appeal
Dec 23, 2022
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Notice of appeal
Appeal
Dec 16, 2022
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(Electronic) Receipt
Appeal
Dec 13, 2022
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Notice of appeal
Appeal
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Jun 29, 2020
May 25, 2020
Decision to grant a European patent
Search/Exam
May 5, 2020
(Electronic) Receipt
Search/Exam
May 5, 2020
English translation of the claims
Search/Exam
May 5, 2020
Filing of the translations of the claims
Search/Exam
May 5, 2020
French translation of claims
Search/Exam
Apr 14, 2020
Apr 14, 2020
Apr 14, 2020
Text intended for grant (clean copy)
Search/Exam
Apr 14, 2020
Apr 2, 2020
Apr 2, 2020
Intention to grant (signatures)
Search/Exam
Nov 20, 2019
Reply to a complaint
Search/Exam
Oct 10, 2019
Complaint
Search/Exam
Jun 3, 2019
(Electronic) Receipt
Search/Exam
Jun 3, 2019
Letter accompanying subsequently filed items
Search/Exam
Jun 3, 2019
May 23, 2019
Annex to a communication
Search/Exam
May 23, 2019
Annex to the communication
Search/Exam
May 23, 2019
Communication from the Examining Division
Search/Exam
Oct 16, 2018
(Electronic) Receipt
Search/Exam
Oct 16, 2018
Amended claims with annotations
Search/Exam
Oct 16, 2018
Amended description with annotations
Search/Exam
Oct 16, 2018
Claims
Search/Exam
Oct 16, 2018
Description
Search/Exam
Oct 16, 2018
Letter accompanying subsequently filed items
Search/Exam
Oct 16, 2018
Jun 14, 2018
Annex to the communication
Search/Exam
Jun 14, 2018
Communication from the Examining Division
Search/Exam
Jun 7, 2018
Examination started
Search/Exam
Feb 26, 2018
Feb 15, 2017
Feb 15, 2017
Submission concerning representation
Search/Exam
Mar 16, 2016
Mar 10, 2016
Mar 3, 2016
CDS Clean up - amended applicant details
Search/Exam
Mar 3, 2016
Nov 26, 2014
Nov 26, 2014
Amended claims with annotations
Search/Exam
Nov 26, 2014
Nov 26, 2014
Amended description with annotations
Search/Exam
Nov 26, 2014
Amendments received before examination
Search/Exam
Nov 21, 2014
Nov 21, 2014
Amended claims with annotations
Search/Exam
Nov 21, 2014
Nov 21, 2014
Amended description with annotations
Search/Exam
Nov 21, 2014
Amendments received before examination
Search/Exam
Jun 3, 2014
May 14, 2014
Refund of fees
Search/Exam
Apr 30, 2014
Notification of forthcoming publication
Search/Exam
Apr 28, 2014
Apr 28, 2014
European search opinion
Search/Exam
Apr 28, 2014
European search report
Search/Exam
Apr 22, 2014
Communication to designated inventor
Search/Exam
Apr 22, 2014
Communication to designated inventor
Search/Exam
Apr 22, 2014
Communication to designated inventor
Search/Exam
Apr 22, 2014
Communication to designated inventor
Search/Exam
Apr 22, 2014
Communication to designated inventor
Search/Exam
Apr 22, 2014
Communication to designated inventor
Search/Exam
Apr 22, 2014
Communication to designated inventor
Search/Exam
Apr 22, 2014
Modified abstract
Search/Exam
Jan 22, 2014
Abstract
Search/Exam
Jan 22, 2014
Jan 22, 2014
Claims
Search/Exam
Jan 22, 2014
Description
Search/Exam
Jan 22, 2014
Designation of inventor
Search/Exam
Jan 22, 2014
Designation of inventor
Search/Exam
Jan 22, 2014
Designation of inventor
Search/Exam
Jan 22, 2014
Designation of inventor
Search/Exam
Jan 22, 2014
Designation of inventor
Search/Exam
Jan 22, 2014
Designation of inventor
Search/Exam
Jan 22, 2014
Designation of inventor
Search/Exam
Jan 22, 2014
Drawings
Search/Exam
Jan 22, 2014
Request for grant of a European patent
Search/Exam
Jul 17, 2009