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The patent EP4077453 was granted to Basf on Sep 27, 2023. The application was filed on Dec 8, 2020 under application number EP20820146A. 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 |
|---|---|---|---|
| COVESTRO DEUTSCHLAND | Jun 27, 2024 | LEVPAT | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | WO2019EP66252 |
| DESCRIPTION | DE1111394 |
| DESCRIPTION | DE1152536 |
| DESCRIPTION | DE1152537 |
| DESCRIPTION | DE1222669 |
| DESCRIPTION | DE3612125 |
| DESCRIPTION | EP2148156 |
| DESCRIPTION | WO2011134856 |
| DESCRIPTION | WO2011134866 |
| INTERNATIONAL-SEARCH-REPORT | US2011221085 |
| INTERNATIONAL-SEARCH-REPORT | US2012009414 |
| INTERNATIONAL-SEARCH-REPORT | US2016376397 |
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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Dec 23, 2025
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Means of redress
OPPO
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Aug 31, 2023
Decision to grant a European patent
Search/Exam
Aug 15, 2023
(Electronic) Receipt
Search/Exam
Aug 15, 2023
French translation of claims
Search/Exam
Aug 15, 2023
German translation of the claims
Search/Exam
Aug 15, 2023
Letter accompanying subsequently filed items
Search/Exam
May 15, 2023
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Intention to grant (signatures)
Search/Exam
May 15, 2023
Text intended for grant (clean copy)
Search/Exam
May 15, 2023
Apr 19, 2023
Examination started
Search/Exam
Sep 28, 2022
Jul 27, 2022
Jul 20, 2022
Priority search results copy provided by EPO
Search/Exam
Jul 5, 2022
Jun 8, 2022
Information regarding early processing
Search/Exam
May 30, 2022
(Electronic) Receipt
Search/Exam
May 30, 2022
Request for entry into the European phase
Search/Exam
May 2, 2022
Information on entry into European phase
Search/Exam
Jul 12, 2021
Jun 24, 2021
Copy of the international search report
Search/Exam
Jun 24, 2021
Published international application - A1
Search/Exam
Mar 15, 2021
ISR: cited documents
PCTISA
Mar 15, 2021
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Dec 18, 2020
Dec 17, 2020
Dec 14, 2020
Dec 8, 2020
(Electronic) Receipt
PCTRO
Dec 8, 2020
Abstract
PCTRO
Dec 8, 2020
Claims
PCTRO
Dec 8, 2020
Description
PCTRO
Dec 8, 2020
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RO101 Declaration
PCTRO
Dec 8, 2020
RO101 Declaration
PCTRO