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The patent EP3784702 was granted to Wacker Chemie on Oct 2, 2024. The application was filed on May 10, 2019 under application number EP19723779A. The patent is currently recorded with a legal status of "Patent Maintained As Amended".

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 |
|---|---|---|---|
| CELANESE | Oct 5, 2022 | SIMMONS & SIMMONS MUNICH | WITHDRAWN |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | EP0057433 |
| DESCRIPTION | EP0152115 |
| DESCRIPTION | EP0248681 |
| DESCRIPTION | EP0633061 |
| DESCRIPTION | EP1230019 |
| DESCRIPTION | EP2658644 |
| DESCRIPTION | EP2689838 |
| DESCRIPTION | EP3256497 |
| DESCRIPTION | EP3351612 |
| DESCRIPTION | US2006130870 |
| DESCRIPTION | US4038473 |
| DESCRIPTION | US4904309 |
| DESCRIPTION | US6274690 |
| DESCRIPTION | WO9829186 |
| INTERNATIONAL-SEARCH-REPORT | DE19856590 |
| INTERNATIONAL-SEARCH-REPORT | US5064917 |
| OPPOSITION | DE10126560 |
| OPPOSITION | EP0057433 |
| OPPOSITION | EP0248681 |
| OPPOSITION | EP0924229 |
| OPPOSITION | EP1579050 |
| OPPOSITION | US5633334 |
| OPPOSITION | US6722377 |
| OPPOSITION | US8193104 |
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.
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Description
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OPPO
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Decision to grant a European patent
Search/Exam
Nov 29, 2021
Nov 25, 2021
(Electronic) Receipt
Search/Exam
Nov 25, 2021
English translation of the claims
Search/Exam
Nov 25, 2021
Filing of the translations of the claims
Search/Exam
Nov 25, 2021
French translation of claims
Search/Exam
Nov 25, 2021
Letter accompanying subsequently filed items
Search/Exam
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Intention to grant (signatures)
Search/Exam
Jul 30, 2021
Text intended for grant (clean copy)
Search/Exam
Jul 30, 2021
Jun 18, 2021
Examination started
Search/Exam
Feb 3, 2021
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Communication to designated inventor
Search/Exam
Dec 2, 2020
Communication to designated inventor
Search/Exam
Nov 25, 2020
(Electronic) Receipt
Search/Exam
Nov 25, 2020
General authorisation
Search/Exam
Nov 25, 2020
Matter concerning the application
Search/Exam
Nov 25, 2020
Request for entry into the European phase
Search/Exam
Nov 19, 2020
Copy of the international search report
Search/Exam
Nov 19, 2020
Copy of the international search report
Search/Exam
Nov 19, 2020
Published international application - A1
Search/Exam
May 24, 2019
May 10, 2019
(Electronic) Receipt
PCTRO
May 10, 2019
Abstract
PCTRO
May 10, 2019
Claims
PCTRO
May 10, 2019
Description
PCTRO
May 10, 2019
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