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The patent EP3455349 was granted to Sartorius Stedim Biotech on Jun 24, 2020. The application was filed on Aug 3, 2017 under application number EP17754071A. 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 |
|---|---|---|---|
| MAX PLANCK GESELLSCHAFT ZUR FORDERUNG DER WISSENSCHAFTEN EV | Mar 24, 2021 | KUTTENKEULER | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | WO2012169970 |
| DESCRIPTION | WO9532793 |
| INTERNATIONAL-SEARCH-REPORT | WO2009127285 |
| INTERNATIONAL-SEARCH-REPORT | WO2012169970 |
| INTERNATIONAL-SEARCH-REPORT | WO2015055269 |
| INTERNATIONAL-SEARCH-REPORT | WO2017076553 |
| OPPOSITION | DE102013017014 |
| OPPOSITION | EP0185813 |
| OPPOSITION | WO2009127285 |
| OPPOSITION | WO2012169970 |
| OPPOSITION | WO2015055269 |
| OPPOSITION | WO2017076553 |
| OPPOSITION | WO9532793 |
| OTHER | WO2017076553 |
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 18, 2025
Dec 17, 2025
(Electronic) Receipt
Appeal
Dec 17, 2025
Dec 17, 2025
Nov 10, 2025
Nov 7, 2025
(Electronic) Receipt
Appeal
Nov 7, 2025
Nov 7, 2025
Sep 17, 2025
Sep 17, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 13, 2025
(Electronic) Receipt
Appeal
Aug 13, 2025
Aug 13, 2025
Jul 30, 2025
Jul 24, 2025
(Electronic) Receipt
Appeal
Jul 24, 2025
Jul 24, 2025
Jul 16, 2025
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Jul 15, 2025
Jul 2, 2025
Apr 16, 2024
Apr 10, 2024
(Electronic) Receipt
Appeal
Apr 10, 2024
Apr 10, 2024
Apr 10, 2024
Apr 10, 2024
Apr 10, 2024
Apr 10, 2024
Apr 10, 2024
Apr 10, 2024
Apr 10, 2024
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Apr 10, 2024
Apr 10, 2024
Apr 10, 2024
Reply to appeal
Appeal
Mar 15, 2024
Mar 8, 2024
(Electronic) Receipt
Appeal
Mar 8, 2024
Mar 8, 2024
Mar 8, 2024
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Jan 16, 2024
Jan 16, 2024
Jan 8, 2024
(Electronic) Receipt
Appeal
Jan 8, 2024
Jan 8, 2024
Notice of appeal
Appeal
Nov 13, 2023
Nov 13, 2023
Nov 13, 2023
Nov 10, 2023
Nov 10, 2023
Nov 10, 2023
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Means of redress
OPPO
Nov 10, 2023
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Jul 6, 2020
May 28, 2020
Decision to grant a European patent
Search/Exam
May 20, 2020
Apr 21, 2020
Apr 21, 2020
Apr 14, 2020
(Electronic) Receipt
Search/Exam
Apr 14, 2020
Citation filed by a third party
Search/Exam
Apr 14, 2020
Citation filed by a third party
Search/Exam
Apr 14, 2020
Letter accompanying subsequently filed items
Search/Exam
Apr 14, 2020
Observations by third parties
Search/Exam
Apr 8, 2020
(Electronic) Receipt
Search/Exam
Apr 8, 2020
English translation of the claims
Search/Exam
Apr 8, 2020
Filing of the translations of the claims
Search/Exam
Apr 8, 2020
French translation of claims
Search/Exam
Apr 8, 2020
Letter accompanying subsequently filed items
Search/Exam
Jan 17, 2020
Jan 17, 2020
Jan 17, 2020
Intention to grant (signatures)
Search/Exam
Jan 17, 2020
Text intended for grant (clean copy)
Search/Exam
Jan 17, 2020
Oct 25, 2019
Examination started
Search/Exam
May 22, 2019
May 22, 2019
Amended claims with annotations
Search/Exam
May 22, 2019
Amendments received before examination
Search/Exam
Mar 21, 2019
Mar 20, 2019
Feb 20, 2019
Jan 8, 2019
Jan 4, 2019
Communication to designated inventor
Search/Exam
Jan 4, 2019
Communication to designated inventor
Search/Exam
Jan 4, 2019
Communication to designated inventor
Search/Exam
Jan 3, 2019
Dec 14, 2018
Matter concerning the application
Search/Exam
Dec 5, 2018
Information regarding early processing
Search/Exam
Oct 31, 2018
(Electronic) Receipt
Search/Exam
Oct 31, 2018
Request for entry into the European phase
Search/Exam
Mar 27, 2018
Mar 8, 2018
Copy of the international search report
Search/Exam
Mar 8, 2018
Copy of the international search report
Search/Exam
Mar 8, 2018
Published international application - A1
Search/Exam
Nov 7, 2017
ISR: cited documents
PCTISA
Nov 7, 2017
Nov 3, 2017
Nov 3, 2017
Nov 3, 2017
Aug 31, 2017
Aug 29, 2017
Aug 25, 2017
Aug 17, 2017
Aug 3, 2017
Abstract
PCTRO
Aug 3, 2017
Claims
PCTRO
Aug 3, 2017
Description
PCTRO
Aug 3, 2017
Drawings
PCTRO
Aug 3, 2017