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The patent EP3951738 was granted to Pfeiffer Vacuum Technology on Dec 13, 2023. The application was originally filed on Dec 13, 2021 under application number EP21214055A. 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.
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| OPPOSITION | EP3620661 |
| OPPOSITION | US2002094277 |
| OPPOSITION | US2003014160 |
| OPPOSITION | US2008275853 |
| OPPOSITION | US2020063993 |
| OPPOSITION | US2020221912 |
| OPPOSITION | US7711790 |
| SEARCH | EP1903529 |
| SEARCH | EP1903530 |
| SEARCH | EP3620661 |
| SEARCH | US2020221912 |
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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Nov 12, 2025
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Means of redress
OPPO
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Authorisation
OPPO
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Nov 16, 2023
Decision to grant a European patent
Search/Exam
Nov 2, 2023
(Electronic) Receipt
Search/Exam
Nov 2, 2023
English translation of the claims
Search/Exam
Nov 2, 2023
Filing of the translations of the claims
Search/Exam
Nov 2, 2023
French translation of claims
Search/Exam
Nov 2, 2023
Letter accompanying subsequently filed items
Search/Exam
Sep 22, 2023
Sep 22, 2023
Sep 22, 2023
Sep 22, 2023
Intention to grant (signatures)
Search/Exam
Sep 22, 2023
Text intended for grant (clean copy)
Search/Exam
Sep 22, 2023
Jun 29, 2023
(Electronic) Receipt
Search/Exam
Jun 29, 2023
Amended claims with annotations
Search/Exam
Jun 29, 2023
Amended description with annotations
Search/Exam
Jun 29, 2023
Claims
Search/Exam
Jun 29, 2023
Description
Search/Exam
Jun 29, 2023
Letter accompanying subsequently filed items
Search/Exam
Jun 29, 2023
Mar 7, 2023
Annex to the communication
Search/Exam
Mar 7, 2023
Communication from the Examining Division
Search/Exam
Feb 23, 2023
Examination started
Search/Exam
Dec 29, 2022
(Electronic) Receipt
Search/Exam
Dec 29, 2022
Dec 29, 2022
Amended claims with annotations
Search/Exam
Dec 29, 2022
Dec 29, 2022
Amended description with annotations
Search/Exam
Dec 29, 2022
Amendments received before examination
Search/Exam
Dec 29, 2022
Letter accompanying subsequently filed items
Search/Exam
Jul 11, 2022
Jun 7, 2022
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European search opinion
Search/Exam
Jun 7, 2022
European search report
Search/Exam
Jun 7, 2022
Information on Search Strategy
Search/Exam
May 24, 2022
Search started
Search/Exam
Jan 12, 2022
Notification of forthcoming publication
Search/Exam
Jan 11, 2022
EPO/applicant correspondence crossed
Search/Exam
Jan 4, 2022
Deficiency in designation of inventor
Search/Exam
Dec 30, 2021
(Electronic) Receipt
Search/Exam
Dec 30, 2021
Designation of inventor
Search/Exam
Dec 30, 2021
Letter accompanying subsequently filed items
Search/Exam
Dec 14, 2021
Request for accelerated (early) publication
Search/Exam
Dec 13, 2021
Abstract
Search/Exam
Dec 13, 2021
Dec 13, 2021
Claims
Search/Exam
Dec 13, 2021
Description
Search/Exam
Dec 13, 2021
Drawings
Search/Exam
Dec 13, 2021
Request for grant of a European patent
Search/Exam