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The patent EP3597920 was granted to Kaeser Kompressoren on Sep 6, 2023. The application was filed on Apr 27, 2015 under application number EP19190907A. 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 |
|---|---|---|---|
| ATLAS COPCO | Jun 5, 2024 | VO | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| EXAMINATION | DE19539002 |
| EXAMINATION | DE2911415 |
| OPPOSITION | EP0166531 |
| OTHER | US4350480 |
| SEARCH | DE1428265 |
| SEARCH | DE19539002 |
| SEARCH | DE2911415 |
| SEARCH | DE3230720 |
| SEARCH | EP0398675 |
| SEARCH | GB2501302 |
| SEARCH | JP2007146659 |
| SEARCH | JP2009243325 |
| SEARCH | JPS60216089 |
| SEARCH | US2622787 |
| SEARCH | WO9721926 |
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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Means of redress
OPPO
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Sep 19, 2023
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Decision to grant a European patent
Search/Exam
Jul 31, 2023
(Electronic) Receipt
Search/Exam
Jul 31, 2023
Filing of the translations of the claims
Search/Exam
Jul 31, 2023
Letter accompanying subsequently filed items
Search/Exam
Mar 24, 2023
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Intention to grant (signatures)
Search/Exam
Mar 23, 2023
Text intended for grant (clean copy)
Search/Exam
Mar 23, 2023
Mar 20, 2023
Letter accompanying subsequently filed items
Search/Exam
Mar 20, 2023
Feb 14, 2023
(Electronic) Receipt
Search/Exam
Feb 14, 2023
Claims
Search/Exam
Feb 14, 2023
English translation of the claims
Search/Exam
Feb 14, 2023
French translation of claims
Search/Exam
Feb 14, 2023
Letter accompanying subsequently filed items
Search/Exam
Feb 14, 2023
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Oct 7, 2022
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Intention to grant (signatures)
Search/Exam
Oct 7, 2022
Text intended for grant (clean copy)
Search/Exam
Oct 7, 2022
Apr 21, 2022
(Electronic) Receipt
Search/Exam
Apr 21, 2022
Letter accompanying subsequently filed items
Search/Exam
Apr 21, 2022
Dec 17, 2021
Annex to the communication
Search/Exam
Dec 17, 2021
Communication from the Examining Division
Search/Exam
Dec 13, 2021
Examination started
Search/Exam
Oct 6, 2021
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Non-scannable object
Search/Exam
Oct 6, 2021
Non-scannable object
Search/Exam
Oct 6, 2021
Observations by third parties
Search/Exam
Sep 29, 2021
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Citation filed by a third party
Search/Exam
Sep 23, 2021
Non-patent literature filed by a third party
Search/Exam
Sep 23, 2021
Non-patent literature filed by a third party
Search/Exam
Sep 23, 2021
Non-patent literature filed by a third party
Search/Exam
Sep 23, 2021
Non-patent literature filed by a third party
Search/Exam
Sep 23, 2021
Observations by third parties
Search/Exam
Aug 24, 2021
(Electronic) Receipt
Search/Exam
Aug 24, 2021
Letter accompanying subsequently filed items
Search/Exam
Aug 24, 2021
Reply to Written Opinion prepared by the EPO
Search/Exam
Mar 29, 2021
Feb 26, 2021
Refund of fees
Search/Exam
Feb 22, 2021
Feb 22, 2021
European search opinion
Search/Exam
Feb 22, 2021
European search report
Search/Exam
Feb 22, 2021
Information on Search Strategy
Search/Exam
Jan 7, 2020
Notification of forthcoming publication
Search/Exam
Oct 2, 2019
Communication to designated inventor
Search/Exam
Sep 18, 2019
(Electronic) Receipt
Search/Exam
Sep 18, 2019
Sep 18, 2019
Letter accompanying subsequently filed items
Search/Exam
Sep 18, 2019
Aug 26, 2019
Aug 9, 2019
Abstract
Search/Exam
Aug 9, 2019
Aug 9, 2019
Annex
Search/Exam
Aug 9, 2019
Claims
Search/Exam
Aug 9, 2019
Description
Search/Exam
Aug 9, 2019
Designation of inventor
Search/Exam
Aug 9, 2019
Drawings
Search/Exam
Aug 9, 2019
Request for grant of a European patent
Search/Exam
Nov 16, 2015