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The patent EP3399191 was granted to Kaeser Kompressoren on May 27, 2020. The application was filed on May 3, 2017 under application number EP17169341A. 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 | Mar 1, 2021 | VO | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | EP2784324 |
| DESCRIPTION | WO2014018530 |
| OPPOSITION | CN101096079 |
| OPPOSITION | CN103216447 |
| OPPOSITION | CN105710789 |
| OPPOSITION | EP0255870 |
| OPPOSITION | ES1052890U |
| OPPOSITION | GB1440550 |
| OPPOSITION | KR19980061640 |
| OPPOSITION | US2003126733 |
| OPPOSITION | US2008248269 |
| OPPOSITION | US2012100029 |
| OPPOSITION | US2014023540 |
| OPPOSITION | US2015003996 |
| OPPOSITION | US2015300340 |
| OPPOSITION | US2016169009 |
| OPPOSITION | US3502453 |
| OPPOSITION | US4077922 |
| OPPOSITION | US4466785 |
| OPPOSITION | US5364250 |
| OPPOSITION | US5554020 |
| OPPOSITION | WO2008088600 |
| OPPOSITION | WO2016013558 |
| SEARCH | EP0109823 |
| SEARCH | EP0705979 |
| SEARCH | JP2000034991 |
| SEARCH | US2003126733 |
| SEARCH | WO2008088600 |
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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Oct 27, 2025
Oct 27, 2025
Oct 21, 2025
(Electronic) Receipt
Appeal
Oct 21, 2025
(Electronic) Receipt
Appeal
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(Electronic) Receipt
Appeal
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Notice of appeal
Appeal
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(Electronic) Receipt
Appeal
Aug 14, 2025
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Notice of appeal
Appeal
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OPPO
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Refund of fees
Appeal
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Reply to appeal
Appeal
Mar 24, 2023
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Letter accompanying subsequently filed items
Search/Exam
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(Electronic) Receipt
Appeal
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(Electronic) Receipt
Appeal
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Notice of appeal
Appeal
Aug 8, 2022
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OPPO
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Jun 8, 2020
May 4, 2020
Decision to grant a European patent
Search/Exam
Apr 20, 2020
(Electronic) Receipt
Search/Exam
Apr 20, 2020
English translation of the claims
Search/Exam
Apr 20, 2020
Filing of the translations of the claims
Search/Exam
Apr 20, 2020
French translation of claims
Search/Exam
Apr 20, 2020
Letter accompanying subsequently filed items
Search/Exam
Dec 12, 2019
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Intention to grant (signatures)
Search/Exam
Dec 12, 2019
Text intended for grant (clean copy)
Search/Exam
Dec 12, 2019
Nov 13, 2019
Examination started
Search/Exam
May 2, 2019
(Electronic) Receipt
Search/Exam
May 2, 2019
Letter accompanying subsequently filed items
Search/Exam
May 2, 2019
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Oct 10, 2018
Notification of forthcoming publication
Search/Exam
Nov 16, 2017
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European search opinion
Search/Exam
Nov 16, 2017
European search report
Search/Exam
Nov 16, 2017
Information on Search Strategy
Search/Exam
Nov 10, 2017
Modified abstract
Search/Exam
Nov 3, 2017
Search started
Search/Exam
Jun 26, 2017
Communication to designated inventor
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Jun 26, 2017
Communication to designated inventor
Search/Exam
May 3, 2017
Abstract
Search/Exam
May 3, 2017
May 3, 2017
Claims
Search/Exam
May 3, 2017
Description
Search/Exam
May 3, 2017
Designation of inventor
Search/Exam
May 3, 2017
Drawings
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May 3, 2017
Request for grant of a European patent
Search/Exam