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The patent EP3540884 was granted to Kaiser on Oct 15, 2025. The application was filed on Mar 5, 2019 under application number EP19160771A. 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 |
|---|---|---|---|
| F TRONIC | Aug 9, 2022 | KEIL & SCHAAFHAUSEN PATENTANWALTE PARTGMBB | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | EP2360800 |
| DESCRIPTION | US2005072590 |
| DESCRIPTION | WO9614682 |
| EXAMINATION | DE202015102105U |
| EXAMINATION | EP3125384 |
| OPPOSITION | DE102005032896 |
| OPPOSITION | DE19815950 |
| OPPOSITION | DE202015102105U |
| OPPOSITION | EP1722453 |
| OPPOSITION | EP2360800 |
| OPPOSITION | EP3125384 |
| OPPOSITION | US2005092506 |
| OPPOSITION | US5043536 |
| OPPOSITION | WO9614682 |
| SEARCH | DE102005032896 |
| SEARCH | US2005092506 |
| SEARCH | US5043536 |
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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Sep 18, 2025
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Refund of fees
Search/Exam
Jun 27, 2025
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Jun 17, 2025
(Electronic) Receipt
Appeal
Jun 17, 2025
Jun 17, 2025
Withdrawal of an appeal
Appeal
May 13, 2025
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(Electronic) Receipt
Appeal
May 6, 2025
Notice of appeal
Appeal
May 6, 2025
Notice of appeal
Appeal
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Dec 7, 2021
Oct 28, 2021
Decision to grant a European patent
Search/Exam
Oct 15, 2021
English translation of the claims
Search/Exam
Oct 15, 2021
Filing of the translations of the claims
Search/Exam
Oct 15, 2021
French translation of claims
Search/Exam
Oct 15, 2021
Letter concerning fees and payments
Search/Exam
Jun 17, 2021
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Intention to grant (signatures)
Search/Exam
Jun 17, 2021
Text intended for grant (clean copy)
Search/Exam
Jun 17, 2021
Feb 11, 2021
Amended claims with annotations
Search/Exam
Feb 11, 2021
Claims
Search/Exam
Feb 11, 2021
Nov 4, 2020
Annex to the communication
Search/Exam
Nov 4, 2020
Communication from the Examining Division
Search/Exam
Sep 25, 2020
Amended claims with annotations
Search/Exam
Sep 25, 2020
Claims
Search/Exam
Sep 25, 2020
May 25, 2020
Annex to the communication
Search/Exam
May 25, 2020
Communication from the Examining Division
Search/Exam
May 15, 2020
Matter concerning the application
Search/Exam
Apr 30, 2020
Examination started
Search/Exam
Apr 2, 2020
Mar 26, 2020
Mar 16, 2020
Mar 16, 2020
Amended claims with annotations
Search/Exam
Mar 16, 2020
Amendments received before examination
Search/Exam
Mar 16, 2020
Letter concerning fees and payments
Search/Exam
Sep 23, 2019
Aug 21, 2019
Notification of forthcoming publication
Search/Exam
May 28, 2019
May 28, 2019
European search opinion
Search/Exam
May 28, 2019
European search report
Search/Exam
May 28, 2019
Information on Search Strategy
Search/Exam
May 17, 2019
Search started
Search/Exam
Apr 29, 2019
Letter concerning the priority
Search/Exam
Apr 29, 2019
Priority document
Search/Exam
Apr 26, 2019
Communication to designated inventor
Search/Exam
Apr 26, 2019
Communication to designated inventor
Search/Exam
Mar 5, 2019
Abstract
Search/Exam
Mar 5, 2019
Mar 5, 2019
Claims
Search/Exam
Mar 5, 2019
Description
Search/Exam
Mar 5, 2019
Designation of inventor
Search/Exam
Mar 5, 2019
Drawings
Search/Exam
Mar 5, 2019
Request for grant of a European patent
Search/Exam