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The patent EP3550805 was granted to Diehl Metering Systems on Nov 29, 2023. The application was filed on Apr 2, 2019 under application number EP19166769A. 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 |
|---|---|---|---|
| TECHEM ENERGY SERVICES | Aug 28, 2024 | 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 |
|---|---|
| OPPOSITION | DE10152554 |
| OPPOSITION | DE102012203518 |
| OPPOSITION | US2012084554 |
| SEARCH | DE10152554 |
| SEARCH | DE102012203518 |
| SEARCH | US2012084554 |
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 8, 2025
Dec 3, 2025
(Electronic) Receipt
Appeal
Dec 3, 2025
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Oct 17, 2025
(Electronic) Receipt
Appeal
Oct 17, 2025
Notice of appeal
Appeal
Sep 30, 2025
Sep 30, 2025
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Means of redress
OPPO
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Dec 12, 2023
Nov 3, 2023
Decision to grant a European patent
Search/Exam
Oct 23, 2023
(Electronic) Receipt
Search/Exam
Oct 23, 2023
English translation of the claims
Search/Exam
Oct 23, 2023
Filing of the translations of the claims
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Oct 23, 2023
French translation of claims
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Jul 12, 2023
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Intention to grant (signatures)
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Jul 12, 2023
Text intended for grant (clean copy)
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Jul 12, 2023
Jun 26, 2023
Jun 23, 2023
(Electronic) Receipt
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Jun 23, 2023
Amended claims with annotations
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Jun 23, 2023
Amended description with annotations
Search/Exam
Jun 23, 2023
Claims
Search/Exam
Jun 23, 2023
Description
Search/Exam
Jun 23, 2023
Letter accompanying subsequently filed items
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Jun 23, 2023
Jun 20, 2023
Annex to the communication
Search/Exam
Jun 20, 2023
Consultation by telephone/in person
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Jun 20, 2023
Jun 1, 2023
(Electronic) Receipt
Search/Exam
Jun 1, 2023
Authorisation
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Jun 1, 2023
Letter accompanying subsequently filed items
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Jun 1, 2023
Oral proceedings: reply to date proposed
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Apr 24, 2023
(Electronic) Receipt
Search/Exam
Apr 24, 2023
Amended claims with annotations
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Apr 24, 2023
Amended description with annotations
Search/Exam
Apr 24, 2023
Claims
Search/Exam
Apr 24, 2023
Description
Search/Exam
Apr 24, 2023
Letter accompanying subsequently filed items
Search/Exam
Apr 24, 2023
Apr 24, 2023
Dec 19, 2022
Annex to the communication
Search/Exam
Dec 19, 2022
Summons to attend oral proceedings
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Apr 26, 2022
Jan 11, 2022
(Electronic) Receipt
Search/Exam
Jan 11, 2022
Amended claims with annotations
Search/Exam
Jan 11, 2022
Amended description with annotations
Search/Exam
Jan 11, 2022
Claims
Search/Exam
Jan 11, 2022
Description
Search/Exam
Jan 11, 2022
Letter accompanying subsequently filed items
Search/Exam
Jan 11, 2022
Sep 22, 2021
Annex to the communication
Search/Exam
Sep 22, 2021
Communication from the Examining Division
Search/Exam
Sep 1, 2020
(Electronic) Receipt
Search/Exam
Sep 1, 2020
Amended claims with annotations
Search/Exam
Sep 1, 2020
Amended description with annotations
Search/Exam
Sep 1, 2020
Claims
Search/Exam
Sep 1, 2020
Description
Search/Exam
Sep 1, 2020
Letter accompanying subsequently filed items
Search/Exam
Sep 1, 2020
Jun 5, 2020
Annex to the communication
Search/Exam
Jun 5, 2020
Communication from the Examining Division
Search/Exam
May 29, 2020
Examination started
Search/Exam
Feb 11, 2020
(Electronic) Receipt
Search/Exam
Feb 11, 2020
Feb 11, 2020
Amended claims with annotations
Search/Exam
Feb 11, 2020
Feb 11, 2020
Amended description with annotations
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Feb 11, 2020
Amendments received before examination
Search/Exam
Feb 11, 2020
Letter accompanying subsequently filed items
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Oct 14, 2019
Sep 11, 2019
Notification of forthcoming publication
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Aug 5, 2019
Aug 5, 2019
European search opinion
Search/Exam
Aug 5, 2019
European search report
Search/Exam
Aug 5, 2019
Information on Search Strategy
Search/Exam
Jul 29, 2019
Search started
Search/Exam
May 24, 2019
Communication to designated inventor
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May 24, 2019
Communication to designated inventor
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May 24, 2019
Communication to designated inventor
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May 24, 2019
Communication to designated inventor
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Apr 3, 2019
Letter concerning the priority
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Apr 3, 2019
Priority document
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Apr 2, 2019
Abstract
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Apr 2, 2019
Apr 2, 2019
Claims
Search/Exam
Apr 2, 2019
Description
Search/Exam
Apr 2, 2019
Designation of inventor
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Apr 2, 2019
Drawings
Search/Exam
Apr 2, 2019
Priority search results
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Apr 2, 2019
Request for grant of a European patent
Search/Exam