Patent No. EP3851711 (titled "Method For Monitoring Membrane Valves") was filed by Sisto Armaturen on Jan 18, 2021. The application was issued on Aug 30, 2023.

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 |
|---|---|---|
| GEMU GEBR MULLER APPARATEBAU KOMMANDITGESELLSCHAFT | May 23, 2024 | DREISS PATENTANWALTE PARTG MBB |
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
Get instant alerts for new documents
Jan 29, 2026
Jan 29, 2026
Jan 22, 2026
Jan 22, 2026
Jan 16, 2026
Jan 16, 2026
Jan 16, 2026
Jan 16, 2026
Jan 7, 2026
Jan 7, 2026
Jan 7, 2026
Jan 7, 2026
Dec 22, 2025
Dec 22, 2025
Nov 5, 2025
Nov 5, 2025
Nov 5, 2025
Nov 5, 2025
Nov 5, 2025
Nov 5, 2025
Nov 5, 2025
Nov 5, 2025
Nov 5, 2025
Nov 5, 2025
Nov 5, 2025
Nov 5, 2025
Nov 5, 2025
Oct 15, 2025
Oct 6, 2025
Oct 2, 2025
Oct 2, 2025
Oct 2, 2025
Oct 2, 2025
Oct 2, 2025
Oct 2, 2025
Oct 2, 2025
Oct 2, 2025
Oct 2, 2025
Oct 2, 2025
Oct 2, 2025
Oct 2, 2025
Oct 2, 2025
Aug 20, 2025
Aug 14, 2025
Aug 14, 2025
Aug 14, 2025
Aug 14, 2025
Aug 14, 2025
Aug 14, 2025
Aug 14, 2025
Aug 14, 2025
Aug 14, 2025
Aug 14, 2025
Aug 14, 2025
Aug 14, 2025
Aug 11, 2025
Aug 11, 2025
Aug 11, 2025
Aug 11, 2025
Aug 11, 2025
Aug 11, 2025
Aug 11, 2025
Aug 11, 2025
Aug 11, 2025
Aug 11, 2025
Aug 11, 2025
Aug 11, 2025
Aug 11, 2025
Aug 11, 2025
Aug 11, 2025
Aug 11, 2025
Aug 11, 2025
Feb 6, 2025
Feb 3, 2025
Feb 3, 2025
Feb 3, 2025
Feb 3, 2025
Feb 3, 2025
Jan 30, 2025
Jan 30, 2025
Jan 30, 2025
Jan 29, 2025
Oct 29, 2024
Oct 23, 2024
Oct 23, 2024
Oct 23, 2024
Jul 3, 2024
Jul 3, 2024
Jun 26, 2024
Jun 26, 2024
Jun 26, 2024
Jun 26, 2024
Jun 26, 2024
May 31, 2024
May 31, 2024
May 23, 2024
May 23, 2024
May 23, 2024
May 23, 2024
May 23, 2024
May 23, 2024
May 23, 2024
May 23, 2024
May 23, 2024
May 23, 2024
May 23, 2024
May 23, 2024
May 23, 2024
May 23, 2024
May 23, 2024
May 23, 2024
May 23, 2024
May 23, 2024
May 23, 2024
May 23, 2024
May 23, 2024
May 23, 2024
May 23, 2024
May 23, 2024
May 23, 2024
May 23, 2024
May 23, 2024
May 23, 2024
Sep 12, 2023
Aug 3, 2023
Jul 25, 2023
Jul 25, 2023
Jul 25, 2023
Jul 25, 2023
Mar 30, 2023
Mar 30, 2023
Mar 30, 2023
Mar 30, 2023
Mar 30, 2023
Mar 30, 2023
Mar 9, 2023
Dec 16, 2021
Dec 16, 2021
Dec 7, 2021
Nov 25, 2021
Nov 25, 2021
Nov 25, 2021
Oct 25, 2021
Oct 25, 2021
Oct 25, 2021
Oct 25, 2021
Oct 25, 2021
Oct 25, 2021
Oct 25, 2021
Jul 26, 2021
Jun 23, 2021
Jun 14, 2021
Jun 14, 2021
Jun 14, 2021
Jun 14, 2021
Mar 12, 2021
Mar 12, 2021
Mar 12, 2021
Mar 12, 2021
Mar 12, 2021
Jan 28, 2021
Jan 28, 2021
Jan 18, 2021
Jan 18, 2021
Jan 18, 2021
Jan 18, 2021
Jan 18, 2021
Jan 18, 2021
Jan 18, 2021