Patent No. EP3911578 (titled "Valve Carrier Ring For Self-Closing Dispensing Valve") was filed by Weener Plastics Group on Jan 13, 2020. The application was issued on Aug 9, 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 |
|---|---|---|
| APTARGROUP | May 8, 2024 | APPELT |
| LINN | May 8, 2024 | - |
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 12, 2026
Jan 12, 2026
Jan 12, 2026
Jan 12, 2026
Jan 12, 2026
Jan 12, 2026
Jan 5, 2026
Jan 5, 2026
Jan 5, 2026
Dec 31, 2025
Dec 31, 2025
Dec 31, 2025
Nov 4, 2025
Nov 4, 2025
Nov 4, 2025
Nov 4, 2025
Nov 4, 2025
Nov 4, 2025
Nov 4, 2025
Nov 4, 2025
Nov 4, 2025
Nov 4, 2025
Nov 4, 2025
Nov 4, 2025
Nov 4, 2025
Nov 4, 2025
Nov 4, 2025
Nov 4, 2025
Nov 4, 2025
Nov 4, 2025
Nov 4, 2025
Oct 14, 2025
Aug 28, 2025
Aug 28, 2025
Aug 25, 2025
Aug 25, 2025
Aug 25, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 19, 2025
Aug 19, 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 13, 2025
Aug 13, 2025
Aug 13, 2025
Aug 13, 2025
Aug 13, 2025
Aug 13, 2025
Aug 13, 2025
Aug 13, 2025
Aug 13, 2025
Aug 13, 2025
Feb 21, 2025
Feb 21, 2025
Feb 21, 2025
Feb 21, 2025
Feb 21, 2025
Feb 21, 2025
Sep 30, 2024
Sep 30, 2024
Sep 25, 2024
Sep 25, 2024
Sep 25, 2024
Sep 25, 2024
Sep 25, 2024
Sep 25, 2024
Sep 25, 2024
Sep 25, 2024
Sep 25, 2024
Sep 25, 2024
Sep 25, 2024
May 27, 2024
May 27, 2024
May 27, 2024
May 16, 2024
May 14, 2024
May 8, 2024
May 8, 2024
May 8, 2024
May 8, 2024
May 8, 2024
May 8, 2024
May 8, 2024
May 8, 2024
May 8, 2024
May 8, 2024
May 8, 2024
May 8, 2024
May 8, 2024
May 8, 2024
May 8, 2024
May 8, 2024
May 8, 2024
May 8, 2024
May 8, 2024
May 8, 2024
May 8, 2024
May 8, 2024
May 8, 2024
May 8, 2024
May 8, 2024
May 8, 2024
Aug 22, 2023
Jul 13, 2023
Jul 4, 2023
Jul 4, 2023
Jul 4, 2023
Jul 4, 2023
Jul 4, 2023
Mar 20, 2023
Mar 20, 2023
Mar 20, 2023
Mar 20, 2023
Mar 20, 2023
Mar 20, 2023
Jan 19, 2023
Jan 19, 2023
Jan 19, 2023
Jan 19, 2023
Sep 15, 2022
Sep 15, 2022
Sep 15, 2022
Sep 15, 2022
Sep 15, 2022
Aug 12, 2022
Feb 23, 2022
Feb 23, 2022
Feb 23, 2022
Feb 23, 2022
Feb 23, 2022
Oct 27, 2021
Aug 24, 2021
Aug 17, 2021
Aug 3, 2021
Aug 3, 2021
Aug 2, 2021
May 28, 2021
Aug 11, 2020
Jul 23, 2020
Jul 23, 2020