Patent No. EP3581631 (titled "Compositions Comprising 2,3,3,3-Tetrafluoropropene") was filed by The Chemours FC on Dec 22, 2010. The application was issued on Nov 6, 2024.

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 |
|---|---|---|
| ARKEMA FRANCE | Aug 3, 2025 | ARKEMA PATENT |
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 9, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Jan 2, 2026
Oct 23, 2025
Oct 23, 2025
Oct 21, 2025
Oct 17, 2025
Oct 17, 2025
Oct 17, 2025
Oct 6, 2025
Oct 2, 2025
Oct 2, 2025
Oct 2, 2025
Sep 2, 2025
Sep 2, 2025
Sep 2, 2025
Aug 28, 2025
Aug 28, 2025
Aug 28, 2025
Aug 7, 2025
Aug 7, 2025
Aug 3, 2025
Aug 3, 2025
Aug 3, 2025
Aug 3, 2025
Aug 3, 2025
Aug 3, 2025
Aug 3, 2025
Aug 3, 2025
Aug 3, 2025
Aug 3, 2025
Aug 3, 2025
Aug 3, 2025
Aug 3, 2025
Aug 3, 2025
Aug 3, 2025
Aug 3, 2025
Aug 3, 2025
Aug 3, 2025
Aug 3, 2025
Aug 3, 2025
Aug 3, 2025
Aug 3, 2025
Aug 3, 2025
Nov 29, 2024
Nov 19, 2024
Oct 10, 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 12, 2024
Sep 12, 2024
Sep 12, 2024
Sep 12, 2024
Sep 12, 2024
Sep 12, 2024
Aug 30, 2024
Aug 30, 2024
Aug 30, 2024
Aug 30, 2024
Aug 30, 2024
May 27, 2024
May 27, 2024
May 27, 2024
May 27, 2024
May 27, 2024
May 27, 2024
Jan 10, 2024
Dec 12, 2023
Dec 12, 2023
Dec 12, 2023
Dec 12, 2023
Dec 12, 2023
Oct 31, 2023
Oct 31, 2023
Oct 30, 2023
Oct 24, 2023
Oct 24, 2023
Oct 23, 2023
Oct 23, 2023
Aug 30, 2022
Aug 30, 2022
Aug 30, 2022
Aug 30, 2022
Aug 30, 2022
Aug 30, 2022
May 4, 2022
May 4, 2022
Apr 29, 2022
Jun 4, 2020
Jun 4, 2020
Jun 4, 2020
Jun 4, 2020
Jun 4, 2020
Jan 2, 2020
Nov 20, 2019
Nov 15, 2019
Nov 14, 2019
Nov 14, 2019
Nov 14, 2019
Nov 14, 2019
Nov 6, 2019
Sep 27, 2019
Aug 5, 2019
Aug 5, 2019
Aug 5, 2019
Aug 5, 2019
Aug 5, 2019
Aug 5, 2019
Aug 5, 2019
Aug 5, 2019
Aug 5, 2019
Aug 5, 2019
Aug 5, 2019
Aug 9, 2011