Patent No. EP3988713 (titled "Method Of Treating A Fiber Web And A Treatment System For Treatment Of A Fiber Web") was filed by Valmet on Sep 14, 2021. The application was issued on Nov 1, 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 |
|---|---|---|
| ANDRITZ KUSTERS | Jul 25, 2024 | SPARING ROHL HENSELER |
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 27, 2026
Jan 27, 2026
Jan 21, 2026
Jan 21, 2026
Jan 21, 2026
Dec 15, 2025
Dec 15, 2025
Dec 15, 2025
Dec 15, 2025
Dec 15, 2025
Dec 15, 2025
Dec 15, 2025
Dec 15, 2025
Dec 15, 2025
Dec 15, 2025
Dec 15, 2025
Dec 15, 2025
Dec 15, 2025
Nov 27, 2025
Nov 5, 2025
Nov 5, 2025
Oct 22, 2025
Oct 22, 2025
Oct 22, 2025
Oct 1, 2025
Sep 30, 2025
Sep 29, 2025
Sep 26, 2025
Sep 26, 2025
Sep 26, 2025
Sep 26, 2025
Sep 26, 2025
Sep 25, 2025
Sep 25, 2025
Sep 25, 2025
Sep 24, 2025
Sep 24, 2025
Sep 24, 2025
Jul 25, 2025
Jul 22, 2025
Jul 22, 2025
Jul 22, 2025
Apr 7, 2025
Apr 7, 2025
Apr 7, 2025
Apr 7, 2025
Apr 7, 2025
Dec 17, 2024
Dec 12, 2024
Dec 12, 2024
Dec 12, 2024
Dec 12, 2024
Dec 12, 2024
Dec 12, 2024
Dec 12, 2024
Dec 12, 2024
Dec 12, 2024
Dec 12, 2024
Dec 12, 2024
Dec 12, 2024
Dec 12, 2024
Dec 12, 2024
Aug 13, 2024
Aug 13, 2024
Jul 30, 2024
Jul 25, 2024
Jul 25, 2024
Jul 25, 2024
Jul 25, 2024
Jul 25, 2024
Jul 25, 2024
Jul 25, 2024
Jul 25, 2024
Jul 25, 2024
Jul 25, 2024
Jul 25, 2024
Jul 25, 2024
Jul 25, 2024
Jul 25, 2024
Jul 25, 2024
Jul 25, 2024
Jul 25, 2024
Jul 25, 2024
Jul 25, 2024
Jul 25, 2024
Nov 14, 2023
Oct 6, 2023
Sep 6, 2023
Sep 6, 2023
Sep 6, 2023
Sep 6, 2023
Sep 6, 2023
Jun 5, 2023
Jun 5, 2023
Jun 5, 2023
Jun 5, 2023
Jun 5, 2023
Jun 5, 2023
Jan 18, 2023
Jan 18, 2023
Jan 18, 2023
Jan 18, 2023
Nov 14, 2022
Nov 14, 2022
Nov 4, 2022
Oct 17, 2022
Oct 17, 2022
Oct 17, 2022
Oct 17, 2022
Oct 17, 2022
Oct 17, 2022
Oct 17, 2022
May 3, 2022
Mar 30, 2022
Mar 3, 2022
Mar 3, 2022
Mar 3, 2022
Mar 3, 2022
Feb 21, 2022
Sep 16, 2021
Sep 14, 2021
Sep 14, 2021
Sep 14, 2021
Sep 14, 2021
Sep 14, 2021
Sep 14, 2021
Sep 14, 2021
Sep 14, 2021