Patent No. EP3434767 (titled "Cytotoxicity-Inducing Therapeutic Agent") was filed by Chugai Seiyaku Kabushiki Kaisha on Nov 30, 2011. The application was issued on Jan 7, 2026.

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 |
|---|---|---|
| STRAWMAN | Sep 29, 2026 | GREAVES BREWSTER |
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
Sep 29, 2026
Sep 29, 2026
Sep 29, 2026
Sep 29, 2026
Sep 29, 2026
Sep 29, 2026
Sep 29, 2026
Sep 29, 2026
Sep 29, 2026
Sep 29, 2026
Sep 29, 2026
Sep 29, 2026
Sep 29, 2026
Sep 29, 2026
Sep 29, 2026
Sep 29, 2026
Sep 29, 2026
Sep 29, 2026
Sep 29, 2026
Sep 29, 2026
Sep 29, 2026
Feb 20, 2026
Feb 20, 2026
Jan 20, 2026
Dec 11, 2025
Nov 27, 2025
Nov 18, 2025
Nov 10, 2025
Nov 10, 2025
Nov 10, 2025
Oct 22, 2025
Oct 22, 2025
Oct 22, 2025
Oct 22, 2025
Oct 21, 2025
Oct 21, 2025
Oct 21, 2025
Oct 21, 2025
Oct 21, 2025
Oct 21, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
May 28, 2025
May 20, 2025
May 16, 2025
May 15, 2025
May 15, 2025
Apr 22, 2025
Apr 22, 2025
Apr 22, 2025
Apr 22, 2025
Apr 22, 2025
Apr 16, 2025
Apr 16, 2025
Apr 16, 2025
Feb 14, 2025
Feb 14, 2025
Feb 13, 2025
Feb 13, 2025
Feb 13, 2025
Feb 13, 2025
Feb 13, 2025
Feb 13, 2025
Feb 13, 2025
Feb 13, 2025
Feb 11, 2025
Feb 11, 2025
Feb 11, 2025
Feb 4, 2025
Feb 4, 2025
Feb 4, 2025
Feb 4, 2025
Feb 4, 2025
Feb 3, 2025
Feb 3, 2025
Feb 3, 2025
Feb 3, 2025
Jan 30, 2025
Jan 30, 2025
Jan 30, 2025
Jan 30, 2025
Jan 24, 2025
Jan 24, 2025
Jan 17, 2025
Jan 17, 2025
Jan 17, 2025
Jan 13, 2025
Jan 13, 2025
Jan 13, 2025
Jan 13, 2025
Jan 13, 2025
Jan 13, 2025
Jan 13, 2025
Jan 13, 2025
Jan 13, 2025
Jan 13, 2025
Jan 13, 2025
Jan 13, 2025
Jan 13, 2025
Jan 13, 2025
Jan 13, 2025
Jan 13, 2025
Jan 13, 2025
Jan 13, 2025
Jan 13, 2025
Dec 16, 2024
Dec 16, 2024
Dec 16, 2024
Oct 21, 2024
Oct 21, 2024
Oct 21, 2024
Oct 21, 2024
Oct 21, 2024
Oct 21, 2024
Oct 21, 2024
Oct 21, 2024
Oct 21, 2024
Oct 21, 2024
Oct 21, 2024
Oct 21, 2024
Oct 21, 2024
Oct 21, 2024
Oct 21, 2024
Oct 21, 2024
Oct 21, 2024
May 24, 2024
May 24, 2024
Apr 29, 2024
Apr 29, 2024
Apr 29, 2024
Apr 29, 2024
Apr 29, 2024
Apr 29, 2024
Apr 29, 2024
Apr 23, 2024
Apr 18, 2024
Apr 18, 2024
Apr 18, 2024
Dec 18, 2023
Dec 18, 2023
Dec 5, 2023
Nov 24, 2023
Nov 24, 2023
Nov 24, 2023
Nov 30, 2022
Oct 10, 2022
Oct 3, 2022
Oct 3, 2022
Oct 3, 2022
Oct 3, 2022
Oct 3, 2022
Oct 3, 2022
Oct 3, 2022
Oct 3, 2022
Oct 3, 2022
Sep 26, 2022
Sep 20, 2022
Sep 20, 2022
Aug 19, 2022
Aug 19, 2022
Aug 19, 2022
Aug 19, 2022
Aug 19, 2022
Jun 29, 2022
Jun 24, 2022
Jun 24, 2022
Jun 24, 2022
Feb 17, 2022
Feb 17, 2022
Feb 15, 2022
Feb 9, 2022
Feb 9, 2022
Oct 28, 2021
Oct 14, 2021
Oct 14, 2021
Oct 14, 2021
Oct 14, 2021
Sep 28, 2021
Sep 28, 2021
Sep 28, 2021
Sep 28, 2021
Sep 28, 2021
Sep 28, 2021
Sep 28, 2021
Sep 28, 2021
Sep 28, 2021
Sep 28, 2021
Jul 30, 2021
Jul 27, 2021
Jul 27, 2021
Jul 27, 2021
Jun 4, 2021
May 28, 2021
May 28, 2021
May 28, 2021
Mar 19, 2021
Mar 19, 2021
Nov 24, 2020
Nov 17, 2020
Nov 17, 2020
Nov 17, 2020
Nov 17, 2020
Nov 17, 2020
Sep 8, 2020
Jun 17, 2020
Jun 12, 2020
Jun 12, 2020
Jun 12, 2020
Apr 8, 2020
Apr 3, 2020
Apr 3, 2020
Apr 3, 2020
Dec 5, 2019
Dec 5, 2019
Nov 29, 2019
Jul 26, 2019
Jul 26, 2019
Jul 26, 2019
Jul 26, 2019
Jul 26, 2019
Feb 4, 2019
Jan 4, 2019
Dec 28, 2018
Dec 21, 2018
Oct 31, 2018
Oct 30, 2018
Oct 30, 2018
Oct 30, 2018
Oct 30, 2018
Oct 30, 2018
Oct 30, 2018
Oct 30, 2018
Oct 25, 2018
Oct 25, 2018
Oct 25, 2018
Oct 25, 2018
Oct 16, 2018
Sep 6, 2018
Sep 6, 2018
Sep 6, 2018
Sep 6, 2018
Sep 6, 2018
Sep 6, 2018
Sep 6, 2018
Sep 6, 2018
Jun 28, 2012
Jun 28, 2012
Jun 28, 2012