Patent No. EP3972721 (titled "A Method Of Abating Carbon Dioxide And Hydrogen Sulfide") was filed by Barnard College on May 22, 2020. The application was issued on Apr 30, 2025.

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 |
|---|---|---|
| PROTOSTAR GROUP | Jan 29, 2026 | MARKS & CLERK |
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
Feb 13, 2026
Feb 13, 2026
Feb 3, 2026
Jan 29, 2026
Jan 29, 2026
Jan 29, 2026
Jan 29, 2026
Jan 29, 2026
Jan 29, 2026
Jan 29, 2026
Jan 29, 2026
Jan 29, 2026
Jan 29, 2026
Jan 29, 2026
Jan 29, 2026
Jan 29, 2026
Jan 29, 2026
Jan 29, 2026
Jan 29, 2026
Jan 29, 2026
Jan 29, 2026
Jan 29, 2026
Oct 14, 2025
Aug 14, 2025
Aug 12, 2025
Aug 7, 2025
Aug 7, 2025
May 16, 2025
May 13, 2025
Apr 3, 2025
Mar 25, 2025
Mar 25, 2025
Mar 25, 2025
Mar 25, 2025
Mar 20, 2025
Mar 14, 2025
Mar 14, 2025
Mar 14, 2025
Mar 14, 2025
Mar 14, 2025
Mar 14, 2025
Mar 13, 2025
Mar 13, 2025
Mar 13, 2025
Mar 13, 2025
Dec 19, 2024
Dec 16, 2024
Dec 16, 2024
Dec 16, 2024
Dec 12, 2024
Dec 12, 2024
Dec 12, 2024
Dec 12, 2024
Dec 12, 2024
Dec 12, 2024
Oct 25, 2024
Oct 25, 2024
Oct 25, 2024
Oct 25, 2024
Oct 25, 2024
Oct 25, 2024
Oct 25, 2024
Oct 25, 2024
Oct 25, 2024
Aug 23, 2024
Aug 23, 2024
Aug 23, 2024
Aug 23, 2024
Aug 23, 2024
Aug 23, 2024
May 15, 2024
May 15, 2024
May 15, 2024
May 15, 2024
May 15, 2024
May 15, 2024
May 15, 2024
May 6, 2024
May 6, 2024
Feb 6, 2024
Feb 6, 2024
Feb 6, 2024
Feb 6, 2024
Feb 6, 2024
Oct 6, 2023
Oct 6, 2023
Sep 6, 2023
Aug 23, 2023
Aug 23, 2023
Aug 23, 2023
Jun 6, 2023
Jun 6, 2023
Jun 6, 2023
Jun 6, 2023
Jun 6, 2023
May 10, 2023
May 10, 2023
May 10, 2023
Apr 21, 2023
Apr 21, 2023
Mar 29, 2023
Dec 22, 2022
Dec 22, 2022
Dec 22, 2022
May 18, 2022
May 18, 2022
May 18, 2022
May 18, 2022
May 18, 2022
Mar 22, 2022
Mar 2, 2022
Jan 10, 2022
Dec 23, 2021
Dec 17, 2021
Dec 17, 2021
Nov 29, 2021
Nov 9, 2021
Nov 9, 2021
Nov 9, 2021
Nov 9, 2021
Nov 9, 2021
Nov 9, 2021
Nov 9, 2021
Nov 4, 2021
Nov 4, 2021
Nov 4, 2021
Nov 4, 2021
Oct 27, 2021
Oct 27, 2021
Oct 27, 2021
Oct 1, 2021
Sep 13, 2021
Sep 13, 2021
Sep 13, 2021
Sep 13, 2021
Sep 13, 2021
Sep 7, 2021
Apr 8, 2021
Apr 8, 2021
Apr 8, 2021
Apr 8, 2021
Apr 8, 2021
Feb 19, 2021
Feb 19, 2021
Feb 19, 2021
Jan 29, 2021
Jan 20, 2021
Jan 12, 2021
Jan 12, 2021
Jan 12, 2021
Jan 12, 2021
Jan 12, 2021
Jan 12, 2021
Dec 14, 2020
Nov 26, 2020
Nov 26, 2020
Aug 7, 2020
Aug 7, 2020
Aug 7, 2020
Aug 7, 2020
Jun 9, 2020
Jun 3, 2020
Jun 3, 2020
May 29, 2020
May 22, 2020
May 22, 2020
May 22, 2020
May 22, 2020
May 22, 2020
May 22, 2020
May 22, 2020
May 22, 2020
May 22, 2020