Patent No. EP3221529 (titled "Gypsum Panels, Cores, And Methods For The Manufacture Thereof") was filed by Georgia Pacific Gypsum on Nov 17, 2015. The application was issued on Dec 23, 2020.

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 |
|---|---|---|
| SAINT GOBAIN | Sep 22, 2021 | MURGITROYD |
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 22, 2026
Jan 16, 2026
Jan 16, 2026
Jan 16, 2026
Dec 22, 2025
Dec 22, 2025
Dec 10, 2025
Dec 4, 2025
Dec 4, 2025
Dec 4, 2025
Nov 26, 2025
Nov 26, 2025
Nov 21, 2025
Aug 27, 2025
Aug 21, 2025
Aug 21, 2025
Aug 21, 2025
Aug 21, 2025
Aug 21, 2025
Aug 21, 2025
Apr 25, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 17, 2025
Apr 14, 2025
Feb 24, 2025
Feb 24, 2025
Feb 18, 2025
Feb 18, 2025
Feb 18, 2025
Jan 31, 2025
Jan 31, 2025
Jan 15, 2025
Jan 10, 2025
Jan 10, 2025
Jan 10, 2025
Dec 19, 2024
Dec 19, 2024
Dec 19, 2024
Dec 19, 2024
Dec 19, 2024
Dec 19, 2024
Dec 19, 2024
Dec 19, 2024
Dec 19, 2024
Dec 19, 2024
Dec 19, 2024
Dec 19, 2024
Dec 19, 2024
Dec 19, 2024
Dec 19, 2024
Nov 19, 2024
Nov 15, 2024
Nov 14, 2024
Nov 14, 2024
Nov 14, 2024
Nov 14, 2024
Nov 14, 2024
Nov 14, 2024
Nov 14, 2024
Nov 14, 2024
Oct 23, 2024
Oct 18, 2024
Oct 18, 2024
Oct 18, 2024
Sep 26, 2024
Sep 26, 2024
Sep 19, 2024
Sep 19, 2024
Sep 19, 2024
Sep 19, 2024
Sep 19, 2024
Sep 19, 2024
Sep 19, 2024
Sep 19, 2024
Sep 19, 2024
Sep 19, 2024
Sep 19, 2024
Sep 19, 2024
Sep 19, 2024
Sep 19, 2024
Sep 19, 2024
Sep 19, 2024
Sep 19, 2024
Sep 19, 2024
Sep 19, 2024
Sep 19, 2024
Sep 19, 2024
Sep 19, 2024
Sep 19, 2024
Feb 19, 2024
Feb 19, 2024
Feb 19, 2024
Feb 19, 2024
Feb 19, 2024
Feb 19, 2024
Feb 19, 2024
Feb 21, 2022
Feb 16, 2022
Feb 16, 2022
Feb 16, 2022
Dec 7, 2021
Dec 3, 2021
Dec 3, 2021
Nov 29, 2021
Nov 29, 2021
Nov 29, 2021
Nov 29, 2021
Oct 7, 2021
Oct 7, 2021
Sep 28, 2021
Sep 22, 2021
Sep 22, 2021
Sep 22, 2021
Sep 22, 2021
Sep 22, 2021
Sep 22, 2021
Sep 22, 2021
Sep 22, 2021
Sep 22, 2021
Sep 22, 2021
Sep 22, 2021
Sep 22, 2021
Sep 22, 2021
Sep 22, 2021
Sep 22, 2021
Sep 22, 2021
Sep 22, 2021
Sep 22, 2021
Sep 22, 2021
Sep 22, 2021
Sep 22, 2021
Sep 22, 2021
Sep 22, 2021
Sep 22, 2021
Sep 22, 2021
Sep 22, 2021
Sep 22, 2021
Sep 22, 2021
Jan 13, 2021
Nov 26, 2020
Oct 7, 2020
Oct 7, 2020
Oct 7, 2020
Oct 7, 2020
Jun 10, 2020
Jun 10, 2020
Jun 10, 2020
Jun 10, 2020
Jun 10, 2020
Apr 29, 2020
Apr 29, 2020
Apr 29, 2020
Apr 29, 2020
Apr 29, 2020
Apr 29, 2020
Apr 29, 2020
Apr 29, 2020
Mar 13, 2020
Mar 13, 2020
Jun 11, 2019
Jun 11, 2019
Mar 29, 2019
Mar 29, 2019
Mar 25, 2019
Feb 4, 2019
Feb 4, 2019
Jul 24, 2018
Jul 6, 2018
Jul 6, 2018
Jul 6, 2018
Jul 6, 2018
Jan 17, 2018
Jan 17, 2018
Jan 4, 2018
Aug 30, 2017
Jul 7, 2017
Jun 21, 2017
Jun 21, 2017
Jun 7, 2017
May 11, 2017
May 11, 2017
Mar 31, 2017
Jun 13, 2016
May 26, 2016
May 26, 2016