Patent No. EP2904435 (titled "Optical Light Diffuser And Method For Measurement Thereof") was filed by Arkema France on Sep 27, 2013. The application was issued on Nov 27, 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 |
|---|---|---|
| ROHM | Aug 22, 2025 | WINKENSTETTE |
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 19, 2026
Jan 14, 2026
Jan 14, 2026
Jan 14, 2026
Jan 14, 2026
Jan 14, 2026
Jan 14, 2026
Jan 14, 2026
Jan 14, 2026
Jan 14, 2026
Sep 18, 2025
Sep 18, 2025
Sep 16, 2025
Sep 10, 2025
Sep 10, 2025
Sep 10, 2025
Sep 10, 2025
Sep 10, 2025
Sep 10, 2025
Sep 8, 2025
Sep 1, 2025
Aug 27, 2025
Aug 22, 2025
Aug 22, 2025
Aug 22, 2025
Aug 22, 2025
Aug 22, 2025
Aug 22, 2025
Aug 22, 2025
Aug 22, 2025
Aug 22, 2025
Aug 22, 2025
Aug 22, 2025
Aug 22, 2025
Aug 22, 2025
Aug 22, 2025
Aug 22, 2025
Aug 22, 2025
Aug 22, 2025
Aug 22, 2025
Dec 10, 2024
Oct 31, 2024
Oct 25, 2024
Oct 21, 2024
Oct 21, 2024
Oct 21, 2024
Oct 21, 2024
Oct 21, 2024
Jun 25, 2024
Jun 25, 2024
Jun 25, 2024
Jun 25, 2024
Jun 25, 2024
Jun 25, 2024
Dec 15, 2023
Dec 4, 2023
Dec 4, 2023
Dec 4, 2023
Dec 16, 2022
Dec 16, 2022
Dec 16, 2022
Dec 16, 2022
Dec 16, 2022
Sep 5, 2022
Sep 5, 2022
Feb 24, 2022
Feb 24, 2022
Feb 8, 2022
Jan 26, 2022
Jan 26, 2022
Jan 26, 2022
Sep 7, 2021
Sep 2, 2021
Sep 2, 2021
Aug 11, 2021
Jul 21, 2021
Jul 21, 2021
Jul 21, 2021
Jun 28, 2021
Jun 22, 2021
Jun 21, 2021
Jun 21, 2021
Jun 21, 2021
Jun 21, 2021
Jun 15, 2021
Jun 15, 2021
Apr 3, 2020
Apr 3, 2020
Apr 3, 2020
Apr 3, 2020
Apr 3, 2020
Feb 7, 2020
Feb 4, 2020
Feb 4, 2020
Feb 4, 2020
Sep 30, 2019
Sep 30, 2019
Sep 23, 2019
Jun 14, 2019
Mar 17, 2017
Mar 17, 2017
Mar 17, 2017
Mar 17, 2017
Mar 17, 2017
Sep 23, 2016
Sep 7, 2016
Sep 7, 2016
Sep 7, 2016
Sep 7, 2016
May 19, 2016
May 19, 2016
May 19, 2016
May 2, 2016
Jul 15, 2015
May 11, 2015
May 7, 2015
May 7, 2015
May 7, 2015
May 7, 2015
May 7, 2015
Apr 21, 2015
Apr 3, 2015
Apr 3, 2015
Apr 3, 2015
Apr 3, 2015
Apr 3, 2015
Apr 3, 2015
Feb 13, 2015
Jun 26, 2014
Jun 26, 2014
Apr 30, 2014
Apr 10, 2014