Patent No. EP3972851 (titled "Use Of Nanoparticles To Tune Index Of Refraction Of Layers Of A Polymeric Matrix To Optimize Microoptic (Mo) Focus") was filed by Crane on May 20, 2020. The application was issued on Feb 28, 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 |
|---|---|---|
| LEONHARD KURZ STIFTUNG | Nov 28, 2024 | ZINSINGER |
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
Jun 29, 2026
Jun 29, 2026
Jun 29, 2026
Jun 29, 2026
Jun 29, 2026
Jun 29, 2026
Jun 29, 2026
Jun 29, 2026
Jun 29, 2026
Jun 29, 2026
Jun 29, 2026
Jun 29, 2026
Jun 29, 2026
Jun 29, 2026
May 12, 2026
May 8, 2026
May 5, 2026
May 5, 2026
May 5, 2026
Mar 17, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Mar 12, 2026
Nov 21, 2025
Nov 18, 2025
Nov 18, 2025
Nov 18, 2025
Nov 13, 2025
Nov 13, 2025
Nov 13, 2025
Nov 13, 2025
Nov 13, 2025
Apr 22, 2025
Apr 14, 2025
Apr 14, 2025
Apr 14, 2025
Apr 14, 2025
Apr 14, 2025
Dec 12, 2024
Dec 12, 2024
Dec 4, 2024
Nov 28, 2024
Nov 28, 2024
Nov 28, 2024
Nov 28, 2024
Nov 28, 2024
Nov 28, 2024
Nov 28, 2024
Nov 28, 2024
Nov 28, 2024
Nov 28, 2024
Nov 28, 2024
Nov 28, 2024
Mar 13, 2024
Feb 1, 2024
Jan 24, 2024
Jan 24, 2024
Jan 24, 2024
Jan 24, 2024
Oct 13, 2023
Oct 13, 2023
Oct 13, 2023
Oct 13, 2023
Oct 13, 2023
Oct 13, 2023
Sep 12, 2023
Sep 12, 2023
Sep 12, 2023
Jun 15, 2023
Jun 15, 2023
Jun 15, 2023
Jun 15, 2023
Jun 15, 2023
Jun 15, 2023
Jun 15, 2023
Feb 17, 2023
Feb 17, 2023
Feb 14, 2023
Nov 23, 2022
Nov 23, 2022
Nov 23, 2022
Nov 23, 2022
Nov 23, 2022
Jun 28, 2022
Jun 10, 2022
Jun 10, 2022
Jun 10, 2022
Jun 10, 2022
May 9, 2022
Mar 2, 2022
Dec 6, 2021
Nov 26, 2021
Nov 19, 2021
Nov 19, 2021
Nov 19, 2021
Oct 1, 2021
Feb 18, 2021
Dec 14, 2020
Dec 14, 2020
Nov 26, 2020
Nov 26, 2020