Patent No. EP4161562 (titled "High Dose And Low Volume Botulinum Toxin Treatment Of Facial Wrinkles") was filed by Merz Pharma on Jun 4, 2021. The application was issued on Nov 20, 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 |
|---|---|---|
| IPSEN BIOPHARMA | Aug 20, 2025 | MATHYS & SQUIRE |
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 5, 2026
Dec 22, 2025
Dec 22, 2025
Dec 22, 2025
Dec 22, 2025
Dec 22, 2025
Dec 22, 2025
Dec 22, 2025
Dec 22, 2025
Dec 22, 2025
Dec 22, 2025
Dec 22, 2025
Dec 22, 2025
Dec 22, 2025
Dec 22, 2025
Oct 31, 2025
Oct 24, 2025
Oct 24, 2025
Oct 24, 2025
Oct 24, 2025
Oct 7, 2025
Oct 7, 2025
Oct 1, 2025
Oct 1, 2025
Oct 1, 2025
Oct 1, 2025
Oct 1, 2025
Oct 1, 2025
Oct 1, 2025
Oct 1, 2025
Oct 1, 2025
Oct 1, 2025
Sep 1, 2025
Sep 1, 2025
Aug 26, 2025
Aug 26, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Aug 20, 2025
Dec 3, 2024
Oct 24, 2024
Oct 15, 2024
Oct 15, 2024
Oct 15, 2024
Oct 15, 2024
Jun 17, 2024
Jun 17, 2024
Jun 17, 2024
Jun 17, 2024
Jun 17, 2024
Jun 17, 2024
Feb 8, 2024
Feb 8, 2024
Feb 8, 2024
Feb 8, 2024
Feb 8, 2024
Feb 8, 2024
Feb 8, 2024
Dec 22, 2023
Dec 22, 2023
Dec 15, 2023
Jul 5, 2023
Jul 5, 2023
Jul 5, 2023
Jul 5, 2023
Jul 5, 2023
Mar 15, 2023
Jan 17, 2023
Jan 10, 2023
Dec 23, 2022
Dec 23, 2022
Dec 19, 2022
Dec 1, 2022
Dec 1, 2022
Dec 1, 2022
Dec 1, 2022
Dec 1, 2022
Dec 1, 2022
Dec 1, 2022
Dec 1, 2022
Dec 1, 2022
Dec 1, 2022
Dec 1, 2022
Dec 1, 2022
Dec 1, 2022
Dec 1, 2022
Dec 1, 2022
Dec 1, 2022
Dec 1, 2022
Dec 1, 2022
Nov 28, 2022
Nov 28, 2022
Nov 28, 2022
Oct 13, 2022
Jan 3, 2022
Dec 9, 2021
Dec 9, 2021
Aug 27, 2021
Aug 24, 2021
Aug 24, 2021
Aug 24, 2021
Aug 24, 2021
Jun 11, 2021
Jun 10, 2021
Jun 7, 2021
Jun 4, 2021
Jun 4, 2021
Jun 4, 2021
Jun 4, 2021
Jun 4, 2021
Jun 4, 2021