Patent No. EP3681539 (titled "Iron Complex Compounds For Therapeutic Use") was filed by Pharmacosmos Holding on Sep 10, 2018. The application was issued on Jan 1, 2025.
Iron complex compounds with low levels of impurities like arsenic, chromium, lead, mercury, cadmium, and aluminum for safe administration to humans and animals. The compounds are iron carbohydrate complexes like hydrogenated oligoisomaltose. They are made by a process involving extracting iron from an aqueous solution with an organic solvent. This removes impurities. The resulting iron complex is purer and safer than conventional iron preparations.

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 |
|---|---|---|
| BARDEHLE PAGENBERG | Oct 1, 2025 | BARDEHLE PAGENBERG SL |
| BRIGHTGENE BIO MEDICAL TECHNOLOGY | Oct 1, 2025 | PLASSERAUD |
| SANDOZ | Oct 1, 2025 | ELKINGTON AND FIFE |
| INTERQUIM | Sep 30, 2025 | FERRER INTERNACIONAL |
| SCORPIO | Sep 30, 2025 | SAGITTARIUS |
| ZIMMERMANN & PARTNER PATENTANWALTE MBB | Sep 30, 2025 | ZIMMERMANN & PARTNER PATENTANWALTE MBB |
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 9, 2026
Jan 9, 2026
Jan 9, 2026
Jan 9, 2026
Jan 9, 2026
Jan 9, 2026
Jan 9, 2026
Jan 5, 2026
Jan 5, 2026
Jan 5, 2026
Jan 5, 2026
Jan 5, 2026
Jan 5, 2026
Dec 18, 2025
Dec 18, 2025
Dec 18, 2025
Oct 16, 2025
Oct 16, 2025
Oct 16, 2025
Oct 16, 2025
Oct 16, 2025
Oct 16, 2025
Oct 16, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 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
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
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
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
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
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 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Sep 30, 2025
Jan 14, 2025
Dec 5, 2024
Nov 26, 2024
Nov 26, 2024
Nov 26, 2024
Nov 26, 2024
Nov 26, 2024
Jul 26, 2024
Jul 26, 2024
Jul 26, 2024
Jul 26, 2024
Jul 26, 2024
Jul 26, 2024
Jun 25, 2024
Jun 25, 2024
Jun 25, 2024
Jun 25, 2024
Jun 25, 2024
Jun 25, 2024
Jun 25, 2024
May 13, 2024
May 13, 2024
May 13, 2024
May 13, 2024
May 13, 2024
May 13, 2024
Apr 12, 2024
Apr 12, 2024
Apr 8, 2024
Apr 8, 2024
Apr 8, 2024
Apr 8, 2024
Apr 8, 2024
Feb 12, 2024
Feb 12, 2024
Feb 12, 2024
Feb 12, 2024
Feb 12, 2024
Feb 12, 2024
Feb 12, 2024
Nov 3, 2023
Nov 3, 2023
Oct 24, 2023
Oct 23, 2023
Oct 23, 2023
Oct 23, 2023
Oct 23, 2023
Oct 23, 2023
Oct 20, 2023
Oct 20, 2023
Oct 20, 2023
Aug 24, 2023
Aug 21, 2023
Aug 21, 2023
Aug 21, 2023
Apr 12, 2023
Apr 12, 2023
Apr 4, 2023
Feb 10, 2021
Feb 2, 2021
Feb 2, 2021
Feb 2, 2021
Feb 2, 2021
Feb 2, 2021
Feb 2, 2021
Feb 2, 2021
Feb 2, 2021
Feb 2, 2021
Feb 2, 2021
Nov 24, 2020
Jun 24, 2020
Apr 21, 2020
Apr 17, 2020
Apr 17, 2020
Apr 14, 2020
Mar 31, 2020
Mar 19, 2020
Mar 17, 2020
Mar 17, 2020
Mar 10, 2020
Mar 10, 2020
Mar 5, 2020
Mar 5, 2020
Mar 5, 2020
Mar 5, 2020
Feb 11, 2020
Feb 11, 2020
Jan 17, 2020
Apr 2, 2019
Mar 14, 2019
Mar 14, 2019
Oct 17, 2018
Oct 17, 2018
Oct 17, 2018
Sep 18, 2018
Sep 10, 2018
Sep 10, 2018
Sep 10, 2018
Sep 10, 2018
Sep 10, 2018
Sep 10, 2018
Sep 10, 2018