Patent No. EP3604617 (titled "Water Electrolysis System, Water Electrolysis Method And Method For Producing Hydrogen") was filed by Asahi Kasei Kabushiki Kaisha on Mar 23, 2018. The application was issued on May 22, 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 |
|---|---|---|
| SUNFIRE | Feb 21, 2025 | EPPING HERMANN FISCHER |
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.
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