Patent No. EP3614472 (titled "Catalyst For Solid Polymer Electrolyte Fuel Cells And Method For Producing Same") was filed by Tanaka Kikinzoku Kogyo KK on Apr 16, 2018. The application was issued on Jun 11, 2025.

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 |
|---|---|---|
| MARKS & CLERK | Apr 28, 2022 | MARKS & CLERK |
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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