Patent No. EP3585862 (titled "Blended Fuel Compositions With Improved Emissions Profiles") was filed by REG Synthetic Fuels on Jan 16, 2019. The application was issued on Mar 19, 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 |
|---|---|---|
| TOTALENERGIES ONETECH | Dec 17, 2025 | CASALONGA |
| NESTE OYJ | Dec 16, 2025 | ZACCO DENMARK |
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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