Patent No. EP4190882 (titled "Use With Alkylene Oxide And Hydrocarbyl-Substituted Polycarboxylic Acid Of Quaternised Nitrogen Compounds As Additives In Fuels And Lubricants") was filed by Basf on Jun 6, 2014. The application was issued on Dec 25, 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 |
|---|---|---|
| INNOSPEC | Sep 24, 2025 | APPLEYARD LEES |
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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