Patent No. EP3681915 (titled "Aqueous Polymer Dispersions, A Method For Their Preparation And The Use Thereof As Pour-Point Depressants For Crude Oil, Petroleum, And Petroleum Products") was filed by Basf on Sep 10, 2018. The application was issued on Nov 24, 2021.

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 |
|---|---|---|
| CLARIANT PRODUKTE DEUTSCHLAND | Jul 19, 2022 | CLARIANT PRODUKTE DEUTSCHLAND |
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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