Patent No. EP3841166 (titled "Stabilized Rotomolded Polyolefin") was filed by Basf on Aug 19, 2019. The application was issued on May 7, 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 |
|---|---|---|
| CYTEC INDUSTRIES | Apr 20, 2023 | KRAUS & LEDERER PARTGMBB |
| GRAFE POLYMER SOLUTIONS | Apr 20, 2023 | GLEIM PETRI PATENT UND RECHTSANWALTSPARTNERSCHAFT MBB |
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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