Patent No. EP3320004 (titled "Ziegler-Natta-Metallocene Dual Catalyst Systems With Activator-Supports") was filed by Chevron Phillips Chemical LP on Jun 28, 2016. The application was issued on Dec 6, 2023.

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 |
|---|---|---|
| BOREALIS | May 12, 2021 | DEHNS |
| TOTALENERGIES ONETECH BELGIUM | May 12, 2021 | GARCIA MARTIN |
| THE DOW CHEMICAL | May 11, 2021 | VO |
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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