Patent No. EP4179020 (titled "Polyethylene Pipe Resin With High Resistance To Slow Crack Growth") was filed by Borealis on Jul 7, 2021. 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 |
|---|---|---|
| SABIC SABIC PETROCHEMICALS | Sep 25, 2025 | SABIC GROUP |
| THE DOW CHEMICAL | Sep 24, 2025 | BOULT WADE TENNANT |
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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