Patent No. EP2958151 (titled "Resin Composition For Solar Cell Sealing Materials, Solar Cell Sealing Material Using Same, And Solar Cell Module") was filed by Japan Polyethylene on Feb 13, 2014. The application was issued on Oct 10, 2018.

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 |
|---|---|---|
| THE DOW CHEMICAL | Jul 10, 2019 | BOULT WADE TENNANT |
| BOREALIS | Jul 9, 2019 | DEHNS |
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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