Patent No. EP1501672 (titled "Interlayer Composite Structure For Laminating Glass With Controlled Diffusing Properties At High Transmission And A Process For Making Same") was filed by EI DU Pont DE Nemours on May 2, 2003. The application was issued on Feb 25, 2015.

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 |
|---|---|---|
| SEKISUI CHEMICAL | Nov 25, 2015 | CABINET BEAU DE LOMENIE |
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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