Patent No. EP2805807 (titled "Material Mixture Of Epdm, Ethylene-Propylene Copolymer And Sulfur For Seals Of Doors And Windows") was filed by Semperit Holding on May 19, 2014. The application was issued on Oct 11, 2017.

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 |
|---|---|---|
| TRELLEBORG SEALING PROFILES GERMANY | Jul 10, 2018 | FLUGEL PREISSNER SCHOBER SEIDEL |
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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