Patent No. EP2277977 (titled "Compositions Containing Fluorine Substituted Olefins") was filed by Honeywell on Apr 29, 2005. The application was issued on Sep 19, 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 |
|---|---|---|
| MEXICHEM FLUOR DE CV | Jun 19, 2019 | POTTER CLARKSON |
| ARKEMA FRANCE | Mar 26, 2019 | BANDPAY & GREUTER |
| SINO RESOURCE IMP & EXP | Feb 14, 2019 | COHAUSZ & FLORACK |
| ZHEJIANG HUANXIN FLUORO MATERIAL | Feb 6, 2019 | DOMPATENT VON KREISLER SELTING WERNER |
| ZHEJIANG HUANXIN FLUORO MATERIAL | Feb 6, 2019 | DOMPATENT VON PATENT UND RECHTSANWALTEN |
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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