Patent No. EP2170786 (titled "Improved Method For Producing 2-Chloro-3,3,3,-Trifluoropropene (Hcfc-1233Xf)") was filed by Honeywell on Jul 25, 2008. The application was issued on Dec 18, 2019.

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.
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.