Patent No. EP2657237 (titled "Novel Cyclic Amine Compound, And Process For Producing Polyurethane Resin Using Same") was filed by Tosoh on Dec 22, 2011. The application was issued on May 20, 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 |
|---|---|---|
| AIR PRODUCTS AND CHEMICALS | Feb 3, 2016 | ANDRAE WESTENDORP |
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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