Patent No. EP2344445 (titled "A Process To Selectively Manufacture Diethylenetriamine (Deta) Or Other Desirable Ethylenamines Via Continuous Transamination Of Ethylenediamine (Eda), And Other Ethyleneamines Over A Heterogeneous Catalyst System") was filed by Union Carbide on Oct 6, 2009. The application was issued on May 10, 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 |
|---|---|---|
| AKZO NOBEL CHEMICALS | Feb 9, 2018 | AKZO NOBEL DEPARTMENT |
| NOURYON CHEMICALS | Feb 9, 2018 | INGRASSIA |
| NOURYON CHEMICALS | Feb 9, 2018 | LKGLOBAL UK |
| BASF | Jan 30, 2018 | BASF ASSOCIATION |
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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