Patent No. EP2421839 (titled "Methods For Enhancing The Efficiency Of Rhenium-Promoted Epoxidation Catalysts And Epoxidation Methods Utilizing These") was filed by DOW Technology Investments on Apr 5, 2010. The application was issued on May 7, 2014.

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 |
|---|---|---|
| SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ | Feb 6, 2015 | GAASBEEK |
| BASF | Feb 5, 2015 | HERZOG |
| SCIENTIFIC DESIGN COMPANY INC. | Feb 5, 2015 | 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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