Patent No. EP1486550 (titled "Material For Organic Electroluminescent Devices And Organic Electroluminescent Devices Made By Using The Same") was filed by Idemitsu Kosan on Mar 13, 2003. The application was issued on May 21, 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 |
|---|---|---|
| MERCK PATENT | Feb 11, 2015 | BREUNING |
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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