Patent No. EP2306495 (titled "Very High Efficiency Organic Light Emitting Devices Based On Electrophosphorescence") was filed by The Trustees OF Princeton University on May 11, 2000. The application was issued on Apr 19, 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 |
|---|---|---|
| MERCK | Jan 17, 2018 | - |
| MERCK PATENT | Jan 17, 2018 | - |
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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