Patent No. EP2638321 (titled "Quantum Dot Films, Lighting Devices, And Lighting Methods") was filed by Nanosys on Nov 2, 2011. The application was issued on May 8, 2019.

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 |
|---|---|---|
| HOFFMAN EITLE | Feb 7, 2020 | HOFFMANN EITLE |
| HOFFMANN EITLE | Feb 7, 2020 | HOFFMANN EITLE |
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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