Patent No. EP3321831 (titled "Device For Determining Predicted Subjective Refraction Data Or Predicted Subjective Correction Data And Computer Program") was filed by Carl Zeiss on Nov 14, 2016. The application was issued on Jun 26, 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 |
|---|---|---|
| CARL ZEISS VISION | Mar 26, 2020 | ZERBIB |
| ESSILOR | Mar 26, 2020 | ZERBIB |
| RODENSTOCK | Mar 25, 2020 | MULLER BORE & PARTNER PATENTANWALTE PARTG MBB |
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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