Patent No. EP3574370 (titled "Computer-Implemented Method For Determining A Representation Of A Rim Of A Spectacles Frame Or A Representation Of The Edges Of The Spectacle Lenses") was filed by Carl Zeiss on Jan 24, 2018. The application was issued on Jun 17, 2020.

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 |
|---|---|---|
| MATHYS & SQUIRE GBR | Mar 18, 2021 | WIETZKE |
| MATHYS & SQUIRE EUROPE | Mar 18, 2021 | WIETZKE |
| RODENSTOCK | Mar 17, 2021 | 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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