Patent No. EP3690520 (titled "Finished Uncut Spectacle Lens, Semi-Finished Lens Blank And Method Of Manufacturing A Spectacle Lens") was filed by Carl Zeiss on Jan 30, 2019. The application was issued on Jun 12, 2024.

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 |
|---|---|---|
| RODENSTOCK | Mar 12, 2025 | 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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