Patent No. EP3453686 (titled "Lithium Silicate Glass Ceramic And Glass With Zro2 Content") was filed by Ivoclar Vivadent on Apr 18, 2011. The application was issued on Dec 30, 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 |
|---|---|---|
| DENTSPLY SIRONA | Sep 30, 2021 | FINNEGAN |
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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Jun 20, 2011