Patent No. EP3659547 (titled "Method And Slip For Producing Ceramic Moulded Bodies Made Of Zirconium By Means Of 3D Ink Jet Printing") was filed by Ivoclar Vivadent on Nov 29, 2018. The application was issued on Nov 17, 2021.

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 |
|---|---|---|
| VITA ZAHNFABRIK H RAUTER | Aug 17, 2022 | DOMPATENT VON KREISLER SELTING WERNER |
| VITA ZAHNFABRIK H RAUTER | Aug 17, 2022 | DOMPATENT VON PATENT UND RECHTSANWALTEN |
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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