Patent No. EP3616830 (titled "High Frequency Vibration Spindle System With Noncontact Power Transmission And Method For Manufacturing A Restraining Part Used Therein") was filed by National Chung Hsing University on Aug 14, 2019. The application was issued on Feb 28, 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 |
|---|---|---|
| DMG MORI ULTRASONIC LASERTEC | Nov 21, 2024 | MERH MATIAS ERNY REICHL HOFFMANN 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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