Patent No. EP3946853 (titled "Punching/Perforation Machine And Processing System Comprising A Frame Mechanism For Clamping The Material Unit") was filed by Wista Werkzeugfertigungs on Apr 1, 2020. The application was issued on Jan 17, 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 |
|---|---|---|
| RING MASCHINENBAU | Oct 17, 2024 | WITTE |
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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