Patent No. EP3271136 (titled "Sonotrode For An Ultrasound Welding System And Method For Welding A Connection Element To A Component") was filed by Rehau on Mar 15, 2016. The application was issued on Apr 19, 2023.

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 |
|---|---|---|
| TELSONIC HOLDING | Jan 29, 2021 | HEPP WENGER RYFFEL |
| SONOTRONIC NAGEL | Jan 28, 2021 | WEIDNER STERN JESCHKE |
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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