Patent No. EP3427928 (titled "Joining System, Method For Producing A Product Using A Joining System And Product Produced Thereby") was filed by Kiefel on Sep 27, 2013. The application was issued on Sep 15, 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 |
|---|---|---|
| PLUMAT MASCHINENBAU VERTRIEBS | Jun 15, 2022 | SONNENBERG HARRISON PARTNERSCHAFT 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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