Patent No. EP1738383 (titled "Signaling Device For A Protective Circuit") was filed by Pilz on Mar 23, 2005. The application was issued on Jan 11, 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 |
|---|---|---|
| ELOBAU | Jun 21, 2019 | VKK PATENTANWALTE PARTG MBB |
| KA SCHMERSAL | Feb 5, 2011 | SPARING ROHL HENSELER |
| EUCHNER | Feb 4, 2011 | RUCKH |
| SICK | Feb 2, 2011 | - |
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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