Patent No. EP3402177 (titled "Signal Detection And Blocking For Voice Processing Equipment") was filed by Semafone on May 8, 2009. The application was issued on Jul 7, 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 |
|---|---|---|
| ECKOH ECKOH UK | Apr 7, 2022 | DENTONS UK AND MIDDLE EAST |
| PCI PAL UK | Apr 7, 2022 | DUMMETT COPP |
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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