Patent No. EP1888920 (titled "Vacuum Pump For Vehicle Motors And A One-Way Valve For Said Vacuum Pump") was filed by OMP Officine Mazzocco Pagnoni on May 22, 2006. The application was issued on Sep 2, 2015.

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 |
|---|---|---|
| PIERBURG PUMP TECHNOLOGY | Mar 18, 2016 | PATENTANWALTE TER SMITTEN EBERLEIN-VAN HOOF RUTTEN PARTNERSCHAFTSGESELLSCHAFT 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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