Patent No. EP2059771 (titled "Apparatus For Measuring The Volumetric And Mass Flow Of A Medium In A Pipeline") was filed by Endress Hauser Flowtec on Aug 31, 2007. The application was issued on Mar 1, 2017.

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.
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.
Date
Description