Patent No. EP2649259 (titled "Operator-Friendly Fitting For Sashes Which Can Be Displaced In Parallel") was filed by Hautau on Dec 12, 2011. The application was issued on Nov 27, 2019.

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 |
|---|---|---|
| ROTO FRANK AG | Oct 11, 2017 | KOHLER SCHMID MOBUS PATENTANWALTE |
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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