Patent No. EP1816300 (titled "Window Sash, In Partucular For A Roof Window Or For A Facade Window") was filed by ROTO FRANK AG on Feb 4, 2006. The application was issued on Jan 16, 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 |
|---|---|---|
| VKR HOLDING | Sep 23, 2016 | NORDIC PATENT SERVICE |
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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