Patent No. EP1676807 (titled "Elevator System With Overhead Drive Motor") was filed by Otis Elevator on Feb 19, 1999. The application was issued on Dec 17, 2014.

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 |
|---|---|---|
| THYSSENKRUPP ELEVATOR | Sep 16, 2015 | DEHNS GERMANY PARTNERSCHAFT MBB |
| KONE | Sep 11, 2015 | GLUCK KRITZENBERGER PATENTANWALTE PARTGMBB |
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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