Patent No. EP1391413 (titled "Traction Elevator System Using A Flexible, Flat Rope And A Permanent Magnet Machine") was filed by Otis Elevator on Feb 19, 1999. The application was issued on Mar 9, 2022.

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 24, 2015 | DEHNS GERMANY PARTNERSCHAFT MBB |
| KONE | Sep 22, 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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