Patent No. EP2761170 (titled "Wind Turbine Blade Having A Geometric Sweep") was filed by Siemens on Jan 15, 2013. The application was issued on Mar 8, 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.
| Company | Opposition Date | Representative |
|---|---|---|
| ENERCON | Dec 8, 2017 | EISENFUHR SPEISER |
| VESTAS WIND SYSTEMS | Dec 7, 2017 | ARNOLD |
| NORDEX ENERGY | Dec 6, 2017 | HAUCK |
| NORDEX ENERGY | Dec 6, 2017 | HAUCK PATENTANWALTSPARTNERSCHAFT MBB |
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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