Patent No. EP2385245 (titled "Steel Tower For A Wind Turbine") was filed by Siemens on May 5, 2010. The application was issued on Sep 13, 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 |
|---|---|---|
| GE WIND ENERGY | Jun 13, 2018 | ZIMMERMANN & PARTNER PATENTANWALTE MBB |
| VESTAS WIND SYSTEMS | Jun 13, 2018 | GRUNECKER PATENT |
| NORDEX ENERGY | Jun 11, 2018 | HAUCK |
| NORDEX ENERGY | Jun 11, 2018 | HAUCK PATENTANWALTSPARTNERSCHAFT MBB |
| ENERCON | Jun 8, 2018 | EISENFUHR SPEISER |
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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