Patent No. EP2102495 (titled "Wind Energy Installation With Negative Sequence System Regulation And Operating Method") was filed by Repower Systems on Nov 20, 2007. The application was issued on Jan 11, 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 | Oct 11, 2017 | ZIMMERMANN & PARTNER PATENTANWALTE MBB |
| SUZLON ENERGY LTD. | Oct 11, 2017 | MAIKOWSKI & NINNEMANN PATENTANWALTE PARTNERSCHAFT MBB |
| VESTAS WIND SYSTEMS | Oct 11, 2017 | GRUNECKER PATENT |
| SCHORR | Oct 10, 2017 | COHAUSZ & FLORACK |
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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