Patent No. EP3183738 (titled "Switching Arrangement Comprising Two On-Load Tap Changers, Electric System Comprising A Switching Arrangement Of Said Type, And Use Thereof") was filed by Maschinenfabrik Reinhausen on Apr 24, 2015. The application was issued on Aug 20, 2025.

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 |
|---|---|---|
| HITACHI ENERGY | May 20, 2026 | EPPING HERMANN FISCHER |
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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