Patent No. EP4227172 (titled "Trailer Control Module And Trailer Control Valve Arrangement") was filed by ZF CV Systems Europe on Feb 15, 2022. The application was issued on Dec 24, 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.
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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