Patent No. EP3327399 (titled "Method For Operating A Heat Exchange System With A Bypass Duct And Heat Exchange System With A Bypass Duct") was filed by Siemens on Oct 5, 2017. The application was issued on Feb 15, 2023.

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 |
|---|---|---|
| RWE POWER | Dec 4, 2020 | KEENWAY PATENTANWALTE NEUMANN HEINE TARUTTIS |
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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