Patent No. EP3303967 (titled "Heat Exchange System With At Least Two Heat Exchange Chambers And Method For Exchanging Heat By Using The Heat Exchange System") was filed by Siemens on Sep 30, 2016. The application was issued on Oct 19, 2022.

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 |
|---|---|---|
| VON WESTERNHAGEN | Mar 19, 2020 | ROCHE |
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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