Patent No. EP3904815 (titled "Process For Enhanced Closed-Circuit Cooling System") was filed by AIR Products And Chemicals on Apr 26, 2021. The application was issued on Jan 25, 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 |
|---|---|---|
| LAIR LIQUIDE | Oct 25, 2023 | AIR LIQUIDE |
| LINDE | Oct 25, 2023 | GRUNDNER |
| LINDE | Oct 25, 2023 | IMHOF |
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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