Patent No. EP3594498 (titled "Gas Recirculation Device And System With Same") was filed by Pfeiffer Vacuum on Nov 6, 2019. The application was issued on Jan 5, 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 |
|---|---|---|
| CONCEPT LASER | Oct 5, 2022 | HAFNER & KOHL PARTMBB |
| GEBR BECKER | Oct 5, 2022 | MULLER |
| NIKON SLM SOLUTIONS | Oct 5, 2022 | SCHICKER |
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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