Patent No. EP3880335 (titled "A Method For Preparing A Composite Filter Medium And The Composite Filter Medium Obtained With This Method") was filed by Saati on Oct 21, 2020. The application was issued on Mar 29, 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 |
|---|---|---|
| SEFAR | Dec 28, 2023 | WUNDERLICH & HEIM PATENTANWALTE PARTG MBB |
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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