Patent No. EP3138912 (titled "Crispr-Based Genome Modification And Regulation") was filed by Sigma Aldrich on Dec 5, 2013. The application was issued on Dec 5, 2018.

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 |
|---|---|---|
| POHLMAN | Sep 5, 2019 | POHLMAN |
| BASF | Sep 4, 2019 | EISENFUHR SPEISER |
| BAYER BAYER | Jun 18, 2019 | COHAUSZ & FLORACK |
| VOSSIUS & PARTNER PATENTANWALTE RECHTSANWALTE MBB | Feb 22, 2019 | VOSSIUS & PARTNER PATENTANWALTE RECHTSANWALTE MBB |
| GRUND | Jan 30, 2019 | GRUND |
| SCHLICH | Dec 6, 2018 | SCHLICH |
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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