Patent No. EP3378952 (titled "Methods And Systems For Detecting Genetic Variants") was filed by Guardant Health on Dec 24, 2014. The application was issued on Feb 5, 2020.

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 |
|---|---|---|
| GRUNECKER PATENT UND RECHTSANWALTE PARTG MBB | Nov 5, 2020 | GRUNECKER |
| GRUNECKER PATENT UND RECHTSANWALTE PARTG MBB | Nov 5, 2020 | GRUNECKER PATENT |
| FOUNDATION MEDICINE | Nov 5, 2020 | POHLMAN |
| BUHLER | Nov 4, 2020 | MAIWALD |
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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