Patent No. EP3149480 (titled "Risk-Stratification Of B-Precursor Acute Lymphoblastic Leukemia Patients") was filed by Amgen on May 20, 2015. The application was issued on Dec 26, 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 |
|---|---|---|
| SANOFI | Sep 26, 2019 | CABINET NONY |
| SANOFI | Sep 26, 2019 | IPSILON |
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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