Patent No. EP3153526 (titled "Antibodies Against Human Cd39 And Use Thereof For Inhibiting T Regulatory Cells Activity") was filed by Inserm Institut National DE LA Sant ET DE LA Recherche Mdicale on Jan 30, 2009. The application was issued on Sep 23, 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 |
|---|---|---|
| BOULT WADE TENNANT | Jun 23, 2021 | BOULT WADE TENNANT |
| TRISHULA THERAPEUTICS | Jun 23, 2021 | HUTTER |
| ABBVIE | Jun 21, 2021 | MEWBURN ELLIS |
| SURFACE ONCOLOGY | Jun 21, 2021 | HOIBERG PS |
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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