Patent No. EP4461308 (titled "Toxicity Management For Anti-Tumor Activity Of Cars") was filed by The Childrens Hospital OF Philadelphia on Jul 12, 2013. The application was issued on Apr 16, 2025.

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 |
|---|---|---|
| PATENT BOUTIQUE | Jan 16, 2026 | PATENT BOUTIQUE |
| BOULT WADE TENNANT | Jan 13, 2026 | BOULT WADE TENNANT |
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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