Patent No. EP3933981 (titled "Positive Electrode Active Material, Preparation Method Therefor, Positive Electrode Plate, Lithium Ion Secondary Battery, And Battery Module, Battery Pack And Device Comprising Lithium Ion Secondary Battery") was filed by Contemporary Amperex Technology on Aug 18, 2020. The application was issued on Jul 10, 2024.

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 |
|---|---|---|
| MITSCHERLICH | Apr 9, 2025 | STRYCH |
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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