Patent No. EP3101716 (titled "Positive Electrode Active Material For Lithium Secondary Batteries, Positive Electrode For Lithium Secondary Batteries, And Lithium Secondary Battery") was filed by Sumitomo Chemical on Jan 26, 2015. The application was issued on Jul 4, 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.
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