Patent No. EP2833415 (titled "Solar Cell Sealing Material And Solar Cell Module") was filed by Mitsui Chemicals on Mar 13, 2013. The application was issued on May 2, 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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