Patent No. EP3897726 (titled "Dietary Butyrate") was filed by Nestle on Dec 16, 2019. The application was issued on Jan 4, 2023.

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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