Patent No. EP2156751 (titled "Novel Sweetener Having Sugar-Like Taste And Production Method And Use Of The Same") was filed by Hayashibara on May 19, 2008. The application was issued on Nov 14, 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.
| Company | Opposition Date | Representative |
|---|---|---|
| HANNA MOORE & CURLEY | Jul 1, 2019 | HANNA MOORE CURLEY |
| MURGITROYD | Jul 1, 2019 | MURGITROYD |
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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