US Patent Issued to Cell Exosome Therapeutics on June 30 for "Cell preservation method" (Japanese Inventors)

ALEXANDRIA, Va., July 16 -- United States Patent no. 12,667,099, issued on June 30, was assigned to Cell Exosome Therapeutics Inc. (Tokyo).

"Cell preservation method" was invented by Yasutomo Yanagita (Tokyo), Chugo Rinoie (Tokyo), Takefumi Ishidao (Tokyo) and Itsunari Minami (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "The purpose of the present invention is to obtain a cell suspension with a low concentration of cryoprotectant. This method of preserving cells used comprises the steps of (a) enriching cells from a cell suspension containing the cells and a cryoprotective solution to generate an enriched fraction, and (b) freezing the enriched fraction to prepare a frozen material. It is also possib...