US Patent Issued to OSAKA GAS on July 14 for "Hydroxyalkanoic acid crystal production method and hydroxyalkanoic acid crystal polymorph" (Japanese Inventors)

ALEXANDRIA, Va., July 14 -- United States Patent no. 12,679,796, issued on July 14, was assigned to OSAKA GAS Co. LTD. (Osaka, Japan).

"Hydroxyalkanoic acid crystal production method and hydroxyalkanoic acid crystal polymorph" was invented by Masayuki Sugimoto (Osaka, Japan), Jun Tsubota (Osaka, Japan) and Sae Ishikawa (Osaka, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for producing a hydroxyalkanoic acid crystal, comprising freeze-drying a solution containing a hydroxyalkanoic acid, wherein based on the total amount of the hydroxyalkanoic acid taken as 100 mass %, (1) the R form content is 95 to 100 mass % or (2) the S form content is 95 to 100 mass %."

The patent was filed on Dec. 7, 20...