US Patent Issued to SHANGHAI HAIYAN PHARMACEUTICAL TECHNOLOGY, YANGTZE RIVER PHARMACEUTICAL GROUP on Oct. 27 for "Oxaspiro substituted pyrrolopyrazole derivative, intermediate thereof, and preparation method therefor" (Chinese Inventors)

ALEXANDRIA, Va., Oct. 27 -- United States Patent no. 12,774,282, issued on Oct. 27, was assigned to SHANGHAI HAIYAN PHARMACEUTICAL TECHNOLOGY Co. LTD. (Shanghai) and YANGTZE RIVER PHARMACEUTICAL GROUP Co. LTD (Taizhou, China).

"Oxaspiro substituted pyrrolopyrazole derivative, intermediate thereof, and preparation method therefor" was invented by Zhenya Zeng (Shanghai), Chao Kan (Shanghai), Qingfu Gao (Shanghai), Yixiao Feng (Shanghai), Bo Wu (Shanghai), Xingsong Zhang (Shanghai), Youhong Ma (Shanghai) and Kejun Sun (Shanghai).

According to the abstract* released by the U.S. Patent & Trademark Office: "An oxaspiro substituted pyrrolopyrazole derivative, an intermediate thereof, and a preparation method therefor."

The patent was filed on D...