The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 21, 2015
Filed:
Oct. 23, 2014
Applicant:
Chengdu Baiyu Technology Pharmacy Co., Ltd, Chengdu, Sichuan, CN;
Inventors:
Yi Sun, Fushun, CN;
Yonghong Zhu, Chengdu, CN;
Zhengbing Tong, Wupao Town, CN;
Jie Wang, Nanchong, CN;
Assignee:
CHENGDU BAIYU TECHNOLOGY PHARMACY CO., LTD., Sichuan, CN;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A61K 36/16 (2006.01); C07D 493/20 (2006.01); C07D 493/22 (2006.01);
U.S. Cl.
CPC ...
A61K 36/16 (2013.01); C07D 493/20 (2013.01); C07D 493/22 (2013.01); A61K 2236/00 (2013.01); A61K 2236/30 (2013.01);
Abstract
A method for extracting and separating ginkgolides. The ginkgolides obtained through steps of extraction on a ginkgo leaf, further extraction, column chromatography, crystallization, and crystal mixing comprise 25.0% to 50.0% of bilobalide (CHO), 20.0% to 45.0% of ginkgolide A (CHO), 10.0% to 30.0% of ginkgolide B (CHO), and 5.0% to 15.0% of ginkgolide C (CHO). The total quantity of the bilobalide, the ginkgolide A, the ginkgolide B, and the ginkgolide C is over 95%.