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:
Jan. 16, 2001
Filed:
May. 10, 1999
Applicant:
Inventors:
Birgit Draeger, D-06114 Halle, DE;
Tino Galgon, Halle, DE;
Reinhard Neubert, Halle, DE;
Wolfgang Wohlrab, Halle, DE;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 6/129 ; A01N 6/500 ; A01N 4/500 ;
U.S. Cl.
CPC ...
C07C 6/129 ; A01N 6/500 ; A01N 4/500 ;
Abstract
A method of producing betulinic acid from the bark of plane trees by fractional extraction with a solvent of medium polarity and subsequent recrystallization out of methanol.