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. 28, 1992
Filed:
Nov. 17, 1989
Applicant:
Inventors:
Ronald J Harkrader, Louisville, CO (US);
Richard R Jones, Fort Collins, CO (US);
Assignee:
Atrix Laboratories, Inc., Fort Collins, CO (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A61K / ; A01N / ;
U.S. Cl.
CPC ...
4241951 ; 514279 ;
Abstract
A method for separating and purifying individual benzophenanthridine alkaloids from alkaloid extracts by using the pH differences in formation of their respective alkanolamine or base forms and iminium ions. The insoluble base form of the alkaloid is collected as a precipitate and dissolved in an organic solvent and converted to the insoluble iminium ion form with a mineral or organic acid.