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:
Feb. 18, 1992
Filed:
Jul. 31, 1990
Applicant:
Inventor:
Wilhelm Quittmann, Visp, CH;
Assignee:
Lonza Ltd., Gampel/Valais, CH;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07F / ; C07D / ;
U.S. Cl.
CPC ...
544229 ; 544277 ;
Abstract
Crude adenine, that is contaminated by 9-phenyladenine and/or colored additives, is converted with hexamethyldisilazane in the presence of a catalyst into N,N'-bis(trimethylsilyl) adenine, which is distilled and then reconverted into pure adenine by hydrolysis.