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:
May. 12, 1981
Filed:
Jun. 20, 1979
Applicant:
Inventors:
John W Sparks, Boston, MA (US);
Henry Bader, Newton Center, MA (US);
Assignee:
Polaroid Corporation, Cambridge, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
544262 ; 548377 ;
Abstract
There is described a process for synthesizing 4-aminopyrazolo(3,4-d)pyrimidine wherein 3-amino-4-cyanopyrazole is reacted with formamidine or a salt of formamidine at a temperature in the range of from about 85.degree. C. to about 125.degree. C.