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. 13, 1999
Filed:
Dec. 10, 1997
Applicant:
Inventors:
Vidyanatha A Prasad, Leawood, KS (US);
Klaus Jelich, Overland Park, KS (US);
Donald K Smith, Liberty, MO (US);
Assignee:
Bayer Corporation, Pittsburgh, PA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C07F / ;
U.S. Cl.
CPC ...
558 88 ; 558199 ;
Abstract
The present invention provides a method for making O,S-dimethyl phosphoramidothioate. In accordance with the present process, O,O-dimethyl phosphoramidothioate is isomerized in the presence of a catalyst at a temperature of from about 35.degree. C. to about 45.degree. C. to form a mixture containing O,S-dimethyl phosphoramidothioate and the resultant mixture is lagered at a temperature of from about 35.degree. C. to about 45.degree. C. for about 3 to 6 hours. The total time for both steps is at least about 4 hours.