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:
Mar. 21, 2000
Filed:
Oct. 15, 1998
Applicant:
Inventors:
Todd J Johnson, O'Fallon, MO (US);
William H Miller, Glendale, MO (US);
Assignee:
Monsanto Company, St. Louis, MO (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07F / ;
U.S. Cl.
CPC ...
562-1 ; 562 11 ;
Abstract
The invention provides a process for preparing aminophosphonic acids comprising contacting an aminophosphonate ester with a base in the presence of a hydrolysis facilitator selected from the group consisting of CO.sub.2, CS.sub.2 and COS. In one embodiment, the aminophosphonate ester is first prepared by contacting an amine, trialkylphosphite, base and formaldehyde.