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:
Dec. 11, 1979
Filed:
Aug. 10, 1978
Applicant:
Inventor:
Jack L Parsons, East Aurora, NY (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07F / ;
U.S. Cl.
CPC ...
2605025 ; 560171 ; 2605 / ;
Abstract
Improved methods for preparation of the tetrasodium and disodium salts ofN-(phosphonoacetyl)-L-aspartic acid (PALA) are disclosed. The present methods are well suited for preparation of these products in large amounts. Particular aspects of these methods include: (1) the initial preparation of phosphonoacetyl chloride which is employed in producing the desired products; and (2) the use of anhydrous conditions for preparation and isolation of the cyclohexylammonium salt of dibenzyl PALA.