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:
Jun. 22, 1976
Filed:
Jan. 20, 1975
Karl E Wiegand, Baton Rouge, LA (US);
Ethyl Corporation, Richmond, VA (US);
Abstract
It is disclosed that citric acid or its salts are obtained by the hydrolysis of a 3-carbamoyl-3-hydroxy-4-cyanobutyric acid or salt, that a 3-carbamoyl-3-hydroxy-4-cyanobutyric acid or salt is obtained from a 3-carbamoyl-3,4-epoxybutyric acid or salt, that a 3-carbamoyl-3,4-epoxybutyric acid or salt is obtained from a 3-carbamoyl-3-hydroxy-4-halobutyric acid or salt, that a 3-carbamoyl-3-hydroxy-4-halobutyric acid is obtained from a 3-cyano-3-hydroxy-4-halobutyric acid or salt, that a 3-cyano-3-hydroxy-4-halobutyric acid or salt is obtained from a 3-oxo-4-halobutyric acid or salt, that a 3-oxo-4-halobutyric acid or salt is obtained from a 3-oxo-4-halobutyryl halide, and that a 3-oxo-4-halobutyryl halide is obtained from diketene. Preferred halide compounds are compounds of chlorine.