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:
Oct. 05, 1976
Filed:
Jan. 17, 1975
Applicant:
Inventor:
Nicholas P Greco, Edgewood, PA (US);
Assignee:
Koppers Company, Inc., Pittsburgh, PA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ;
U.S. Cl.
CPC ...
2605 / ; 423520 ; 423545 ;
Abstract
Alpha-resorcylic acid is produced by the hydrolysis of 3,5-diamino benzoic acid in an aqueous solution of ammonium bisulfate. The reactants are contacted at an elevated temperature for a period of time sufficient to hydrolyze the 3,5-diamino benzoic acid to alpha-resorcylic acid and the alpha-resorcylic acid so produced is separated from the reaction mixture. The ammonium sulfate is regenerated to ammonium bisulfate by removing the water and thermally decomposing the by-product ammonium sulfate at an elevated temperature.