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. 12, 1979
Filed:
Apr. 14, 1978
Applicant:
Inventor:
Jack A Tiethof, South Plainfield, NJ (US);
Assignee:
Engelhard Minerals & Chemicals Corporation, Edison, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01B / ;
U.S. Cl.
CPC ...
252188 ; 423265 ; 423515 ;
Abstract
Aluminum metal is activated with hydrochloric acid and then reacted with an aqueous solution of sulfur dioxide to produce an aluminum hydrosulfite (dithionite) liquor useful for bleaching materials such as clay. The aluminum hydrosulfite can be converted to a sodium hydrosulfite liquor by precipitating aluminum with a sodium base.