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:
May. 23, 1978
Filed:
Feb. 11, 1977
Applicant:
Inventors:
Alfred Hirschvogel, Langweid, DT;
Friedrich Wagner, Gersthofen, DT;
Assignee:
Sigri Elektrographit GmbH, Meitingen near Augsburg, DT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01B / ; C01B / ;
U.S. Cl.
CPC ...
4234 / ; 423448 ; 423460 ;
Abstract
Production of graphite-hydrogensulfate by dispersing crystalline graphite particles in sulfuric acid, agitating the mixture, adding hydrogen peroxide to the agitated dispersion and continuing agitation until the graphite is converted to graphite-hydrogensulfate. Excess acid is separated and the residual acid in the solid product is removed by washing. The graphite-hydrogensulfate may be heated to transform it into expanded graphite. The method minimizes pollution of the atmosphere with noxious gases and also makes possible ready recovery of unused acid.