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. 01, 1993
Filed:
Mar. 25, 1992
Robert L Zeller, III, Youngstown, NY (US);
Karl W Seper, Youngstown, NY (US);
Russell J Morgan, Grand Island, NY (US);
Occidental Chemical Corporation, Niagara Falls, NY (US);
Abstract
Disclosed is a method of making hydrated chromic oxide of low sodium content by forming an aqueous solution of sodium bichromate, reducing the sodium bichromate to chromic oxide using sucrose or formaldehyde, which results in the precipitation of chromic oxide, filtering the hydrated chromic oxide, acid repulping and filtering or calcining the hydrated chromic oxide, followed by water repulp and filtering with displacement washing. The color of the particle can be controlled by the drying temperature. A composite particle of hydrated chromic oxide/carbon can be made by forming a slurry of the aqueous solution of sodium bichromate with powdered carbon. The composite particle can be heated to directly produce chrome metal.