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:
Sep. 24, 1991
Filed:
Dec. 07, 1989
George D Fulford, Kingston, CA;
Anwer M Khan, Kingston, CA;
Alcan International Limited, Montreal, CA;
Abstract
This invention provides an improved process for increasing the specific gravity of red mud. The process comprises mixing red mud in an acidic solution, such as sulfur dioxide solution, having a pH of between about 1.5 and about 3.0 to form an insoluble red mud residue. The specific gravity of the red mud residue can also be increased by heating the residue in air to a temperature of 250.degree. C. to about 300.degree. C. This process enables recovery of a treated red mud derivative having an increased specific gravity in excess of 4.0, which makes the product particularly useful as a weighting agent for drilling fluid, and as the solid phase of slurries used to fill crevices and fissures exposed by drilling or excavation.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile