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. 22, 1976
Filed:
Jun. 16, 1975
Applicant:
Inventors:
N Tryggve Baak, Marina Del Rey, CA (US);
Dwight L Harris, Westlake Village, CA (US);
Assignee:
Cyprus Mines Corporation, West Los Angeles, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01B / ;
U.S. Cl.
CPC ...
423155 ; 106306 ; 423331 ;
Abstract
A process for removing tremolite impurity from talc by subjecting finely ground talc to a combination of steps including froth flotation and pressure leaching with a strong acid at an elevated temperature. The recovered talc is characterized by a tremolite content of less than 1.0 percent by weight.