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:
Dec. 20, 1977
Filed:
Jun. 28, 1976
Applicant:
Inventors:
John B Gilmour, Whittier, CA (US);
Praful K Mehta, Lomita, CA (US);
Melvin J Mirliss, Long Beach, CA (US);
Richard B Nielsen, Los Angeles, CA (US);
Assignee:
General Refractories Company, Bala Cynwyd, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01J / ;
U.S. Cl.
CPC ...
2524 / ; 106D / ; 264117 ;
Abstract
Expanded lightly milled perlite fines are mixed with aqueous alkali metal silicates and the wet mixture is dried at temperatures of from 600.degree. F up to 1400.degree. F in a moving air stream to form agglomerates which are useful as filteraids. The agglomerates may be heat treated in an indirect fired rotary kiln to further reduce the water solubility, and may be separated into size factions either before or after the heat treatment.