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. 06, 1988
Filed:
Dec. 12, 1986
Applicant:
Inventor:
David K Douden, St. Paul, MN (US);
Assignee:
Minnesota Mining and Manufacturing Company, Saint Paul, MN (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B29B / ;
U.S. Cl.
CPC ...
264 15 ; 264 43 ;
Abstract
Process for making hollow, ceramic macrospheres by making a paste of a continuous phase material (e.g., sodium silicate or potassium silicate) and an insolubilizing agent (e.g., kaolin clay). Pellets are formed from the paste and expanded by subjection to heat to form hollow spheroids. The spheroids are fired at a temperature (typically 600.degree.-1000.degree. C.) and for a time sufficient to insolubilize the continuous phase material. The process may further include coating the fired spheroids with an epoxy resin (to reduce porosity) and/or bonding a plurality of the fired spheroids together to form a rigid mass of bonded spheroids.