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:
Feb. 05, 1991
Filed:
Aug. 30, 1989
Applicant:
Inventor:
Hilton A Roth, Cheshire, CT (US);
Assignee:
United Technologies Corporation, Hartford, CT (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B22C / ;
U.S. Cl.
CPC ...
164361 ; 164-6 ; 164469 ; 501 95 ; 106 389 ;
Abstract
A ceramic core molding composition, which includes alumina fibers, zircon, and fumed silica in an amorphous silica base, reduces shrinkage and shrinkage stresses during the core production process. Cores produced utilizing the disclosed composition and method exhibit an improved resistancce to macrocracking over conventionally produced cores.