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:
Mar. 29, 1994
Filed:
Feb. 12, 1992
Applicant:
Inventors:
Kurt F O'Connor, Carmel, IN (US);
James R Stewart, Danville, IN (US);
Assignee:
General Motors Corporation, Detroit, MI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B29C / ; B29C / ;
U.S. Cl.
CPC ...
264 25 ; 264113 ; 264125 ; 264221 ; 264317 ; 264 60 ;
Abstract
A method of making a fused polycarbonate pattern for casting alloy structures, particularly gas-turbine blades, or components. A plurality of powder layers are fused together by a laser beam in a layer-by-layer fashion to produce the pattern. A pattern/casting mold is made and the pattern is burned out in a flash flame oven at a temperature ranging from about 1600.degree. F. to about 2100.degree. F. Preferably the burn-out step is conducted in the presence of an air stream so that the polycarbonate pattern is burned out ash free.