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. 24, 1997
Filed:
Jun. 07, 1995
Kurt Francis O'Connor, Carmel, IN (US);
James Paul Hoff, Greenfield, IN (US);
Donald James Frasier, Greenwood, IN (US);
Ralph Edmund Peeler, Reelsville, IN (US);
Heidi Mueller-Largent, Indianapolis, IN (US);
Floyd Freeman Trees, Bloomington, IN (US);
James Rodney Whetstone, Indianapolis, IN (US);
John Henry Lane, Indianapolis, IN (US);
Ralph Edward Jeffries, Indianapolis, IN (US);
Allison Engine Company, Indianapolis, IN (US);
Abstract
The present invention relates to a method and apparatus for producing a cast structure. In one embodiment of the present invention an alloy casting mold has molten alloy injected therein to facilitate completely filling a part cavity within the mold. Further, an alloy charge pressure control device is utilized to reduce the charge pressure of the molten alloy during its injection into the mold cavity to minimize distortion and creep of the ceramic shell. In one form of the present invention the charge pressure control device removes excess alloy so as to reduce the head pressure of the molten alloy thereby eliminating the undesirable creep of the ceramic shell.