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:
Nov. 05, 1991
Filed:
May. 10, 1991
Applicant:
Inventors:
John G Kubisch, Midland, MI (US);
James B Mercer, Saginaw, MI (US);
Wilmer G Schaeff, Saginaw, MI (US);
Thomas E Wenzel, Saginaw, MI (US);
Assignee:
General Motors Corporation, Detroit, MI (US);
Primary Examiner:
Int. Cl.
CPC ...
B22D / ;
U.S. Cl.
CPC ...
164-71 ; 164 63 ; 1641601 ; 164255 ;
Abstract
In vacuum countergravity casting a melt into a mold sealingly engaged to a vacuum container by an elastomeric sealing gasket, the sealing gasket is isolated from the heat of an underlying source of the melt and from contact therewith during casting by substantially binderless refractory particulates, such as loose foundry sand, held in a particulate-receiving space in the container about a lower, melt-engaging portion of the mold by a negative differential pressure established between the inside and outside of the particulate-receiving space.