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:
Jan. 25, 2005
Filed:
Oct. 11, 2002
June-sang Siak, Troy, MI (US);
Gordon Alwin Tooley, Saginaw, MI (US);
Mark Eugene Hoover, Mt. Morris, MI (US);
Jerry Allen Barendreght, Leonard, MI (US);
June-Sang Siak, Troy, MI (US);
Gordon Alwin Tooley, Saginaw, MI (US);
Mark Eugene Hoover, Mt. Morris, MI (US);
Jerry Allen Barendreght, Leonard, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
Apparatus for the gravity-cast, 'lost-foam' casting of metal castings, including a fugitive, pyrolizable foam pattern forming a casting cavity in a bed of loose sand, and a hollow sprue for supplying melt to the casting cavity, wherein the sprue consists essentially of the same metal as is being cast. A high-temperature, porous vent is provided adjacent the discharge end of the metal sprue to expel air from the sprue that would otherwise be trapped therein.