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. 07, 2005
Filed:
Jun. 14, 1999
Nicholas Edward Sargent, Canton, MI (US);
June-sang Siak, Troy, MI (US);
Mei Cai, Bloomfield Hills, MI (US);
Thomas C. Pederson, Rochester Hills, MI (US);
Sheila Farrokhalaee Kia, Bloomfield Hills, MI (US);
Nicholas Edward Sargent, Canton, MI (US);
June-Sang Siak, Troy, MI (US);
Mei Cai, Bloomfield Hills, MI (US);
Thomas C. Pederson, Rochester Hills, MI (US);
Sheila Farrokhalaee Kia, Bloomfield Hills, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
In the lost foam casting of aluminum, coating a fugitive pattern with a refractory coating containing a thermally stable, water-insoluble, acid-gasifiable (e.g. CaCO) compound, and contacting the casting, with the coating thereon, with an acid to dissociate and gasify the compound and rupture the coating. Preferably, any thermal degradation products from the pattern residing in the coating are neutralized to promote wetting of the coating.