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. 17, 2009
Filed:
Mar. 06, 2006
Francois Batllo, Burr Ridge, IL (US);
David S. Viers, Aurora, IL (US);
Jeffrey S. Mosher, Lakewood, OH (US);
Francois Batllo, Burr Ridge, IL (US);
David S. Viers, Aurora, IL (US);
Jeffrey S. Mosher, Lakewood, OH (US);
Nalco Company, Naperville, IL (US);
Abstract
A method of improving the removal of an investment casting shell surrounding a metallic article. The shell is made from the deposit of layers refractory slurry and stucco onto a pattern. The shell contains, after firing, an amount of an alkali metal oxide or an alkaline earth metal oxide sufficient to reduce the strength of the shell. By this invention, after firing of the shell and pouring of the molten metallic part into the shell, the shell is hydrated to further reduce the strength of the shell, to facilitate its removal from the metallic part.