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:
Jul. 26, 2005
Filed:
May. 07, 2003
Mehrdad Yasrebi, Clackamas, OR (US);
Karl Milton Taft, Iii, Portland, OR (US);
David Howard Sturgis, Boring, OR (US);
Michael Gerald Sorbel, Oregon City, OR (US);
Mark E. Springgate, Portland, OR (US);
Douglas Gene Nikolas, Battleground, WA (US);
Mehrdad Yasrebi, Clackamas, OR (US);
Karl Milton Taft, III, Portland, OR (US);
David Howard Sturgis, Boring, OR (US);
Michael Gerald Sorbel, Oregon City, OR (US);
Mark E. Springgate, Portland, OR (US);
Douglas Gene Nikolas, Battleground, WA (US);
PCC Structurals, Inc., Portland, OR (US);
Abstract
Embodiments of a method for increasing the lifetime of a casting slurry are described. One feature of the disclosed embodiments comprises processing refractory materials that are used to form casting slurries to provide a substantial increase in slurry lifetime for slurries made using such processed materials compared to slurries made using materials not processed as described herein. One embodiment of the method comprises heat processing at least one refractory powder. Without limiting the invention to a theory of operation, processing is continued for a period of time sufficient to reduce the amount of hydration from a first hydration level to a second hydration level. A slurry is formed using the refractory powder at a hydration level which provides an increased slurry lifetime relative to the same material without processing according to the disclosed embodiments.