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:
May. 25, 1982
Filed:
Jul. 02, 1979
Gerald S Cole, Southfield, MI (US);
Ford Motor Company, Dearborn, MI (US);
Abstract
A rapid method for dehydrating a water-sand mixture containing sodium or potassium silicate to produce a strongly bonded sand core is disclosed. The silicate is mixed in a water/silicate ratio of 1.45-3.22:1 and is limited to 0.25-3% of the weight of the mixture. The core box is semi-foraminous and partially transparent to micro-wave energy whereby generated vapor is reduced due to the heated inner surface of the core box (some degree of lossiness) and due to some escape through limited core-box openings. The controlled supersaturated environment about the core serves to prevent micro-porosity and surface defects when controlled micro-wave energy is used to heat cure the mixture. To promote resistance to humidity after curing, the mixture may contain 0.5% zinc oxide, chromic oxide, or aminoaldehyde.