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US 4,017,321 AGranted
Void free electrical cement-concrete
AssigneeI-T-E Imperial Corporation
InventorDavid H. Reighter
Life of this patent
Estimating the term…
Abstract
Electrical insulation grade concrete is prepared by mixing the aggregate and cement with an excess of water and thereafter vacuum deaerating and vacuum dehydrating the resulting mixture.
Claims9
A method of producing electrical insulation grade concrete which comprises mixing aggregate, cement and an amount of an aqueous liquid in excess of the amount necessary to cause hardening of the concrete and sufficient to substantially reduce the viscosity of the mixture, applying a vacuum to the resulting mixture sufficient to remove entrained air therefrom, and thereafter removing the excess amount of aqueous liquid under vacuum.
Dependencies are inferred from the claim text.