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US 4,070,193 AGranted
Corrosion resistant metal sealing formulation
AssigneeKaddis Mfg. Co.
InventorJames Mackey Tucker
Life of this patent
Estimating the term…
Abstract
A bright finish on a copper or copper alloy metal piece is sealed by dipping the piece in an aqueous solution of sodium bichromate, chromic acid and sulfuric acid followed by rinsing in cold and then hot water. The sealed piece is quite resistant to corrosion.
Claims1
Aqueous solution for sealing a bright metal finish on copper and copper alloy metal articles consisting essentially of a mixture of about 1 to 3 pounds of sodium bichromate, about 1/4 to 1 ounce of chromic acid, about 1 to 25 milliliters of sulfuric acid for each 2 gallons of water.
Dependencies are inferred from the claim text.