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US 4,439,491 AGranted
Oxidation retardant for graphite
AssigneeGreat Lakes Carbon Corporation
InventorWilliam F. Wilson
Life of this patent
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Abstract
Carbon or graphite is protected against oxidation by application of a solution comprising monoammonium phosphate, zinc orthophosphate, phosphoric acid, boric acid, cupric oxide, wetting agent in water.
Claims4
An oxidation retardant solution for carbon and graphite comprising a solution of monobasic ammonium phosphate, zinc orthophosphate, phosphoric acid, boric acid and cupric oxide.
An oxidation retardant solution for elemental carbon comprising by weight, monoammonium phosphate, 19.8%;
- zinc orthophosphate, 3.5%;
- phosphoric acid, 15.3%;
- boric acid, 0.9%;
- cupric oxide 0.3%;
- wetting agent 1%;
- and water 59.2%.
3 more elements
Dependencies are inferred from the claim text.