Method for manufacture of non-allergy creating precious metal ob

Details Method for manufacture of non-allergy creating precious metal ob Method for manufacture of non-allergy creating precious metal ob

1989-08-21

1990-06-12

Andrews, Melvyn J.

Metal treatment

Compositions

Heat treating

291606, C22F 114

Patent

active

049330233

ABSTRACT:
A method for manufacturing a non-allergenic metal object which can be safely worn next to the skin, comprising the steps of: providing an optimum pure starting material selected from a class comprising an optimum pure nobel metal and an optimum pure noble-metal alloy; creating a protective atmosphere at atmospheric pressure and consisting of water-free hydrocarbons incompletely combusted with pure oxygen and free of oxygen, hydrogen, nitrogen and nitrogen oxides; melting the starting material in the protective atmosphere; molding a molded object from the starting material in the protective atmosphere; solidifying and cooling the molded object in the protective atmosphere; the step of annealing the solidified molded object prior to cooling and including the further steps of heating the protective atmosphere and causing it to flow in one direction, moving the solidified molded object through the heated flowing protective atmosphere in the opposite direction, maintaining a portion of the heating flowing protective atmosphere sufficiently hot to effect annealing of the solidified molded object, and maintaining another portion of the heated flowing protective atmosphere sufficiently cool to allow cooling of the annealed molded object.

REFERENCES:
patent: 3613209 (1971-10-01), Piquerez
patent: 4684416 (1987-08-01), Masumoto et al.

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