Process for making a die punch

Details Process for making a die punch Process for making a die punch

1976-03-04

1977-10-11

Jones, Jr., James L.

Metal tools and implements, making

Blank or process

Die

B21K 520

Patent

active

040529169

ABSTRACT:
A concave die punch of the type required in the formation of silicone elastomer contact lenses in which the curvature of the marginal zone is greater than the curvature of the central zone is made by making a convex die negative from glass or a vitreous ceramic; providing the negative with a thin metal coating, and then forcing a concave die positive made of a heat hardenable plastic in an enclosed space against the metal coated surface of the die negative while heating the said resin to harden it, thereby causing the metal coating to adhere to the positive and thus transferring the metal coating to the die positive whereby a reproduction of the surface of the die negative on the die positive is obtained.

REFERENCES:
patent: 3343430 (1967-09-01), Haas et al.
patent: 3526949 (1970-09-01), Genovese
patent: 3727489 (1973-04-01), Inoue

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