Punch duplicating process

Details Punch duplicating process Punch duplicating process

1975-06-03

1979-04-24

Lanham, C. W.

Metal working

Method of mechanical manufacture

Combined manufacture including applying or shaping of fluent...

294695, 264156, 264 1, 264220, 353 27R, 352244, 352 67, 350319, 350DIG1, 350 369, B22D 11126

Patent

active

041504780

ABSTRACT:
A method of making copies of information sets of the type carried by microfiche elements having integral lenses on one surface thereof. The copy is made by embossing the top surface of a plastic, planar blank to form the integral lenses. The bottom surface of the blank is provided with a thin, opaque coating. The coating is ruptured by a stamping block, the ruptured portions forming optical apertures in the coating. These apertures function in a manner analogous to developed images in a photographic emulsion. Thus, microfiche copies may be made without the use of silver bromide. The selective rupture process may also be employed in the duplication of motion picture film.

REFERENCES:
patent: 3619024 (1977-11-01), Frattarola
patent: 3662041 (1972-05-01), Hartman
patent: 3824609 (1974-07-01), Tevick
patent: 3839514 (1974-10-01), Nauta
patent: 3864034 (1975-02-01), Yevick
patent: 3865485 (1975-02-01), Yevick
patent: 3882207 (1975-05-01), Hannan et al.

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