Color contrast gauge

Details Color contrast gauge Color contrast gauge

1975-06-23

1976-12-21

Corbin, John K.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

35 283, 356191, 356194, G01J 348

Patent

active

039985563

ABSTRACT:
A color contrast gauge to determine and test the proper contrast of a light background to a darker machine-readable symbol printed thereon.

REFERENCES:
patent: 2027816 (1936-01-01), Drucker
patent: 3436157 (1969-04-01), Adler et al.

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