Step tablet

Details Step tablet Step tablet

1977-11-21

1980-01-15

Herbert, Jr., Thomas J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

96 27R, 96 28, 96 67, 428913, B32B 702, G03C 504

Patent

active

041839900

ABSTRACT:
A step tablet in which density steps of a definite shape, each density step having a specific optical density, form a series of decreasing or increasing densities, in which any two density steps contiguous to each other are disposed with a boundary space of a specific shape between the density steps.

REFERENCES:
patent: 3162533 (1964-12-01), Pelsmaker et al.
patent: 3353955 (1967-11-01), Colgrove
patent: 3690881 (1972-09-01), King
patent: 3770438 (1973-11-01), Celeste

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