Lens pattern blank

Details Lens pattern blank Lens pattern blank

1985-11-14

1987-04-14

Little, Willis

Geometrical instruments

Gauge

Lens

33200, A61B 310

Patent

active

046567542

ABSTRACT:
A lens pattern blank has a pattern of concentric circles on one face with the centers of the circle coincident with the center of the mounting hole in the mounting hub thereof and diameter indicators for each circle disposed on the face and within each circle. The blank also includes a protractor pattern on one face having the center point thereof coincident with the center of the central mounting hole and angle indicators on the face for the protractor pattern angles.

REFERENCES:
patent: 1520445 (1924-12-01), Rushmer
patent: 1648500 (1927-11-01), Newell et al.
patent: 1790572 (1931-01-01), Bugbee
patent: 2413198 (1946-12-01), Stewart
patent: 3313031 (1967-04-01), Lowe
patent: 4244639 (1981-01-01), Kanda
patent: 4299032 (1981-11-01), Young

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