Lens pattern blank
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United States of America Patent
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-
Apr 14, 1987
Grant Date -
N/A
app pub date -
Nov 14, 1985
filing date -
Nov 14, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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