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US 4,229,911 AGranted
Precision blocking of semi-finished lens blanks
OwnerBela J. Bicskeiinventor
Life of this patent
Estimating the term…
Abstract
Method and apparatus for the precision blocking of semi-finished lens blanks by the adjustment of each such blank until it occupies a prescribed position where an alloy hub or "block" is removably affixed to the blank so that it can be properly gripped for finishing.
Claims6
The method of blocking a lens blank with a prescribed optical condition comprising the steps of:
- (a) manually positioning a lens blank in an instrument until the prescribed optical condition has been satisfied;
- and
- (b) affixing a block to said lens blank without moving it from its adjustment position using a plunger mechanism to bring a releasable block bearing a double-faced adhesive strip into contact with the lens blank to adhesively secure the block to the blank.
Dependencies are inferred from the claim text.