Lens mold

Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Including shaping means comprising fluid pressure contacting...

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Details

425405R, 425808, 425389, 249112, B29C 1704, B29D 1100, B29C 102

Patent

active

040380149

ABSTRACT:
A mold for forming lens blanks to meniscus shapes under applied heat and a force created by partial vacuum. A cupped lens shaping surface in the mold is cushioned and covered with a synthetic fabric for effecting exceptional accuracy in lens blank conformance to shaping surface curvature, optimum surface smoothness and quick release upon completion of a forming cycle.

REFERENCES:
patent: 2441097 (1948-05-01), Hicks
patent: 3004295 (1961-10-01), Bottoms et al.
patent: 3061881 (1962-11-01), Sherno
patent: 3072961 (1963-01-01), Gilbert
patent: 3290418 (1966-12-01), Best
patent: 3315313 (1967-04-01), Steigman
patent: 3353219 (1967-11-01), Snyder
patent: 3422495 (1969-01-01), Jones
patent: 3897530 (1975-07-01), Leathers

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