Method and apparatus for making lenses
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United States of America Patent
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May 20, 1997
Issued Date -
N/A
app pub date -
Nov 22, 1994
filing date -
Aug 19, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for forming a preform mass of thermoplastic material into a lens by compression molding between a pair of molds without the formation of air bubbles or the entrapment of air pockets in the finished lens by preheating the preform mass and molds, and further continuing to apply increased pressure while increasing the temperature or maintaining a predetermined temperature and pressure until the mass has been compressed between the two molds into the shape of a substantially finished lens.
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