Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Utilizing plasma – electric – electromagnetic – particulate – or...
Patent
1978-06-12
1980-06-17
Lowe, James B.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Utilizing plasma, electric, electromagnetic, particulate, or...
264313, 351160R, 351160H, B29D 1100
Patent
active
042083648
ABSTRACT:
There is provided a mold comprising a male and a female mold member fabricated from thermoplastic polymeric materials which, in very thin sections are flexible under polymerization conditions, but, under said conditions are sufficiently inflexible in thick sections to retain their shape and surface characteristics. Said mold is provided, on either the male or the female member with a thin rim which, during the polymerization process, flexes and permits the mold members to approach each other and compensate for the shrinkage that occurs during polymerization. Said thin rim further forms the edge of the finished lens.
REFERENCES:
patent: 3056166 (1962-10-01), Weinberg
patent: 3212097 (1965-10-01), Adler
patent: 3337659 (1967-08-01), Grandperret
patent: 3422168 (1969-01-01), Bowser
patent: 3660545 (1972-05-01), Wichterle
patent: 3691263 (1972-09-01), Stoy et al.
patent: 3761208 (1973-09-01), Boudet et al.
patent: 3835588 (1974-09-01), Whitham
patent: 3871803 (1975-03-01), Beattie
patent: 3881683 (1975-05-01), Whitney
patent: 3915609 (1975-10-01), Robinson
patent: 4103992 (1978-08-01), Breger et al.
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