Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Utilizing plasma – electric – electromagnetic – particulate – or...
Patent
1981-02-27
1983-06-28
Lowe, James B.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Utilizing plasma, electric, electromagnetic, particulate, or...
264 25, 264337, 425808, B29D 1100
Patent
active
043904823
ABSTRACT:
The invention relates to a fabrication method for molding a contact lens with the required optical qualities.
This method consists in designing a mold (1, 2) of high thermal inertia, which is transparent to, or little absorbing the electromagnetic microwave frequencies between 10.sup.6 Hz and 10.sup.11 Hz, in developing a base composition from polymerizing double-bond monomers which are absorbing with respect to the above microwaves, and in ensuring the polymerization of the composition within the closed mold by irradiation with the above cited electromagnetic waves at a power density suited to keep the temperature at the mold level approximately below 40.degree. C.
REFERENCES:
patent: 3171869 (1965-03-01), Weinberg
patent: 4073577 (1978-02-01), Hofer
patent: 4121896 (1978-10-01), Shepherd
patent: 4138086 (1979-02-01), Mizutani
patent: 4159292 (1979-06-01), Neefe
patent: 4166088 (1979-08-01), Neefe
patent: 4179484 (1979-12-01), Neefe
patent: 4209289 (1980-06-01), Newcomb
Alcon Pharmaceuticals Limited
Lowe James B.
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