Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Physical dimension specified
Patent
1980-06-09
1981-08-18
Bell, Mark
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Physical dimension specified
65 30R, 65 32, 106 53, 106 54, 106DIG6, 428913, 428410, 106 47Q, C03C 326, C03C 308, C03C 330
Patent
active
042846862
ABSTRACT:
This invention is concerned with producing glasses suitable for use as spectacle lenses for aphakics or for persons subject to photoretinitis or retinitis pigmentosa. The glasses exhibit near-zero transmittance of radiations having wavelengths shorter than a selected cutoff wavelength ranging about 440-550 nm and the transmittance of the remainder of the visible spectrum is adjusted through the glass demonstrating photochromic behavior. The inventive method contemplates exposing photochromic glass within a narrowly-defined composition range to a strongly-reducing atmosphere at temperatures between about 350.degree.-520.degree. C. for a period of time of at least 12 hours to develop an integral colored surface layer on the glass.
REFERENCES:
patent: 3892582 (1975-07-01), Simms
patent: 3920463 (1975-11-01), Simms
patent: 4018965 (1977-04-01), Kerko et al.
patent: 4118214 (1978-10-01), Wedding
patent: 4125405 (1978-11-01), Aravjo et al.
patent: 4190451 (1980-02-01), Hares et al.
Bell Mark
Corning Glass Works
Janes Jr. Clinton S.
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