Glass manufacturing – Processes – With chemically reactive treatment of glass preform
Patent
1977-04-21
1978-07-18
Bashore, S. Leon
Glass manufacturing
Processes
With chemically reactive treatment of glass preform
65 33, 65111, 65115, 65119, 65120, 65DIG2, 106 47Q, 106 52, 106 54, 106DIG6, C03C 1500, C03B 3100
Patent
active
041013026
ABSTRACT:
The invention achieves local variation, or a continuous gradation, in photochromic or phototropic properties across the face of glass lenses and lens blanks, especially those of ophthalmic quality. The lenses and lens blanks contain all those ingredients required to produce photochromic or phototropic behavior. They are exposed to a locally variable temperature field or environment, in such manner as to, in at least one portion of the lens or lens blank cause the temperature therein to exceed the strain point but not the softening point of the glass. In other portions of the lens or lens blank the temperature is below the strain point, thus causing development of phototropic or photochromic behavior only in those portions of the lens or lens blank exposed to the temperatures above the strain point.
REFERENCES:
patent: 2292684 (1942-06-01), Blau
patent: 2515940 (1950-07-01), Stookey
patent: 2752506 (1956-06-01), Fitzgerald et al.
patent: 2770922 (1956-11-01), Fitzgerald et al.
patent: 2825634 (1958-03-01), Rindone
patent: 3419370 (1968-12-01), Cramer et al.
patent: 3795523 (1974-03-01), Moriya et al.
patent: 3833511 (1974-09-01), Yamashith et al.
patent: 3834912 (1974-09-01), Gliemeroth
patent: 3920463 (1975-11-01), Simms
patent: 3938977 (1976-02-01), Gliemeroth
Deeg Emil W.
Krohn David A.
American Optical Corporation
Bashore S. Leon
Berkenstock, Jr. Howard R.
Duggan Jeremiah J.
Miga Frank W.
LandOfFree
Photochromic gradient lenses does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Photochromic gradient lenses, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photochromic gradient lenses will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-336841