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US4259406A
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Method for producing selectively tinted photochromic glass lens and products
Assignee: Corning Glass Works
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Filing: 1979-11-19
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Granted: 1981-03-31
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Expires: 1999-11-19
Abstract
Abstract Selectively tinted photochromic glass lenses, such as photochromic lenses with a fixed tint gradient in transmittance ranging from a dark tint at the top of the lens to pale or no tinting at the bottom of the lens, are provided by a process comprising surface coloration and subsequent selective colored surface layer removal, without introducing optical aberrations into the lenses.
Inventors
- 👤 Nicholas F. Borrelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:37
CPC Classifications
C; C03; C03C; C03C23/00; C03C4/00; C03C4/04; C03C4/06; G; G02; G02C; G02C7/00; G02C7/10; G02C7/102; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/31; Y10T428/315
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
60 words
A method for making a selectively tinted photochromic glass lens which comprises the steps of: (a) heating a silver halide-containing photochromic glass lens under reducing conditions to provide a colored surface layer on at least a portion of said lens; and (b) chemically removing at least a portion of said colored surface layer to modify the color of said layer.
Claim 2
Independent Claim
60 words
A method for making a selectively tinted photochromic glass lens which comprises the steps of: (a) heating a silver halide-containing photochromic glass lens under reducing conditions to provide a colored surface layer on at least a portion of said lens; and (b) chemically removing at least a portion of said colored surface layer to modify the color of said layer.
Claim 3
Dependent Claim
18 words
A method in accordance with claim 1 wherein the photochromic glass lens is composed of a boroaluminosilicate glass.
Claim 4
Dependent Claim
27 words
A method in accordance with claim 2 wherein the portion of the colored surface layer is chemically removed by exposing the surface to an aqueous HF-containing solution.
Claim 5
Dependent Claim
51 words
A method in accordance with claim 1 which comprises the further step, following the chemical removal of at least a portion of the colored surface layer, of reheating the lens under reducing conditions to provide a second colored surface layer on at least a portion of the surface of the article.
Claim 6
Dependent Claim
29 words
A method in accordance with claim 4 wherein the article is reheated under reducing conditions at a temperature below that at which it was first heated under reducing conditions.
Claim 7
Dependent Claim
14 words
A selectively tinted photochromic glass lens provided according to the method of claim 1.
References Cited (Backward Citations)
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US3920463A
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US4036624A
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US4072490A
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US4160655A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-30 | 1984-09-29 | 1985-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-30 | 1988-09-29 | 1989-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-30 | 1992-09-29 | 1993-03-31 | $7700.00 | Window Closed / Lapsed |