US4259406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing selectively tinted photochromic glass lens and products
Assignee: Corning Glass Works
•
Filing: 1979-11-19
•
Granted: 1981-03-31
•
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 14:05
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)
US3892582A
Cited
US3920463A
Cited
US4036624A
Cited
US4072490A
Cited
US4118214A
Cited
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 |