US4405672A
Expired / Lapsed
US
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Composite photochromic glass article and method of making
Assignee: Corning Glass Works
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Filing: 1982-03-15
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Granted: 1983-09-20
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Expires: 2002-03-15
Abstract
Abstract There is disclosed a composite photochromic glass article composed of a glass core and a thin surface layer substantially encasing that core, the core preferably containing a copper-cadmium halide photochromic crystal system and the substantially encasing glass layer preferably containing a copper-cadmium-silver halide photochromic crystal system. The article may be made by fusion laminating two separately formed glasses, or by introducing silver into a surface layer on a glass article by ion exchange.
Inventors
- 👤 Roger J. Araujo
- 👤 Nicholas F. Borrelli
- 👤 Paul A. Tick
- 👤 Donald M. Trotter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:01
CPC Classifications
B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10009; B32B17/10064; C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/091; C03C4/00; C03C4/04; C03C4/06; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/23; Y10T428/24; Y10T428/24802; Y10T428/24926; Y10T428/26; Y10T428/31; Y10T428/315
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
98 words
A composite photochromic glass article comprising a core portion and a thin surface layer substantially encasing that core portion, one of said core portion and encasing layer being composed of a first glass containing a copper-cadmium halide photochromic phase in a surface layer thereof, and the other of said component parts being composed of a second glass that has a copper-cadmium-silver halide photochromic phase developed therein, the depth of photochromic development in the article being not over about ten mils and exhibiting, in the darkened state, a color intermediate the characteristic red and green of the component glasses.
Claim 2
Dependent Claim
98 words
A composite photochromic glass article comprising a core portion and a thin surface layer substantially encasing that core portion, one of said core portion and encasing layer being composed of a first glass containing a copper-cadmium halide photochromic phase in a surface layer thereof, and the other of said component parts being composed of a second glass that has a copper-cadmium-silver halide photochromic phase developed therein, the depth of photochromic development in the article being not over about ten mils and exhibiting, in the darkened state, a color intermediate the characteristic red and green of the component glasses.
Claim 3
Dependent Claim
25 words
A composite photochromic glass article in accordance with claim 1 wherein the glass layer encasing the core portion is not over five mils in thickness.
Claim 4
Dependent Claim
30 words
A composite photochromic glass article in accordance with claim 1 wherein the thickness of the glass layer encasing the core portion is in the range of one to three mils.
Claim 5
Dependent Claim
42 words
A composite photochromic glass article in accordance with claim 1 wherein the core portion is composed of the glass containing a copper-cadmium halide photochromic phase, and the encasing layer is composed of the glass having a copper-cadmium-silver halide photochromic phase developed therein.
Claim 6
Dependent Claim
45 words
An article in accordance with claim 4 wherein the glass core portion is composed of a silicate base glass containing 0.3-10% of copper and/or cadmium and sufficient halogen, selected from chlorine, bromine and iodine, to react stoichiometrically with at least 0.3% total copper and/or cadmium.
Claim 7
Dependent Claim
23 words
An article in accordance with claim 5 wherein the selected halogen is chlorine and the photochromic phase in the core portion is copper-cadmium-chloride.
Claim 8
Dependent Claim
63 words
An article in accordance with claim 5 wherein the base glass consists essentially of 40-76% SiO 2 , 4-26% Al 2 O 3 , 4-26% B 2 O 3 , and at least one alkali metal oxide in the indicated proportions of 2-8% Li 2 O, 4-15% Na 2 O, 6-20% K 2 O, 8-25% Rb 2 O and 10-30% Cs 2 O.
Claim 9
Dependent Claim
68 words
An article in accordance with claim 4 wherein the encasing surface layer is composed of a silicate glass containing a photochromic phase which includes copper, cadmium, silver and at least one halogen selected from the group consisting of chlorine, bromine, and iodine, the respective contents thereof, in weight percent as calculated from the glass batch being at least 0.01% Ag, 0.03% CuO, 0.4% CdO and 0.3% total halogen.
Claim 10
Dependent Claim
22 words
An article in accordance with claim 8 wherein the selected halogen is chlorine and the photochromic phase in the layer is copper-cadmium-silver-chloride.
Claim 11
Dependent Claim
63 words
An article in accordance with claim 8 wherein the base glass consists essentially of 40-76% SiO 2 , 4-26% Al 2 O 3 , 4-26% B 2 O 3 , and at least one alkali metal oxide in the indicated proportions of 2-8% Li 2 O, 4-15% Na 2 O, 6-20% K 2 O, 8-25% Rb 2 O and 10-30% Cs 2 O.
Claim 12
Dependent Claim
46 words
An article in accordance with claim 1 wherein the glass core portion and the surface layer glass have the same composition, except that a portion of the alkali metal ion content of the surface layer has been replaced by a molecularly equivalent amount of silver ion.
Claim 13
Dependent Claim
16 words
An article in accordance with claim 1 wherein the glass article is a laminated glass sheet.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-19 | 1987-03-21 | 1987-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-19 | 1991-03-21 | 1991-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-19 | 1995-03-21 | 1995-09-20 | $7700.00 | Window Closed / Lapsed |