US5430573A
Expired / Lapsed
US
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UV-absorbing, polarizing glass article
Assignee: Corning Inc
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Filing: 1993-12-15
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Granted: 1995-07-04
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Expires: 2013-12-15
Abstract
Abstract A UV-absorbing, polarizing glass article and method of making, the glass having an R 2 O-B 2 O 3 -SiO 2 base glass composition, a sharp spectral cut-off at about 400 nm, a precipitated crystal phase consisting of a halide selected from the group composed of cuprous, cadmium and mixed cuprous-cadmium halides, the crystallites in the crystal phase being elongated, and a portion of the crystallites near the surface of the article being at least partially reduced to colloidal copper, whereby the article exhibits permanent dichroic behavior.
Inventors
- 👤 Roger J. Araujo
- 👤 Nicholas F. Borrelli
- 👤 Josef C. Lapp
- 👤 David W. Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:12
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/02; C03B23/023; C03B23/03; C03B23/025; C03B23/0256; C03C; C03C14/00; C03C14/006; C03C23/00; C03C23/007; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/091; C03C3/11; C03C4/00; C03C4/04; C03C4/06; C03C4/065; C03C4/08; C03C4/085; G; G02; G02B; G02B5/00; G02B5/20; G02B5/22; G02B5/23; G02B5/30; G02B5/3025; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/905
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
84 words
A UV-absorbing, polarizing glass article, the glass having an R 2 O-B 2 O 3 -SiO 2 base glass composition, a sharp spectral cut-off at about 400 nm, a precipitated crystal phase consisting of halide crystallites selected from the group composed of cuprous, cadmium and mixed cuprous-cadmium halide crystallites, the crystallites in the crystal phase being elongated, and a portion of the crystallites near the surface of the article being at least partially reduced to colloidal copper, whereby the article exhibits permanent dichroic behavior.
Claim 2
Dependent Claim
84 words
A UV-absorbing, polarizing glass article, the glass having an R 2 O-B 2 O 3 -SiO 2 base glass composition, a sharp spectral cut-off at about 400 nm, a precipitated crystal phase consisting of halide crystallites selected from the group composed of cuprous, cadmium and mixed cuprous-cadmium halide crystallites, the crystallites in the crystal phase being elongated, and a portion of the crystallites near the surface of the article being at least partially reduced to colloidal copper, whereby the article exhibits permanent dichroic behavior.
Claim 3
Dependent Claim
32 words
An article in accordance with claim 1 wherein the glass composition includes 0.2-2.0 weight percent copper calculated as Cu 2 O and 0.25-2.0% of a halogen selected from bromine, chlorine and mixtures.
Claim 4
Dependent Claim
110 words
An article in accordance with claim 1 wherein the glass composition consists essentially of, as calculated from the glass batch in weight percent on an oxide and halogen basis; 40-80% SiO 2 , 4-35% B 2 O 3 , 0-26% Al 2 O 3 , 0-8% Li 2 O, 0-15% Na 2 O, 0-20% K 2 O the total Li 2 O+Na 2 O+K 2 O being 2-20%, 0-10% Cao+BaO+SrO, 0.2-2% Cu 2 O, 0-2% CdO, 0-12% ZrO 2 , 0-2.5% SnO 2 , 0-2% As 2 O 3 +Sb 2 O 3 , 0-2 Cl, 0-2% Br, 0.25-2.0% Cl+Br, 0-2% F, with an R-value in the range of 0.15-0.45.
Claim 5
Dependent Claim
14 words
An article in accordance with claim 1 wherein the glass is a non-photochromic glass.
Claim 6
Dependent Claim
108 words
A non-photochromic glass article in accordance with claim 4 wherein the glass composition consists essentially of, as calculated from the glass batch in weight percent on an oxide and halogen basis, 48-80% SiO 2 , 10-35% B 2 O 3 , 0-12% Al 2 O 3 , 0-4% Li 2 O, 0-14% Na 2 O, 0-12% K 2 O, 4-15% Li 2 O+Na 2 O+K 2 O, 0-10% CaO+BaO+SrO, 0.2-1.6% Cu 2 O, 0-2% CdO, 0-12% ZrO 2 , 0-2.5% SnO 2 , 0-2% As 2 O 3 +Sb 2 O 3 , 0-1.75 Cl, 0-1% Br, 0.25-2.0% Cl+Br, 0-2% F, with an R-value in the range 0.15-0.45.
Claim 7
Dependent Claim
14 words
An article in accordance with claim 1 wherein the glass is a photochromic glass.
Claim 8
Dependent Claim
67 words
A photochromic glass article in accordance with claim 6 wherein the glass composition consists essentially of, as calculated from the glass batch in weight percent on an oxide and halogen basis, 40-75% SiO 2 , 4-26% B 2 O 3 , 4-26% Al 2 O 3 , 2-8% Li 2 O, 4-15% Na 2 O, 6-20% K 2 O, 0.3-2% Cu 2 O, 0-2% Cl+Br, 0-2% F.
Claim 9
Independent Claim
116 words
A method of producing a UV-absorbing, polarizing glass article which comprises the steps of melting a batch for a R 2 O-B 2 O 3 -SiO 2 base glass containing at least 0.2% by weight Cu 2 O together with a sufficient amount of at least one halogen selected from chlorine and bromine to react with at least 0.2% copper, precipitating cuprous halide crystallites in the glass, subjecting the glass to a stress in one direction to elongate the glass and the cuprous halide crystallites therein, and then exposing the glass to a reducing atmosphere to reduce at least a portion of the copper halide crystallites in a thin layer near the surface of the glass.
Claim 10
Independent Claim
116 words
A method of producing a UV-absorbing, polarizing glass article which comprises the steps of melting a batch for a R 2 O-B 2 O 3 -SiO 2 base glass containing at least 0.2% by weight Cu 2 O together with a sufficient amount of at least one halogen selected from chlorine and bromine to react with at least 0.2% copper, precipitating cuprous halide crystallites in the glass, subjecting the glass to a stress in one direction to elongate the glass and the cuprous halide crystallites therein, and then exposing the glass to a reducing atmosphere to reduce at least a portion of the copper halide crystallites in a thin layer near the surface of the glass.
Claim 11
Dependent Claim
29 words
A method in accordance with claim 8 which further comprises cooling the molten glass while avoiding crystallite formation, and thereafter reheating the glass to thermally precipitate cuprous halide crystallites.
Claim 12
Dependent Claim
21 words
A method in accordance with claim 9 wherein the glass is reheated to a temperature in the range of 500°-900° C.
Claim 13
Dependent Claim
25 words
A method in accordance with claim 8 wherein the glass is exposed to a reducing atmosphere at a temperature of at least about 400° C.
Claim 14
Dependent Claim
13 words
A method in accordance with claim 8 wherein the reducing atmosphere is hydrogen.
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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) | 1998-07-03 | 1999-01-02 | 1999-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-07-03 | 2003-01-02 | 2003-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-07-03 | 2007-01-02 | 2007-07-04 | $7700.00 | Window Closed / Lapsed |