US3923529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sodalite-related glass compositions for production of photochromic and fluorescent articles
Assignee: Corning Glass Works
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Filing: 1975-01-10
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Granted: 1975-12-02
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Expires: 1995-01-10
Abstract
Abstract Compositions comprising sodium oxide and optionally other alkali metal oxides, a glass network-forming oxide such as SiO2 or GeO2, a modifying oxide such as Al2O3 or Ga2O3, a halogen such as Cl or F, and an electron donor constituent such as sulfur, selenium or tellurium, are melted to form glasses which may be reversibly photochromic, and are thermally crystallized to form glassceramics comprising sodalite or analogous crystal phases which are also reversibly photochromic. The glasses and glass-ceramics may also exhibit induced fluorescence in the activated (darkened) state.
Inventors
- 👤 Roger J Araujo
- 👤 George H Beall
- 👤 Loris G Sawchuk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:41
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C10/00; C03C3/064; C03C3/076; C03C3/11; C03C3/112; C03C3/12; C03C3/23; C03C4/00; C03C4/04; C03C4/06; C03C4/065; C03C4/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
134 words
A GLASS COMPOSITION USEFUL FOR THE PRODUCTION OF PHOTOCHROMIC GLASS AND GLASS-CERAMIC ARTICLES WHICH CONSISTS ESSENTIALLY OF, IN WEIGHT PERCENT AS CALCULATED FROM THE BATCH, ABOUT 17-34% TOTAL OF ALKALI METAL OXIDES, ESSENTIALLY INCLUDING NA2O, SELECTED IN THE INDICATED PROPORTION FROM THE GROUP CONSISTING OF 12-33% NA2O, 0-20% K2O, AND 0-7% CS2O; 17-33% TOTAL OF MODIFYING OXIDES SELECTED FROM THE GROUP CONSISTING OF AL2O3 AND GA2O3; 22-54% TOTAL OF NETWORK-FORMING OXIDES SELECTED IN AMOUNTS NOT EXCEEDING THE INDICATED PROPORTIONS FROM THE GROUP CONSISTING OF UP TO 41% SIO2 AND UP TO 54% GEO2; 2.5-30% TOTAL OF HALOGEN SELECTED IN AMOUNTS NOT EXCEEDING THE INDICATED PROPORTIONS FROM THE GROUP CONSISTING OF UP TO 9% F AND UP TO 30% CL; AND 1-10% TOTAL OF CONSTITUENTS SELECTED FROM THE GROUP CONSISTING OF SO3, SEO2 AND TE.
Claim 2
Dependent Claim
134 words
A GLASS COMPOSITION USEFUL FOR THE PRODUCTION OF PHOTOCHROMIC GLASS AND GLASS-CERAMIC ARTICLES WHICH CONSISTS ESSENTIALLY OF, IN WEIGHT PERCENT AS CALCULATED FROM THE BATCH, ABOUT 17-34% TOTAL OF ALKALI METAL OXIDES, ESSENTIALLY INCLUDING NA2O, SELECTED IN THE INDICATED PROPORTION FROM THE GROUP CONSISTING OF 12-33% NA2O, 0-20% K2O, AND 0-7% CS2O; 17-33% TOTAL OF MODIFYING OXIDES SELECTED FROM THE GROUP CONSISTING OF AL2O3 AND GA2O3; 22-54% TOTAL OF NETWORK-FORMING OXIDES SELECTED IN AMOUNTS NOT EXCEEDING THE INDICATED PROPORTIONS FROM THE GROUP CONSISTING OF UP TO 41% SIO2 AND UP TO 54% GEO2; 2.5-30% TOTAL OF HALOGEN SELECTED IN AMOUNTS NOT EXCEEDING THE INDICATED PROPORTIONS FROM THE GROUP CONSISTING OF UP TO 9% F AND UP TO 30% CL; AND 1-10% TOTAL OF CONSTITUENTS SELECTED FROM THE GROUP CONSISTING OF SO3, SEO2 AND TE.
Claim 3
Dependent Claim
26 words
A composition in accordance with claim 1 which further contains 0-15% B2O3, and 0-10% total of oxides selected from the group consisting of CdO and ZnO.
Claim 4
Dependent Claim
14 words
A glass composition in accordance with claim 1 wherein the selected halogen is fluorine.
Claim 5
Dependent Claim
33 words
A glass composition in accordance with claim 3 consisting essentially, in weight percent as calculated from the batch, of about 31-35% SiO2, 26-30% Al2O3, 26-30% Na2O, 0-10% B2O3, 4-7% F and 1-5% SO3.
References Cited (Backward Citations)
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US3649311A
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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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |