US4792535A
Expired / Lapsed
US
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UV-transmitting glasses
Assignee: Corning Glass Works
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Filing: 1987-09-02
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Granted: 1988-12-20
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Expires: 2007-09-02
Abstract
Abstract Alkali boroaluminosilicate glasses exhibiting moderately high thermal expansion coefficients, good melting characteristics, and a UV transmittance of at least 80% in 1 mm thickness at a wavelength of 254 nm are described, such glasses consisting essentially of about 58-62%, SiO2, 15-18% B2O3, 11.5-14.5% Al2O3, 1-2.5% Li2O, 5.5-6.5% Na2O, 0-2% K2O, and 0-0.6% Cl.
Inventors
- 👤 Gerald J. Fine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:26
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/11; C03C3/089; C03C3/091; C03C4/00; C03C4/0085; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/905
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
An ultraviolet transmitting glass article consisting essentially, in weight percent, of about 58-62% SiO 2 , 15-18% B 2 O 3 , 11.5-14.5% Al 2 O 3 , 1-2.5% Li 2 O, 5.5-6.5% Na 2 O, 0-2.0% K 2 O, and 0-0.6% Cl, the article having a thermal expansion coefficient (0°-300° C.) in the range of 56-62×10 -7 /°C. and an ultraviolet transmittance, in 1 mm cross section, of at least 80% at a wavelength of 254 nm.
Claim 2
Dependent Claim
78 words
An ultraviolet transmitting glass article consisting essentially, in weight percent, of about 58-62% SiO 2 , 15-18% B 2 O 3 , 11.5-14.5% Al 2 O 3 , 1-2.5% Li 2 O, 5.5-6.5% Na 2 O, 0-2.0% K 2 O, and 0-0.6% Cl, the article having a thermal expansion coefficient (0°-300° C.) in the range of 56-62×10 -7 /°C. and an ultraviolet transmittance, in 1 mm cross section, of at least 80% at a wavelength of 254 nm.
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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) | 1991-12-20 | 1992-06-20 | 1992-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-20 | 1996-06-20 | 1996-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-20 | 2000-06-20 | 2000-12-20 | $7700.00 | Window Closed / Lapsed |