US3873330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bi{hd 2{b O{HD 3 {B and Al{hd 2{b O{HD 3{B containing PbO-ZnO-B{HD 2{B O{HD 3 {B low temperature sealing glass
Assignee: International Business Machines Corp
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Filing: 1973-11-19
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Granted: 1975-03-25
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Expires: 1993-11-19
Abstract
Abstract Sealing glass which may be used for sealing glass plates together at relatively low temperatures. The glass has a softening temperature of about 412*C and has a thermal coefficient of expansion (from room temperature to 300*C) of about 84 X 10 7 per *C. The glass consists substantially of the following constituents in the following proportions: Percent by weight PbO 66.0 B2O3 14.0 ZnO 10.5 SiO2 2.0 CuO 2.5 Bi2O3 1.5 Al2O3 3.
Inventors
- 👤 Thomas A Sherk
- 👤 Rao R Tummala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:28
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/07; C03C3/072; C03C3/074; C03C3/0745; C03C27/00; C03C8/00; C03C8/24; C03C8/245
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
32 words
A SEALING GLASS COMPOSITION HAVING A THERMAL COEFFICIENT OF EXPANSION (FROM ROOM TEMPERATURE TO 300*C) OF ABOUT 84 X TO**7 PER *C CONSISTING ESSENTIALLY OF THE FOLLOWING INGREDIENTS IN THE FOLLOWING PROPORTIONS:
Claim 2
Dependent Claim
32 words
A SEALING GLASS COMPOSITION HAVING A THERMAL COEFFICIENT OF EXPANSION (FROM ROOM TEMPERATURE TO 300*C) OF ABOUT 84 X TO**7 PER *C CONSISTING ESSENTIALLY OF THE FOLLOWING INGREDIENTS IN THE FOLLOWING PROPORTIONS:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |