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US3681097A
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Low expansion zinc petalite-beta quartz glass-ceramic articles
Assignee: Corning Glass Works
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Filing: 1970-08-19
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Granted: 1972-08-01
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Expires: 1990-08-19
Abstract
Abstract THIS INVENTION RELATES TO THE MANUFACTURE OF GLASSCERAMIC ARTICLES EXHIBITING VERY LOW COEFFICIENTS OF THERMAL EXPANSION WHICH HAVE COMPOSITIONS IN THE ZN0-AL2O3SIO2 FIELD. THE ESSENTIAL ABSENCE OF ALKALI METAL IN THE COMPOSITIONS ENDOWS THE PRODUCTS OF THIS INVENTION WITH HIGH ELECTRICAL RESISTIVITY.
Inventors
- 👤 George H Beall
- 👤 Francis W Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:11
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0036; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C3/085
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |