US3834981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic and glass-ceramic articles produced from beta-spodumene
Assignee: Corning Glass Works
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Filing: 1972-10-27
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Granted: 1974-09-10
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Expires: 1992-10-27
Abstract
Abstract LOW-EXPANSION CERAMIC AND GLASS-CERAMIC ARTICLES MANUFACTURED FROM BETA-SPODUMENE LI2O3-AL2O3-SIO2 COMPOSITIONS USING A H+$LI+ ION-EXCHANGE PROCESS WHICH PRODUCES A HYDROXY-ALUMINOSILICATE PHASE CONVERTIBLE BY APPROPRIATE HEAT TREATMENT TO DESIRABLE ALUMINOSILICATE PHASES ARE DESCRIBED. THE LOW-EXPANSION CERAMIC AND GLASS-CERAMIC ARTICLES ARE USEFUL FOR CERTAIN HIGH-TEMPERATURE APPLICATIONS WHERE THE REACTIVITY OF LITHIUM ALUMINOSILICATES PRECLUDES THEIR USE.
Inventors
- 👤 D Grossman
- 👤 H Rittler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:49
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18; C04B35/19; B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01J; B01J21/00; B01J21/12; B01J37/00; B01J37/30; C03; C03C; C03C10/00; C03C10/0009; C03C10/0018; C03C10/0027; C03C21/00; C03C21/001; C03C21/006
Claims Analysis
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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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |