US3926648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sintered cordierite glass-ceramic bodies
Assignee: Corning Glass Works
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Filing: 1974-06-07
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Granted: 1975-12-16
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Expires: 1994-06-07
Abstract
Abstract The present invention relates to means for sintering powdered glasses having compositions approximating the stoichiometry of cordierite (2MgO.2Al2O3.5SiO2) into strong bodies exhibiting low coefficients of thermal expansion and containing hexagonal cordierite as the crystal phase. Additions of minor amounts of K2O and/or Cs2O to the glass compositions are unique in imparting excellent sinterability at temperatures of 1050*C. and below, and yielding a body which retains a low coefficient of thermal expansion even after repeated thermal cycling to 1000*C.
Inventors
- 👤 David M Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:15
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0036; C03C10/0045
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
40 words
A SINTERED GLASS-CEMAMIC BODY CONTAINING HEXAGONAL CORDIERITE AS THE CRYSTALLINE PHASE, EXHIBITING A COEFFICIENT OF THERMAL EXPANSION (25*-1000*C.) BETWEEN ABOUT 13-18 10-7/*C., AND DEMONSTRATING A USE TEMPERATURE UP TO 13000*C. CONSISTING ESSENTIALLY, BY WEIGHT ON THE OXIDE BASIS, OF ABOUT
Claim 2
Dependent Claim
40 words
A SINTERED GLASS-CEMAMIC BODY CONTAINING HEXAGONAL CORDIERITE AS THE CRYSTALLINE PHASE, EXHIBITING A COEFFICIENT OF THERMAL EXPANSION (25*-1000*C.) BETWEEN ABOUT 13-18 10-7/*C., AND DEMONSTRATING A USE TEMPERATURE UP TO 13000*C. CONSISTING ESSENTIALLY, BY WEIGHT ON THE OXIDE BASIS, OF ABOUT
Claim 3
Dependent Claim
29 words
A sintered glass-ceramic body according to claim 1 consisting essentially, by weight on the oxide basis, of about 12.5-14.5% MgO, 34-36% Al2O3, 49-52% SiO2, and 0.5-2.5% K2O and/or Cs2O.
References Cited (Backward Citations)
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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) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |