Patent US4063955A successfully refreshed from Google Patents.
US4063955A
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Low thermal expansion ceramics of cordierite solid solution and method for producing same
Assignee: GTE Sylvania Inc
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Filing: 1975-10-03
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Granted: 1977-12-20
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Expires: 1995-10-03
Abstract
Abstract Low thermal expansion ceramics of essentially 100 percent cordierite solid solution are prepared by the devitrification of a glass frit compact having the nominal composition in weight percent 16 percent MgO, 30 percent Al 2 O 3 , 54 percent SiO 2 . These ceramics exhibit adequate density and strength and are useful for example in the fabrication of gas turbine engine components such as rotor vanes and heat exchangers.
Inventors
- 👤 Carl William Fritsch, Jr.
- 👤 Robert Wade Wolfe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:01
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0036; C03C10/0045; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18; C04B35/195; F; F01; F01D; F01D5/00; F01D5/12; F01D5/28; F01D5/284
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
58 words
A ceramic body characterized by consisting essentially of cordierite solid solution of from 14 to 18 weight percent MgO, 28 to 32 weight percent Al 2 O 3 , and 52 to 56 weight percent SiO 2 , and having a linear thermal expansion of less than 900 ppm over the temperature range 25° C to 800° C.
Claim 2
Dependent Claim
58 words
A ceramic body characterized by consisting essentially of cordierite solid solution of from 14 to 18 weight percent MgO, 28 to 32 weight percent Al 2 O 3 , and 52 to 56 weight percent SiO 2 , and having a linear thermal expansion of less than 900 ppm over the temperature range 25° C to 800° C.
Claim 3
Dependent Claim
36 words
The ceramic body of claim 1 wherein the composition ranges from 15 to 17 weight percent MgO, 29 to 31 weight percent Al 2 O 3 , and 53 to 55 weight percent SiO 2 .
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) | 1980-12-19 | 1981-06-20 | 1981-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-19 | 1985-06-20 | 1985-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-19 | 1989-06-20 | 1989-12-20 | $7700.00 | Window Closed / Lapsed |