US3634113A
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US
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Stabilized zirconium dioxide and hafnium dioxide compositions
Assignee: LARRY L FEHRENBACHER
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Filing: 1968-10-30
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Granted: 1972-01-11
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Expires: 1988-10-30
Abstract
Abstract A type C mixed rare earth oxide solid solution is used to eliminate the monoclinic phase of zirconium dioxide and thus produce a stable refractory. The type C solid solution consists primarily of oxides of dysprosium, erbium, ytterbium, and holmium with small amounts of thulium, terbium, and lutetium. This solid solution is applicable to hafnium dioxide and to mixtures of hafnium dioxide with zirconium dioxide as well.
Inventors
- 👤 Larry L Fehrenbacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:22
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/46; C04B35/50
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
41 words
A stabilized cubic metal oxide according to claim 1 wherein said type C mixed rare earth oxide contains about 15.2 percent Yb2O3, 45.0 percent Dy2O3, 28.0 percent Er2O3, 9.2 percent Ho2O3, 1.3 percent Tb2O3, 1 percent Tm2O3, and 0.3 percent Lu2O3.
Claim 2
Dependent Claim
15 words
A stabilized cubic metal oxide according to claim 1 wherein said metal oxide is ZrO2.
Claim 3
Dependent Claim
15 words
A stabilized cubic metal oxide according to claim 1 wherein said metal oxide is HfO2.
Claim 4
Dependent Claim
20 words
A stabilized cubic metal oxide according to claim 1 wherein said metal oxide is a mixture of ZrO2 and HfO2.
Claim 5
Dependent Claim
15 words
A stabilized cubic metal oxide according to claim 2 wherein said metal oxide is ZrO2.
Claim 6
Dependent Claim
15 words
A stabilized cubic metal oxide according to claim 2 wherein said metal oxide is HfO2.
Claim 7
Dependent Claim
20 words
A stabilized cubic metal oxide according to claim 2 wherein said metal oxide is a mixture of ZrO2 and HfO2.
References Cited (Backward Citations)
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Cited
US3259585A
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US3268349A
Cited
US3404039A
Cited
US3404040A
Cited
US3432314A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |