US5147833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alumina-zirconia ceramic
Assignee: Cooper Industries LLC
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Filing: 1991-04-05
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Granted: 1992-09-15
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Expires: 2011-04-05
Abstract
Abstract A ceramic article is disclosed. The article is composed of from 6 to 50 percent of particulate ZrO 2 having an ultimate particle size less than 2 μm, from 50 to 94 percent of particulate Al 2 O 3 , from 1/4 to 3 percent of MnO 2 and from 1/4 to 3 percent of TiO 2 .
Inventors
- 👤 William R. Manning
- 👤 Terrence K. Brog
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:31
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/486; C04B35/488; C04B35/4885; C04B35/10; C04B35/111; C04B35/117; C04B35/119
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
84 words
A ceramic article produced by firing a shape pressed from a ceramic batch which consists of from 6 to 50 percent of particulate ZrO 2 having an ultimate particle size less than 2 μm, from 50 to 94 percent of particulate Al 2 O 3 , from 1/4 to 3 percent of MnO 2 and from 1/4 to 3 percent of TiO 2 to a temperature sufficiently high to mature the ceramic but not sufficiently high to cause a degradation of the strength thereof.
Claim 2
Dependent Claim
84 words
A ceramic article produced by firing a shape pressed from a ceramic batch which consists of from 6 to 50 percent of particulate ZrO 2 having an ultimate particle size less than 2 μm, from 50 to 94 percent of particulate Al 2 O 3 , from 1/4 to 3 percent of MnO 2 and from 1/4 to 3 percent of TiO 2 to a temperature sufficiently high to mature the ceramic but not sufficiently high to cause a degradation of the strength thereof.
Claim 3
Dependent Claim
40 words
A ceramic article as claimed in claim 1 wherein from 40 to 60 percent of the particulate ZrO 2 in the batch is in a metastable tetragonal crystal structure and from 60 to 40 percent thereof has no monoclinic structure.
Claim 4
Dependent Claim
64 words
A ceramic article produced by firing a shape pressed from a ceramic batch which consists essentially of from 15 to 25 percent of particulate ZrO 2 having an ultimate particle size less than 2 μm, from 75 to 85 percent of particulate Al 2 O 3 , from 1/4 to 3 percent of MnO 2 and from 1/4 to 3 percent TiO 2 .
Claim 5
Dependent Claim
64 words
A ceramic article produced by firing a shape pressed from a ceramic batch which consists essentially of from 15 to 25 percent of particulate ZrO 2 having an ultimate particle size less than 2 μm, from 75 to 85 percent of particulate Al 2 O 3 , from 1/4 to 3 percent of MnO 2 and from 1/4 to 3 percent TiO 2 .
Claim 6
Dependent Claim
25 words
A ceramic article as claimed in claim 1 wherein the batch contains from 1/2 to 2 percent each of MnO 2 and TiO 2 .
Claim 7
Dependent Claim
40 words
A ceramic article as claimed in claim 4 wherein from 40 to 60 percent of the particulate ZrO 2 in the batch is in a metastable tetragonal crystal structure and from 60 to 40 percent thereof has a monoclinic structure.
Claim 8
Dependent Claim
25 words
A ceramic article as claimed in claim 3 wherein the MnO 2 and the TiO 2 are present in substantially equal proportions in the batch.
Claim 9
Dependent Claim
40 words
A ceramic article as claimed in claim 6 wherein from 40 to 60 percent of the particulate ZrO 2 in the batch is in a metastable tetragonal crystal structure and from 60 to 40 percent thereof has a monoclinic structure.
References Cited (Backward Citations)
US3916585A
Cited
US4760038A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-15 | 1996-03-16 | 1996-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-15 | 2000-03-16 | 2000-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-15 | 2004-03-16 | 2004-09-15 | $7700.00 | Window Closed / Lapsed |