US5336282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zirconia ceramics and a process of producing the same
Assignee: Eastman Kodak Co
•
Filing: 1992-12-21
•
Granted: 1994-08-09
•
Expires: 2012-12-21
Abstract
Abstract A zirconia ceramic having a tetragonal phase crystal grain structure and a process for producing same. The ceramic comprises zirconium oxide and a dopant that is an oxide of a rare earth element, calcium, or magnesium, or mixtures thereof, and the ceramic has a molar ratio of dopant to zirconium oxide in the range of from above about 3:97 to about 5:95 when the ceramic comprises less than about 0.5 mole percent of the oxide of magnesium, the ceramic has a molar ratio of dopant to zirconium oxide in the range of from about 0.5:99.5 to about 1.0:99.0 when the ceramic comprises from about 0.5 mole percent to about 1.0 mole percent of the oxide of magnesium, and the ceramic does not comprise more than about 1.0 mole percent of the oxide of magnesium.
Inventors
- 👤 Syamal K. Ghosh
- 👤 Dilip K. Chatterjee
- 👤 Dennis R. Koziol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:13
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/01; C04B35/48; C04B35/486
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
62 words
A net shape zirconia ceramic consisting essentially of zirconium oxide and a single dopant that is selected from oxides of the group consisting of a rare earth element and calcium, and wherein said ceramic has a molar ratio of dopant to zirconium oxide of about 4:96 to less than about 5:95, and wherein said ceramic consists essentially of tetragonal phase crystal grain.
Claim 2
Dependent Claim
62 words
A net shape zirconia ceramic consisting essentially of zirconium oxide and a single dopant that is selected from oxides of the group consisting of a rare earth element and calcium, and wherein said ceramic has a molar ratio of dopant to zirconium oxide of about 4:96 to less than about 5:95, and wherein said ceramic consists essentially of tetragonal phase crystal grain.
Claim 3
Dependent Claim
27 words
The ceramic of claim 1, wherein unessential ingredients are present in an amount not greater than from about 0.1 to 0.01 percent by weight of the ceramic.
Claim 4
Dependent Claim
66 words
A ceramic cutting tool comprising a net shape zirconia ceramic consisting essentially of zirconium oxide and a single dopant that is selected from oxides of the group consisting of a rare earth element and calcium, wherein said ceramic has a molar ratio of dopant to zirconium oxide of about 4:96 to less than about 5:95, and wherein said ceramic consists essentially of tetragonal phase crystal grain.
Claim 5
Dependent Claim
66 words
A ceramic cutting tool comprising a net shape zirconia ceramic consisting essentially of zirconium oxide and a single dopant that is selected from oxides of the group consisting of a rare earth element and calcium, wherein said ceramic has a molar ratio of dopant to zirconium oxide of about 4:96 to less than about 5:95, and wherein said ceramic consists essentially of tetragonal phase crystal grain.
Claim 6
Dependent Claim
16 words
The ceramic cutting tool of claim 3, wherein the dopant is Y 2 O 3 .
Claim 7
Dependent Claim
45 words
A net shape zirconia ceramic consisting essentially of zirconium oxide and magnesium oxide dopant, wherein said ceramic has a molar ratio of dopant to zirconium oxide of about 0.5:99.5 to less than about 1.0:99.0 and wherein said ceramic consists essentially of tetragonal phase crystal grain.
Claim 8
Dependent Claim
45 words
A net shape zirconia ceramic consisting essentially of zirconium oxide and magnesium oxide dopant, wherein said ceramic has a molar ratio of dopant to zirconium oxide of about 0.5:99.5 to less than about 1.0:99.0 and wherein said ceramic consists essentially of tetragonal phase crystal grain.
Claim 9
Dependent Claim
50 words
A ceramic cutting tool comprising a net shape zirconia ceramic consisting essentially of zirconium oxide and magnesium oxide dopant, wherein said ceramic has a molar ratio of dopant to zirconium oxide of about 0.5:99.5 to less than about 1.0:99.0 and wherein said ceramic consists essentially of tetragonal phase crystal grain.
Claim 10
Dependent Claim
50 words
A ceramic cutting tool comprising a net shape zirconia ceramic consisting essentially of zirconium oxide and magnesium oxide dopant, wherein said ceramic has a molar ratio of dopant to zirconium oxide of about 0.5:99.5 to less than about 1.0:99.0 and wherein said ceramic consists essentially of tetragonal phase crystal grain.
References Cited (Backward Citations)
US690911A
Cited
US3900542A
Cited
US4360598A
Cited
JPS589784A
Cited
US4626518A
Cited
US4430279A
Cited
US4587225A
Cited
US4490319A
Cited
EP0151335A1
Cited
US4610967A
Cited
US4666467A
Cited
US4866014A
Cited
US4886768A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-08-08 | 1998-02-07 | 1998-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-08 | 2002-02-07 | 2002-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-08 | 2006-02-07 | 2006-08-09 | $7700.00 | Window Closed / Lapsed |