Patent US1933595A successfully refreshed from Google Patents.
Patent US4758541A successfully refreshed from Google Patents.
US4758541A
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Zirconia sintered body of improved light transmittance
Assignee: Tosoh Corp
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Filing: 1986-06-20
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Granted: 1988-07-19
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Expires: 2006-06-20
Abstract
Abstract A zirconia sintered body comprising zirconia (ZrO2), yttria (Y2O3) and titania (TiO2) [Y2O3/ZrO2=at least 2/98 by mole and TiO2/(ZrO2+Y2O3)=3/97 to 20/80 by mole] has a high translucence giving improved light transmittance. A zirconia sintered body comprising, in addition to ZrO2, Y2O3 and TiO2, 0.1 to 3 mole % of an oxide of a rare earth element of the lanthanum group has a fluorescence-radiating property as well as a high translucence.
Inventors
- 👤 Koji Tsukuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:39
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/486; C04B35/49; G; G02; G02B; G02B1/00; G02B1/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
59 words
A translucent zirconia sintered body consisting essentially of zirconia (ZrO 2 ), yttria (Y 2 O 3 ) and titania (TiO 2 ), the molar ratio of Y 2 O 3 /ZrO 2 being at least 2/98 and the molar ratio of TiO 2 /(ZrO 2 +Y 2 O 3 being in the range of from 3/97 to 20/80.
Claim 2
Dependent Claim
59 words
A translucent zirconia sintered body consisting essentially of zirconia (ZrO 2 ), yttria (Y 2 O 3 ) and titania (TiO 2 ), the molar ratio of Y 2 O 3 /ZrO 2 being at least 2/98 and the molar ratio of TiO 2 /(ZrO 2 +Y 2 O 3 being in the range of from 3/97 to 20/80.
Claim 3
Dependent Claim
26 words
A translucent zirconia sintered body as set forth in claim 1, wherein the molar ratio of Y 2 O 3 /ZrO 2 is at least 6/94.
Claim 4
Dependent Claim
54 words
A translucent zirconia sintered body as set forth in claim 1, wherein the molar ratio of Y 2 O 3 /ZrO 2 is in the range of from 6/94 to 9/91 and the molar ratio of TiO 2 /(ZrO 2 +Y 2 O 3 ) is in the range of from 5/95 to 20/80.
Claim 5
Dependent Claim
91 words
A translucent, fluorescence-radiating zirconia sintered body consisting essntially of zirconia (ZrO 2 ), yttria (Y 2 O 3 ), titania (TiO 2 ) and an oxide of a rare earth element of the lanthanum group, the molar ratio of Y 2 O 3 /ZrO 2 being at least 6/94, the molar ratio of TiO 2 /(ZrO 2 +Y 2 O 3 ) being in the range of from 3/97 to 20/80, and the amount of the rare earth element oxide being 0.1 to 3 mole % based on the sintered body.
Claim 6
Dependent Claim
91 words
A translucent, fluorescence-radiating zirconia sintered body consisting essntially of zirconia (ZrO 2 ), yttria (Y 2 O 3 ), titania (TiO 2 ) and an oxide of a rare earth element of the lanthanum group, the molar ratio of Y 2 O 3 /ZrO 2 being at least 6/94, the molar ratio of TiO 2 /(ZrO 2 +Y 2 O 3 ) being in the range of from 3/97 to 20/80, and the amount of the rare earth element oxide being 0.1 to 3 mole % based on the sintered body.
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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) | 1991-07-19 | 1992-01-18 | 1992-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-19 | 1996-01-18 | 1996-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-19 | 2000-01-18 | 2000-07-19 | $7700.00 | Window Closed / Lapsed |