Patent US4915625A successfully refreshed from Google Patents.
US4915625A
Expired / Lapsed
US
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Ceramic orthodontic bracket
Assignee: Tosoh Corp
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Filing: 1988-06-30
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Granted: 1990-04-10
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Expires: 2008-06-30
Abstract
Abstract A ceramic orthodontic bracket having an unobtrusive color, is obtained by sintering a molded body of a powdery mixture composed of 2-15 mole % of yttrium oxide, 5-20 mole % of titanium dioxide and the balance of zirconia.
Inventors
- 👤 Koji Tsukuma
- 👤 Seiji Oda
- 👤 Hirotoshi Haga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:22
CPC Classifications
A; A61; A61C; A61C7/00; A61C7/12; C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/49
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
73 words
A ceramic orthodontic bracket having first and second faces, said first face having a shape appropriate for attachment to a tooth and said second face having wire support means, wherein said bracket is composed of a sintered body consisting essentially of 2 to 15% by mole of yttrium oxide (Y 2 O 3 ), 5 to 20% by mole of titanium dioxide (TiO 2 ) and a balance of zirconia (ZrO 2 ).
Claim 2
Dependent Claim
73 words
A ceramic orthodontic bracket having first and second faces, said first face having a shape appropriate for attachment to a tooth and said second face having wire support means, wherein said bracket is composed of a sintered body consisting essentially of 2 to 15% by mole of yttrium oxide (Y 2 O 3 ), 5 to 20% by mole of titanium dioxide (TiO 2 ) and a balance of zirconia (ZrO 2 ).
Claim 3
Dependent Claim
37 words
The bracket according to claim 1, which is composed of a sintered body consisting essentially of 6 to 8% by mole of yttrium oxide, 10 to 15% by mole of titanium dioxide and the balance of zirconia.
Claim 4
Dependent Claim
73 words
A ceramic orthodontic bracket having first and second faces, said first face having a shape appropriate for attachment to a tooth and said second face having a longitudinal groove, wherein said bracket is composed of a sintered body consisting essentially of 2 to 15% by mole of yttrium oxide (Y 2 O 3 ), 5 to 20% by mole of titanium dioxide (TiO 2 ) and a balance of zirconia (ZrO 2 ).
Claim 5
Dependent Claim
73 words
A ceramic orthodontic bracket having first and second faces, said first face having a shape appropriate for attachment to a tooth and said second face having a longitudinal groove, wherein said bracket is composed of a sintered body consisting essentially of 2 to 15% by mole of yttrium oxide (Y 2 O 3 ), 5 to 20% by mole of titanium dioxide (TiO 2 ) and a balance of zirconia (ZrO 2 ).
Claim 6
Dependent Claim
13 words
The bracket of claim 3, wherein said longitudinal groove comprises wire support means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-09 | 1993-10-09 | 1994-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-09 | 1997-10-09 | 1998-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-09 | 2001-10-09 | 2002-04-10 | $7700.00 | Window Closed / Lapsed |