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US5145365A
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Glass orthodontic bracket
Assignee: Ormco Corp
•
Filing: 1990-12-14
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Granted: 1992-09-08
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Expires: 2010-12-14
Abstract
Abstract An orthodontic bracket made of a partially crystallized glass material and method for making same. The orthodontic bracket has a thin compressive outer crystalline layer.
Inventors
- 👤 Farrokh Farzin-Nia
- 👤 Richard W. Petticrew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:04
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/083; A; A61; A61C; A61C7/00; A61C7/12; C03C10/00; C03C10/0018; C03C10/0027; C03C10/0036; C03C10/0045; C03C3/085
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
38 words
An orthodontic bracket including a base portion having a tooth contacting surface and a body member including walls defining an archwire slot, said bracket being made of an amorphous glass material and having an outer crystalline strengthening layer.
Claim 2
Dependent Claim
38 words
An orthodontic bracket including a base portion having a tooth contacting surface and a body member including walls defining an archwire slot, said bracket being made of an amorphous glass material and having an outer crystalline strengthening layer.
Claim 3
Dependent Claim
46 words
An orthodontic bracket according to claim 1 wherein said glass is made of the following composition consisting essentially of: ______________________________________
Material Percentage
______________________________________
SiO.sub.2 61.8
Al.sub.2 O.sub.3
18.5
Z.sub.n O 12.5
Li.sub.2 O 5.3
TiO.sub.2 1.0
Na.sub.2 O .3
Sb.sub.2 O.sub.3
.5
K.sub.2 O .1
______________________________________
Claim 4
Dependent Claim
26 words
An orthodontic bracket according to claim 1 wherein said outer crystalline layer has a thickness in the range of about 0.0005 to 0.005 inches (0.0127-0.127 mm).
Claim 5
Dependent Claim
24 words
An orthodontic bracket according to claim 1 wherein said outer crystalline layer has a thickness in the range of about 0.0005 to 0.003 inches.
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) | 1995-09-08 | 1996-03-09 | 1996-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-08 | 2000-03-09 | 2000-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-08 | 2004-03-09 | 2004-09-08 | $7700.00 | Window Closed / Lapsed |