Patent US4784606A successfully refreshed from Google Patents.
US4784606A
Expired / Lapsed
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Orthodontic brackets made from ion exchange strengthened glass
Assignee: "A"-COMPANY
•
Filing: 1987-04-10
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Granted: 1988-11-15
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Expires: 2007-04-10
Abstract
Abstract Orthodontic brackets are made from ion exchange strengthened glass. In a preferred embodiment, the glass is a lithium alumino silicate srengthened with sodium ions.
Inventors
- 👤 Robin M. F. Jones
- 👤 Carl Panzera
- 👤 Robert D. DeLuca
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:36
CPC Classifications
A; A61; A61C; A61C7/00; A61C7/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
29 words
An orthodontic bracket including a base member having a tooth contacting surface, and a body member including walls defining an archwire groove, said bracket comprising ion exchange strengthened glass.
Claim 2
Dependent Claim
29 words
An orthodontic bracket including a base member having a tooth contacting surface, and a body member including walls defining an archwire groove, said bracket comprising ion exchange strengthened glass.
Claim 3
Dependent Claim
39 words
The bracket of claim 1 wherein said bracket has a torque strength such that it has at least a 95 per cent probability, by Weibull statistical analysis, of surviving a torque force in the archwire groove of 1000 gram-centimeters.
Claim 4
Dependent Claim
18 words
The bracket of claim 1 wherein the glass is a lithium alumino silicate glass strengthened with sodium ions.
Claim 5
Dependent Claim
18 words
The bracket of claim 2 wherein the glass is a lithium alumino silicate glass strengthened with sodium ions.
References Cited (Backward Citations)
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Cited
US3573020A
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US4074992A
Cited
US4216583A
Cited
US4216583B1
Cited
US4189325A
Cited
US4595598A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-15 | 1992-05-16 | 1992-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-15 | 1996-05-16 | 1996-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-15 | 2000-05-16 | 2000-11-15 | $7700.00 | Window Closed / Lapsed |