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Patent US4412819A successfully refreshed from Google Patents.
US4412819A
Expired / Lapsed
US
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Orthodontic arch wire
Assignee: Individual
•
Filing: 1982-09-15
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Granted: 1983-11-01
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Expires: 2002-09-15
Abstract
Abstract An orthodontic arch wire having anterior and posterior segments of different elasticity or stiffness to enable early and simultaneous treatment of teeth in the entire dental arch. The wire is preferably made by uniting a central segment of relatively resilient wire with end or posterior segments of a different and more rigid wire. Different cross-sectional shapes may also be used in the several segments.
Inventors
- 👤 James L. Cannon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:44
CPC Classifications
A; A61; A61C; A61C7/00; A61C7/12; A61C7/20
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
62 words
An orthodontic arch wire, comprising a generally U-shaped assembly of an elongated anterior segment, and a pair of spaced-apart elongated posterior segments secured to and extending from respective ends of the anterior segment, the anterior segment being made of a material having a flexural rigidity which is lower than the flexural rigidity of material forming at least one of the posterior segments.
Claim 2
Dependent Claim
62 words
An orthodontic arch wire, comprising a generally U-shaped assembly of an elongated anterior segment, and a pair of spaced-apart elongated posterior segments secured to and extending from respective ends of the anterior segment, the anterior segment being made of a material having a flexural rigidity which is lower than the flexural rigidity of material forming at least one of the posterior segments.
Claim 3
Dependent Claim
24 words
The arch wire of claim 1 wherein the flexural rigidity of the anterior segment is lower than the flexural rigidity of both posterior segments.
Claim 4
Dependent Claim
33 words
The arch wire of claim 2 wherein the adjacent segments are overlapped and further comprising a crimpable tube at each segment junction and fitted over the overlapping segments to secure the segments together.
Claim 5
Dependent Claim
24 words
The arch wire of claim 3 wherein facing surfaces of the overlapping segments are flattened to resist relative rotation when the tube is crimped.
Claim 6
Dependent Claim
20 words
The arch wire of claim 4, and further comprising a hook member secured to and extending from each crimpable tube.
Claim 7
Dependent Claim
33 words
The arch wire of claim 3 wherein the anterior segment is dimensioned to span the central and lateral incisor teeth when installed, and the crimpable tubes are positioned distally of the incisor teeth.
Claim 8
Dependent Claim
14 words
The arch wire of claim 2 wherein the segments are secured together by welding.
Claim 9
Dependent Claim
15 words
The arch wire of claim 2 wherein the posterior segments have the same flexural rigidity.
Claim 10
Dependent Claim
14 words
The arch wire of claim 2 wherein the posterior segments have different flexural rigidities.
Claim 11
Dependent Claim
14 words
The arch wire of claim 2 wherein each segment is a single metal strand.
Claim 12
Dependent Claim
14 words
The arch wire of claim 10 wherein the anterior segment is a titanium alloy.
Claim 13
Dependent Claim
23 words
The arch wire of claim 11 wherein the anterior segment is made of Nitinol, and the posterior segments are made of stainless steel.
Claim 14
Dependent Claim
17 words
The arch wire of claim 10 wherein the anterior and posterior segments have the same cross-sectional shape.
Claim 15
Dependent Claim
27 words
The arch wire of claim 10 wherein the anterior segment has a cross-sectional shape differing from the cross-sectional shape of at least one of the posterior segments.
References Cited (Backward Citations)
US1938428A
Cited
US2318001A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |