Patent US4927361A successfully refreshed from Google Patents.
US4927361A
Expired / Lapsed
US
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Orthodontic attachments
Assignee: Individual
•
Filing: 1984-03-30
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Granted: 1990-05-22
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Expires: 2004-03-30
Abstract
Abstract Orthodontic brackets or other dental attachments are provided with particulate material on the tooth engaging surface thereof to improve the bonding of bracket to a tooth surface.
Inventors
- 👤 Dennis C. Smith
- 👤 Rolf Maijer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:51
CPC Classifications
A; A61; A61C; A61C7/00; A61C7/12; A61C7/14; A61C7/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
43 words
In a dental attachment for affixing by adhesive bonding to a tooth surface and having a tooth engaging surface suitable for effecting said adhesive bonding of said attachment to a tooth surface, the improvement which comprises particulate material on said tooth engaging surface.
Claim 2
Dependent Claim
43 words
In a dental attachment for affixing by adhesive bonding to a tooth surface and having a tooth engaging surface suitable for effecting said adhesive bonding of said attachment to a tooth surface, the improvement which comprises particulate material on said tooth engaging surface.
Claim 3
Dependent Claim
33 words
The dental attachment of claim 1 wherein said particulate material is joined together at its points of contact to define a porous coating on said surface having an interconnected network of pores therein.
Claim 4
Dependent Claim
37 words
The dental attachment of claim 1 wherein said coating has a thickness of less than about 500 microns, a porosity of about 10 to about 50% by volume and a failure value of at least 8 MPa.
Claim 5
Dependent Claim
18 words
The dental attachment of claim 1 or 3 wherein the particulate material has a diameter of -100 mesh.
Claim 6
Dependent Claim
12 words
The dental attachment of claim 4 wherein said particulate material is spherical.
Claim 7
Dependent Claim
34 words
The dental attachment of claim 1 wherein said tooth engaging surface is constructed of metal, said particulate material is constructed of ceramic material and said ceramic material is adhesively bonded to said metal surface.
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) | 1993-05-21 | 1993-11-20 | 1994-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-21 | 1997-11-20 | 1998-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-21 | 2001-11-20 | 2002-05-22 | $7700.00 | Window Closed / Lapsed |