Patent US2719363A successfully refreshed from Google Patents.
US4595598A
Expired / Lapsed
US
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Crystalline alumina composites
Assignee: Ormco Corp
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Filing: 1984-04-23
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Granted: 1986-06-17
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Expires: 2004-04-23
Abstract
Abstract The adhesion of crystalline alumina to adhesives is enhanced by coating the surface of the alumina that is to be in contact with the adhesive, with a very thin coating of a siliceous material such as sputter coated silica.
Inventors
- 👤 Robert D. De Luca
- 👤 Robin M. Forbes-Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:00
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/45; C04B41/50; C04B41/5025; A; A61; A61C; A61C7/00; A61C7/12; A61C7/14; C04B41/80; C04B41/81; C04B41/85; C04B41/87
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
60 words
A composite comprising a crystalline alumina article adhesively bonded to a substrate, wherein at least a portion of the surface of said article that is adhesively bonded to said substrate comprises crystalline alumina having a thin adherent coating of a siliceous material, wherein said siliceous material consists essentially of silica or a glass containing at least 50 mol percent silica.
Claim 2
Dependent Claim
60 words
A composite comprising a crystalline alumina article adhesively bonded to a substrate, wherein at least a portion of the surface of said article that is adhesively bonded to said substrate comprises crystalline alumina having a thin adherent coating of a siliceous material, wherein said siliceous material consists essentially of silica or a glass containing at least 50 mol percent silica.
Claim 3
Dependent Claim
32 words
The composite of claim 1 wherein the adhesive bond between said coating of a siliceous material and the adhesive bonding said article to said substrate is enhanced by a silane coupling agent.
Claim 4
Dependent Claim
14 words
The composite of claim 1 or 2 wherein said crystalline alumina is crystalline alpha-alumina.
Claim 5
Dependent Claim
13 words
The composite of claim 1 or 2 wherein said siliceous material is silica.
Claim 6
Dependent Claim
11 words
The composite of claim 3 wherein said siliceous material is silica.
Claim 7
Dependent Claim
41 words
The composite of claim 1 or 2 wherein said article is an orthodontic bracket comprising a base member including a tooth contacting surface and a body member extending from said base member, said body member including walls defining an archwire groove.
Claim 8
Dependent Claim
39 words
The composite of claim 3 wherein said article is an orthodontic bracket comprising a base member including a tooth contacting surface and a body member extending from said base member, said body member including walls defining an archwire groove.
Claim 9
Dependent Claim
39 words
The composite of claim 2 wherein said article is an orthodontic bracket comprising a base member including a tooth contacting surface and a body member extending from said base member, said body member including walls defining an archwire groove.
Claim 10
Dependent Claim
12 words
The composite of claim 8 wherein said composite comprises an orthodontic bracket.
Claim 11
Dependent Claim
21 words
The composite of claim 2 wherein the adhesive is an epoxy resin and the silane coupling agent contains an amino group.
Claim 12
Independent Claim
65 words
A method of producing a composite which comprises the steps of coating at least a portion of the surface of a crystalline alumina article with a thin adherent coating of a siliceous material, and then bonding said article to a substrate by adhesively bonding said surface having the siliceous coating to the substrate using an adhesive that has an adhesive affinity for said siliceous coating.
Claim 13
Independent Claim
65 words
A method of producing a composite which comprises the steps of coating at least a portion of the surface of a crystalline alumina article with a thin adherent coating of a siliceous material, and then bonding said article to a substrate by adhesively bonding said surface having the siliceous coating to the substrate using an adhesive that has an adhesive affinity for said siliceous coating.
Claim 14
Dependent Claim
11 words
The method of claim 11 wherein said siliceous material is silica.
Claim 15
Dependent Claim
14 words
The method of claim 11 or 12 wherein the crystalline alumina is crystalline alpha-alumina.
Claim 16
Dependent Claim
28 words
The method of claim 11 or 12 wherein the adhesive bond between said adhesive and said siliceous coating is enhanced by the use of a silane coupling agent.
Claim 17
Dependent Claim
20 words
The method of claim 14 wherein the adhesive is an acrylic material and the silane coupling agent contains ethylenic unsaturation.
Claim 18
Dependent Claim
41 words
The method of claim 11 or 12 wherein said article is an orthodontic bracket comprising a base member including a tooth contacting surface and a body member extending from said base member, said body member including walls defining an archwire groove.
Claim 19
Dependent Claim
39 words
The method of claim 13 wherein said article is an orthodontic bracket comprising a base member including a tooth contacting surface and a body member extending from said base member, said body member including walls defining an archwire groove.
Claim 20
Dependent Claim
39 words
The method of claim 14 wherein said article is an orthodontic bracket comprising a base member including a tooth contacting surface and a body member extending from said base member, said body member including walls defining an archwire groove.
Claim 21
Dependent Claim
39 words
The method of claim 15 wherein said article is an orthodontic bracket comprising a base member including a tooth contacting surface and a body member extending from said base member, said body member including walls defining an archwire groove.
References Cited (Backward Citations)
US3625740A
Cited
US3764507A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-16 | 1989-12-16 | 1990-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-16 | 1993-12-16 | 1994-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-16 | 1997-12-16 | 1998-06-17 | $7700.00 | Window Closed / Lapsed |