Patent US4125442A successfully refreshed from Google Patents.
US4125442A
Expired / Lapsed
US
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Artificial teeth construction
Assignee: Individual
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Filing: 1976-09-10
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Granted: 1978-11-14
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Expires: 1996-09-10
Abstract
Abstract Composite metal/porcelain tooth reconstructions are manufactured by bonding porcelain to a basis metal which is pretreated by electrolytically depositing thereon a thin layer of a different metal. The pretreatment has the effect of increasing the bond strength between the metal and the porcelain. If the basis metal is a noble metal, the different metal may be deposited directly, and the porcelain then bonded on. If the basis metal is a base metal the pretreatment preferably includes an etching step, deposition of a preliminary metal layer on the etched surface, followed by deposition of the main metal layer, followed by a final deposition of metal prior to bonding to the porcelain.
Inventors
- 👤 Olbert W. Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:48
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/08; A61C13/083; A61C13/0835; A61C5/00; A61C5/70; A61C5/77; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/844; A61C13/0003; A61C13/0006
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
98 words
A method for use in constructing composite metal-porcelain tooth and/or bone reconstructions, the basis metal being a chromium alloy comprising the steps of pretreating the basis metal by etching, the etching being conducted anodically, followed by cathodic activation depositing a first layer of metal on said basis metal, said first layer of metal being selected from the group consisting of tin, silver, iron, zinc, copper and indium; further depositing on said first metal layer a second metal layer, said second layer of metal being selected from the group consisting of gold alloys and platinum; and bonding porcelain thereto.
Claim 2
Independent Claim
98 words
A method for use in constructing composite metal-porcelain tooth and/or bone reconstructions, the basis metal being a chromium alloy comprising the steps of pretreating the basis metal by etching, the etching being conducted anodically, followed by cathodic activation depositing a first layer of metal on said basis metal, said first layer of metal being selected from the group consisting of tin, silver, iron, zinc, copper and indium; further depositing on said first metal layer a second metal layer, said second layer of metal being selected from the group consisting of gold alloys and platinum; and bonding porcelain thereto.
Claim 3
Dependent Claim
39 words
A method according to claim 1 wherein prior to the bonding of the porcelain a third layer of metal is deposited on said second layer, said third layer being selected from iron, tin, zinc, copper, cobalt, platinum or palladium.
Claim 4
Dependent Claim
20 words
A method according to claim 1 wherein said porcelain bonded to the pretreated basis metal is a preformed porcelain facing.
Claim 5
Dependent Claim
21 words
A method according to claim 1 wherein said porcelain bonded to the pretreated basis metal is built up layer by layer.
Claim 6
Dependent Claim
30 words
A method according to claim 1 wherein said step of depositing a first layer of metal and said step of depositing a second layer of metal are both conducted electrolytically.
Claim 7
Dependent Claim
24 words
A method according to claim 1 wherein said steps of anodic etching and cathodic activation are performed in an electrolyte comprising 10%-50% sulfuric acid.
Claim 8
Dependent Claim
27 words
A method according to claim 6 wherein said step of cathodic activation is performed for 2-10 seconds at a current density of 10-200 amps per square foot.
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) | 1981-11-13 | 1982-05-15 | 1982-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-13 | 1986-05-15 | 1986-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-13 | 1990-05-15 | 1990-11-14 | $7700.00 | Window Closed / Lapsed |