Patent US4997723A successfully refreshed from Google Patents.
US4997723A
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US
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Metal-porcelain dental restorations, dental veneers, dental bridges and metal foil for use therein and methods for making dental appliances
Assignee: Tanaka Dental Enterprises
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Filing: 1990-02-14
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Granted: 1991-03-05
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Expires: 2010-02-14
Abstract
Abstract A metal foil is provided for use in a metal-porcelain dental restoration, which metal foil provides improved color qualities to the finished restoration and improved bonding of the metal to the porcelain. The metal foil is made of an alloy comprising a major amount of gold, an amount of platinum or palladium, and an amount of a non-precious metal. An improved dental veneer and dental bridge can also be made using the metal foil of the invention.
Inventors
- 👤 Asami Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:47
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/08; A61C13/082; A61C13/225; A61C13/26; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/844; C; C22; C22C; C22C5/00; C22C5/02; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12431
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
62 words
A foil for use in a dental application, said foil comprising a three-component alloy consisting of a total of about 2-5 wt % of a color-adjusting metal from the group consisting of platinum, palladium, and silver; a total of about 0.1-5 wt % of a non-precious metal from the group consisting of indium, iron, zinc, aluminum, and copper; and the balance gold.
Claim 2
Dependent Claim
62 words
A foil for use in a dental application, said foil comprising a three-component alloy consisting of a total of about 2-5 wt % of a color-adjusting metal from the group consisting of platinum, palladium, and silver; a total of about 0.1-5 wt % of a non-precious metal from the group consisting of indium, iron, zinc, aluminum, and copper; and the balance gold.
Claim 3
Dependent Claim
17 words
The foil of claim 1 wherein said non-precious metal comprises about 0.25-1 wt % of said foil.
Claim 4
Dependent Claim
17 words
The foil of claim 2 wherein said non-precious metal comprises about 0.25-0.5 wt % of said foil.
Claim 5
Dependent Claim
17 words
The foil of claim 3 wherein said non-precious metal comprises about 0.25 wt % of said foil.
Claim 6
Dependent Claim
11 words
The foil of claim 1 wherein said non-precious metal is indium.
Claim 7
Dependent Claim
17 words
The foil of claim 1 wherein said color-adjusting metal comprises about 3 wt % of said foil.
Claim 8
Dependent Claim
11 words
The foil of claim 1 wherein said color-adjusting metal is platinum.
Claim 9
Dependent Claim
11 words
The foil of claim 7 wherein said non-precious metal is indium.
Claim 10
Dependent Claim
27 words
The foil of claim 8 wherein said platinum comprises about 3 wt % of said foil and said indium comprises about 0.25 wt % of said foil.
Claim 11
Dependent Claim
36 words
A metal-porcelain dental restoration comprising: (a) an interior substructure of a thin metal foil of claim 1 having a textured exterior surface, and (b) a body porcelain layer bonded directly to the exterior of said substructure.
Claim 12
Dependent Claim
27 words
A metal-porcelain dental veneer comprising: (a) a thin metal foil of claim 1 for bonding to the tooth, and (b) a porcelain layer bonded to said foil.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-03-04 | 1994-09-03 | 1995-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-04 | 1998-09-03 | 1999-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-04 | 2002-09-03 | 2003-03-05 | $7700.00 | Window Closed / Lapsed |