US4814008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental material
Assignee: Individual
•
Filing: 1985-04-15
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Granted: 1989-03-21
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Expires: 2005-04-15
Abstract
Abstract A dental material of a metal composition for reinforcing the metal framework of a dental restoration comprising an aggregate combination of metal particles including a first high fusing temperature precious metal component and a second low fusing temperature precious metal component. The particles of the first component are in a proportion of 1-15% by volume of the total composition and have a particle size at least about five times larger than the particle size of the second component.
Inventors
- 👤 Itzhak Shoher
- 👤 Aharon E. Whiteman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:56
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/0003; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/844; B; B22; B22F; B22F1/00; B22F1/09; C; C22; C22C; C22C5/00; C22C5/02; C22C5/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
111 words
A dental material for reinforcing the metal framework of a dental restoration comprising an aggregate combination of metal particles which are adapted to be subjected to heat treatment in a predetermined temperature range, said metal particles including a first high fusing temperature precious metal component having a melting point above said heat treatment temperature and a second low fusing temperature precious metal component adapted to substantially melt during said heat treatment and with the particles of said fist component being in a proportion of from 1-15% by volume of the total composition and having a particle size at least about five times larger than the particle size of the second component.
Claim 2
Dependent Claim
111 words
A dental material for reinforcing the metal framework of a dental restoration comprising an aggregate combination of metal particles which are adapted to be subjected to heat treatment in a predetermined temperature range, said metal particles including a first high fusing temperature precious metal component having a melting point above said heat treatment temperature and a second low fusing temperature precious metal component adapted to substantially melt during said heat treatment and with the particles of said fist component being in a proportion of from 1-15% by volume of the total composition and having a particle size at least about five times larger than the particle size of the second component.
Claim 3
Dependent Claim
21 words
A dental material as defined in claim 1 wherein said low fusing temperature component is composed of up to 100% gold.
Claim 4
Dependent Claim
23 words
A dental material as defined in claim 2 wherein said high fusing temperature component is selected from the group comprising platinum and palladium.
Claim 5
Dependent Claim
26 words
A dental material as defined in claim 1 wherein the particle size of said low fusing temperature component is in a range of about 20-30 microns.
Claim 6
Dependent Claim
26 words
A dental material as defined in claim 1 wherein said low fusing temperature component comprises a composition of a first and second metal or metal alloy.
Claim 7
Dependent Claim
32 words
A dental material as defined in claim 5 wherein said first metal forms an alloy with said second metal during heat treatment having a hardness above the hardness of said first metal.
Claim 8
Dependent Claim
28 words
A dental material as defined in claim 6 wherein said first and second metals are precious metals with said first metal being composed of up to 100% gold.
Claim 9
Dependent Claim
26 words
A dental material as defined in claim 7 wherein said second precious metal is selected from the group comprising platinum and palladium in combination with gold.
Claim 10
Dependent Claim
25 words
A dental material as defined in claim 8 wherein the composition of said second precious metal comprises between about 0-20% Pt, 0-20% Pd, remainder gold.
Claim 11
Dependent Claim
16 words
A dental material as defined in claim 9 further comprising a minor addition of silver chloride.
Claim 12
Dependent Claim
17 words
A dental material as defined in claim 3 wherein said high fusing component has an irregular shape.
Claim 13
Dependent Claim
42 words
A dental material as defined in claim 11 wherein said first and second components are cladded to one another forming cladded particles, with the proportion of high fusing to low fusing being based on the differences in thickness between the cladded metals.
References Cited (Backward Citations)
US324650A
Cited
US3502466A
Cited
US3834024A
Cited
US4273580A
Cited
US4295941A
Cited
US4461618A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-20 | 1992-09-19 | 1993-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-20 | 1996-09-19 | 1997-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-20 | 2000-09-19 | 2001-03-21 | $7700.00 | Window Closed / Lapsed |