US4064311A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of metal-ceramic articles
Assignee: National Research Development Corp UK
•
Filing: 1975-07-09
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Granted: 1977-12-20
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Expires: 1995-07-09
Abstract
Abstract A process for the production of a metal-ceramic article which comprises firing porcelain on to a metal substrate, the metal substrate having deposited thereon an adherent layer of a metal oxide which is wetted by the porcelain in the fused state.
Inventors
- 👤 John Walford McLean
- 👤 Ian Robert Sced
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:20
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/28; A61L27/30; A61L27/306; A61C; A61C13/00; A61C13/08; A61C13/083; A61C13/0835; A61K; A61K6/00; A61K6/20; A61K6/80; A61K6/802; A61K6/824; A61K6/84; A61K6/844; C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; Y; Y10; Y10S; Y10S205/00; Y10S205/917; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12708; Y10T428/12715; Y10T428/12722
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
56 words
A process for the production of a metal-ceramic dental restoration, whih comprises fitting porcelain on to a metal substrate selected from the group consisting of the noble metals and alloys thereof, the metal substrate having deposited thereon an adherent layer of a chemically uncombined metal oxide which is wetted by the porcelain in the fused state.
Claim 2
Dependent Claim
56 words
A process for the production of a metal-ceramic dental restoration, whih comprises fitting porcelain on to a metal substrate selected from the group consisting of the noble metals and alloys thereof, the metal substrate having deposited thereon an adherent layer of a chemically uncombined metal oxide which is wetted by the porcelain in the fused state.
Claim 3
Dependent Claim
15 words
A process according to claim 1, in which the porcelain is a dental aluminous porcelain.
Claim 4
Dependent Claim
16 words
A process according to claim 1, in which the metal substrate is a platinum metal substrate.
Claim 5
Dependent Claim
26 words
A process according to claim 1, in which the metal oxide is an oxide of a metal having an atomic number of from 26 to 50.
Claim 6
Dependent Claim
18 words
A process according to claim 1, in which the metal oxide is an oxide of tin or indium.
Claim 7
Dependent Claim
33 words
A process according to claim 1, in which the substrate is heated in a vacuum after deposition of the metal layer in order to promote diffusion of deposited metal atoms into the substrate.
Claim 8
Dependent Claim
23 words
A process according to claim 1, in which the deposited metal layer is converted to the oxide by heating in air or oxygen.
Claim 9
Dependent Claim
23 words
A process according to claim 1 in which the substrate is a platinum metal foil of thickness from 0.001 inch to 0.005. inch.
Claim 10
Dependent Claim
28 words
A process according to claim 1, in which the porcelain is fired on to the metal substrate using a firing temperature of from 800° C to 1100° C.
Claim 11
Dependent Claim
34 words
A process according to claim 1, in which the substrate is heated under an inert atmosphere after deposition of the metal layer in order to promote diffusion of deposited metal atoms into the substrate.
Claim 12
Dependent Claim
32 words
A process according to claim 1, in which the metal oxide layer is produced by depositing a metal layer on the substrate and then oxidising this layer to produce the metal oxide.
Claim 13
Dependent Claim
15 words
A process according to claim 6, in which the metal layer is deposited by electrodeposition.
Claim 14
Dependent Claim
21 words
A process according to claim 6, in which the deposited metal layer has a thickness of from 0.2 to 2.00 microns.
Claim 15
Dependent Claim
12 words
A metal-ceramic dental restoration produced by practicing the process of claim 1.
Claim 16
Dependent Claim
22 words
A metal-ceramic article according to claim 14, which comprises a platinum metal substrate having a tightly adherent layer of porcelain fired thereto.
References Cited (Backward Citations)
US1195090A
Cited
US1659757A
Cited
US2399094A
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US2421719A
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US3052983A
Cited
US2980998A
Cited
US2975078A
Cited
US3222266A
Cited
US3481772A
Cited
US3422535A
Cited
US4004057A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-19 | 1981-06-20 | 1981-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-19 | 1985-06-20 | 1985-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-19 | 1989-06-20 | 1989-12-20 | $7700.00 | Window Closed / Lapsed |