US4214356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Artificial porcelain tooth manufacturing
Assignee: Sansha Electric Manufacturing Co Ltd
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Filing: 1978-02-02
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Granted: 1980-07-29
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Expires: 1998-02-02
Abstract
Abstract The method and apparatus for manufacturing an artificial tooth crown which involves the formation of a metal crown, coating the crown with porcelain materials and subjecting the coated crown to high frequency vibrations of the order of 15 to 50 Hz to condense the porcelain materials and remove air and liquid therefrom prior to firing.
Inventors
- 👤 Susumu Takenaka
- 👤 Hideo Ishii
- 👤 Masao Katooka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:46
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/0003; A61C5/00; A61C5/70; A61C5/77; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49567; Y10T29/4998; Y10T29/49982; Y10T29/49986; Y10T29/49988
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
100 words
The method of manufacturing an artificial porcelain coated metal dental crown comprising the steps of forming a metal crown by casting, drawing and the like, applying an opaque layer to at least a portion of the metal crown to shield the color of the metal, applying at least one layer of a slurry containing porcelain materials in overlying relationship to coat said opaque layer, vibrating said metal crown with said layers thereon at an ultrasonic frequency to condense said porcelain materials and expel air and liquid therefrom and then firing the coated metal crown to form the completed dental crown.
Claim 2
Independent Claim
100 words
The method of manufacturing an artificial porcelain coated metal dental crown comprising the steps of forming a metal crown by casting, drawing and the like, applying an opaque layer to at least a portion of the metal crown to shield the color of the metal, applying at least one layer of a slurry containing porcelain materials in overlying relationship to coat said opaque layer, vibrating said metal crown with said layers thereon at an ultrasonic frequency to condense said porcelain materials and expel air and liquid therefrom and then firing the coated metal crown to form the completed dental crown.
Claim 3
Dependent Claim
31 words
The method of manufacturing an artificial porcelain coated metal dental crown according to claim 1 wherein the frequency of said ultra-sonic vibration is in the range of 15 to 50 KHz.
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) | 1983-07-29 | 1984-01-28 | 1984-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-29 | 1988-01-28 | 1988-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-29 | 1992-01-28 | 1992-07-29 | $7700.00 | Window Closed / Lapsed |