US3621576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semibaked porcelain teeth
Assignee: CAPA IDUSTRIES Inc A DE CORP
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Filing: 1970-03-17
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Granted: 1971-11-23
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Expires: 1990-03-17
Abstract
Abstract A PROCESS FOR FABRICATING A DENTAL APPLIANCE OR TOOTH STRUCTURE IN WHICH A PROCELAIN MIXTURE IS INITIALLY SHAPED AND FIRED TO A TEMPERATURE BELOW THE VITRIFICATION POINT. THOSE SURFACES WHICH ARE TO BE WORKED AND MODIFIED SUBSEQUENTLY TO FIT THE APPLIANCE TO A PARTICULAR CASE, ARE THEN COATED WITH REFRACTORY MATERIAL. AFTER HEATING THE STRUCTURE TO THE VITRIFICATION POINT, THE COVERED SURFACES ARE WORKED AND SHAPED TO PARTICULAR REQUIREMENTS, AND THE RESULTING MASS IS REHEATED TO THE VITRIFICATION POINT TO RENDER A HOMOGENEOUSLY FUSED STRUCTURE WITH FINISHED SURFACES.
Inventors
- 👤 Rafael Gnecco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:09
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/08; A61C13/083
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |