US3581398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental keying device
Assignee: Thomas Technadent Products Inc
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Filing: 1968-12-09
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Granted: 1971-06-01
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Expires: 1988-12-09
Abstract
Abstract A DENTAL MODEL IS CAST ON AN ARCH-SHAPED RIDGE THAT HAS A KEY EXTENDING BEYOND THE BASE OF THE MODEL. THE KEY HAS VERTICAL CORRUGATED WALLS THAT FIT CLOSELY INTO A MATRIX SO THAT THE KEWED MODEL CAN BE CUT UP AND ITS PARTS INSERTED AND REMOVED FROM THE MATRIX. THE MATRIX IS EITHER MADE TO FIT THE KEY OR CAST ONTO THE KEY.
Inventors
- 👤 John M Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:37
CPC Classifications
A; A61; A61C; A61C9/00; A61C9/002
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |