Dental instrument
Abstract
Abstract THE PRESENT INVENTION RELATES TO A DENTAL INSTRUMENT FOR MIXING AND DISCHARGING AMALGAM TO BE FILLED INTO A CAVITY IN A TOOTH AND THE OBJECT OF THE INVENTION IS TO PROVIDE SUCH AN INSTRUMENT THAT CAN BE OPERATED BY THE DENTIST HIMSELF WITHOUT THE NEED OF ANY ASSISTANT. THE INSTRUMENT ACCORDING TO THE INVENTION COMPRISES TO THIS END A SCREW DRIVEN BY A MOTOR AND ROTATABLY HOUSED IN A SCREW HOUSING, THE LATTER PROVIDED WITH A DEVICE FOR INTRODUCING A SILVER ALLOY IN THE SHAPE OF A POWDER, THAT MAY BE COMPRESSED, AND MERCURY AT ONE OF ITS ENDS AND HAVING OPENINGS TO ALLOW A PRESSING OUT OF MERCURY IN EXCESS AT ITS OPPOSITE END AND IN A KNOWN, TUBE-SHAPED CHANNEL IN COMMUNICATION WITH THE DISCHARGE END OF THE SCREW HOUSING AND A MEANS DISPLACEABLE IN SAID CHANNEL FOR PRESSING OUT, IN PORTIONS, AMALGAM AT THE OPENING OF THE CHANNEL INTO THE TOOTH TO BE FILLED, SAID DISPLACEABLE MEANS ADAPTED TO CLOSE, MOMENTARILY, THE DISCHARGE END OF THE SCREW HOUSING.
Inventors
- 👤 Gunnar Ingemar Sigvard Osbeck
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |