US3209457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual controller for dental drills
Assignee: Ritter Co Inc
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Filing: 1960-05-23
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Granted: 1965-10-05
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Expires: 1980-05-23
Abstract
No abstract record available.
Inventors
- 👤 Billin Arthur Gilbert
- 👤 Tyler C Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:57
CPC Classifications
A; A61; A61C; A61C1/00; A61C1/0007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
IN COMBINATION, A DENTAL UNIT, A FIRST DENTAL HANDPIECE, AND A SECOND DENTAL HANDPIECE OPERATIVELY CONNECTED TO AND MOUNTED ON SAID DENTAL UNIT, A DENTAL ENGINE BEING EFFECTIVE TO CONTROL THE OPERATION OF SAID FIRST DENTAL HANDPIECE, A TURBINE MOUNTED IN SAID SECOND HANDPIECE, A FIRST ELECTRICAL CIRCUIT INCLUDING A RHEOSTAT BEING ADAPTED TO CONTROL SAID DENTAL ENGINE; A PRESSURE REGULATOR FOR CONTROLLING THE PRESSURE OF AIR DELIVERED TO SAID TURBINE; A SECOND ELECTRICAL CIRCUIT BEING ADAPTED TO CONTROL THE PASSAGE OF AIR UNDER PRESSURE TO SAID PRESSURE REGULATOR; A LEVER HAVING A NEUTRAL POSITION ADAPTED TO CONTROL SAID RHEOSTAT OR SAID PRESSURE REGULATOR WHEN NOT IN NEUTRAL POSITION; AUTOMATIC SWITCH MEANS WHEREBY ONE OF SAID ELECTRICAL CIRCUITS IS NORMALLY ENERGIZED, SAID SWITCH MEANS BEING EFFECTIVE TO ENERGIZE THE ELECTRICAL CIRCUIT WHICH WILL RENDER SAID LEVER EFFECTIVE TO CONTROL THE DENTAL HANDPIECE WHICH IS WITHDRAWN FROM SAID DENTAL UNIT.
Claim 2
Dependent Claim
149 words
IN COMBINATION, A DENTAL UNIT, A FIRST DENTAL HANDPIECE, AND A SECOND DENTAL HANDPIECE OPERATIVELY CONNECTED TO AND MOUNTED ON SAID DENTAL UNIT, A DENTAL ENGINE BEING EFFECTIVE TO CONTROL THE OPERATION OF SAID FIRST DENTAL HANDPIECE, A TURBINE MOUNTED IN SAID SECOND HANDPIECE, A FIRST ELECTRICAL CIRCUIT INCLUDING A RHEOSTAT BEING ADAPTED TO CONTROL SAID DENTAL ENGINE; A PRESSURE REGULATOR FOR CONTROLLING THE PRESSURE OF AIR DELIVERED TO SAID TURBINE; A SECOND ELECTRICAL CIRCUIT BEING ADAPTED TO CONTROL THE PASSAGE OF AIR UNDER PRESSURE TO SAID PRESSURE REGULATOR; A LEVER HAVING A NEUTRAL POSITION ADAPTED TO CONTROL SAID RHEOSTAT OR SAID PRESSURE REGULATOR WHEN NOT IN NEUTRAL POSITION; AUTOMATIC SWITCH MEANS WHEREBY ONE OF SAID ELECTRICAL CIRCUITS IS NORMALLY ENERGIZED, SAID SWITCH MEANS BEING EFFECTIVE TO ENERGIZE THE ELECTRICAL CIRCUIT WHICH WILL RENDER SAID LEVER EFFECTIVE TO CONTROL THE DENTAL HANDPIECE WHICH IS WITHDRAWN FROM SAID DENTAL UNIT.
References Cited (Backward Citations)
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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) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |