US3421224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air turbine drive cartridge for dental drill
Assignee: MPB Corp
•
Filing: 1964-09-10
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Granted: 1969-01-14
•
Expires: 1984-09-10
Abstract
No abstract record available.
Inventors
- 👤 Paul Donald Brehm
- 👤 Raymond H Carter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:20
CPC Classifications
A; A61; A61C; A61C1/00; A61C1/02; A61C1/05; F; F16; F16C; F16C35/00; F16C35/04; F16C35/042; F16C19/00; F16C19/54; F16C2208/00; F16C2208/20; F16C2208/66; F16C2316/00; F16C2316/10; F16C2316/13; F16C27/00; F16C27/06; F16C27/066; F16C33/00; F16C33/30; F16C33/38; F16C33/41; F16C33/412; F16C33/414; F16C33/416
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
IN A TURBINE DRIVE CARTRIDGE ADAPTED FOR INSERTION INTO A DENTAL TOOL HANDLE HOUSING FOR HOLDING THE CARTRIDGE AND FOR ROTATING A TOOL ATTACHED TO THE CARTRIDGE AT SPEEDS IN EXCESS OF 375,000 R.P.M., THE IMPROVEMENT COMPRISING (A) A HARD SMOOTH SURFACE PLASTIC CARTRIDGE HOUSING ADAPTED TO BE POSITIONED IN FIXED RELATION WITHIN SAID HANDLE HOUSING AND HAVING AN INLET PORT IN COMMUNICATION WITH A SOURCE OF AIR UNDER PRESSURE AND AN OUTLET PORT IN COMMUNICATION WITH THE ATMOSPHERE; (B) A HARD AND SMOOTH SURFACE PLASTIC TURBINE SHAFT HAVING A LOW MOMENT OF INERTIA ROTATABLY MOUNTED IN SAID CARTRIDGE HOUSING AND HAVING A PLURALITY OF IN SAID CARTRIDGE HOUSING AND HAVING A PLURALITY OF ING RADIALLY OUTWARDLY FROM THE INTERMEDIATE PORTION THEREOF;
Claim 2
Dependent Claim
122 words
IN A TURBINE DRIVE CARTRIDGE ADAPTED FOR INSERTION INTO A DENTAL TOOL HANDLE HOUSING FOR HOLDING THE CARTRIDGE AND FOR ROTATING A TOOL ATTACHED TO THE CARTRIDGE AT SPEEDS IN EXCESS OF 375,000 R.P.M., THE IMPROVEMENT COMPRISING (A) A HARD SMOOTH SURFACE PLASTIC CARTRIDGE HOUSING ADAPTED TO BE POSITIONED IN FIXED RELATION WITHIN SAID HANDLE HOUSING AND HAVING AN INLET PORT IN COMMUNICATION WITH A SOURCE OF AIR UNDER PRESSURE AND AN OUTLET PORT IN COMMUNICATION WITH THE ATMOSPHERE; (B) A HARD AND SMOOTH SURFACE PLASTIC TURBINE SHAFT HAVING A LOW MOMENT OF INERTIA ROTATABLY MOUNTED IN SAID CARTRIDGE HOUSING AND HAVING A PLURALITY OF IN SAID CARTRIDGE HOUSING AND HAVING A PLURALITY OF ING RADIALLY OUTWARDLY FROM THE INTERMEDIATE PORTION THEREOF;
References Cited (Backward Citations)
US2764009A
Cited
US2791182A
Cited
US2945299A
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US2897596A
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US3039397A
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US2983519A
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US3046585A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |