US3098299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling instrument
Assignee: Individual
•
Filing: 1957-08-12
•
Granted: 1963-07-23
•
Expires: 1977-08-12
Abstract
No abstract record available.
Inventors
- 👤 Richard W Page
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:03
CPC Classifications
A; A61; A61C; A61C1/00; A61C1/08; A61C1/14; Y; Y10; Y10S; Y10S279/00; Y10S279/906; Y10T; Y10T279/00; Y10T279/17; Y10T279/17957
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
A DENTAL DRILLING INSTRUMENT COMPRISING A CASING STRUCTURE A TUBULAR SHAFT HAVING ONE END ADAPTED TO RECEIVE A DRILL SHANK, BEARING SUPPORTED IN THE CASING STRUCTURE AND, IN TURN, ROTATABLY SUPPORTING THE TUBULAR SHAFT, AND CLOSURE MEANS AROUND THE DRILL SHANK RECEIVING END OF THE SHAFT, THE SAID CLOSURE MEANS COMPRISING A WASHER PLATE SUPPORTED IN THE CASING STRUCTURE ADJACENT THE BEARINGS AND CLOSELY FITTING AROUND THE SAID SHAFT, MEANS DEFINING A GREASE CHAMBER ADJACENT THE SAID WASHER PLATE AND OUTWARDLY THEREOF, MEANS OUTWARDLY OF THE GREASE CHAMBER DEFINING AN AIR CHAMBER AND INCLUDING AN OUTER CLOSURE MEMBER FOR THE AIR CHAMBER FITTING AROUND THE SHAFT WITH CLEARANCE, AND MEANS FOR SUPPORTING AIR UNDER PRESSURE TO THE AIR CHAMBER FOR MAINTAINING A CURRENT OF AIR OUT THROUGH THE SPACE BETWEEN THE LAST SAID MEMBER AND THE TUBULAR SHAFT DURING OPERATION OF THE DRILL AND THEREBY PREVENTING THE ENTRY INTO THE CASING OF WATER AND GRITTY MATERIAL.
Claim 2
Dependent Claim
156 words
A DENTAL DRILLING INSTRUMENT COMPRISING A CASING STRUCTURE A TUBULAR SHAFT HAVING ONE END ADAPTED TO RECEIVE A DRILL SHANK, BEARING SUPPORTED IN THE CASING STRUCTURE AND, IN TURN, ROTATABLY SUPPORTING THE TUBULAR SHAFT, AND CLOSURE MEANS AROUND THE DRILL SHANK RECEIVING END OF THE SHAFT, THE SAID CLOSURE MEANS COMPRISING A WASHER PLATE SUPPORTED IN THE CASING STRUCTURE ADJACENT THE BEARINGS AND CLOSELY FITTING AROUND THE SAID SHAFT, MEANS DEFINING A GREASE CHAMBER ADJACENT THE SAID WASHER PLATE AND OUTWARDLY THEREOF, MEANS OUTWARDLY OF THE GREASE CHAMBER DEFINING AN AIR CHAMBER AND INCLUDING AN OUTER CLOSURE MEMBER FOR THE AIR CHAMBER FITTING AROUND THE SHAFT WITH CLEARANCE, AND MEANS FOR SUPPORTING AIR UNDER PRESSURE TO THE AIR CHAMBER FOR MAINTAINING A CURRENT OF AIR OUT THROUGH THE SPACE BETWEEN THE LAST SAID MEMBER AND THE TUBULAR SHAFT DURING OPERATION OF THE DRILL AND THEREBY PREVENTING THE ENTRY INTO THE CASING OF WATER AND GRITTY MATERIAL.
References Cited (Backward Citations)
GB391437A
Cited
US2180993A
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US2611960A
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US2608807A
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DE842241C
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US2701914A
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US2824370A
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US2917829A
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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) | 1966-07-22 | 1967-01-21 | 1967-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-07-22 | 1971-01-21 | 1971-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-07-22 | 1975-01-21 | 1975-07-23 | $7700.00 | Window Closed / Lapsed |