US3203489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sinker drill
Assignee: Thor Power Tool Co
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Filing: 1963-07-18
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Granted: 1965-08-31
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Expires: 1983-07-18
Abstract
No abstract record available.
Inventors
- 👤 George H Fuehrer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:14
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/087
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
162 words
A PNEUMATICALLY ACTUATED SINKER DRILL HAVING A MAIN BODY, AN EXTENDIBLE FEED LEG PIVOTALLY CONNECTED WITH SAID MAIN BODY WITH ITS AXIS NORMALLY DISPOSED AT AN ACUTE ANGLE TO THE AXIS OF SAID SINKER DRILL AND INCLUDING AIR PASSAGE MEANS FOR SUPPLYING PRESSURIZED AIR THERETO AND FOR RELEASING SUCH AIR THEREFROM, A BACKHEAD ASSEMBLY SECURED TO THE REAR END OF SAID MAIN BODY INCLUDING A RIGID HANDGRIP AND A MASTER AIR CONTROL VALVE ADJACENT THERETO, SAID MASTER VALVE HAVING MEANS FOR CUTTING ON AND OFF THE FLOW OF PRESSURIZED AIR TO SAID FEED LEG AIR PASSAGE MEANS, CONTROL VALVE MEANS MOUNTED ON SAID HANDGRIP FOR REGULATING THE VENTING OF PRESSURIZED AIR ENROUTE TO SAID FEED LEG AND EFFECTIVE TO CONTROL THE EXTENSION OF SAID LEG IN ACCORDANCE WITH OPERATING NEEDS, AND FAST ACTION AIR DUMPING MEANS HAVING AN ACTUATING CONTROL AT SAID HANDGRIP AND OPERABLY TO DISCONTINUE AIR FLOW TO SAID LEG ABRUPTLY INDEPENDENTLY OF THE POSITION OF SAID CONTROL VALVE MEANS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-30 | 1969-03-01 | 1969-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-30 | 1973-03-01 | 1973-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-30 | 1977-03-01 | 1977-08-31 | $7700.00 | Window Closed / Lapsed |