Patent US3334693A successfully refreshed from Google Patents.
US3334693A
Expired / Lapsed
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Power-operated percussive tools
Assignee: PRECIS (188) Ltd
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Filing: 1964-10-19
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Granted: 1967-08-08
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Expires: 1984-10-19
Abstract
No abstract record available.
Inventors
- 👤 Badcock David Norman William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:33
CPC Classifications
B; B25; B25D; B25D11/00; B25D11/005; B25D11/06; B25D11/12; B25D11/125; B25D17/00; B25D17/06; B25D17/08; B25D17/084; B25D2250/00; B25D2250/191
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
122 words
A POWER-OPERATED PERCUSSIVE TOOL COMPRISING A CASING, A TELESCOPICALLY-ENGAGED, RELATIVELY RECIPROCATABLE CYLINDRICAL DRIVER AND STRIKER WITHIN SAID CASING AND FORMING AN AIR CHAMBER THEREBETWEEN, MEANS IN SAID STRIKER FOR MOMENTARY VENTING SAID AIR CHAMBER TO ALLOW AIR TRAPPED THEREIN TO ADJUST TO A SUBSTANTIALLY CONSTANT WORKING LEVEL DURING NORMAL OPERATION OF THE TOOL AND ALSO EFFECTIVELY TO IMMOBILIZE THE STRIKER WHEN THIS MOVES APPRECIABLY BEYOND ITS NORMAL BLOW-STRIKING POSITION, AN ELECTRIC MOTOR MOUNTED ON ONE END OF SAID CASING, TOOL ROTATING MECHANISM SUPPORTED ON THE OTHER END OF SAID CASING, DRIVE MEANS ON SAID CASING DRIVEN BY SAID MOTOR FOR EFFECTING RELATIVE RECIPOCATORY MOVEMENT BETWEEN SAID DRIVER AND STRIKER AND A TOOL ROTATION DRIVE SHAFT EXTENDING PARALLEL TO THE LONGITUDINAL DRIVER-STRIKER AXIS.
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) | 1970-08-07 | 1971-02-06 | 1971-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-07 | 1975-02-06 | 1975-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-07 | 1979-02-06 | 1979-08-08 | $7700.00 | Window Closed / Lapsed |