Patent US3244241A successfully refreshed from Google Patents.
US3244241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power hammer
Assignee: Individual
•
Filing: 1963-03-11
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Granted: 1966-04-05
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Expires: 1983-03-11
Abstract
No abstract record available.
Inventors
- 👤 Ferwerda Ray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:33
CPC Classifications
B; B25; B25D; B25D11/00; B25D11/06; B25D11/10; B25D16/00; E; E01; E01C; E01C23/00; E01C23/06; E01C23/12; E01C23/122; E01C23/124; E02; E02D; E02D3/00; E02D3/02; E02D3/046; E02D7/00; E02D7/02; E02D7/06; E02D7/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
141 words
A BLOW DELIVERING DEVICE COMPRISING A HOUSING; A TOOL-CARRYING MEMBER HAVING A SHAFT EXTENDING INTO SAID HOUSING AT ONE END THEREOF; SAID SHAFT HAVING A BLOW RECEIVING ANVIL PORTION DISPOSED WITHIN SAID HOUSING; A HAMME%R RECIPROCATABLY MOUNTED IN SAID HOUSING FOR A STROKE MOVEMENT IN LINE WITH SAID SHAFT TOWARDD AND AWAY FROM SAID ANVIL PORTION; SAID HAMMER HAVING AN ELONGATED EXTENSION COAXIAL WITH SAID SHAFT AND EXTENDING FURTHER INTO SAID HOUSING AWAY FROM SAID HAMMER AND OUT THROUGH THE END OF SAID HOUSING OPPOSITE SAID ONE END; A HELICAL SPRING MEANS SURROUNDING SAID EXTENSION AND DISPOSED BETWEEN SAID HAMMER AND SAID OPPOSITE HOUSING END; POWER MEANS CARRIED BY SAID HOUSING INCLUDING MEANS REPEATEDLY RETRACTING SAID EXTENSION AND SAID HAMMER AGAINST THE BIAS OF SAID SPRING MEANS AND THEN SUDDENLY RELEASING THEM, IN USE OF SAID DEVICE, THEREBY PERMITTING SAID SPRING
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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) | 1969-04-04 | 1969-10-04 | 1970-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-04 | 1973-10-04 | 1974-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-04 | 1977-10-04 | 1978-04-05 | $7700.00 | Window Closed / Lapsed |