US3358778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring driven power hammer
Assignee: Individual
•
Filing: 1965-08-19
•
Granted: 1967-12-19
•
Expires: 1985-08-19
Abstract
No abstract record available.
Inventors
- 👤 Ferwerda Ray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:46
CPC Classifications
E; E01; E01C; E01C23/00; E01C23/06; E01C23/12; E01C23/122; E01C23/124; B; B25; B25D; B25D11/00; B25D11/06; B25D11/10; E02; E02D; E02D7/00; E02D7/02; E02D7/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A PILE DRIVING AND PAVEMENT BREAKING HAMMER COMPRISING A HOUSING; A TOOL-CARRYING MEMBER HAVING A SHAFT EXTENDING INTO SAID HOUSING AT ONE END THEREOF; SAID SHAFT HAVING A BLOW RECEIVING AND TRANSMITTING ANVIL EXTENSION DISPOSED WITHIN SAID HOUSING; A HAMMER RECIPROCATABLY MOUNTED IN SAID HOUSING FOR A STROKE MOVEMENT IN LINE WITH SAID SHAFT TOWARD AND AWAY FROM SAID ANVIL EXTENSION; SAID HAMMER HAVING AN ELONGATED EXTENSION COAXIAL WITH SAID SHAFT AND EXTENDING IN SAID HOUSING AWAY FROM SAID HAMMER AND SAID ANVIL EXTENSION; A HELICAL SPRING MEANS SURROUNDING SAID HAMMER EXTENSION AND DISPOSED BETWEEN SAID HAMMER AND THE END OF SAID HOUSING OPPOSITE SAID ONE END; SAID SPRING MEANS INCLUDING AT LEAST TWO SEPARATE HELICAL SPRINGS IN END TO END RELATIONSHIP DIFFERING FROM EACH OTHER IN FREQUENCY OF
Claim 2
Dependent Claim
129 words
A PILE DRIVING AND PAVEMENT BREAKING HAMMER COMPRISING A HOUSING; A TOOL-CARRYING MEMBER HAVING A SHAFT EXTENDING INTO SAID HOUSING AT ONE END THEREOF; SAID SHAFT HAVING A BLOW RECEIVING AND TRANSMITTING ANVIL EXTENSION DISPOSED WITHIN SAID HOUSING; A HAMMER RECIPROCATABLY MOUNTED IN SAID HOUSING FOR A STROKE MOVEMENT IN LINE WITH SAID SHAFT TOWARD AND AWAY FROM SAID ANVIL EXTENSION; SAID HAMMER HAVING AN ELONGATED EXTENSION COAXIAL WITH SAID SHAFT AND EXTENDING IN SAID HOUSING AWAY FROM SAID HAMMER AND SAID ANVIL EXTENSION; A HELICAL SPRING MEANS SURROUNDING SAID HAMMER EXTENSION AND DISPOSED BETWEEN SAID HAMMER AND THE END OF SAID HOUSING OPPOSITE SAID ONE END; SAID SPRING MEANS INCLUDING AT LEAST TWO SEPARATE HELICAL SPRINGS IN END TO END RELATIONSHIP DIFFERING FROM EACH OTHER IN FREQUENCY OF
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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) | 1970-12-18 | 1971-06-19 | 1971-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-18 | 1975-06-19 | 1975-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-18 | 1979-06-19 | 1979-12-19 | $7700.00 | Window Closed / Lapsed |