Patent US3408897A successfully refreshed from Google Patents.
US3408897A
Expired / Lapsed
US
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Fluid power hammer having accumulator means to drive the hammer through its working stroke independent of the system pump
Assignee: Champion Inc
•
Filing: 1964-11-18
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Granted: 1968-11-05
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Expires: 1984-11-18
Abstract
No abstract record available.
Inventors
- 👤 Kenneth H Hoen
- 👤 Walter J Chapman
- 👤 Robert W Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:25
CPC Classifications
B; B25; B25D; B25D9/00; B25D9/06; B25D9/12; E; E01; E01C; E01C23/00; E01C23/06; E01C23/12; E01C23/122; E01C23/124; E02; E02D; E02D3/00; E02D3/02; E02D3/046; E02D3/068
Claims Analysis
Total Claims: 0
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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) | 1971-11-05 | 1972-05-06 | 1972-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-05 | 1976-05-06 | 1976-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-05 | 1980-05-06 | 1980-11-05 | $7700.00 | Window Closed / Lapsed |