Patent US3612341A successfully refreshed from Google Patents.
US3609969A
Expired / Lapsed
US
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Hydraulic impact device
Assignee: CNH Industrial Baumaschinen GmbH
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Filing: 1969-06-27
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Granted: 1971-10-05
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Expires: 1989-06-27
Abstract
Abstract A HYDRAULIC IMPACT DEVICE WITH AN ALTERNATELY PRESSURE FLUID ACTUATED PISTON AND WITH A CONTROL VALVE FOR CONTROLLING THE IMPACT AND RETURN STROKE OF THE IMPACT PISTION, AND WITH AN IMPACT FORCE STORING HYDRAULIC ACCUMULATOR, IN WHICH THE IMPACT PISTON IS PROVIDED WITH A CENTRAL BLIND HOLE IN FLUID COMMUNICATION WITH A HYDRAULIC ACCUMULATOR ADAPTED INSTANTANEOUSLY TO RELEASE STORED FLUID INTO SAID BLIND HOLE.
Inventors
- 👤 Jurgen Gerber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:09
CPC Classifications
B; B25; B25D; B25D9/00; B25D9/06; B25D9/12; Y; Y10; Y10S; Y10S173/00; Y10S173/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |