Patent US3074384A successfully refreshed from Google Patents.
US3074384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pilot-operated ball check valve in cylinder head
Assignee: Individual
•
Filing: 1959-07-08
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Granted: 1963-01-22
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Expires: 1979-07-08
Abstract
No abstract record available.
Inventors
- 👤 John S Pilch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:59
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/01; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544; Y10T279/00; Y10T279/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
IN A DEVICE OF THE CHARACTER DESCRIBED, A HYDRAULIC CYLINDER HAVING A HOUSING, A DOUBLE ACTING PISTON IN SAID CYLINDER, A FLOW CONTROL VALVE IN SAID CYLINDER HOUSING ADJACENT AN END OF SAID CYLINDER AND ALLOWING UNRESTRICTED PASSAGE OF FLUID INTO ONE SIDE OF SAID CYLINDER BUT RESTRICTING THE EXIT OF FLUID FROM SAID CYLINDER, A HYDRAULIC LINE FOR SUPPLYING FLUID TO THE OPPOSITE SIDE OF SAID PISTON,
Claim 2
Dependent Claim
68 words
IN A DEVICE OF THE CHARACTER DESCRIBED, A HYDRAULIC CYLINDER HAVING A HOUSING, A DOUBLE ACTING PISTON IN SAID CYLINDER, A FLOW CONTROL VALVE IN SAID CYLINDER HOUSING ADJACENT AN END OF SAID CYLINDER AND ALLOWING UNRESTRICTED PASSAGE OF FLUID INTO ONE SIDE OF SAID CYLINDER BUT RESTRICTING THE EXIT OF FLUID FROM SAID CYLINDER, A HYDRAULIC LINE FOR SUPPLYING FLUID TO THE OPPOSITE SIDE OF SAID PISTON,
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-01-21 | 1966-07-23 | 1967-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-21 | 1970-07-23 | 1971-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-21 | 1974-07-23 | 1975-01-22 | $7700.00 | Window Closed / Lapsed |