Patent US3281107A successfully refreshed from Google Patents.
US3281107A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic support prop
Assignee: Ohio Brass Co
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Filing: 1965-12-15
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Granted: 1966-10-25
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Expires: 1985-12-15
Abstract
No abstract record available.
Inventors
- 👤 Warren J Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:45
CPC Classifications
E; E21; E21D; E21D15/00; E21D15/14; E21D15/44; E21D15/45
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
180 words
A HYDRAULIC DEVICE COMPRISING A BASE, A BASE HEAD, A BASE CYLINDER ON THE BASE HEAD, A TOP CYLINDER TELESCOPING INTO THE BASE CYLINDER AT THE END THEREOF AWAY FROM THE BASE, A TOP HEAD ON THE TOP CYLINDER AT THE END THEREOF AWAY FROM THE BASE, A CROSS HEAD ON THE HEAD CYLINDER AT THE END THEREOF ADJACENT THE BASE, COMPRISING A MOVABLE PISTON, A STAND PIPE EXTENDING FROM THE BASE HEAD LONGITUDINALLY THROUGH THE BASE CYLINDER AND MOVABLE PISTON INTO THE TOP CYLINDER, A CORSS HEAD IN THE TOP CYLINDER SECURED TO THE STAND PIPE AND COMRISING A FIXED PISTON, FLUID SEALING MEANS BETWEEN THE TOP CYLINDER AND THE BASE CYLINDER, BETWEEN THE FIXED PISTON AND THE TOP CYLINDER AND BETWEEN THE MOVABLE PISTON AND THE STAND PIPE, MEANS INCLUDING A CONDUIT THROUGH THE MOVABLE PISTON DETERMINING FLOW OF HYDRAULIC FLUID BETWEEN THE BASE CYLINDER AND TOP CYLINDER IN ONE DIRECTION THEREOF, AND MEANS INCLUDING A CONDUIT THROUGH THE STAND PIPE DETERMINING FLOW OF HYDRAULIC FLUID BETWEEN THE BASE CYLINDER AND TOP CYLINDER IN THE DIRECTION OPPOSITE THERETO.
Claim 2
Dependent Claim
180 words
A HYDRAULIC DEVICE COMPRISING A BASE, A BASE HEAD, A BASE CYLINDER ON THE BASE HEAD, A TOP CYLINDER TELESCOPING INTO THE BASE CYLINDER AT THE END THEREOF AWAY FROM THE BASE, A TOP HEAD ON THE TOP CYLINDER AT THE END THEREOF AWAY FROM THE BASE, A CROSS HEAD ON THE HEAD CYLINDER AT THE END THEREOF ADJACENT THE BASE, COMPRISING A MOVABLE PISTON, A STAND PIPE EXTENDING FROM THE BASE HEAD LONGITUDINALLY THROUGH THE BASE CYLINDER AND MOVABLE PISTON INTO THE TOP CYLINDER, A CORSS HEAD IN THE TOP CYLINDER SECURED TO THE STAND PIPE AND COMRISING A FIXED PISTON, FLUID SEALING MEANS BETWEEN THE TOP CYLINDER AND THE BASE CYLINDER, BETWEEN THE FIXED PISTON AND THE TOP CYLINDER AND BETWEEN THE MOVABLE PISTON AND THE STAND PIPE, MEANS INCLUDING A CONDUIT THROUGH THE MOVABLE PISTON DETERMINING FLOW OF HYDRAULIC FLUID BETWEEN THE BASE CYLINDER AND TOP CYLINDER IN ONE DIRECTION THEREOF, AND MEANS INCLUDING A CONDUIT THROUGH THE STAND PIPE DETERMINING FLOW OF HYDRAULIC FLUID BETWEEN THE BASE CYLINDER AND TOP CYLINDER IN THE DIRECTION OPPOSITE THERETO.
References Cited (Backward Citations)
FR1249070A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |