Patent US1348419A successfully refreshed from Google Patents.
Patent US3203019A successfully refreshed from Google Patents.
US3203019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manually operated dockboard construction
Assignee: T AND S EQUIPMENT Co
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Filing: 1962-12-21
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Granted: 1965-08-31
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Expires: 1982-12-21
Abstract
No abstract record available.
Inventors
- 👤 Clear Robert L Le
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:49
CPC Classifications
B; B65; B65G; B65G69/00; B65G69/28; B65G69/2805; B65G69/2811; B65G69/2835; B65G69/2841
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
170 words
IN A DOCKBOARD INCLUDING A FRAME ASSEMBLY, A CARRIAGE ASSEMBLY SUPPORTED FOR FORWARD AND REARWARD MOVEMENT ON SAID FRAME ASSEMBLY, A RAMP PIVOTALLY MOUNTED ON SAID CARRIAGE ASSEMBLY, MEANS TO PARTIALLY COUNTERBALANCE THE WEIGHT OF SAID RAMP, YIELDABLE MEANS TO URGE SAID CARRIAGE ASSEMBLY REARWARDLY ON SAID FRAME, AND MEANS TO RAISE SAID RAMP AND MOVE SAID CARRIAGE ASSEMBLY FORWARDLY ON SAID FRAME ASSEMBLY, THE IMPROVEMENT COMPRISING LATCH MEANS FOR RELEASABLY RETAINING SAID CARRIAGE ASSEMBLY IN ADJUSTED FORWARD POSITION, SAID LATCH MEANS COMPRISING A HYDRAULIC CYLINDER SECURED TO ONE OF SAID ASSEMBLIES, A PISTON SLIDABLE IN SAID CYLINDER AND HAVING A PISTON ROD SECURED TO THE OTHER OF SAID ASSEMBLIES, A CONDUIT CONNECTING THE ENDS OF SAID CYLINDER ON OPPOSITE SIDES OF SAID PISTON TO PROVIDE A CLOSED HYDRAULIC CIRCUIT FOR THE FLOW OF FLUID BETWEEN OPPOSITE ENDS OF SAID CYLINDER, A RELEASABLE CHECK VALVE IN SAID CIRCUIT TO PERMIT FREE FLOW OF FLUID FROM ONE SIDE OF SAID PISTON TO THE OTHER SIDE WHEN SAID CARRIAGE ASSEMBLY MOVES FORWARDLY,
Claim 2
Dependent Claim
170 words
IN A DOCKBOARD INCLUDING A FRAME ASSEMBLY, A CARRIAGE ASSEMBLY SUPPORTED FOR FORWARD AND REARWARD MOVEMENT ON SAID FRAME ASSEMBLY, A RAMP PIVOTALLY MOUNTED ON SAID CARRIAGE ASSEMBLY, MEANS TO PARTIALLY COUNTERBALANCE THE WEIGHT OF SAID RAMP, YIELDABLE MEANS TO URGE SAID CARRIAGE ASSEMBLY REARWARDLY ON SAID FRAME, AND MEANS TO RAISE SAID RAMP AND MOVE SAID CARRIAGE ASSEMBLY FORWARDLY ON SAID FRAME ASSEMBLY, THE IMPROVEMENT COMPRISING LATCH MEANS FOR RELEASABLY RETAINING SAID CARRIAGE ASSEMBLY IN ADJUSTED FORWARD POSITION, SAID LATCH MEANS COMPRISING A HYDRAULIC CYLINDER SECURED TO ONE OF SAID ASSEMBLIES, A PISTON SLIDABLE IN SAID CYLINDER AND HAVING A PISTON ROD SECURED TO THE OTHER OF SAID ASSEMBLIES, A CONDUIT CONNECTING THE ENDS OF SAID CYLINDER ON OPPOSITE SIDES OF SAID PISTON TO PROVIDE A CLOSED HYDRAULIC CIRCUIT FOR THE FLOW OF FLUID BETWEEN OPPOSITE ENDS OF SAID CYLINDER, A RELEASABLE CHECK VALVE IN SAID CIRCUIT TO PERMIT FREE FLOW OF FLUID FROM ONE SIDE OF SAID PISTON TO THE OTHER SIDE WHEN SAID CARRIAGE ASSEMBLY MOVES FORWARDLY,
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) | 1968-08-30 | 1969-03-01 | 1969-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-30 | 1973-03-01 | 1973-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-30 | 1977-03-01 | 1977-08-31 | $7700.00 | Window Closed / Lapsed |