Patent US2334929A successfully refreshed from Google Patents.
US3308497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power-operated loading ramp
Assignee: Symington Wayne Corp
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Filing: 1965-09-14
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Granted: 1967-03-14
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Expires: 1985-09-14
Abstract
No abstract record available.
Inventors
- 👤 Robert D Lambert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:40
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
206 words
A POWER-OPERATED RAMP FOR BRIDGING THE SPACE BETWEEN A VEHICLE BED AND A LOADING DOCK COMPRISING A PLATFORM, HINGE MEANS FOR CONNECTING THE REAR OF SAID PLATFORM TO THE EDGE OF SAID LOADING DOCK, POWERED ELEVATING MEANS CAPABLE OF REACTING BETWEEN SAID LOADING DOCK AND SAID PLATFORM FOR ROTATING IT UPWARDLY ABOUT SAID HINGE MEANS, A CONTROL MEANS CONNECTED TO SAID PLATFORM ARRANGED TO COOPERATE WITH SAID POWERED ELEVATING MEANS TO RAISE SAID PLATFORM TO AN UPWARDLY INCLINED POSITION ABOVE THE BED OF A VEHICLE AND TO CAUSE SAID PLATFORM TO LOWER UNDER THE INFLUENCE OF GRAVITY AND FREELY REST UPON SAID BED, AND A RETARDING MEANS CAPABLE OF REACTING BETWEEN SAID PLATFORM AND SAID LOADING DOCK FOR PREVENTING SAID PLATFORM FROM DROPPING TOO FAST WHEN ITS OUTER END IS UNSUPPORTED, SAID POWERED ELEVATING MEANS COMPRISING A VARYING MOMENT SPRING MEANS CAPABLE OF REACTING BETWEEN SAID PLATFORM AND SAID LOADING DOCK TO MAINTAIN SAID PLATFORM IN A SUBSTANTIALLY RAISED CONDITION ONLY WHEN IT IS ABOVE A PREDETERMINED ANGLE OF INCLINATION, AND SAID CONTROL MEANS COMPRISING AN AUXILIARY LIFTING MEANS CAPABLE OF REACTING BETWEEN SAID PLATFORM AND SAID LOADING DOCK FOR CAUSING SAID PLATFORM TO RISE FROM A POSITION BELOW SAID PREDETERMINED ANGLE TO ONE ABOVE IT.
Claim 2
Dependent Claim
206 words
A POWER-OPERATED RAMP FOR BRIDGING THE SPACE BETWEEN A VEHICLE BED AND A LOADING DOCK COMPRISING A PLATFORM, HINGE MEANS FOR CONNECTING THE REAR OF SAID PLATFORM TO THE EDGE OF SAID LOADING DOCK, POWERED ELEVATING MEANS CAPABLE OF REACTING BETWEEN SAID LOADING DOCK AND SAID PLATFORM FOR ROTATING IT UPWARDLY ABOUT SAID HINGE MEANS, A CONTROL MEANS CONNECTED TO SAID PLATFORM ARRANGED TO COOPERATE WITH SAID POWERED ELEVATING MEANS TO RAISE SAID PLATFORM TO AN UPWARDLY INCLINED POSITION ABOVE THE BED OF A VEHICLE AND TO CAUSE SAID PLATFORM TO LOWER UNDER THE INFLUENCE OF GRAVITY AND FREELY REST UPON SAID BED, AND A RETARDING MEANS CAPABLE OF REACTING BETWEEN SAID PLATFORM AND SAID LOADING DOCK FOR PREVENTING SAID PLATFORM FROM DROPPING TOO FAST WHEN ITS OUTER END IS UNSUPPORTED, SAID POWERED ELEVATING MEANS COMPRISING A VARYING MOMENT SPRING MEANS CAPABLE OF REACTING BETWEEN SAID PLATFORM AND SAID LOADING DOCK TO MAINTAIN SAID PLATFORM IN A SUBSTANTIALLY RAISED CONDITION ONLY WHEN IT IS ABOVE A PREDETERMINED ANGLE OF INCLINATION, AND SAID CONTROL MEANS COMPRISING AN AUXILIARY LIFTING MEANS CAPABLE OF REACTING BETWEEN SAID PLATFORM AND SAID LOADING DOCK FOR CAUSING SAID PLATFORM TO RISE FROM A POSITION BELOW SAID PREDETERMINED ANGLE TO ONE ABOVE IT.
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) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |