Patent US3702645A successfully refreshed from Google Patents.
US3702645A
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US
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Assignee: Fred Hill and Son Co
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Filing: 1970-09-18
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Granted: 1972-11-14
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Expires: 1990-09-18
Abstract
Abstract A LOADING PLATFORM, WHICH IS ADAPTED TO BE RAISED AND LOWERED TO FACILITATE THE TRANSFER OF OBJECTS FROM ONE LEVEL TO ANOTHER, IS PROVIDED WITH AN AUTOMATICALLY OPERABLE BARRIER WHICH IS RAISED AND LOWERED IN RESPONSE TO RAISING AND LOWERING OF THE LOADING PLATFORM TO PROVIDE PROTECTION FOR PERSONNEL WHEN THE PLATFORM IS IN ITS ELEVATED POSITION WHILE PERMITTING FREE ACCESS TO THE PLATFORM IN ITS LOWERED POSITION. ALSO MEANS ARE PROVIDED AUTOMATICALLY RESPONSIVE TO THE RAISING AND LOWERING OF THE PLATFORM FOR POSITIONING A RAMP PLATE FOR BRIDGING A GAP BETWEEN THE PLATFORM AND AN ADJACENT SURFACE TO OR FROM WHICH OBJECTS ARE TO BE TRANSFERRED.
Inventors
- 👤 Kenneth Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:26
CPC Classifications
B; B66; B66F; B66F7/00; B66F7/06; B66F7/08; B65; B65G; B65G69/00; B65G69/22; B65G69/24; B66F7/065
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) | 1975-11-14 | 1976-05-15 | 1976-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-14 | 1980-05-15 | 1980-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-14 | 1984-05-15 | 1984-11-14 | $7700.00 | Window Closed / Lapsed |