US3570032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High vertical lift bridge
Assignee: Individual
•
Filing: 1969-03-07
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Granted: 1971-03-16
•
Expires: 1989-03-07
Abstract
Abstract THE INVENTION IS A VERTICAL LIFT BRIDGE WHICH IS RAISED UTILIZING HYDRAULICALLY DRIVEN PISTONS. IN ORDER THAT THE BRIDGE MAY BE RAISED TO A SUBSATANTIALLY HEIGHT, THE HYDRAULIC DRIVE SYSTEM IS ARRANGED TO RAISE THE BRIDGE IN A SERIES OF STEPS. THUS, EACH HYDRAULIC DRIVE MOTOR OPERATES ON A VERTICAL RAIL OR CHANNEL USING RELEASABLE GRIPPING SHOES WHICH PERMITS THE DRIVE CYLINDER TO BE FULLY EXTENDED A NUMBER OF TIMES SO THAT THE BRIDGE MAY BE RAISED TO A HEIGHT EQUAL TO MULTIPLES OF THE STROKE OF THE HYDRAULIC DRIVE MOTOR.
Inventors
- 👤 Earle F Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:00
CPC Classifications
E; E02; E02B; E02B17/00; E02B17/04; E02B17/08; E02B17/0836; E02B17/0854; E01; E01D; E01D15/00; E01D15/02
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) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |