High speed ground transportation system
Abstract
Abstract A HIGH-SPEED GROUND TRANSPORATATION SYSTEM COMPRISES A DUCT THROUGH WHICH A VEHICLE IS ADAPTED FOR PROPULSION AS A FREE PISTION. ENTRANCE AND EXIT VALVES ARE PROVIDED ADJACENT THE ENDS OF THE DUCT AND THE SECTION OF THE DUCT BETWEEN THE VALVES IS PREVACUATED. ON OPENING THE ENTRANCE VALVE, AIR PRESSURE FORCES THE VEHICLE INTO THE SECTION AND AFTER THE VEHICLE HAS PASSED THE ENTRANCE VALVE AND A PREDETERMINED AMOUNT OF PROPULSIVE AIR HAS AN ENTERED THE DUCT BEHIND THE VEHICLE, THE VALVE IS CLOSED. A CUT-OFF VALVE IS PROVIDED IN THE DUCT DOWNSTREAM THE ENTRANE VALVE FOR PREVENTING THE PROPULSION AIR ADMITTED BEHIND THE VEHICLE FROM ENTERING THE MAIN BODY OF THE DUCT. THE EXIT VALVE OPENS WHEN THE PRESSURE AHEAD OF THE VEHICLE REACHES A PREDETERMINED PRESSURE.
Inventors
- 👤 Lawrence K Edwards
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |