US3717103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low drag magnetic suspension system
Assignee: Boeing North American Inc
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Filing: 1970-12-11
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Granted: 1973-02-20
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Expires: 1990-12-11
Abstract
Abstract THIS COMBINATION SUSPENSION SYSTEM PROVIDES EFFECTIVE LIFT AT LOW SPEEDS AND GREATLY IMPROVED LIFT/DRAG RATIOS. AN IMPROVED MAGNETIC SUSPENSION SYSTEM INCLUDING AN IMPROVED GUIDE-WAY CHANNEL FOR MOVING BODIES INCLUDING VEHICLES OF EDDY CURRENT REPLUSION BETWEEN SAID MAGNETS AND SAID GUIDE-WAY CHANNEL CONTAINING NONFERROMAGNETIC CONDUCTORS AND ATTRACTION TO A FERROMAGNETIC MEMBER.
Inventors
- 👤 C Guderjahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:49
CPC Classifications
B; B60; B60L; B60L13/00; B60L13/04; B61; B61B; B61B13/00; B61B13/08; B60L2200/00; B60L2200/26
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |