US3249167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-lift vehicle and filament skirt therefor
Assignee: Tibbetts Industries Inc
•
Filing: 1964-05-01
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Granted: 1966-05-03
•
Expires: 1984-05-01
Abstract
No abstract record available.
Inventors
- 👤 Raymond W Tibbetts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:12
CPC Classifications
B; B60; B60V; B60V1/00; B60V1/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
FOR MAINTAINING AN AIR CUSHION UNDER THE BOTTOM OF A VEHICLE, A SKIRT COMPRISING HOLLOW RESILIENT FILAMENTS, THE THICKNESS OF THE SKIRT EXCEEDING THE DIAMETER OF THE FILAMENTS MANY TIMES AND THE FILAMENTS BEING CLOSELY PACKED TO FORM A LABYRINTH OF INTERSTITIAL SPACES BETWEEN THE FILAMENTS, THEREBY TO MINIMIZE THE PASSAGE OF AIR BETWEEN THE FILAMENTS, SAID HOLLOW FILAMENTS BEING OPEN AT THEIR UPPER ENDS FOR COMMUNICATION WITH PRESSURIZED AIR.
Claim 2
Dependent Claim
70 words
FOR MAINTAINING AN AIR CUSHION UNDER THE BOTTOM OF A VEHICLE, A SKIRT COMPRISING HOLLOW RESILIENT FILAMENTS, THE THICKNESS OF THE SKIRT EXCEEDING THE DIAMETER OF THE FILAMENTS MANY TIMES AND THE FILAMENTS BEING CLOSELY PACKED TO FORM A LABYRINTH OF INTERSTITIAL SPACES BETWEEN THE FILAMENTS, THEREBY TO MINIMIZE THE PASSAGE OF AIR BETWEEN THE FILAMENTS, SAID HOLLOW FILAMENTS BEING OPEN AT THEIR UPPER ENDS FOR COMMUNICATION WITH PRESSURIZED AIR.
References Cited (Backward Citations)
SU137405A1
Cited
US3055446A
Cited
US3137262A
Cited
US3078940A
Cited
US3172494A
Cited
US3134452A
Cited
FR1319034A
Cited
FR1339687A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |