Patent US3139947A successfully refreshed from Google Patents.
US3139947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cushion vehicle for travelling over irregular terrain
Assignee: NAT RES ASSOCIATES Inc
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Filing: 1961-04-24
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Granted: 1964-07-07
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Expires: 1981-04-24
Abstract
No abstract record available.
Inventors
- 👤 Melville W Beardsley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:27
CPC Classifications
B; B60; B60V; B60V1/00; B60V1/04; B60V1/043
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
AN AIR CUSHION VEHICLE COMPRISING A PLENUM SHELL, MEANS TO BLOW AIR INTO SAID PLENUM SHELL, A BOTTOM SURFACE UNDER SAID SHELL, SAID PLENUM SHELL COMPRISING AN IMPERVIOUS FLEXIBLE SIDE WALL, AND A SUBSTANTIALLY HORIZONTAL RIGID TOP SURFACE LINEARLY CONNECTED TO SAID FLEXIBLE SIDE WALL, SAID BOTTOM SURFACE COMPRISING A CENTER SECTION OF SUBSTANTIALLY IMPERVIOUS MATERIAL FIXEDLY SECURED TO SAID TOP SURFACE MATERIAL, A FLEXIBLE AREA OF SUBSTANTIALLY IMPERVIOUS MATERIAL SUBSTANTIALLY CONCENTRIC WITH SAID CENTER SECTION AND ATTACHED THERETO, AND RIGID SECTIONS LOCATED ON THE PERIPHERY OF SAID FLEXIBLE AREA AND FLEXIBLY ATTACHED THERETO AND TO EACH OTHER, THE OUTER EDGES OF SAID RIGID SECTIONS SPACED FROM THE BOTTOM OF SAID FLEXIBLE SIDE WALL
Claim 2
Dependent Claim
114 words
AN AIR CUSHION VEHICLE COMPRISING A PLENUM SHELL, MEANS TO BLOW AIR INTO SAID PLENUM SHELL, A BOTTOM SURFACE UNDER SAID SHELL, SAID PLENUM SHELL COMPRISING AN IMPERVIOUS FLEXIBLE SIDE WALL, AND A SUBSTANTIALLY HORIZONTAL RIGID TOP SURFACE LINEARLY CONNECTED TO SAID FLEXIBLE SIDE WALL, SAID BOTTOM SURFACE COMPRISING A CENTER SECTION OF SUBSTANTIALLY IMPERVIOUS MATERIAL FIXEDLY SECURED TO SAID TOP SURFACE MATERIAL, A FLEXIBLE AREA OF SUBSTANTIALLY IMPERVIOUS MATERIAL SUBSTANTIALLY CONCENTRIC WITH SAID CENTER SECTION AND ATTACHED THERETO, AND RIGID SECTIONS LOCATED ON THE PERIPHERY OF SAID FLEXIBLE AREA AND FLEXIBLY ATTACHED THERETO AND TO EACH OTHER, THE OUTER EDGES OF SAID RIGID SECTIONS SPACED FROM THE BOTTOM OF SAID FLEXIBLE SIDE WALL
References Cited (Backward Citations)
FR1238499A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |