Patent US3172494A successfully refreshed from Google Patents.
US3172494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Skirts of flexible filamentary members for ground effect machines
Assignee: Hovercraft Development Ltd
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Filing: 1961-04-13
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Granted: 1965-03-09
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Expires: 1981-04-13
Abstract
No abstract record available.
Inventors
- 👤 Cockerell Christopher Sydney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:33
CPC Classifications
B; B60; B60V; B60V1/00; B60V1/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A VEHICLE OR OTHER LAOD CARRYING DEVICE, MOVABLE OVER A SURFACE, HAVING A BODY WHICH IS AT LEAST PARTLY SUPPORTED ABOVE THAT SURFACE BY A CUSHION OF PRESSURISED GAS FORMED AND CONTAINED BENEATH THE BOTTOM OF SAID BODY, IN WHICH THE CUSHION OF PRESSURIZED GAS IS AT LEAST PARTLY CONTAINED AROUND AT LEAST PART OF ITS PERIPHERY BY A SERIES OF INDIVIDUALLY MOUNTED FLEXIBLE MEMBERS PROJECTING IN A DOWNWARD DIRECTION FROM THE BOTTOM OF SAID BODY AND CAPABLE OF DEFLECTION RELATIVE TO SAID BODY OVER AT LEAST PART OF THEIR LENGTH, SAID MEMBERS AND HAVING A PREDETERMINED SPACED APART RELATIONSHIP SUCH AS TO PERMIT A RESTRICTED FLOW OF GAS OUTWAD FROM SAID CUSHION TOWARD THE ATMOSPHERE THROUGH THE SPACES BETWEEN SAID MEMBERS, WHEREBY THE PRESSURE OF SAID GAS ACTS ON THAT PORTION OF THE BOTTOM OF SAID BODY FROM WHICH SAID MEMBERS PROJECT AS WELL AS THE PORTION CONTAINED WITHIN SAID MEMBERS.
Claim 2
Dependent Claim
152 words
A VEHICLE OR OTHER LAOD CARRYING DEVICE, MOVABLE OVER A SURFACE, HAVING A BODY WHICH IS AT LEAST PARTLY SUPPORTED ABOVE THAT SURFACE BY A CUSHION OF PRESSURISED GAS FORMED AND CONTAINED BENEATH THE BOTTOM OF SAID BODY, IN WHICH THE CUSHION OF PRESSURIZED GAS IS AT LEAST PARTLY CONTAINED AROUND AT LEAST PART OF ITS PERIPHERY BY A SERIES OF INDIVIDUALLY MOUNTED FLEXIBLE MEMBERS PROJECTING IN A DOWNWARD DIRECTION FROM THE BOTTOM OF SAID BODY AND CAPABLE OF DEFLECTION RELATIVE TO SAID BODY OVER AT LEAST PART OF THEIR LENGTH, SAID MEMBERS AND HAVING A PREDETERMINED SPACED APART RELATIONSHIP SUCH AS TO PERMIT A RESTRICTED FLOW OF GAS OUTWAD FROM SAID CUSHION TOWARD THE ATMOSPHERE THROUGH THE SPACES BETWEEN SAID MEMBERS, WHEREBY THE PRESSURE OF SAID GAS ACTS ON THAT PORTION OF THE BOTTOM OF SAID BODY FROM WHICH SAID MEMBERS PROJECT AS WELL AS THE PORTION CONTAINED WITHIN SAID MEMBERS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-08 | 1968-09-07 | 1969-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-08 | 1972-09-07 | 1973-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-08 | 1976-09-07 | 1977-03-09 | $7700.00 | Window Closed / Lapsed |