US3643757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible skirts for surface-effect machines
Assignee: Societe dEtudes et de Developpement des Aeroglisseurs Marins SEDAM SA
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Filing: 1969-05-07
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Granted: 1972-02-22
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Expires: 1989-05-07
Abstract
Abstract A skirt for peripherally confining a fluid cushion for a surface-effect machine, comprising a fluidtight flexible sheet encircled by a plurality of transverse hoops made of a material less deformable in the peripheral direction of the skirt than that of the sheet, whereby the said hoops cooperate with the said sheet in such a manner that the height of the skirt automatically decreases when the pressure of the cushion increases.
Inventors
- 👤 Guy Robert Delamare
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:14
CPC Classifications
B; B60; B60V; B60V1/00; B60V1/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
124 words
A yieldable skirting system for surface effect machines, comprising the combination of a close-contour fluidtight skirt wall of elastic structure which has substantial resilient extensibility radialwise upon exertion of internal fluid pressure on said skirt wall which is thereby peripherally stretchable to a substantial extent, and a plurality of hoops fitted peripherally on and mutually spaced lengthwise of said skirt wall, said hoops being of a material which is relatively inextensible radialwise compared with said skirt wall upon such exertion of internal pressure thereon and being thereby peripherally unstretchable relatively to the peripheral stretchability of said skirt wall, whereby said skirt wall, upon such exertion of pressure thereon, is caused to bulge between successive hoops with a part toroidal outline of smoothly curved shape.
Claim 2
Dependent Claim
124 words
A yieldable skirting system for surface effect machines, comprising the combination of a close-contour fluidtight skirt wall of elastic structure which has substantial resilient extensibility radialwise upon exertion of internal fluid pressure on said skirt wall which is thereby peripherally stretchable to a substantial extent, and a plurality of hoops fitted peripherally on and mutually spaced lengthwise of said skirt wall, said hoops being of a material which is relatively inextensible radialwise compared with said skirt wall upon such exertion of internal pressure thereon and being thereby peripherally unstretchable relatively to the peripheral stretchability of said skirt wall, whereby said skirt wall, upon such exertion of pressure thereon, is caused to bulge between successive hoops with a part toroidal outline of smoothly curved shape.
Claim 3
Dependent Claim
68 words
Skirting system as claimed in claim 1, wherein said skirt wall is lobated in planform and comprises a succession of lobes extending around a longitudinal axis of said skirt wall and joined to each otHer along cuspidal edges, and said hoops are likewise lobated and comprise a like succession of lobes extending around said axis and joined to each other at cuspidal points located on said cuspidal edges.
Claim 4
Dependent Claim
26 words
Skirting system as claimed in claim 2, further comprising tie members attached to said cuspidal points of said hoops and extending inwardly of said skirt wall.
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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) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |