Patent US3971220A successfully refreshed from Google Patents.
US3971220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil fence
Assignee: Mitsubishi Electric Corp
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Filing: 1974-02-15
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Granted: 1976-07-27
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Expires: 1994-02-15
Abstract
Abstract An array of semicylindrical floats juxtaposed on one surface of a longitudinally elongated screen about each of spaced cross strips on the screen opposes a similar array disposed on the other surface of the screen and a chain-shaped sinker is disposed along one longitudinal edge of the screen. Also a floating framework is disclosed having one side partly cut away and roll means disposed in front of the cut-away portion. The roll means can be driven to sinuously house the oil fence within the framework and to pay it out from the latter. Alternatively, a takeup shaft disposed in a box-shaped member with buoyant chambers and fenders may be driven to coil and uncoil the oil fence on and from it through one open side of the box-shaped member.
Inventors
- 👤 Takeo Kinase
- 👤 Isamu Yano
- 👤 Kanichi Okubo
- 👤 Hidetoshi Kitakoga
- 👤 Hiromitsu Tayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:40
CPC Classifications
E; E02; E02B; E02B15/00; E02B15/04; E02B15/08; E02B15/0814; E02B15/0835; E02B15/0857; E02B15/0885; Y; Y02; Y02A; Y02A20/00; Y02A20/20; Y02A20/204
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
323 words
An oil fence comprising, in combination: an elongated water impervious sheet-like flexible shielding screen having a pair of opposed longitudinal edges and a pair of opposed major surfaces; a plurality of rigid reinforcing strips disposed at intervals along the longitudinal dimension of said shielding screen and extending in a transverse dimension of said shielding screen; means for fixing said rigid reinforcing strips to said shielding screen; a plurality of pairs of opposed rigid elongated floats, each pair of opposed floats comprising a first float adjacent one of said opposed major surfaces and a second float adjacent the other of said opposed major surfaces and opposite said first float, each of said pairs of opposed floats being disposed along the longitudinal dimension of said shielding screen and extending in the transverse dimension thereof and spaced from other pairs of said opposed floats to permit flexing of the shielding screen at the spaces between pairs of said opposed floats, said pairs of opposed floats being disposed in groups about respective ones of said reinforcing strips and wherein the respective groups of floats are spaced apart along the longitudinal dimension of said shielding screen; means for fixing said pairs of opposed floats to said shielding screen comprising a plurality of sheet-like members each overlying a respective one of said groups of floats and each adhered to said shielding screen at the border of the respective one of said groups and at the spaces defined between adjacent ones of the pairs of said opposed floats comprising the respective one of said groups to maintain said groups of floats adjacent to said shielding screen; means disposed along a longitudinal edge portion of said shielding screen for weighting said edge portion to eliminate the buoyancy thereof; a rope-like reinforcing member disposed on a surface of said shielding screen and extending along a longitudinal dimension of said shielding screen; and means for fixing said reinforcing member to said shielding screen.
Claim 2
Dependent Claim
323 words
An oil fence comprising, in combination: an elongated water impervious sheet-like flexible shielding screen having a pair of opposed longitudinal edges and a pair of opposed major surfaces; a plurality of rigid reinforcing strips disposed at intervals along the longitudinal dimension of said shielding screen and extending in a transverse dimension of said shielding screen; means for fixing said rigid reinforcing strips to said shielding screen; a plurality of pairs of opposed rigid elongated floats, each pair of opposed floats comprising a first float adjacent one of said opposed major surfaces and a second float adjacent the other of said opposed major surfaces and opposite said first float, each of said pairs of opposed floats being disposed along the longitudinal dimension of said shielding screen and extending in the transverse dimension thereof and spaced from other pairs of said opposed floats to permit flexing of the shielding screen at the spaces between pairs of said opposed floats, said pairs of opposed floats being disposed in groups about respective ones of said reinforcing strips and wherein the respective groups of floats are spaced apart along the longitudinal dimension of said shielding screen; means for fixing said pairs of opposed floats to said shielding screen comprising a plurality of sheet-like members each overlying a respective one of said groups of floats and each adhered to said shielding screen at the border of the respective one of said groups and at the spaces defined between adjacent ones of the pairs of said opposed floats comprising the respective one of said groups to maintain said groups of floats adjacent to said shielding screen; means disposed along a longitudinal edge portion of said shielding screen for weighting said edge portion to eliminate the buoyancy thereof; a rope-like reinforcing member disposed on a surface of said shielding screen and extending along a longitudinal dimension of said shielding screen; and means for fixing said reinforcing member to said shielding screen.
Claim 3
Dependent Claim
14 words
An oil fence according to claim 1, wherein said rigid elongated floats are semicylindrical.
Claim 4
Dependent Claim
34 words
An oil fence according to claim 1, wherein the floats comprising one pair of opposed floats within one of said groups overlie the one of said reinforcing strips about which said group is disposed.
References Cited (Backward Citations)
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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) | 1979-07-27 | 1980-01-26 | 1980-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-27 | 1984-01-26 | 1984-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-27 | 1988-01-26 | 1988-07-27 | $7700.00 | Window Closed / Lapsed |