US4326822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Artificial island for installing oil drilling equipment in ice covered sea areas
Assignee: Mitsui Engineering and Shipbuilding Co Ltd
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Filing: 1979-11-27
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Granted: 1982-04-27
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Expires: 1999-11-27
Abstract
Abstract An artificial island for installing oil drilling equipment in ice covered sea areas, comprising barricades against ice which surround oil drilling equipment installed in ice covered sea-water and whose respective top portions are projected above the surface of the sea-water, means provided at the bottom portions of the barricades so as to fix them to the sea-bottom, and inclined ice breaking walls provided at the outer sides of the barricades.
Inventors
- 👤 Masanao Oshima
- 👤 Nobuyoshi Yashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:05
CPC Classifications
E; E02; E02B; E02B17/00; E02B17/0017; E02B17/0021
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
140 words
An artificial island for installing oil drilling equipment in ice covered sea areas, comprising at least two rows of ice barricades for surrounding at least a portion of oil drilling equipment in ice covered sea water, the top portion of each said barricades projecting above the surface of the sea water, means provided at the bottom portion of at least the outermost one of said barricades to fix said barricade to the sea-bottom, and inclined ice breaking wall means provided at a side of at least the outermost one of said barricades which is opposite the side of said barricade which faces the oil drilling equipment, wherein said rows of barricades are separated from one another such that a space is formed therebetween, said space receiving at least a portion of the ice broken by said inclined ice breaking walls.
Claim 2
Dependent Claim
140 words
An artificial island for installing oil drilling equipment in ice covered sea areas, comprising at least two rows of ice barricades for surrounding at least a portion of oil drilling equipment in ice covered sea water, the top portion of each said barricades projecting above the surface of the sea water, means provided at the bottom portion of at least the outermost one of said barricades to fix said barricade to the sea-bottom, and inclined ice breaking wall means provided at a side of at least the outermost one of said barricades which is opposite the side of said barricade which faces the oil drilling equipment, wherein said rows of barricades are separated from one another such that a space is formed therebetween, said space receiving at least a portion of the ice broken by said inclined ice breaking walls.
Claim 3
Dependent Claim
32 words
An artificial island for installing oil drilling equipment in ice covered sea areas according to claim 1, wherein each of said barricades is formed by a plurality of piled sand packed tubes.
Claim 4
Dependent Claim
41 words
An artificial island for installing oil drilling equipment in ice covered sea areas according to claim 1, wherein each of said barricades is formed by a plurality of piled sand packed tubes laid on a base plate set on the sea-bottom.
Claim 5
Dependent Claim
49 words
An artificial island for installing oil drilling equipment in ice covered sea areas according to claim 1, wherein each of said barricades is formed by a plurality of tubes containing sand therein and piled in layers, each of which tubes consists of an elongated bag made of water-permeable fabric.
Claim 6
Dependent Claim
69 words
An artificial island for installing oil drilling equipment in ice covered sea areas according to claim 1, wherein each of said barricades is formed by a plurality of tubes containing sand therein and piled in layers, each of which tubes consists of an elongated, water-impermeable, flexible bag having a sand slurry injection port at one end portion thereof and a water discharge port at the other end portion thereof.
Claim 7
Dependent Claim
53 words
An artificial island for installing oil drilling equipment in ice covered sea areas according to claim 1, wherein each of said barricades consists of a box structure made of steel plates and containing ballast tanks therein, a part of the side walls of said barricades serving as an inclined ice breaking wall means.
Claim 8
Dependent Claim
52 words
An artificial island for installing oil drilling equipment in ice covered sea areas according to claim 1, wherein each of said barricades consists of a box structure made of steel plates and containing sand therein, a part of the side walls of said barricades serving as an inclined ice breaking wall means.
Claim 9
Dependent Claim
52 words
An artificial island for installing oil drilling equipment in ice covered sea areas according to claim 1, wherein each of said barricades consists of a box structure made of ferro-concrete and containing ballast tanks therein, a part of the side walls of said barricades serving as an inclined ice breaking wall means.
Claim 10
Dependent Claim
51 words
An artificial island for installing oil drilling equipment in ice covered sea areas according to claim 1, wherein each of said barricades consists of a box structure made of ferro-concrete and containing sand therein, a part of the side walls of said barricades serving as an inclined ice breaking wall means.
Claim 11
Dependent Claim
51 words
An artificial island for installing oil drilling equipment in ice covered sea areas according to claim 1, wherein each of said barricades has a substantially triangular cross section at right angles to the longitudinal direction thereof, the base of the triangular cross section being put on the side of the sea-bottom.
Claim 12
Dependent Claim
51 words
An artificial island for installing oil drilling equipment in ice covered sea areas according to claim 1, wherein each of said barricades has a substantially trapezoidal cross section at right angles to the longitudinal direction thereof, the base of the trapezoidal cross section being put on the side of the sea-bottom.
Claim 13
Dependent Claim
33 words
An artificial island for installing oil drilling equipment in ice covered sea areas according to claim 1, wherein adjacent two of said barricades are provided with sand packed bags or tubes accumulated therebetween.
Claim 14
Dependent Claim
31 words
An artificial island for installing oil drilling equipment in ice covered sea areas according to claim 1, wherein adjacent two of said barricades are provided with sand or gravel accumulated therebetween.
Claim 15
Dependent Claim
30 words
An artificial island for installing oil drilling equipment in ice covered sea areas according to claim 1, wherein adjacent two of said barricades are provided with ice blocks accumulated therebetween.
Claim 16
Dependent Claim
43 words
An artificial island for installing oil drilling equipment in ice covered sea areas according to claim 1, wherein adjacent two of said barricades are provided therebetween with a plurality of flexible air-containing tubes which cover the surface of the sea-water between said barricades.
Claim 17
Dependent Claim
38 words
An artificial island for installing oil drilling equipment in ice covered sea areas according to claim 1, wherein said ice breaking wall means has an angle of inclination of 30°-65° with respect to the surface of the sea-water.
Claim 18
Dependent Claim
31 words
An artificial island for installing oil drilling equipment in ice covered sea areas according to claim 1, wherein said fixing means consist of a plurality of projections extended into the sea-bottom.
Claim 19
Dependent Claim
35 words
An artificial island for installing oil drilling equipment in ice covered sea areas according to claim 1, wherein said barricades surrounding oil drilling equipment are disposed at least on the upstream side of floating ice.
References Cited (Backward Citations)
US7799A
Cited
US946841A
Cited
US3675430A
Cited
CA972975A
Cited
US3957098A
Cited
US3886751A
Cited
US4012917A
Cited
US4080798A
Cited
SU632799A1
Cited
US4242012A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-26 | 1985-10-26 | 1986-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-26 | 1989-10-26 | 1990-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-26 | 1993-10-26 | 1994-04-27 | $7700.00 | Window Closed / Lapsed |