Patent US3765783A successfully refreshed from Google Patents.
US3765783A
Expired / Lapsed
US
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Composite drain to be used in soil types having low water premeability
Assignee: Orebro Pappersbruks AB
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Filing: 1971-07-06
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Granted: 1973-10-16
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Expires: 1991-07-06
Abstract
Abstract Embankments for roads, railways etc are made by using material having low water permeability, such as clay. The material is laid up in different layers, which are separated from each other by means of horizontally arranged strips of drains. The drains comprise an inner core having wave-shaped surfaces and outer sheets of water filtering material, so that water from the clay may go through the outer sheets into the space between the inner core and the outer sheets and flow out.
Inventors
- 👤 O Wager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:12
CPC Classifications
E; E01; E01F; E01F5/00; E02; E02B; E02B11/00; E02D; E02D3/00; E02D3/02; E02D3/10; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/24628; Y10T428/24661; Y10T428/24744
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
74 words
A composite drain to be used in soil types having low water permeability, characterized in that it consists essentially of an inner core of water-impermeable material having wave-shaped surfaces and that the corE on at least one surface is combined with a filtrating, water-permeable, sheetlike material, which maintains drainage channels formed between the core and the sheetlike material, said sheetlike material permitting the passage of water but preventing the passage of soil particles therethrough.
Claim 2
Dependent Claim
74 words
A composite drain to be used in soil types having low water permeability, characterized in that it consists essentially of an inner core of water-impermeable material having wave-shaped surfaces and that the corE on at least one surface is combined with a filtrating, water-permeable, sheetlike material, which maintains drainage channels formed between the core and the sheetlike material, said sheetlike material permitting the passage of water but preventing the passage of soil particles therethrough.
Claim 3
Dependent Claim
23 words
A composite drain according to claim 1, characterized in that the core comprises a strip-shaped, elongated material having wave-shaped surfaces on both sides.
Claim 4
Dependent Claim
31 words
A composite drain according to claim 1, characterized in that the core comprises a strip-shaped, elongated plastics material having wave-shaped surfaces on both sides, which both sides are combined with paper.
References Cited (Backward Citations)
US1025443A
Cited
US1241866A
Cited
US1969267A
Cited
US2183253A
Cited
US2192516A
Cited
US2259374A
Cited
US2225458A
Cited
US2609956A
Cited
US2811906A
Cited
US3041219A
Cited
US3346219A
Cited
US3700518A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |