US4246305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drainage structure and process
Assignee: Solentanche-Entreprise
•
Filing: 1978-03-22
•
Granted: 1981-01-20
•
Expires: 1998-03-22
Abstract
Abstract This invention relates to drainage by use of elongated strips of such a physical structure that they allow an exchange of fluids between their core and the medium in which they are placed. The drainage strips are used by vertically placing them in wet soils to evacuate water contained in said soils by use of a pressure differential exerted upon the water due to the pressure of the soil layer over the atmospheric pressure in the interstices of the drainage structure.
Inventors
- 👤 Henri Delattre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:04
CPC Classifications
E; E02; E02B; E02B11/00; B; B29; B29C; B29C48/00; B29C48/022; B29C48/03; B29C48/09; B29C48/11; B29C48/12; B29C48/13; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/139; Y10T428/24; Y10T428/24273; Y10T428/24744
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
117 words
A durable underground drain of improved permeability for exchanging fluids between mediums in which said drain is placed, said drain comprising: a flat, elongated, flexible, polyolefin strip, said strip having about 25 channels of cross-sectional area less than 1 cm 2 extending longitudinally therethrough, said strip having at least one end open; said strip further having two opposed external walls, both of said walls having perforations of about 0.1 to 0.5 mm diameter each so as to communicate with said plurality of channels; so that when said drain is placed in a medium, fluid will flow between said medium and said plurality of channels according to the pressure differential between said plurality of channels and said medium.
Claim 2
Dependent Claim
117 words
A durable underground drain of improved permeability for exchanging fluids between mediums in which said drain is placed, said drain comprising: a flat, elongated, flexible, polyolefin strip, said strip having about 25 channels of cross-sectional area less than 1 cm 2 extending longitudinally therethrough, said strip having at least one end open; said strip further having two opposed external walls, both of said walls having perforations of about 0.1 to 0.5 mm diameter each so as to communicate with said plurality of channels; so that when said drain is placed in a medium, fluid will flow between said medium and said plurality of channels according to the pressure differential between said plurality of channels and said medium.
Claim 3
Dependent Claim
98 words
A process for forming a drain, said drain being in the form of a flat, elongated, polyolefin strip, said strip having a plurality of channels extending longitudinally therethrough, said strip further having external walls, said walls having perforations so as to communicate with said plurality of channels, said process comprising the steps of: (a) extruding polyolefin as a flat, elongate strip having a plurality of channels extending longitudinally therethrough, said strip further having external walls and at least one end open; and (b) perforating said walls with a pointed cylinder rolling upon said strip after it is extruded.
Claim 4
Dependent Claim
98 words
A process for forming a drain, said drain being in the form of a flat, elongated, polyolefin strip, said strip having a plurality of channels extending longitudinally therethrough, said strip further having external walls, said walls having perforations so as to communicate with said plurality of channels, said process comprising the steps of: (a) extruding polyolefin as a flat, elongate strip having a plurality of channels extending longitudinally therethrough, said strip further having external walls and at least one end open; and (b) perforating said walls with a pointed cylinder rolling upon said strip after it is extruded.
Claim 5
Dependent Claim
97 words
A process for forming a drain, said drain being in the form of a flat, elongated, polyolefin strip, said strip having a plurality of channels extending longitudinally therethrough, said strip further having external walls, said walls having perforations so as to communicate with said plurality of channels, said process comprising the steps of: (a) extruding polyolefin as a flat, elongate strip having a plurality of channels extending longitudinally therethrough, said strip further having external walls and at least one end open; and (b) perforating said walls with a laser ray scanning said strip after it is extruded.
Claim 6
Dependent Claim
97 words
A process for forming a drain, said drain being in the form of a flat, elongated, polyolefin strip, said strip having a plurality of channels extending longitudinally therethrough, said strip further having external walls, said walls having perforations so as to communicate with said plurality of channels, said process comprising the steps of: (a) extruding polyolefin as a flat, elongate strip having a plurality of channels extending longitudinally therethrough, said strip further having external walls and at least one end open; and (b) perforating said walls with a laser ray scanning said strip after it is extruded.
Claim 7
Dependent Claim
121 words
A process for forming a drain, said drain being in the form of a flat, elongated, polyolefin strip, said strip having a plurality of channels extending longitudinally therethrough, said strip further having external walls, said walls having perforations so as to communicate with said plurality of channels, said process comprising the steps of: (a) dispersing microscopic fillers in the polyolefin to be extruded; (b) extruding said polyolefin as a flat, elongate strip having a plurality of channels extending longitudinally therethrough, said strip further having external walls and at least one end open; and (c) passing said strip through a solvent so as to dissolve said microscopic filler when the strip passes through said solvent, therefore perforating said walls of said strip.
Claim 8
Dependent Claim
121 words
A process for forming a drain, said drain being in the form of a flat, elongated, polyolefin strip, said strip having a plurality of channels extending longitudinally therethrough, said strip further having external walls, said walls having perforations so as to communicate with said plurality of channels, said process comprising the steps of: (a) dispersing microscopic fillers in the polyolefin to be extruded; (b) extruding said polyolefin as a flat, elongate strip having a plurality of channels extending longitudinally therethrough, said strip further having external walls and at least one end open; and (c) passing said strip through a solvent so as to dissolve said microscopic filler when the strip passes through said solvent, therefore perforating said walls of said strip.
References Cited (Backward Citations)
US2621075A
Cited
US2802530A
Cited
US2749180A
Cited
US2814529A
Cited
US3079620A
Cited
US3080124A
Cited
US3274315A
Cited
US3973329A
Cited
US4042741A
Cited
US4057500A
Cited
US4095750A
Cited
US4113818A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-20 | 1984-07-21 | 1985-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-20 | 1988-07-21 | 1989-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-20 | 1992-07-21 | 1993-01-20 | $7700.00 | Window Closed / Lapsed |