US5263792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Finned subterranean drainage device and method for fabricating the same
Assignee: WR Grace and Co Conn
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Filing: 1992-10-26
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Granted: 1993-11-23
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Expires: 2012-10-26
Abstract
Abstract This invention provides an improved rollable subterranean drainage core device which has T-shaped finned projections to which may be adhered a water-penetrable soil filtration fabric. The fin structure provides impact resistance and high compressive strength while providing high water channel flow-through capabilities. An exemplary method for fabricating the drainage device involves extruding a unitary finned polymeric core sheet having T-shaped projection members on at least one major side thereof, and then removing a portion of the fins in a cross direction at periodic intervals along the machine direction, so that individual T-shaped projection members are spaced in rows and columns on the rollable core sheet. The drainage core member is particularly suitable for use in conjunction with waterproofing membranes.
Inventors
- 👤 Everett R. Davis
- 👤 Keith R. Bartlett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:28
CPC Classifications
E; E02; E02D; E02D31/00; E02D31/02; E02D31/025; E02B; E02B11/00; E02D2200/00; E02D2200/16; E02D2300/00; E02D2300/0004; E02D2300/0025; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24174; Y10T428/24182; Y10T428/24273; Y10T428/24322
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
100 words
A subterranean drainage device comprising: a flexible polymeric core sheet having a major side thereof upon which are attached a plurality of generally T-shaped fin members arranged in spaced-apart rows and columns, said T-shaped fin members defining therebetween a conduit water passageway, wherein a continuous flow path is formed between said rows and columns, said core sheet comprising a first plane and said fin members comprising planar-extended fin top members disposed in a second plane parallel with said first plane; and fin body portions substantially perpendicular to said core sheet and connecting said fin top members to said core sheet.
Claim 2
Dependent Claim
100 words
A subterranean drainage device comprising: a flexible polymeric core sheet having a major side thereof upon which are attached a plurality of generally T-shaped fin members arranged in spaced-apart rows and columns, said T-shaped fin members defining therebetween a conduit water passageway, wherein a continuous flow path is formed between said rows and columns, said core sheet comprising a first plane and said fin members comprising planar-extended fin top members disposed in a second plane parallel with said first plane; and fin body portions substantially perpendicular to said core sheet and connecting said fin top members to said core sheet.
Claim 3
Dependent Claim
17 words
The drainage device of claim 1 further comprising a water-penetrable fabric attached to said T-shaped fin members.
Claim 4
Dependent Claim
29 words
The drainage device of claim 2 wherein said fin body portions have increased thickness at the point at which said fin body portions are connected to said core sheet.
Claim 5
Dependent Claim
15 words
The drainage device of claim 3 wherein said core sheet is comprised of thermoplastic material.
Claim 6
Dependent Claim
21 words
The drainage device of claim 4 wherein said core sheet and generally T-shaped fin members are extruded as an integral unit.
Claim 7
Dependent Claim
29 words
The drainage device of claim 5 further comprising an adhesive disposed on said core sheet opposite the major side upon which said planar-extended members and fin portions are disposed.
Claim 8
Dependent Claim
15 words
The drainage device of claim 6 further comprising a release sheet disposed over said adhesive.
Claim 9
Dependent Claim
34 words
The drainage device of claim 6 wherein said adhesive comprises an adhesive tape disposed on the major side of said core sheet opposite the major side upon which said T-shaped fin members are disposed.
Claim 10
Dependent Claim
42 words
The drainage device of claim 4 further comprising a waterproofing membrane disposed on a major side of said core sheet opposite the major side upon which said T-shaped fin members are disposed, said waterproofing membrane comprising a pressure-sensitive bituminous or synthetic adhesive.
Claim 11
Independent Claim
77 words
A method for fabricating a finned subterranean drainage device, comprising the steps of: extruding a continuous polymeric core member comprising a sheet from which fins, having generally T-shaped profiles, project from at least one major face of said extruded sheet; and thereafter removing a portion of said T-shapes at intervals along the machine direction in which the continuous sheet is extruded, whereby a plurality of individual T-shaped projections are arranged in rows and columns on said sheet.
Claim 12
Independent Claim
77 words
A method for fabricating a finned subterranean drainage device, comprising the steps of: extruding a continuous polymeric core member comprising a sheet from which fins, having generally T-shaped profiles, project from at least one major face of said extruded sheet; and thereafter removing a portion of said T-shapes at intervals along the machine direction in which the continuous sheet is extruded, whereby a plurality of individual T-shaped projections are arranged in rows and columns on said sheet.
Claim 13
Dependent Claim
17 words
The method of claim 10 further comprising the step of cutting to remove portions of said T-shapes.
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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) | 1996-11-22 | 1997-05-24 | 1997-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-22 | 2001-05-24 | 2001-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-22 | 2005-05-24 | 2005-11-23 | $7700.00 | Window Closed / Lapsed |