Patent US4749306A successfully refreshed from Google Patents.
US4749306A
Expired / Lapsed
US
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Formed corrugated plastic net for drainage applications
Assignee: Leucadia Inc
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Filing: 1986-09-05
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Granted: 1988-06-07
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Expires: 2006-09-05
Abstract
Abstract Corrugated net thermoformed in a variety of differently shaped upstanding projections disposed on opposing surfaces of the netting to provide flow channels for draining ground water.
Inventors
- 👤 Darwin D. Demeny
- 👤 Robert C. Slocumb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:45
CPC Classifications
E; E02; E02B; E02B11/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
66 words
A drainage unit, comprising: a flow channel matrix including on one or both sides thereof a substantially co-extensive fabric-like filter material, the matrix comprising planar extruded thermoplastic netting sheet which has been deliberately shaped so as to provide a plurality of three-dimensional upstanding projections on the opposing surfaces thereof such that a three-dimensional drainage matrix of improved relatively high compressive resistance is provided for the unit.
Claim 2
Dependent Claim
66 words
A drainage unit, comprising: a flow channel matrix including on one or both sides thereof a substantially co-extensive fabric-like filter material, the matrix comprising planar extruded thermoplastic netting sheet which has been deliberately shaped so as to provide a plurality of three-dimensional upstanding projections on the opposing surfaces thereof such that a three-dimensional drainage matrix of improved relatively high compressive resistance is provided for the unit.
Claim 3
Dependent Claim
35 words
The drainage unit of claim 1 where the netting used for the matrix consists of a weight of about 150-200 pound/thousand square feet with about 6-12 strands per inch in the machine and transverse directions.
Claim 4
Dependent Claim
27 words
The drainage unit of claim 1 wherein the plastic netting for the matrix is selected from the group consisting of polyethylene, polypropylene, polystyrene, nylon and blends thereof.
Claim 5
Dependent Claim
17 words
The drainage unit of claim 1 in which the plastic for the matrix is high density polyethylene.
Claim 6
Dependent Claim
18 words
The drainage unit of claim 1 in which the projections take the form of elongated corrugations or channels.
Claim 7
Dependent Claim
23 words
The drainage unit of claim 5 wherein selected paired corrugations of the matrix are periodically interconnected by bridging deformed portions of the netting.
Claim 8
Dependent Claim
18 words
The drainage unit of claim 1 in which the thermoformed projections on the matrix are cusp-like in form.
Claim 9
Dependent Claim
20 words
The drainage unit of claim 7 in which the cusp-like projections of the matrix are arranged in a rectangular pattern.
Claim 10
Dependent Claim
19 words
The drainage unit of claim 13 in which the projections of each surface are off-set relative to each other.
References Cited (Backward Citations)
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Cited
JPS58143010A
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US4490072A
Cited
US4622138A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-07 | 1991-12-07 | 1992-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-07 | 1995-12-07 | 1996-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-07 | 1999-12-07 | 2000-06-07 | $7700.00 | Window Closed / Lapsed |