Patent US4662778A successfully refreshed from Google Patents.
US4662778A
Expired / Lapsed
US
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Drainage mat
Assignee: Monsanto Co
•
Filing: 1983-03-31
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Granted: 1987-05-05
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Expires: 2003-03-31
Abstract
Abstract Drainage mat comprising three-dimensional openwork covered on at least a major surface with a water permeable fabric having a permittivity from 0.2 seconds-1 to 2.0 seconds-1 and exhibiting a dynamic permeability after 106 loadings of at least 10-4 centimeters per second.
Inventors
- 👤 Barry J. Dempsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:41
CPC Classifications
E; E01; E01C; E01C13/00; E01C13/08; E01C11/00; E01C11/22; E01C11/224; E01C11/225; E01C11/227; E01C13/10; E01F; E01F5/00; E02; E02B; E02B11/00; Y; Y10; Y10T; Y10T428/00; Y10T428/23907; Y10T428/23914; Y10T428/23979
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
60 words
A drainage mat comprising: a three-dimensional openwork covered on at least a major surface with a water permeable fabric having a permittivity from 0.2 seconds -1 to 2.0 seconds -1 and exhibiting a dynamic permeability after 10 6 loadings of at least 10 -4 centimeters per second, such that said mat is resistant to soil pluggage from pulsing water flow.
Claim 2
Dependent Claim
60 words
A drainage mat comprising: a three-dimensional openwork covered on at least a major surface with a water permeable fabric having a permittivity from 0.2 seconds -1 to 2.0 seconds -1 and exhibiting a dynamic permeability after 10 6 loadings of at least 10 -4 centimeters per second, such that said mat is resistant to soil pluggage from pulsing water flow.
Claim 3
Dependent Claim
21 words
The drainage mat of claim 1 wherein said fabric has a permittivity from 0.5 seconds -1 to 1.0 seconds -1 .
Claim 4
Dependent Claim
30 words
The drainage mat of claim 2 which after from 1 to 10 6 loadings exhibits a dynamic permeability in the range of 10 -4 to 10 -2 centimeters per second.
Claim 5
Dependent Claim
23 words
The drainage mat of claim 2 wherein said three-dimensional openwork comprises a polymeric core having a plurality of fingers extending from a layer.
Claim 6
Dependent Claim
12 words
The drainage mat of claim 4 wherein the fingers are grass-like fingers.
Claim 7
Dependent Claim
13 words
The drainage mat of claim 5 wherein said fabric substantially envelops the core.
References Cited (Backward Citations)
US2076980A
Cited
US2945557A
Cited
US3323310A
Cited
US3507010A
Cited
US3573142A
Cited
US3563038A
Cited
US3830373A
Cited
US3765783A
Cited
US3654765A
Cited
US3965686A
Cited
US4057500A
Cited
US4288321A
Cited
US4182581A
Cited
NL7811388A
Cited
GB2040655A
Cited
EP0023871A1
Cited
US4309855A
Cited
BE893615A
Cited
GB2102041A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-04 | 1990-11-03 | 1991-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-04 | 1994-11-03 | 1995-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-04 | 1998-11-03 | 1999-05-05 | $7700.00 | Window Closed / Lapsed |