US4662778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drainage mat
Assignee: Monsanto Co
•
Filing: 1983-03-31
•
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 10:08
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.
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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) | 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 |