US4863312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underground leachate and pollutant drainage barrier system
Assignee: FINIC BV A CORP OF HOLLAND
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Filing: 1983-07-26
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Granted: 1989-09-05
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Expires: 2003-07-26
Abstract
Abstract A leachate and pollutant drainage barrier system is formed by excavating a narrow slit or slot in the earth in the presence of a reversable slurry mud which changes from a highly viscous character after a predetermined period of time (approximately 5-7 days) needed to maintain the trench open to permit the laying of a drainage pipe at the bottom of the trench and the filling of the trench with a pervious fill, such as gravel, etc. After the fill has been installed, lateral support for the earth walls is provided by the pervious fill material and the slurry reverts to a liquid having a substantially lower viscosity which may be drained via the drain pipe in the bottom of the trench. In a preferred embodiment the slurry is a biodegradable polymer. In addition, a plastic film or layer can be installed in the trench.
Inventors
- 👤 Nicholas J. Cavalli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:48
CPC Classifications
E; E02; E02D; E02D19/00; E02D19/06; E02D19/12; E02D19/18; B; B09; B09B; B09B1/00; E02D17/00; E02D17/13; E02D31/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
91 words
A method of constructing an underground leachate and pollutant drainage barrier system comprising the steps of, (a) excavating an elongated trench in the presence of a highly viscous excavation slurry which changes to a low viscosity after a predetermined period of time, (b) installing a pumping system extending to the bottom of said trench while said slurry is in the trench and before said slurry changes to its low viscosity character, and (c) filling said elongated trench with a pervious fill material before said slurry changes to its low viscosity character.
Claim 2
Independent Claim
91 words
A method of constructing an underground leachate and pollutant drainage barrier system comprising the steps of, (a) excavating an elongated trench in the presence of a highly viscous excavation slurry which changes to a low viscosity after a predetermined period of time, (b) installing a pumping system extending to the bottom of said trench while said slurry is in the trench and before said slurry changes to its low viscosity character, and (c) filling said elongated trench with a pervious fill material before said slurry changes to its low viscosity character.
Claim 3
Dependent Claim
59 words
The method defined in claim 1 further comprising (d) installing a drainage pipe coupled to said pumping system in the bottom of said trench prior to change of said slurry to a low viscosity and the filling of said trench with said pervious fill, and (e) draining said slurry from said trench through said drainage pipe and pumping system.
Claim 4
Dependent Claim
34 words
The invention defined in claim 2 including the step f) of installing a plastic film contiguous to and in abutment with one side of said trench before the filling thereof with said previous material.
Claim 5
Dependent Claim
18 words
The invention defined in claim 3 wherein said plastic film is installed in a plurality of panel sections.
Claim 6
Dependent Claim
29 words
The invention defined in claim 1 including the step f) of installing a plastic film adjacent one side of said trench before the filling thereof with said pervious material.
Claim 7
Dependent Claim
18 words
The invention defined in claim 5 wherein siad plastic film is installed in a plurality of panel sections.
Claim 8
Dependent Claim
13 words
The invention defined in claim 1 wherein said slurry is an organic polymer.
Claim 9
Dependent Claim
11 words
The invention defined in claim 1 wherein said slurry is biodegradable.
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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) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |