Patent US5788412A successfully refreshed from Google Patents.
US5788412A
Expired / Lapsed
US
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Method for in situ contaminant extraction from soil
Assignee: Individual
•
Filing: 1996-11-15
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Granted: 1998-08-04
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Expires: 2016-11-15
Abstract
Abstract The present invention involves heating of sub-surface soil by use of conduction heating intermediate the injection and extraction wells of a vacuum extraction system. This conduction heating is accomplished by implanting heat exchange units, such as a circulating hot oil system, into the soil between the injection and extraction wells.
Inventors
- 👤 Jayant Jatkar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:09
CPC Classifications
B; B09; B09C; B09C1/00; B09C1/005; B09C1/06; B09C2101/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
67 words
A method for the in situ removal of contaminants from sub-surface soil comprising the steps of: constructing an injection well; constructing an extraction well; constructing a heat exchange device inserted into the soil intermediate said injection well and said extraction well for heating the soil therebetween by thermal conduction, wherein said heat exchange device includes means for circulating heated fluid into thermal contact with said sub-surface soil.
Claim 2
Independent Claim
67 words
A method for the in situ removal of contaminants from sub-surface soil comprising the steps of: constructing an injection well; constructing an extraction well; constructing a heat exchange device inserted into the soil intermediate said injection well and said extraction well for heating the soil therebetween by thermal conduction, wherein said heat exchange device includes means for circulating heated fluid into thermal contact with said sub-surface soil.
Claim 3
Dependent Claim
34 words
The method for the in situ removal of contaminants from soil of claim 1 wherein said heat exchange device comprises piping inserted into said sub-surface soil and means to heat and circulate fluid therethrough.
Claim 4
Dependent Claim
20 words
The method for the in situ removal of contaminants from soil of claim 2 wherein said circulated fluid comprises oil.
References Cited (Backward Citations)
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US5169263A
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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) | 2001-08-03 | 2002-02-02 | 2002-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-08-03 | 2006-02-02 | 2006-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-08-03 | 2010-02-02 | 2010-08-04 | $7700.00 | Window Closed / Lapsed |