Patent US5611643A successfully refreshed from Google Patents.
US5611643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the construction of trenches
Assignee: Envirotrench
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Filing: 1995-08-10
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Granted: 1997-03-18
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Expires: 2015-08-10
Abstract
Abstract In the process for the construction of trenches in ground containing water and/or gas wherein a trench is due in said ground, support media is introduced in said trench to support the walls formed by the treching, vapor or water conduit means are placed in the trench and the trench with this support media is back-filled with particular material to dispose and remove the support media from the trench, the improvement comprising employing as said support media a hydrated cross linked acrylic polymer.
Inventors
- 👤 Gilbert R. Tallard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:38
CPC Classifications
E; E02; E02D; E02D17/00; E02D17/06; E02D17/12; B; B09; B09C; B09C1/00; B09C1/002; E02D19/00; E02D19/06; E02D19/12; E02D19/18; B09C2101/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
83 words
In the process for the construction of trenches in ground containing water and/or gas wherein a trench is dug in said ground, support media is introduced in said trench to support the walls formed by the trenching, vapor or water conduit means are placed in the trench and the trench with this support media is back-filled with particular material to dispose and remove the support media from the trench, the improvement comprising employing as said support media a hydrated cross linked acrylic polymer.
Claim 2
Dependent Claim
83 words
In the process for the construction of trenches in ground containing water and/or gas wherein a trench is dug in said ground, support media is introduced in said trench to support the walls formed by the trenching, vapor or water conduit means are placed in the trench and the trench with this support media is back-filled with particular material to dispose and remove the support media from the trench, the improvement comprising employing as said support media a hydrated cross linked acrylic polymer.
Claim 3
Dependent Claim
44 words
The improvement according to claim 1 wherein the cross linked acrylic polymer is selected from the group consisting of homopolymer of water-soluble acrylic acid salt, homopolymer of water-soluble methacrylic salts, homopolymer of acrylamide and copolymers of acrylamide and acrylic acid or methacrylic acid salts.
Claim 4
Dependent Claim
34 words
The improvement according to claim 2 wherein the cross linking is of a divinyl or diallyl compound so that the resulting polymer can be swollen with water but which will not dissolve in water.
Claim 5
Dependent Claim
22 words
The improvement according to claim 1 wherein the cross linked acrylic polymer is a copolymer or acrylamide and sodium acrylate or methacrylate.
Claim 6
Dependent Claim
73 words
The process for the construction of trenches in ground containing water and/or gas wherein a trench is dug in said ground, support media is introduced in said trench to support the walls formed by the trenching and the trench with the support media is back-filled with particular material to displace and remove the support media from the trench, the improvement comprising employing of said support media a hydrated crosslinked copolymer of acrylic acid.
Claim 7
Dependent Claim
73 words
The process for the construction of trenches in ground containing water and/or gas wherein a trench is dug in said ground, support media is introduced in said trench to support the walls formed by the trenching and the trench with the support media is back-filled with particular material to displace and remove the support media from the trench, the improvement comprising employing of said support media a hydrated crosslinked copolymer of acrylic acid.
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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) | 2000-03-17 | 2000-09-16 | 2001-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-03-17 | 2004-09-16 | 2005-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-03-17 | 2008-09-16 | 2009-03-18 | $7700.00 | Window Closed / Lapsed |