Patent US3685298A successfully refreshed from Google Patents.
US3685298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drainer
Assignee: Individual
•
Filing: 1970-11-23
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Granted: 1972-08-22
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Expires: 1990-11-23
Abstract
Abstract A subsoil drainer for draining seepage water, in which an elongated member has at least three radially projecting continuous ribs and continuous integral cross pieces on at least two of the radially projecting ribs. The drainer may be installed in subsoil singly or bunched together with like members to provide a quick and unblocked drainage of seepage water especially in reclaimed land.
Inventors
- 👤 Michinobu Takanashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:49
CPC Classifications
E; E02; E02B; E02B11/00; E02B11/005
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
89 words
An elongated drainer for sub-soil use for draining seepage liquids, comprising an elongated body having at least three radially projecting continuous ribs, each rib being provided with a crosspiece which extends continuously throughout the length of the rib inwardly of the outer end of the rib, each crosspiece having a portion extending substantially perpendicularly from each face of the rib, and there being a clearance between adjacent crosspieces which leads to a channel provided between adjacent ribs providing a flow path for the liquid lengthwise of the elongated body.
Claim 2
Dependent Claim
89 words
An elongated drainer for sub-soil use for draining seepage liquids, comprising an elongated body having at least three radially projecting continuous ribs, each rib being provided with a crosspiece which extends continuously throughout the length of the rib inwardly of the outer end of the rib, each crosspiece having a portion extending substantially perpendicularly from each face of the rib, and there being a clearance between adjacent crosspieces which leads to a channel provided between adjacent ribs providing a flow path for the liquid lengthwise of the elongated body.
Claim 3
Dependent Claim
19 words
The drainer as claimed in claim 1 in which said body, ribs and crosspieces are of a synthetic resin.
Claim 4
Dependent Claim
19 words
The drainer as claimed in claim 2 in which said body, ribs and crosspieces are of extruded flexible polyethylene.
Claim 5
Dependent Claim
19 words
The drainer as claimed in claim 2 in which said body, ribs and crosspieces are of extruded flexible acrylonitrile-polyethylene.
Claim 6
Dependent Claim
20 words
A sub-soil seepage drainer-assembly, comprising a plurality of drainers as claimed in claim 1, arranged in a bundled longitudinal assembly.
Claim 7
Dependent Claim
21 words
A sub-soil seepage drainer assembly comprising a plurality of drainers as claimed in claim 1, arranged in longitudinally adjacent abutting relation.
References Cited (Backward Citations)
US1998017A
Cited
US3086627A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |