Patent US4840515A successfully refreshed from Google Patents.
US4840515A
Expired / Lapsed
US
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Subterranean drain
Assignee: MIRAFI Inc 8702 RED OAK BLVD A CORP OF
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Filing: 1986-12-05
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Granted: 1989-06-20
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Expires: 2006-12-05
Abstract
Abstract A subterranean drainage unit for protecting a structure by intercepting subsurface fluid flows, comprising a sheet base member having parallel first and second planar surfaces, regularly spaced discrete frusto-conical members projecting from the first planar surface creating intersecting channels to allow for lateral and vertical uninterrupted flow of fluid, the second planar surface being constructed and arranged to cohesively adhere to the surface of the structure being protected and a filter media supported by the projections to maintain a substantially rigid surface which is non-interfering with the flow of fluid within the intersecting channels.
Inventors
- 👤 James S. Freese
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:12
CPC Classifications
E; E02; E02D; E02D31/00; E02D31/02; E02B; E02B11/00; E02B11/005; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24562; Y10T428/24628; Y10T428/24661
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
94 words
A subterranean drainage unit for protecting a structure by intercepting subsurface fluid flows, comprising a sheet base member having parallel first and second planar surfaces, regularly spaced discrete frusto-conical members projecting from said first planar surface members intersecting channels to allow for lateral and vertical uninterrupted flow of fluid, said second planar surface being constructed and arranged to cohesively adhere to the surface of said structure being protected and a filter media supported by said projections to maintain a substantially rigid surface which is non-interfering with the flow of fluid within said intersecting channels.
Claim 2
Dependent Claim
94 words
A subterranean drainage unit for protecting a structure by intercepting subsurface fluid flows, comprising a sheet base member having parallel first and second planar surfaces, regularly spaced discrete frusto-conical members projecting from said first planar surface members intersecting channels to allow for lateral and vertical uninterrupted flow of fluid, said second planar surface being constructed and arranged to cohesively adhere to the surface of said structure being protected and a filter media supported by said projections to maintain a substantially rigid surface which is non-interfering with the flow of fluid within said intersecting channels.
Claim 3
Dependent Claim
32 words
A subterranean drainage unit in accordance with claim 1 in which said conical members are provided with flat surfaces, substantially parallel to said first planar surface whereat said filter media is supported.
Claim 4
Dependent Claim
33 words
A subterranean drainage unit in accordance with claim 1 in which said conical member are of frusto-conical configuration allowing unimpeded flow in said channels and providing surfaces for bonding said filter media thereto.
Claim 5
Dependent Claim
31 words
A subterranean drainage unit in accordance with claim 1 in which said conical members are hollow providing for interlocking of like drainage units by male-female union of projections on said units.
Claim 6
Dependent Claim
19 words
A subterranean drainage unit in accordance with claim 1 in which the filter media is no-woven and water pervious.
Claim 7
Dependent Claim
22 words
A subterranean drainage unit in accordance with claim 1 in which a drainage means is provided and covered by said filter media.
Claim 8
Dependent Claim
29 words
A subterranean drainage unit in accordance with claim 6 in which said drainage means is a drain pipe having holes therein in the zones covered by said filter media.
Claim 9
Dependent Claim
29 words
A subterranean drainage unit in accordance with claim 1 in which holes are provided in said unit allowing liquid to flow from said second side to said first side.
Claim 10
Dependent Claim
20 words
A subterranean drainage unit in accordance with claim 8 in which filter media adjacent said second side covers said holes.
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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) | 1992-06-19 | 1992-12-19 | 1993-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-19 | 1996-12-19 | 1997-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-19 | 2000-12-19 | 2001-06-20 | $7700.00 | Window Closed / Lapsed |