Patent US4904112A successfully refreshed from Google Patents.
US4904112A
Expired / Lapsed
US
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Underground irrigation system
Assignee: AMERICAN MOISTURE CONTROL Inc
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Filing: 1989-07-26
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Granted: 1990-02-27
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Expires: 2009-07-26
Abstract
Abstract An inner pipe having a plurality of apertures on a top surface is connected to a pressurized water input source. The inner pipe is located within a slightly larger outer pipe and rests on a bottom inner surface of the outer pipe. The outer pipe is buried just below a plant root line. A series of longitudinal slots on a bottom portion of the outer pipe permits water flowing from the inner pipe to the outer pipe to trickle unimpeded into the surrounding soil.
Inventors
- 👤 Carroll W. McDonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:47
CPC Classifications
A; A01; A01G; A01G25/00; A01G25/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
182 words
An underground irrigation system comprising; an inner plastic cylindrical pipe impervious and inert to water connected to a pressurized water input source, the inner pipe having a plurality of apertures located on a top portion to permit flow of water from the interior to the exterior of the inner pipe, an outer cylindrical pipe slightly larger in interior diameter from an outer diameter of the inner pipe, the outer pipe being impervious to water and inert to soil chemicals enclosing the inner pipe, the inner pipe sealed at an end distal from the water input source to form a closed system, the outer pipe having a plurality of longitudinal slots located on a bottom portion with a bottom portion of the inner pipe resting on the bottom portion of the outer pipe, the outer pipe resting on an underground soil strata and being covered with soil, the slots permitting water to trickle from the outer pipe into the surrounding soil area which requires at least one pound per square inch pressure to be exerted on the water supply within the inner pipe.
Claim 2
Dependent Claim
182 words
An underground irrigation system comprising; an inner plastic cylindrical pipe impervious and inert to water connected to a pressurized water input source, the inner pipe having a plurality of apertures located on a top portion to permit flow of water from the interior to the exterior of the inner pipe, an outer cylindrical pipe slightly larger in interior diameter from an outer diameter of the inner pipe, the outer pipe being impervious to water and inert to soil chemicals enclosing the inner pipe, the inner pipe sealed at an end distal from the water input source to form a closed system, the outer pipe having a plurality of longitudinal slots located on a bottom portion with a bottom portion of the inner pipe resting on the bottom portion of the outer pipe, the outer pipe resting on an underground soil strata and being covered with soil, the slots permitting water to trickle from the outer pipe into the surrounding soil area which requires at least one pound per square inch pressure to be exerted on the water supply within the inner pipe.
Claim 3
Dependent Claim
45 words
The underground irrigation system according to claim 1 wherein a flow control disk is interposed between the water input source and an opening to the inner pipe so that water volume entering the inner pipe will be controlled by the pressure in the supply pipe.
Claim 4
Dependent Claim
17 words
The underground irrigation system according to claim 1 wherein the inner and outer pipes are polyvinyl chloride.
Claim 5
Dependent Claim
26 words
The underground irrigation system according to claim 3 wherein the inner pipe apertures are located at the top of the pipe and are spaced apart linearly.
Claim 6
Dependent Claim
22 words
The underground irrigation system according to claim 4 wherein the apertures are annular and have a diameter of 1/16 to 1/8 inches.
Claim 7
Dependent Claim
26 words
The underground irrigation system according to claim 1 wherein the outer pipe slots are located on each side of the bottom portion of the inner pipe.
Claim 8
Dependent Claim
17 words
The underground irrigation system according to claim 6 wherein the slots are about four inches in length.
Claim 9
Dependent Claim
151 words
An underground irrigation system comprising an inner cylindrical plastic moisture control pipe connected to a pressurized water input source with a flow control disc interposed between an opening to the inner pipe and the water input source, the inner pipe having a plurality of annular apertures, the apertures spaced apart in a linear pattern over a top surface of the inner pipe to permit water under at least one pound per square inch of pressure to flow from the inner pipe to an outer cylindrical plastic pipe enclosing the inner pipe sealed at each end, the inner pipe resting on an inner bottom surface of the outer pipe, a plurality of slots in a linear pattern along a bottom portion of the outer pipe and located adjacent to the inner pipe to permit water to trickle out of the outer pipe to surrounding soil in which the outer pipe is buried.
Claim 10
Dependent Claim
151 words
An underground irrigation system comprising an inner cylindrical plastic moisture control pipe connected to a pressurized water input source with a flow control disc interposed between an opening to the inner pipe and the water input source, the inner pipe having a plurality of annular apertures, the apertures spaced apart in a linear pattern over a top surface of the inner pipe to permit water under at least one pound per square inch of pressure to flow from the inner pipe to an outer cylindrical plastic pipe enclosing the inner pipe sealed at each end, the inner pipe resting on an inner bottom surface of the outer pipe, a plurality of slots in a linear pattern along a bottom portion of the outer pipe and located adjacent to the inner pipe to permit water to trickle out of the outer pipe to surrounding soil in which the outer pipe is buried.
Claim 11
Dependent Claim
46 words
The underground irrigation system according to claim 8 where the inner pipe has a coupler at each end and each coupler is attached to a nipple, a nipple at an end distal from the water input being end capped to close the inner moisture control pipe.
Claim 12
Dependent Claim
23 words
The underground irrigation system according to claim 8 wherein the apertures in the inner pipe have a diameter of less than 1/8 inch.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-26 | 1993-08-28 | 1994-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-26 | 1997-08-28 | 1998-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-26 | 2001-08-28 | 2002-02-27 | $7700.00 | Window Closed / Lapsed |