Patent US2404726A successfully refreshed from Google Patents.
US4009832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Irrigation means for the uniform distribution of liquid
Assignee: Individual
•
Filing: 1975-07-30
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Granted: 1977-03-01
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Expires: 1995-07-30
Abstract
Abstract A tube is provided with outlet apertures along its length and an internal flap adapted to throttle the flow of liquid through the apertures to an extent that is variable in response to the liquid pressure within the tube.
Inventors
- 👤 Uwe Tiedt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:14
CPC Classifications
A; A01; A01G; A01G25/00; A01G25/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
172 words
Irrigation means for the uniform distribution of a controlled quantity of liquid comprising a tube for receiving the liquid under pressure, said tube having a plurality of outlet apertures spaced lengthwise thereof, a flexible baffle strip arranged within said tube to underlie said apertures, said baffle strip extending lengthwise of said tube and being attached thereto at only one longitudinal side thereby forming an elongate flap, said flap having a first longitudinally extending portion containing said one attached longitudinal side and which extends up to and beneath said apertures and a second longitudinally extending portion containing a free opposite longitudinal side and which projects beyond said outlet apertures, said flap being spaced so as to conform generally to the cross-sectional contour of said tube so that said projecting second flap portion makes contact with said tube to define therewith a throttle gap through which the liquid flows to reach said outlet apertures, said throttle gap producing a flow resistance which is governed by the pressure of the liquid received in said tube.
Claim 2
Dependent Claim
172 words
Irrigation means for the uniform distribution of a controlled quantity of liquid comprising a tube for receiving the liquid under pressure, said tube having a plurality of outlet apertures spaced lengthwise thereof, a flexible baffle strip arranged within said tube to underlie said apertures, said baffle strip extending lengthwise of said tube and being attached thereto at only one longitudinal side thereby forming an elongate flap, said flap having a first longitudinally extending portion containing said one attached longitudinal side and which extends up to and beneath said apertures and a second longitudinally extending portion containing a free opposite longitudinal side and which projects beyond said outlet apertures, said flap being spaced so as to conform generally to the cross-sectional contour of said tube so that said projecting second flap portion makes contact with said tube to define therewith a throttle gap through which the liquid flows to reach said outlet apertures, said throttle gap producing a flow resistance which is governed by the pressure of the liquid received in said tube.
Claim 3
Dependent Claim
30 words
Irrigation means as defined in claim 1, wherein said tube includes a tubular wall and wherein said baffle strip is formed integrally in a one-piece construction with said tubular wall.
Claim 4
Dependent Claim
66 words
Irrigation means as defined in claim 2, wherein said baffle strip and said tubular wall are formed from a single strip of flexible material, said strip being provided with a first flange along one longitudinal edge and a second flange intermediate said one longitudinal edge and an opposite longitudinal edge, said strip being curled so that said flanges are in juxtaposition and secured to one another.
Claim 5
Dependent Claim
15 words
Irrigation means as defined in claim 3, wherein said flanges are shaped for interlocking engagement.
Claim 6
Dependent Claim
30 words
Irrigation means as defined in claim 3, including a rib formed on said strip intermediate said flanges so as to make substantially line contact with said projecting second flap portion.
Claim 7
Dependent Claim
17 words
Irrigation means as defined in claim 5, wherein said rib is provided with holes spaced-apart lengthwise thereof.
Claim 8
Dependent Claim
25 words
Irrigation means as defined in claim 6, wherein said holes in said rib are offset lengthwise of said flap with respect to said outlet apertures.
Claim 9
Dependent Claim
35 words
Irrigation means as defined in claim 3, including a plurality of spaced parallel ribs formed on said strip intermediate said flanges so that each rib makes substantially line contact with said projecting second flap portion.
Claim 10
Dependent Claim
18 words
Irrigation means as defined in claim 8, wherein each said rib is provided with holes spaced-apart lengthwise thereof.
Claim 11
Dependent Claim
24 words
Irrigation means as defined in claim 1, wherein said projecting second flap portion is shaped so as to make surface contact with said tube.
Claim 12
Dependent Claim
25 words
Irrigation means as defined in claim 1, wherein said projecting second flap portion is curved so as to make substantially line contact with said tube.
References Cited (Backward Citations)
US3080124A
Cited
US3567134A
Cited
US3698195A
Cited
US3779468A
Cited
US3874598A
Cited
US3797754A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-29 | 1980-08-30 | 1981-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-29 | 1984-08-30 | 1985-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-29 | 1988-08-30 | 1989-03-01 | $7700.00 | Window Closed / Lapsed |