US3744256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid transfer
Assignee: ICI Fibres Ltd
•
Filing: 1972-03-20
•
Granted: 1973-07-10
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Expires: 1992-03-20
Abstract
Abstract Methods and systems of irrigation in which fluid is distributed via buried porous conduits to utilize conduits of non-woven fibrous material the porosity of which varies along the length of the conduits.
Inventors
- 👤 M Cobb
- 👤 T White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:56
CPC Classifications
A; A01; A01G; A01G25/00; A01G25/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
36 words
A method as in claim 1 wherein the porosity of the conduit increases from one end toward the other end, and wherein said other end is sealed and said one end is connected to the source.
Claim 2
Dependent Claim
26 words
A method as in claim 1 wherein the fluid to be distributed flows continuously from the source through the porous conduit and back to the source.
Claim 3
Dependent Claim
83 words
In a sub-surface system for distributing fluid into the ground, a buried flexible, non-rigid conduit constructed of non-woven fibrous material and defined by a continuously porous wall the porosity of which varies along its underground length so that controlled seepage of fluid may take place, said continuous porosity being achieved by a continuous uninterrupted variation in the compaction of the fibers of the conduit throughout its underground length, and means for connecting said conduit to a source of the fluid to be distributed.
Claim 4
Dependent Claim
47 words
A system as in claim 4 including a source of fluid to be distributed and wherein the porous conduit is supplied at one end with the fluid and has its other end sealed, the porosity of the conduit increasing from said one end toward said other end.
Claim 5
Dependent Claim
27 words
A system as in claim 4 including a source of fluid to be distributed and wherein said porous conduit is connected at both ends to the source.
Claim 6
Dependent Claim
19 words
A system as in claim 4 wherein a portion of the porous conduit is coated externally with fluid-impervious material.
Claim 7
Dependent Claim
18 words
A system as in claim 4 wherein said porous conduit is internally lined with a fluid permeable material.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |