US3407608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subsurface irrigation system
Assignee: Individual
•
Filing: 1965-10-21
•
Granted: 1968-10-29
•
Expires: 1985-10-21
Abstract
No abstract record available.
Inventors
- 👤 Whitehead Brownloe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:37
CPC Classifications
A; A01; A01G; A01G25/00; A01G25/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
THE SUBSURFACE IRRIGATION SYSTEM WHICH COMPRISES: A CONDUIT BURIED IN THE SOIL HAVING WATER PERMEABLE WALLS WITH A HIGH RESISTANCE TO FLOW OF WATER THROUGH THE WALLS INTO THE SOIL, THE RESISTANCE BEING SUCH THAT FOR A GIVEN RANGE OF WATER PRESSURES WITHIN THE CONDUIT THE AVERAGE RATE OF FLOW THROUGH THE CONDUIT THE AVERAGE RATE PRESSURE DIFFERENTIAL ACROSS THE CONDUIT WALLS DUE TO THE INTERNAL PRESSURE AND THE EXTERNAL SOIL PRESSURE WILL BE SUBSTANTIALLY EQUAL TO THE AVERAGE RATE OF MOISTURE LOSS FROM THE SOIL FOR A GIVEN RANGE OF MOISTURE LOSS CONDITIONS, SAID WATER SUPPLY MEANS FOR AUTOMATICALY CONTINUALLY MAINTAINING A SUPPLY OF WATER IN THE CONDUIT AT A PRESELECTABLE CONSTANT PRESSURE UNDER CHANGING FLOW RATES THROUGH THE WALLS OF THE CONDUIT OVER AN EXTENDED PERIOD OF TIME DURING WHICH VARIATIONS IN SOIL MOISTURE CONDITIONS WILL NORMALLY OCCUR TO CAUSE SAID CHANGE IN FLOW RATES.
Claim 2
Dependent Claim
147 words
THE SUBSURFACE IRRIGATION SYSTEM WHICH COMPRISES: A CONDUIT BURIED IN THE SOIL HAVING WATER PERMEABLE WALLS WITH A HIGH RESISTANCE TO FLOW OF WATER THROUGH THE WALLS INTO THE SOIL, THE RESISTANCE BEING SUCH THAT FOR A GIVEN RANGE OF WATER PRESSURES WITHIN THE CONDUIT THE AVERAGE RATE OF FLOW THROUGH THE CONDUIT THE AVERAGE RATE PRESSURE DIFFERENTIAL ACROSS THE CONDUIT WALLS DUE TO THE INTERNAL PRESSURE AND THE EXTERNAL SOIL PRESSURE WILL BE SUBSTANTIALLY EQUAL TO THE AVERAGE RATE OF MOISTURE LOSS FROM THE SOIL FOR A GIVEN RANGE OF MOISTURE LOSS CONDITIONS, SAID WATER SUPPLY MEANS FOR AUTOMATICALY CONTINUALLY MAINTAINING A SUPPLY OF WATER IN THE CONDUIT AT A PRESELECTABLE CONSTANT PRESSURE UNDER CHANGING FLOW RATES THROUGH THE WALLS OF THE CONDUIT OVER AN EXTENDED PERIOD OF TIME DURING WHICH VARIATIONS IN SOIL MOISTURE CONDITIONS WILL NORMALLY OCCUR TO CAUSE SAID CHANGE IN FLOW RATES.
References Cited (Backward Citations)
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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) | 1971-10-29 | 1972-04-29 | 1972-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-29 | 1976-04-29 | 1976-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-29 | 1980-04-29 | 1980-10-29 | $7700.00 | Window Closed / Lapsed |