US3408818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capillary subterranean irrigation system
Assignee: Individual
•
Filing: 1966-06-06
•
Granted: 1968-11-05
•
Expires: 1986-06-06
Abstract
No abstract record available.
Inventors
- 👤 Lawrence F Hemphill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:18
CPC Classifications
E; E02; E02B; E02B13/00; A; A01; A01G; A01G25/00; A01G25/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1604189A
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US2084005A
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US2134647A
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US2653449A
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DE938850C
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US2763991A
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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) | 1971-11-05 | 1972-05-06 | 1972-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-05 | 1976-05-06 | 1976-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-05 | 1980-05-06 | 1980-11-05 | $7700.00 | Window Closed / Lapsed |