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US3426544A
Expired / Lapsed
US
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Aqua-tube sub-surface irrigation
Assignee: Individual
•
Filing: 1967-11-24
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Granted: 1969-02-11
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Expires: 1987-11-24
Abstract
No abstract record available.
Inventors
- 👤 Robert Curtis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:52
CPC Classifications
A; A01; A01G; A01G25/00; A01G25/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1165137A
Cited
US1254906A
Cited
US1484575A
Cited
GB414698A
Cited
US2536196A
Cited
US2763991A
Cited
US2817956A
Cited
US3220194A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-11 | 1972-08-12 | 1973-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-11 | 1976-08-12 | 1977-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-11 | 1980-08-12 | 1981-02-11 | $7700.00 | Window Closed / Lapsed |