US3500856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Irrigation system with driving chalk line
Assignee: J B KNIGHT CO Inc
•
Filing: 1967-08-23
•
Granted: 1970-03-17
•
Expires: 1987-08-23
Abstract
No abstract record available.
Inventors
- 👤 Ralph D Boone
- 👤 Rufus J Purtell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:35
CPC Classifications
A; A01; A01G; A01G25/00; A01G25/09; A01G25/092
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2604359A
Cited
US3001721A
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US3268174A
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US3281080A
Cited
US3334815A
Cited
US3302656A
Cited
US3353750A
Cited
US3406907A
Cited
US3386661A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-16 | 1973-09-15 | 1974-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-16 | 1977-09-15 | 1978-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-16 | 1981-09-15 | 1982-03-17 | $7700.00 | Window Closed / Lapsed |