Patent US3428333A successfully refreshed from Google Patents.
US3428333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tow-type sectional automatically foldable harrow cart
Assignee: Individual
•
Filing: 1967-11-24
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Granted: 1969-02-18
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Expires: 1987-11-24
Abstract
No abstract record available.
Inventors
- 👤 Vern Eldon Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:44
CPC Classifications
A; A01; A01B; A01B73/00; A01B73/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2828597A
Cited
US2944615A
Cited
US2973818A
Cited
US2974737A
Cited
US3091296A
Cited
US3162494A
Cited
US3169027A
Cited
US3173497A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |