US3511319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lift assist mechanism
Assignee: Deere and Co
•
Filing: 1968-01-02
•
Granted: 1970-05-12
•
Expires: 1988-01-02
Abstract
No abstract record available.
Inventors
- 👤 Harold Valentine Hansen
- 👤 Charles Harold Youngberg
- 👤 George Frederick Oelschlaeger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:11
CPC Classifications
A; A01; A01B; A01B73/00; A01B73/02; A01B73/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US768718A
Cited
US2218948A
Cited
GB557467A
Cited
US2803034A
Cited
US2709274A
Cited
US2972385A
Cited
US3067453A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-11 | 1973-11-10 | 1974-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-11 | 1977-11-10 | 1978-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-11 | 1981-11-10 | 1982-05-12 | $7700.00 | Window Closed / Lapsed |