US2994977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Land leveling attachment for tractors
Assignee: EVERSMAN Manufacturing Co
•
Filing: 1958-12-31
•
Granted: 1961-08-08
•
Expires: 1978-12-31
Abstract
No abstract record available.
Inventors
- 👤 Lawrence E Shumaker
- 👤 Stanley E Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:30
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/76; E02F3/80; E02F3/84; E02F3/841; E02F3/7663; E02F3/7672
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2428857A
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US2536405A
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US2687681A
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US2722876A
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US2795060A
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US2815591A
Cited
US2886906A
Cited
US2870555A
Cited
US2862341A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-07 | 1965-02-06 | 1965-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-07 | 1969-02-06 | 1969-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-07 | 1973-02-06 | 1973-08-08 | $7700.00 | Window Closed / Lapsed |