Patent US2691333A successfully refreshed from Google Patents.
US2691333A
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US
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Apparatus for blocking row crops
Assignee: EVERSMAN Manufacturing Co
•
Filing: 1948-04-15
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Granted: 1954-10-12
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Expires: 1968-04-15
Abstract
No abstract record available.
Inventors
- 👤 Lawrence E Shumaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:17
CPC Classifications
A; A01; A01B; A01B41/00; A01B41/04; Y; Y10; Y10S; Y10S172/00; Y10S172/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2028450A
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US2516794A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-11 | 1958-04-12 | 1958-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-11 | 1962-04-12 | 1962-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-11 | 1966-04-12 | 1966-10-12 | $7700.00 | Window Closed / Lapsed |