Patent US2706441A successfully refreshed from Google Patents.
US2706441A
Expired / Lapsed
US
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Attachment for rotary stalk cutter
Assignee: E L Caldwell & Sons
•
Filing: 1953-04-13
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Granted: 1955-04-19
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Expires: 1973-04-13
Abstract
No abstract record available.
Inventors
- 👤 Caldwell Frederick Clay
- 👤 Jr Edward Lasater Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:50
CPC Classifications
A; A01; A01D; A01D34/00; A01D34/001; A01D34/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US952826A
Cited
US1021573A
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US1778346A
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US2477442A
Cited
US2571455A
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US2651159A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-04-18 | 1958-10-18 | 1959-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-18 | 1962-10-18 | 1963-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-18 | 1966-10-18 | 1967-04-19 | $7700.00 | Window Closed / Lapsed |