US3404514A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screen cleaning device
Assignee: Allis Chalmers Corp
•
Filing: 1967-09-20
•
Granted: 1968-10-08
•
Expires: 1987-09-20
Abstract
No abstract record available.
Inventors
- 👤 Rector C Fergason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:01
CPC Classifications
F; F01; F01P; F01P11/00; F01P11/06; A; A01; A01D; A01D46/00; A01D46/08; F01P11/12; F01P2011/063
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2083812A
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US2352303A
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US2455734A
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US2601704A
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US2609064A
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US2827175A
Cited
US2854086A
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US3190817A
Cited
US3002585A
Cited
US3155473A
Cited
US3251175A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-08 | 1972-04-08 | 1972-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-08 | 1976-04-08 | 1976-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-08 | 1980-04-08 | 1980-10-08 | $7700.00 | Window Closed / Lapsed |