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Patent US3391809A successfully refreshed from Google Patents.
US3391809A
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US
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Silo bottom unloader system
Assignee: Individual
•
Filing: 1966-07-25
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Granted: 1968-07-09
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Expires: 1986-07-25
Abstract
No abstract record available.
Inventors
- 👤 Richard L Weaver
- 👤 Benjamin K Smoker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:58
CPC Classifications
A; A01; A01F; A01F25/00; A01F25/16; A01F25/20; A01F25/2018; B; B65; B65G; B65G65/00; B65G65/30; B65G65/34; B65G65/40; B65G65/46; B65G65/466
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1745716A
Cited
US3127032A
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US2969156A
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US2989946A
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US3121501A
Cited
US3208607A
Cited
US3214800A
Cited
US3237788A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-09 | 1972-01-08 | 1972-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-09 | 1976-01-08 | 1976-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-09 | 1980-01-08 | 1980-07-09 | $7700.00 | Window Closed / Lapsed |