US3392831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw conveyor
Assignee: Individual
•
Filing: 1967-01-09
•
Granted: 1968-07-16
•
Expires: 1987-01-09
Abstract
No abstract record available.
Inventors
- 👤 Hans A Eckhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:22
CPC Classifications
B; B65; B65G; B65G65/00; B65G65/30; B65G65/34; B65G65/40; B65G65/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US430031A
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US1193016A
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US1128043A
Cited
US1617117A
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US2127726A
Cited
US2225215A
Cited
US2233707A
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US2455750A
Cited
US2493591A
Cited
US3178011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-16 | 1972-01-15 | 1972-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-16 | 1976-01-15 | 1976-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-16 | 1980-01-15 | 1980-07-16 | $7700.00 | Window Closed / Lapsed |