Patent US2556392A successfully refreshed from Google Patents.
US2556392A
Expired / Lapsed
US
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Screw conveyer apparatus
Assignee: Individual
•
Filing: 1948-01-29
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Granted: 1951-06-12
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Expires: 1968-01-29
Abstract
No abstract record available.
Inventors
- 👤 Elwin A Hawk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:12
CPC Classifications
B; B65; B65G; B65G33/00; B65G33/24; B65G33/34; B65G33/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US613748A
Cited
US1177792A
Cited
US1376084A
Cited
US1423371A
Cited
US2060569A
Cited
US2228840A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-11 | 1954-12-11 | 1955-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-11 | 1958-12-11 | 1959-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-11 | 1962-12-11 | 1963-06-12 | $7700.00 | Window Closed / Lapsed |