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US2445251A
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Mechanical rake classifier
Assignee: Individual
•
Filing: 1944-01-28
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Granted: 1948-07-13
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Expires: 1964-01-28
Abstract
No abstract record available.
Inventors
- 👤 Fred F Tessin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:04
CPC Classifications
B; B03; B03B; B03B5/00; B03B5/48; B03B5/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US492262A
Cited
US632360A
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US1173597A
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US1145316A
Cited
US1468844A
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US1777182A
Cited
US2293340A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-07-13 | 1952-01-12 | 1952-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-07-13 | 1956-01-12 | 1956-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-07-13 | 1960-01-12 | 1960-07-13 | $7700.00 | Window Closed / Lapsed |