Patent US2638219A successfully refreshed from Google Patents.
US2638219A
Expired / Lapsed
US
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Material separating apparatus
Assignee: FARM PRODUCTION ENGINEERS Inc
•
Filing: 1950-03-13
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Granted: 1953-05-12
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Expires: 1970-03-13
Abstract
No abstract record available.
Inventors
- 👤 Elwin V Gordon
- 👤 Robert D Simpson
- 👤 Cardoza Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:56
CPC Classifications
B; B07; B07B; B07B7/00; B07B7/08; B07B7/086
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1897144A
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US969971A
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US1149463A
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US1367637A
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US1709848A
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US1660683A
Cited
US1724041A
Cited
US2128166A
Cited
DE676456C
Cited
US2354311A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |