Patent US2638218A successfully refreshed from Google Patents.
US2638218A
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US
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Method of separating dispersed matter from fluid masses
Assignee: FARM PRODUCTION ENGINEERS Inc
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Filing: 1949-11-21
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Granted: 1953-05-12
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Expires: 1969-11-21
Abstract
No abstract record available.
Inventors
- 👤 Robert D Simpson
- 👤 Elwin V Gordon
- 👤 Cardoza Frank
- 👤 John H Jacobs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:26
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
Cited
US1149463A
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US1355270A
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US1367635A
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US1660683A
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US2252581A
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US2373051A
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US2442522A
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 |