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US2491912A
Expired / Lapsed
US
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Apparatus for separating materials
Assignee: Individual
•
Filing: 1947-01-30
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Granted: 1949-12-20
•
Expires: 1967-01-30
Abstract
No abstract record available.
Inventors
- 👤 Marcus A Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:07
CPC Classifications
B; B03; B03B; B03B11/00; B03B5/00; B03B5/28; B03B5/30; B03B5/36; B03B2011/008
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US455802A
Cited
US640400A
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US976943A
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US1085638A
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US1117897A
Cited
US1637986A
Cited
US1571675A
Cited
US2353152A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-19 | 1953-06-20 | 1953-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-19 | 1957-06-20 | 1957-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-19 | 1961-06-20 | 1961-12-20 | $7700.00 | Window Closed / Lapsed |