Patent US2500747A successfully refreshed from Google Patents.
US2500747A
Expired / Lapsed
US
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Dust separating and collecting machine
Assignee: Individual
•
Filing: 1946-01-05
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Granted: 1950-03-14
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Expires: 1966-01-05
Abstract
No abstract record available.
Inventors
- 👤 Robert P Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:17
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/24; B01D46/2403; B01D45/00; B01D45/12; B01D45/14; B01D46/0052; B01D46/0056; B01D46/42; B01D46/48; B01D46/66; B01D46/70; B01D46/71; B01D2273/00; B01D2273/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US519026A
Cited
DE353874C
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US1420665A
Cited
US1498061A
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US1580291A
Cited
DE620199C
Cited
US2244165A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |