Patent US2516680A successfully refreshed from Google Patents.
US2516680A
Expired / Lapsed
US
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Apparatus for removing impurities from air
Assignee: Individual
•
Filing: 1945-05-11
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Granted: 1950-07-25
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Expires: 1965-05-11
Abstract
No abstract record available.
Inventors
- 👤 Oliver G Culpepper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:27
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/18; B01D46/66; B01D46/68; F; F24; F24F; F24F8/00; F24F8/10; F24F8/108; B01D2273/00; B01D2273/30; F24F2221/00; F24F2221/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US849061A
Cited
US996860A
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US1252472A
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US1375663A
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US1913885A
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US1638067A
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US1695784A
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US2109512A
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US1997826A
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US1838836A
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US2198449A
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US2311374A
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US2289700A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-24 | 1954-01-23 | 1954-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-24 | 1958-01-23 | 1958-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-24 | 1962-01-23 | 1962-07-25 | $7700.00 | Window Closed / Lapsed |