Patent US2575894A successfully refreshed from Google Patents.
US2575894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air circulating apparatus
Assignee: Individual
•
Filing: 1948-04-09
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Granted: 1951-11-20
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Expires: 1968-04-09
Abstract
No abstract record available.
Inventors
- 👤 John I Shireman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:10
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/06; F24H3/08; F24H3/087
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US33849A
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US92490A
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US149439A
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US1719080A
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US1506121A
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US1840835A
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US1969829A
Cited
US1922144A
Cited
US2022333A
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US2089407A
Cited
FR837837A
Cited
US2268540A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-19 | 1955-05-21 | 1955-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-19 | 1959-05-21 | 1959-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-19 | 1963-05-21 | 1963-11-20 | $7700.00 | Window Closed / Lapsed |