US2529592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air circulating apparatus
Assignee: Westerlin & Campbell Co
•
Filing: 1945-07-21
•
Granted: 1950-11-14
•
Expires: 1965-07-21
Abstract
No abstract record available.
Inventors
- 👤 John R Boyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:19
CPC Classifications
F; F24; F24F; F24F11/00; F24F11/89
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2231826A
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US848803A
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US1390758A
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US1678654A
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US1719659A
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US1863949A
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US1793295A
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US1938797A
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US2000597A
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GB525222A
Cited
US2284161A
Cited
US2380935A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-13 | 1954-05-15 | 1954-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-13 | 1958-05-15 | 1958-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-13 | 1962-05-15 | 1962-11-14 | $7700.00 | Window Closed / Lapsed |