US2637532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fan type heat exchanger
Assignee: Individual
•
Filing: 1951-03-31
•
Granted: 1953-05-05
•
Expires: 1971-03-31
Abstract
No abstract record available.
Inventors
- 👤 Augustus L Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:29
CPC Classifications
F; F28; F28D; F28D1/00; F28D1/02; F28D1/0233; F28D1/024
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2031220A
Cited
US2005615A
Cited
US2229304A
Cited
US2337518A
Cited
US2401918A
Cited
US2503764A
Cited
US2464473A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-04 | 1956-11-03 | 1957-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-04 | 1960-11-03 | 1961-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-04 | 1964-11-03 | 1965-05-05 | $7700.00 | Window Closed / Lapsed |