US2661933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Evaporative cooler for condensing hot compressed gas
Assignee: Niagara Blower Co
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Filing: 1952-02-25
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Granted: 1953-12-08
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Expires: 1972-02-25
Abstract
No abstract record available.
Inventors
- 👤 Charles N Deverall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:34
CPC Classifications
F; F28; F28D; F28D5/00; F28D5/02; F25; F25B; F25B2339/00; F25B2339/04; F25B2339/041
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-07 | 1957-06-08 | 1957-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-07 | 1961-06-08 | 1961-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-07 | 1965-06-08 | 1965-12-08 | $7700.00 | Window Closed / Lapsed |