US2631831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Evaporative cooler and humidifier
Assignee: Individual
•
Filing: 1950-09-22
•
Granted: 1953-03-17
•
Expires: 1970-09-22
Abstract
No abstract record available.
Inventors
- 👤 Raymond A Robic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:39
CPC Classifications
F; F24; F24F; F24F6/00; F24F6/02; F24F6/06; Y; Y10; Y10S; Y10S261/00; Y10S261/34
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) | 1956-03-16 | 1956-09-15 | 1957-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-16 | 1960-09-15 | 1961-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-16 | 1964-09-15 | 1965-03-17 | $7700.00 | Window Closed / Lapsed |