US2502137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for cleaning and humidifying gaseous fluids such as air
Assignee: Individual
•
Filing: 1946-04-25
•
Granted: 1950-03-28
•
Expires: 1966-04-25
Abstract
No abstract record available.
Inventors
- 👤 Walter L Fleisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:27
CPC Classifications
F; F24; F24F; F24F6/00; F24F6/02; F24F6/04; Y; Y10; Y10S; Y10S261/00; Y10S261/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US871194A
Cited
FR515502A
Cited
US1791086A
Cited
US2137996A
Cited
US1846875A
Cited
US1952406A
Cited
US2431389A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-27 | 1953-09-26 | 1954-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-27 | 1957-09-26 | 1958-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-27 | 1961-09-26 | 1962-03-28 | $7700.00 | Window Closed / Lapsed |