US2431389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for humidifying and cleaning gaseous fluids such as air
Assignee: Individual
•
Filing: 1945-09-25
•
Granted: 1947-11-25
•
Expires: 1965-09-25
Abstract
No abstract record available.
Inventors
- 👤 Walter L Fleisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:58
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/12; B; B01; B01D; B01D50/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US494264A
Cited
US1042864A
Cited
US1988262A
Cited
US2137905A
Cited
US2197004A
Cited
US2356757A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-11-24 | 1951-05-26 | 1951-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-11-24 | 1955-05-26 | 1955-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-11-24 | 1959-05-26 | 1959-11-25 | $7700.00 | Window Closed / Lapsed |