US2590342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air washer
Assignee: Individual
•
Filing: 1947-06-24
•
Granted: 1952-03-25
•
Expires: 1967-06-24
Abstract
No abstract record available.
Inventors
- 👤 Carl F Niehaus
- 👤 William G Niehaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:36
CPC Classifications
B; B01; B01D; B01D45/00; B01D45/12; B01D45/14; B01D47/00; B01D47/06; B01D47/08; B01D47/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US632370A
Cited
US831275A
Cited
US772655A
Cited
GB190725559A
Cited
US991157A
Cited
US1894864A
Cited
US1980522A
Cited
US2254600A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-25 | 1955-09-24 | 1956-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-25 | 1959-09-24 | 1960-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-25 | 1963-09-24 | 1964-03-25 | $7700.00 | Window Closed / Lapsed |