US2539344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air or gas cleaning apparatus
Assignee: Individual
•
Filing: 1945-04-06
•
Granted: 1951-01-23
•
Expires: 1965-04-06
Abstract
No abstract record available.
Inventors
- 👤 Thomas W Carraway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:55
CPC Classifications
B; B01; B01D; B01D47/00; B01D47/06; B08; B08B; B08B15/00; Y; Y10; Y10S; Y10S55/00; Y10S55/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1792590A
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US2242186A
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US1650292A
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US1840744A
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US1870196A
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US1888844A
Cited
US1960108A
Cited
US1965866A
Cited
US2057579A
Cited
US2171574A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-22 | 1954-07-24 | 1955-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-22 | 1958-07-24 | 1959-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-22 | 1962-07-24 | 1963-01-23 | $7700.00 | Window Closed / Lapsed |