US3393901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas scrubbing apparatus
Assignee: American Air Filter Co Inc
•
Filing: 1965-01-06
•
Granted: 1968-07-23
•
Expires: 1985-01-06
Abstract
No abstract record available.
Inventors
- 👤 Krause George Douglas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:55
CPC Classifications
B; B01; B01D; B01D47/00; B01D47/10; Y; Y10; Y10S; Y10S261/00; Y10S261/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB925711A
Cited
US3138647A
Cited
US3069146A
Cited
FR1381961A
Cited
FR1381962A
Cited
FR1381963A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-23 | 1972-01-22 | 1972-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-23 | 1976-01-22 | 1976-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-23 | 1980-01-22 | 1980-07-23 | $7700.00 | Window Closed / Lapsed |