US2643735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrugated screen gas impingement filter
Assignee: American Air Filter Co Inc
•
Filing: 1951-06-26
•
Granted: 1953-06-30
•
Expires: 1971-06-26
Abstract
No abstract record available.
Inventors
- 👤 Robert F Logsdon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:33
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D46/522; B01D46/10; B01D46/56; B01D46/58
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-29 | 1956-12-29 | 1957-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-29 | 1960-12-29 | 1961-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-29 | 1964-12-29 | 1965-06-30 | $7700.00 | Window Closed / Lapsed |