US3479803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pocket-type filter
Assignee: American Air Filter Co Inc
•
Filing: 1967-01-23
•
Granted: 1969-11-25
•
Expires: 1987-01-23
Abstract
No abstract record available.
Inventors
- 👤 Tom R Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:18
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/023
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US46944A
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US3124440A
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US3124441A
Cited
US2974432A
Cited
US2936855A
Cited
US3025964A
Cited
US3273321A
Cited
US3276190A
Cited
US3386232A
Cited
US3369348A
Cited
US3386231A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-24 | 1973-05-26 | 1973-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-24 | 1977-05-26 | 1977-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-24 | 1981-05-26 | 1981-11-25 | $7700.00 | Window Closed / Lapsed |