US3395518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filter with traveling filter-medium screen
Assignee: United States Steel Corp
•
Filing: 1966-12-28
•
Granted: 1968-08-06
•
Expires: 1986-12-28
Abstract
No abstract record available.
Inventors
- 👤 Bronnie F Krane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:57
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3127256A
Cited
US935359A
Cited
US1783181A
Cited
US2596518A
Cited
US2963158A
Cited
US3158455A
Cited
US3075333A
Cited
US3138088A
Cited
US3309847A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-06 | 1972-02-05 | 1972-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-06 | 1976-02-05 | 1976-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-06 | 1980-02-05 | 1980-08-06 | $7700.00 | Window Closed / Lapsed |