US3407572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bag type filter apparatus and cleaning means therefor
Assignee: National Standard Co
•
Filing: 1967-03-07
•
Granted: 1968-10-29
•
Expires: 1987-03-07
Abstract
No abstract record available.
Inventors
- 👤 Tolley Derek Colin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:52
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/04; B01D46/42; B01D46/4272; B01D46/66; B01D46/74; B01D46/76
Claims Analysis
Total Claims: 0
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DE294465C
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-29 | 1972-04-29 | 1972-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-29 | 1976-04-29 | 1976-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-29 | 1980-04-29 | 1980-10-29 | $7700.00 | Window Closed / Lapsed |