US3440807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pocket-type filter cartridge and support structure assembly
Assignee: American Air Filter Co Inc
•
Filing: 1966-02-01
•
Granted: 1969-04-29
•
Expires: 1986-02-01
Abstract
No abstract record available.
Inventors
- 👤 William C Gaines Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:39
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; F; F24; F24F; F24F13/00; F24F13/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3124440A
Cited
US3124441A
Cited
US2502560A
Cited
US3087623A
Cited
US2980208A
Cited
US3058594A
Cited
US3161491A
Cited
US3326382A
Cited
US3360120A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-28 | 1972-10-28 | 1973-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-28 | 1976-10-28 | 1977-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-28 | 1980-10-28 | 1981-04-29 | $7700.00 | Window Closed / Lapsed |