Patent US3381679A successfully refreshed from Google Patents.
US3381679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilation and scrubbing assembly
Assignee: American Air Filter Co Inc
•
Filing: 1966-05-26
•
Granted: 1968-05-07
•
Expires: 1986-05-26
Abstract
No abstract record available.
Inventors
- 👤 Don J Gonzalez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:56
CPC Classifications
F; F24; F24C; F24C15/00; F24C15/20; B; B01; B01D; B01D47/00; B01D47/02; B01D47/025; Y; Y10; Y10S; Y10S55/00; Y10S55/36
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1741519A
Cited
US3221635A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-07 | 1971-11-06 | 1972-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-07 | 1975-11-06 | 1976-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-07 | 1979-11-06 | 1980-05-07 | $7700.00 | Window Closed / Lapsed |