Patent US2778445A successfully refreshed from Google Patents.
US2778445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter with relief valve
Assignee: Air Maze Corp
•
Filing: 1954-10-29
•
Granted: 1957-01-22
•
Expires: 1974-10-29
Abstract
No abstract record available.
Inventors
- 👤 Jacob K Brixins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:10
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/24; B01D46/42; B01D46/4227; B01D46/4272; B01D46/66; B01D46/79; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7879; Y10T137/7888; Y10T137/7891; Y10T137/7892
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-22 | 1960-07-23 | 1961-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-22 | 1964-07-23 | 1965-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-22 | 1968-07-23 | 1969-01-22 | $7700.00 | Window Closed / Lapsed |