Patent US2444147A successfully refreshed from Google Patents.
US2444147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid filter element
Assignee: Air Maze Corp
•
Filing: 1945-03-15
•
Granted: 1948-06-29
•
Expires: 1965-03-15
Abstract
No abstract record available.
Inventors
- 👤 George M Walton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:38
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/39; B01D29/41
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) | 1951-06-29 | 1951-12-29 | 1952-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-29 | 1955-12-29 | 1956-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-29 | 1959-12-29 | 1960-06-29 | $7700.00 | Window Closed / Lapsed |