US2437592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dust separator and filter
Assignee: Air Maze Corp
•
Filing: 1945-01-08
•
Granted: 1948-03-09
•
Expires: 1965-01-08
Abstract
No abstract record available.
Inventors
- 👤 Richard E Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:20
CPC Classifications
B; B04; B04C; B04C5/00; B04C5/14; B04C5/185; B04C5/187
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US844312A
Cited
US1323816A
Cited
US1513035A
Cited
US1818742A
Cited
US2152114A
Cited
US2085506A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-09 | 1951-09-08 | 1952-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-09 | 1955-09-08 | 1956-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-09 | 1959-09-08 | 1960-03-09 | $7700.00 | Window Closed / Lapsed |