US2575499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removable fibre glass filter
Assignee: Individual
•
Filing: 1949-03-10
•
Granted: 1951-11-20
•
Expires: 1969-03-10
Abstract
No abstract record available.
Inventors
- 👤 Max S Manow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:47
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10; F; F24; F24F; F24F13/00; F24F13/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1385502A
Cited
US1429811A
Cited
US1968436A
Cited
US2158966A
Cited
US2291383A
Cited
US2404807A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-19 | 1955-05-21 | 1955-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-19 | 1959-05-21 | 1959-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-19 | 1963-05-21 | 1963-11-20 | $7700.00 | Window Closed / Lapsed |