US2658624A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter
Assignee: General Filters Inc
•
Filing: 1948-08-07
•
Granted: 1953-11-10
•
Expires: 1968-08-07
Abstract
No abstract record available.
Inventors
- 👤 Arthur D Redner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:58
CPC Classifications
B; B01; B01D; B01D25/00; B01D25/22; B01D25/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US335040A
Cited
US893360A
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US1295006A
Cited
GB126447A
Cited
US1624689A
Cited
US1677892A
Cited
US1539116A
Cited
GB412100A
Cited
DE686434C
Cited
US2278453A
Cited
US2495095A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-09 | 1957-05-11 | 1957-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-09 | 1961-05-11 | 1961-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-09 | 1965-05-11 | 1965-11-10 | $7700.00 | Window Closed / Lapsed |