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US2284447A
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US
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Assignee: General Filters Inc
•
Filing: 1937-11-15
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Granted: 1942-05-26
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Expires: 1957-11-15
Abstract
No abstract record available.
Inventors
- 👤 Arthur D Redner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:23
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/14; B01D27/00; B01D27/02; B01D27/10; B01D37/00; B01D37/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-05-25 | 1945-11-24 | 1946-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-05-25 | 1949-11-24 | 1950-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-05-25 | 1953-11-24 | 1954-05-26 | $7700.00 | Window Closed / Lapsed |