Patent US2731152A successfully refreshed from Google Patents.
US2731152A
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US
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Filter element and method of manufacture
Assignee: General Filters Inc
•
Filing: 1949-03-14
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Granted: 1956-01-17
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Expires: 1969-03-14
Abstract
No abstract record available.
Inventors
- 👤 Arthur D Redner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:03
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D2201/00; B01D2201/18; B01D2201/182
Claims Analysis
Total Claims: 0
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US2468328A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-16 | 1959-07-18 | 1960-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-16 | 1963-07-18 | 1964-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-16 | 1967-07-18 | 1968-01-17 | $7700.00 | Window Closed / Lapsed |