Patent US3048276A successfully refreshed from Google Patents.
US3048276A
Expired / Lapsed
US
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Stack type filter construction
Assignee: DYNAMIC FILTERS Inc
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Filing: 1958-07-11
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Granted: 1962-08-07
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Expires: 1978-07-11
Abstract
No abstract record available.
Inventors
- 👤 Rex C Darnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:32
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/39; B01D29/41; B01D29/88; B01D29/90; B01D29/902; B01D29/908; B01D29/94
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US550583A
Cited
US630363A
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US1175948A
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US2068048A
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US2521107A
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US2797812A
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US2708521A
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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) | 1965-08-06 | 1966-02-05 | 1966-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-06 | 1970-02-05 | 1970-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-06 | 1974-02-05 | 1974-08-07 | $7700.00 | Window Closed / Lapsed |