US2689048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refillable filter
Assignee: Individual
•
Filing: 1950-01-11
•
Granted: 1954-09-14
•
Expires: 1970-01-11
Abstract
No abstract record available.
Inventors
- 👤 Milton A Powers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:40
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/30; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21; B01D29/216; B01D2201/00; B01D2201/04; B01D2201/0407
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR875941A
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US559440A
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US2511800A
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US148288A
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US1693741A
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US1941982A
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US2064511A
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US2218339A
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US2321985A
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US2250672A
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GB530116A
Cited
US2375765A
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US2354931A
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US2429321A
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US2463954A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-13 | 1958-03-15 | 1958-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-13 | 1962-03-15 | 1962-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-13 | 1966-03-15 | 1966-09-14 | $7700.00 | Window Closed / Lapsed |