US2931364A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rod-shaped filter element
Assignee: Individual
•
Filing: 1957-11-22
•
Granted: 1960-04-05
•
Expires: 1977-11-22
Abstract
No abstract record available.
Inventors
- 👤 Mueller Paul Adolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:33
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; A; A24; A24D; A24D3/00; A24D3/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE177423C
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US269256A
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US2064239A
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GB380041A
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US2033867A
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US2202839A
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US2195201A
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GB639919A
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US2612966A
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CH288717A
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US2801638A
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US2820461A
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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) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |