US2539768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter element and method of making the same
Assignee: Cuno Engineered Products Inc
•
Filing: 1947-05-05
•
Granted: 1951-01-30
•
Expires: 1967-05-05
Abstract
No abstract record available.
Inventors
- 👤 Louis E Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:55
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2269725A
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US2395301A
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US2369488A
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US2321756A
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US2386684A
Cited
US2421704A
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US2383066A
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US2437265A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-29 | 1954-07-31 | 1955-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-29 | 1958-07-31 | 1959-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-29 | 1962-07-31 | 1963-01-30 | $7700.00 | Window Closed / Lapsed |