US2463825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter element
Assignee: Individual
•
Filing: 1944-08-18
•
Granted: 1949-03-08
•
Expires: 1964-08-18
Abstract
No abstract record available.
Inventors
- 👤 Frederick W Strassheim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:29
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/50; B01D29/56; B01D29/58; B01D29/01; B01D29/05; B01D29/07
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US984704A
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US1015407A
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GB200577A
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US1863070A
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US1737313A
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GB401287A
Cited
US2023423A
Cited
FR803101A
Cited
US2220641A
Cited
US2297817A
Cited
US2304618A
Cited
US2332188A
Cited
US2372865A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-03-07 | 1952-09-06 | 1953-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-03-07 | 1956-09-06 | 1957-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-03-07 | 1960-09-06 | 1961-03-08 | $7700.00 | Window Closed / Lapsed |