Patent US3437208A successfully refreshed from Google Patents.
US3437208A
Expired / Lapsed
US
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Apparatus for dynamic filtration of liquids
Assignee: Individual
•
Filing: 1964-10-21
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Granted: 1969-04-08
•
Expires: 1984-10-21
Abstract
No abstract record available.
Inventors
- 👤 Jan Kaspar
- 👤 Josef Soudek
- 👤 Karel Gutwirth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:47
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/26; B01D33/00; B01D33/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US364933A
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US509441A
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US1264635A
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US1262146A
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GB324924A
Cited
US2332965A
Cited
US2416524A
Cited
US3190449A
Cited
US3178021A
Cited
US3241675A
Cited
US3157598A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-07 | 1972-10-07 | 1973-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-07 | 1976-10-07 | 1977-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-07 | 1980-10-07 | 1981-04-08 | $7700.00 | Window Closed / Lapsed |