Patent US3443690A successfully refreshed from Google Patents.
US3443690A
Expired / Lapsed
US
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Filtering apparatus
Assignee: Maschinenfabrik Sack GmbH
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Filing: 1968-08-08
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Granted: 1969-05-13
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Expires: 1988-08-08
Abstract
No abstract record available.
Inventors
- 👤 Josef Triesch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:05
CPC Classifications
B; B01; B01D; B01D37/00; B01D37/02; B01D21/00; B01D21/0012; B01D21/0018; B01D21/02; B01D21/24; B01D21/245; B01D21/2483; B01D29/00; B01D29/11; B01D29/114; B01D29/50; B01D29/52; B01D2201/00; B01D2201/04; B01D2201/043; B01D2201/0446; B01D2201/30; B01D2201/309
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-12 | 1972-11-11 | 1973-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-12 | 1976-11-11 | 1977-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-12 | 1980-11-11 | 1981-05-13 | $7700.00 | Window Closed / Lapsed |