US3733267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of filtration of dry cleaning fluid
Assignee: FREDERICK TAUSSIG US
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Filing: 1970-04-17
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Granted: 1973-05-15
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Expires: 1990-04-17
Abstract
Abstract A METHOD AND APPARATUS PARTICULARLY ADAPTED TO FILTERING LIQUID, CONSISTING OF, PREFERABLY, A DEEP-WALLED FIBERBAG OR SIMILAR PRE-FILTER, FOLLOWING BY ACROSS FLOW FILTER CARTRIDGE COMPRISING A PRIMARY FILTER, SURROUNDING A COARSE CLAY OR CLAY-CARBON ADSORBER UNIT CONTAINING HEATTREATED ATTAPULGITE PARTICLES OF ABOUT 6-25 MESH SIZE. A POST-FILTER CAN FILTER OUT MICROPARTICLES OF CLAY OR CARBON
Inventors
- 👤 G Haase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:58
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D24/00; B01D24/02; B01D24/04; B01D24/08; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/21; B01D29/216; B01D29/50; B01D29/52; B01D29/54; B01D29/56; B01D29/58; B01D46/0027; B01D46/0036; B01D46/24; B01D46/56; B01D46/62; B01D46/64; B01D53/00; B01D53/02; B01D53/04; B01D53/0407; B01D53/0415; B01D53/0431; B01D2253/00; B01D2253/10; B01D2253/102; B01D2253/106; B01D2253/11; B01D2253/30; B01D2253/302; B01D2253/304; B01D2267/00; B01D2267/40
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |