US3568414A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning apparatus for fluid filters
Assignee: Donaldson Co Inc
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Filing: 1969-06-05
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Granted: 1971-03-09
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Expires: 1989-06-05
Abstract
Abstract AN ELONGATED SHAFT ADAPTED TO BE APPROXIMATELY COAXIALLY MOUNTED WITHIN A GENERALLY TUBUALR, PERMEABLE FLUID FILTER ELEMENT, SAID SHAFT HAVING RIGHT AND LEFT-HAND HELICAL CHANNELS FORMED THEREIN AND JOINED AT THE ENDS WITH GUIDE MEANS ENGAGED THEREIN FOR AXIAL RECIPROCAL MOVEMENTS ALONG SAID SHAFT UPON BEING ROTATED AROUND SAID SHAFT, A FLUID MOTOR FOR ROTATING SAID GUIDE MEANS, A NOZZLE AFFIXED TO SAID GUIDE MEANS FOR DIRECTING A JET OF FLUID IN A REVERSE DIRECTION THROUGH SAID FLUID FILTER AND FLEXIBLE CONDUIT MEANS CONNECTING SAID NOZZLE TO A SOURCE OF FLUID WHEREBY A JET OF FLUID IS MOVED IN A HELICAL PATH AROUND THE INNER SURFACE OF THE FILTER ELEMENT.
Inventors
- 👤 John R Spriggs
- 👤 Bernard A Matthys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:39
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/21; B01D29/62; B01D29/66; B01D29/68; B01D29/682; B01D29/70; B01D29/74; B01D41/00; B01D41/04; B01D46/24; B01D46/2403; B01D46/2411; B01D46/66; B01D46/70; B01D46/72; B01D2201/00; B01D2201/58; B01D2201/583
Claims Analysis
Total Claims: 0
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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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |