US3736075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump and filter unit
Assignee: SETHCO MANUF CORP
•
Filing: 1971-02-16
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Granted: 1973-05-29
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Expires: 1991-02-16
Abstract
Abstract A pump impeller is rotated by a motor through magnetically coupled driving and driven magnets. The driven magnet rotates with the impeller and is located in a chamber defined by a cupshaped partition interposed between the two magnets. The impeller draws dirty liquid through the pump inlet and delivers it to a filter housing in which the liquid is filtered. Through a passageway located between the driven magnet chamber and the pump inlet, filtered liquid is introduced into the driven magnet chamber; the filtered liquid also flows through the passageway to the pump inlet through a restricted opening surrounding the shaft on which the impeller and driven magnet are mounted. The pump drive motor, pump body, and filter housing are all axially aligned.
Inventors
- 👤 W J Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:55
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/26; F; F04; F04D; F04D13/00; F04D13/02; F04D13/021; F04D13/024; F04D13/026; F04D29/00; F04D29/08; F04D29/10; F04D29/14; F04D29/146; F04D29/58; F04D29/5806; F04D29/70; F04D29/708
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
188 words
A centrifugal pump and filter unit, comprising: a. a pump body having an inlet and an outlet; b. a rotatable impeller within said body between said inlet and outlet; c. filter means for receiving and filtering liquid from said outlet; d. means for rotating said impeller including a driven magnet rotatable with said impeller and a driving magnet magnetically coupled to said driven magnet; e. a partition separating said magnets and defining a chamber within which said driven magnet rotates; f. an auxiliary chamber betweeN said driven magnet chamber and said inlet; g. means for introducing into said auxiliary chamber filtered liquid from said filter means; h. means establishing communication between said auxiliary chamber and said driven magnet chamber, filtered liquid flowing through said means to fill said driven magnet chamber; and i. passageway means establishing communication between said auxiliary chamber and said inlet, filtered liquid flowing through said passageway means from said auxiliary chamber to said inlet in a direction away from said driven magnet chamber, so as to prevent unfiltered liquid flowing to said inlet from flowing through said passageway means to said driven magnet chamber.
Claim 2
Dependent Claim
188 words
A centrifugal pump and filter unit, comprising: a. a pump body having an inlet and an outlet; b. a rotatable impeller within said body between said inlet and outlet; c. filter means for receiving and filtering liquid from said outlet; d. means for rotating said impeller including a driven magnet rotatable with said impeller and a driving magnet magnetically coupled to said driven magnet; e. a partition separating said magnets and defining a chamber within which said driven magnet rotates; f. an auxiliary chamber betweeN said driven magnet chamber and said inlet; g. means for introducing into said auxiliary chamber filtered liquid from said filter means; h. means establishing communication between said auxiliary chamber and said driven magnet chamber, filtered liquid flowing through said means to fill said driven magnet chamber; and i. passageway means establishing communication between said auxiliary chamber and said inlet, filtered liquid flowing through said passageway means from said auxiliary chamber to said inlet in a direction away from said driven magnet chamber, so as to prevent unfiltered liquid flowing to said inlet from flowing through said passageway means to said driven magnet chamber.
Claim 3
Dependent Claim
50 words
A pump and filter unit as defined in claim 1 wherein said filter means includes a hollow cylindrical filter element, liquid to be filtered flowing from outside said filter element to its hollow interior, and said means (g) includes a liquid passageway communicating with the interior of said filter element.
Claim 4
Dependent Claim
57 words
A pump and filter unit as defined in claim 1 wherein said means (d) for rotating said impeller includes a motor having a shaft, said driving magnet being rotatable with said motor shaft, and wherein said filter means includes a filter housing accommodating a filter element, said motor, pump body, and filter housing all being axially aligned.
Claim 5
Dependent Claim
21 words
A pump and filter unit as defined in claim 1 wherein said filter means filters all the liquid leaving said outlet.
Claim 6
Dependent Claim
40 words
A pump and filter unit as defined in claim 1 wherein said means (d) for rotating said impeller includes a shaft upon which said impeller and driven magnet are mounted, said passageway means includes a restricted opening surrounding said shaft.
Claim 7
Dependent Claim
34 words
A pump and filter unit as defined in claim 1 wherein said magnets are annular and concentrically arranged, and said partition is cup shaped, the wall of said partition being interposed between said magnets.
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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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |