Patent US3608726A successfully refreshed from Google Patents.
US3608726A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid-filtering equipment
Assignee: ZF International UK Ltd
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Filing: 1969-03-17
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Granted: 1971-09-28
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Expires: 1989-03-17
Abstract
Abstract A filter has a cup-shaped housing, which includes a liquid inlet, and a lid which includes a liquid outlet. The liquid inlet opens tangentially into a groove around the interior of the mouth of the housing. A baffle covers the groove opening and itself has openings through which the liquid passes. A filter element is mounted centrally within the housing and is surrounded by a sleeve which directs the liquid entering through the baffle towards the closed end of the housing before it passes through the filter to the outlet.
Inventors
- 👤 Harold Crowther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:20
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/30; B01D21/00; B01D21/0012; B01D21/0024; B01D21/02; B01D21/26; B01D21/267; B01D29/00; B01D29/11; B01D29/114; B01D29/88; B01D29/90; B01D29/902; B01D29/908; B01D29/94; B01D35/14; B01D35/153; B01D2201/00; B01D2201/28; B01D2201/287; B01D2201/30; B01D2201/301
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
182 words
Liquid-filtering equipment comprising a casing constituted by a hollow body and a lid therefor, means for supporting a filter element within the casing, a liquid inlet and a liquid outlet in the casing, arranged so as to be separated, in use, by the filter element and a valve means between the filter element and the liquid outlet, the said valve means incorporating a seat-forming part of the filter element, a closure member supported by the filter element and engageable with the casing and a spring biasing the closure member towards the seat, the casing being adapted to be received in an opening in a support therefor with the liquid inlet and outlet passages in the casing respectively in communication with liquid inlet and outlet ports in the support, the arrangement being such that the casing can be removed from the support as a unit without disturbing the filter Element relative to the casing and further that the valve means is automatically shut to isolate the downstream side of the filter element for atmosphere when the filter element is removed from the casing.
Claim 2
Dependent Claim
182 words
Liquid-filtering equipment comprising a casing constituted by a hollow body and a lid therefor, means for supporting a filter element within the casing, a liquid inlet and a liquid outlet in the casing, arranged so as to be separated, in use, by the filter element and a valve means between the filter element and the liquid outlet, the said valve means incorporating a seat-forming part of the filter element, a closure member supported by the filter element and engageable with the casing and a spring biasing the closure member towards the seat, the casing being adapted to be received in an opening in a support therefor with the liquid inlet and outlet passages in the casing respectively in communication with liquid inlet and outlet ports in the support, the arrangement being such that the casing can be removed from the support as a unit without disturbing the filter Element relative to the casing and further that the valve means is automatically shut to isolate the downstream side of the filter element for atmosphere when the filter element is removed from the casing.
Claim 3
Dependent Claim
28 words
Liquid-filtering equipment as claimed in claim 1 in which the filter element comprises a perforated sleeve having flanges at the ends thereof which support an annular paper filter.
Claim 4
Dependent Claim
46 words
Liquid-filtering equipment as claimed in claim 1 in which the filter-element-supporting means comprises a spring-loaded locating member having a flange which sealingly engages one of the flanges of the filter element and urges the other flange of the filter element into sealing engagement with the lid.
Claim 5
Dependent Claim
22 words
Liquid-filtering equipment as claimed in claim 1 in which the lid is engaged on the body by means of a bayonet-type fastening.
Claim 6
Dependent Claim
19 words
Liquid-filtering equipment as claimed in claim 1 in which the casing is secured within the support by retaining means.
Claim 7
Dependent Claim
31 words
Liquid-filtering equipment as claimed in claim 5 in which the retaining means includes a plurality of threaded latch members pivotally mounted on the support and having nuts engageable with the casing.
Claim 8
Dependent Claim
28 words
Liquid-filtering equipment as claimed in claim 5 in which the retaining means includes a plurality of radially slidable bolts mounted on the lid and engageable in the support.
Claim 9
Dependent Claim
20 words
Liquid-filtering equipment as claimed in claim 7 in which the bolts are urged into their engaged positions by a cam.
Claim 10
Dependent Claim
24 words
Liquid-filtering equipment as claimed in claim 1 in which the liquid inlet communicates with a volute groove formed in the sidewall of the body.
Claim 11
Dependent Claim
17 words
Liquid-filtering equipment as claimed in claim 9 in which the liquid inlet enters the volute groove tangentially.
Claim 12
Dependent Claim
41 words
Liquid-filtering equipment as claimed in claim 1 in which the filter element includes a perforated sleeve and an annular filter surrounding the sleeve, the valve closure member being supported within the sleeve and being engageable with the lid of the casing.
Claim 13
Dependent Claim
35 words
Liquid-filtering equipment as claimed in claim 11 in which the valve means is provided at one end of the sleeve and which includes a closure element for shutting off the other end of the sleeve.
Claim 14
Dependent Claim
51 words
Liquid-filtering equipment as claimed in claim 12 in which the sleeve is formed at the said other end with a flange which has a portion extending inwardly of the sleeve and the closure element is biased into engagement with the said inwardly extending portion of the flange by the said spring.
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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |