Patent US3883428A successfully refreshed from Google Patents.
US3883428A
Expired / Lapsed
US
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Filter
Assignee: Individual
•
Filing: 1973-09-14
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Granted: 1975-05-13
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Expires: 1993-09-14
Abstract
Abstract An improved filter is described for use in filtering liquids where a typical use would be filling small water tanks as used on yachts or campers and the like. The filter includes a mechanical filter in the form of a knitted or woven cloth member positioned in series with a chemical filter comprising activated carbon. The cloth filter is positioned in advance of the carbon filter and is arranged so that it may stretch during the life of the filter to compensate for the accumulation of filtered particles within it. This stretching of the cloth filter causes its pores or openings to remain effective for a long period so that a continuing effective filtration is obtained long after a normal rigid mechanical filter would become stopped up and ineffective.
Inventors
- 👤 Robert W Waring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:56
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/001; C02F1/003; B; B01; B01D; B01D15/00; B01D29/00; B01D29/11; B01D29/114; B01D29/39; B01D29/50; B01D29/52; B01D29/88; B01D29/90; C02F2201/00; C02F2201/002; C02F2201/006
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
183 words
A LIQUID FILTER COMPRISING THE COMBINATION OF AN ELONGATED HOLLOW CASING HAVING A LIQUID INLET AND A LIQUID OUTLET AT ONE END THEREOF, AN ELONGATED INNER CHEMICAL FILTER ELEMENT COMPRISING AN IMPERFORATE SHEATH WITH ITS OPPOSITE ENDS OPEN AND FILLED WITH CHEMICAL FILTER MATERIAL, SAID INNER FILTER ELEMENT BEING POSITIONED WITHIN SAID CASING WITH ONE OPEN END OF THE SHEATH ADJACENT TO SAID INLET AND OUTLET AND COMMUNICATING ONLY WITH THE FILTER OUTLET AND HAVING THE SHEATH''S OPPOSITE OPEN END IN COMMUNICATION WITH THE INTERIOR OF THE HOLLOW CASING, A SPACE BETWEEN THE INNER FILTER SHEATH AND THE INNER SURFACE OF THE CASING IN COMMUNICATION WITH SAID FILTER INLET, A SECOND FILTER ELEMENT COMPRISING AN ELONGATED FIBROUS BOOT POSITIONED IN SAID SPACE ENGAGING THE INNER SURFACE OF THE CASING AND THE SHEATH OF SAID INNER FILTER AND FIXED AT SAID ONE OPEN END OF SAID SHEATH WHEREBY THE LIQUID FLOWS FROM SAID FILTER INLET THROUGH THE BOOT IN SAID SPACE AND THEREAFTER THROUGH THE SAID OPPOSITE OPEN END OF SAID INNER FILTER ELEMENT SHEATH AND THROUGH SAID CHEMICAL FILTER MATERIAL TO SAID OUTLET.
Claim 2
Dependent Claim
183 words
A LIQUID FILTER COMPRISING THE COMBINATION OF AN ELONGATED HOLLOW CASING HAVING A LIQUID INLET AND A LIQUID OUTLET AT ONE END THEREOF, AN ELONGATED INNER CHEMICAL FILTER ELEMENT COMPRISING AN IMPERFORATE SHEATH WITH ITS OPPOSITE ENDS OPEN AND FILLED WITH CHEMICAL FILTER MATERIAL, SAID INNER FILTER ELEMENT BEING POSITIONED WITHIN SAID CASING WITH ONE OPEN END OF THE SHEATH ADJACENT TO SAID INLET AND OUTLET AND COMMUNICATING ONLY WITH THE FILTER OUTLET AND HAVING THE SHEATH''S OPPOSITE OPEN END IN COMMUNICATION WITH THE INTERIOR OF THE HOLLOW CASING, A SPACE BETWEEN THE INNER FILTER SHEATH AND THE INNER SURFACE OF THE CASING IN COMMUNICATION WITH SAID FILTER INLET, A SECOND FILTER ELEMENT COMPRISING AN ELONGATED FIBROUS BOOT POSITIONED IN SAID SPACE ENGAGING THE INNER SURFACE OF THE CASING AND THE SHEATH OF SAID INNER FILTER AND FIXED AT SAID ONE OPEN END OF SAID SHEATH WHEREBY THE LIQUID FLOWS FROM SAID FILTER INLET THROUGH THE BOOT IN SAID SPACE AND THEREAFTER THROUGH THE SAID OPPOSITE OPEN END OF SAID INNER FILTER ELEMENT SHEATH AND THROUGH SAID CHEMICAL FILTER MATERIAL TO SAID OUTLET.
Claim 3
Dependent Claim
15 words
The liquid filter as claimed in claim 1 in which said hollow casing is transparent.
Claim 4
Dependent Claim
22 words
The liquid filter as claimed in claim 1 which further comprises a liquid flow control means in the inlet of the casing.
Claim 5
Dependent Claim
48 words
The liquid filter as claimed in claim 1 in which said casing has a decreasing diameter towards its other end whereby the annular space between the inner wall of the casing and the sheath of said chemical inner filter element narrows towards the other end of the casing.
Claim 6
Dependent Claim
18 words
The liquid filter as claimed in claim 1 in which said second filter element comprises a knitted boot.
Claim 7
Dependent Claim
18 words
The liquid filter as claimed in claim 1 in which said second filter element comprises a woven boot.
Claim 8
Dependent Claim
18 words
The liquid filter as claimed in claim 1 in which said inner chemical filter comprises activated carbon granules.
References Cited (Backward Citations)
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US3289847A
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US3322279A
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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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |