US3705651A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter system employing activated carbon, porous material and diatomaceous earth
Assignee: SAMUEL H KLEIN
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Filing: 1971-09-10
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Granted: 1972-12-12
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Expires: 1991-09-10
Abstract
Abstract A disposable filter unit for consumer potable water consists of an inner core filled with activated carbon and surrounded by a body of porous material (fiber glass or asbestos) impregnated with diatomaceous earth. An outer layer of diatomaceous earth is formed on the porous material. The direction of water flow is inwardly through the outer materials to the core so that the carbon is arranged downstream of the other filtering materials.
Inventors
- 👤 Samuel H Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:41
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/001; C02F1/003; C02F9/00; C02F9/20; C01; C01B; C01B32/00; C01B32/30; C02F2201/00; C02F2201/002; C02F2201/006
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
102 words
A polishing filter device for potable water comprising a. a hollow, elongate, perforated core of rigid material chemically inert to water, b. a body of activated carbon within said core, c. a body of porous mineral material chemically inert to water surrounding said core, said porous material being impregnated with diatomaceous earth, d. a layer of diatomaceous earth on the outer surface of said impregnated material, e. and means for causing water to flow inwardly towards said core sequentially through said layer and said body of porous material, and subsequently into and along said core in contact with the activated carbon therein.
Claim 2
Dependent Claim
51 words
A self-contained, disposable filter unit comprising a polishing filter device according to claim 2 and an elongate, water tight housing containing said filter device, said housing having inlet and outlet means for connecting the unit in a potable water supply to cause the water therein to flow through said filter device.
Claim 3
Dependent Claim
13 words
The invention of claim 2, wherein said porous mineral material is fiber glass.
Claim 4
Dependent Claim
12 words
The invention of claim 2, wherein said porous mineral material is asbestos.
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) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |