Patent US4098660A successfully refreshed from Google Patents.
US4098660A
Expired / Lapsed
US
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Method of purifying water
Assignee: Sachs Systemtechnik GmbH
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Filing: 1977-06-28
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Granted: 1978-07-04
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Expires: 1997-06-28
Abstract
Abstract Water contaminated with pathogenic microorganisms is passed over a silver anode of an electrolyte cell in a layer 1 to 4 mm thick. The anode surface and the rate of water flow through the cell are related according to the equation F ≧ c × V, wherein F is the anode surface area in cm 2 , V is the water flow rate in cm 3 /second and c is a constant of the dimension sec/cm, with a value of 2 to 5. The density of the current in relation to the area of the anode surface is between 1.5 and 3.0 mA/cm 2 and the voltage is such that active oxygen is generated at the anode. The effluent from the cell is safe to drink.
Inventors
- 👤 Volker Eibl
- 👤 August Reis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:37
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/46; C02F1/461; C02F1/467; C02F1/4672; A; A61; A61L; A61L2/00; A61L2/02; A61L2/03; A61L2/035; C02F1/4606; C02F2303/00; C02F2303/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
150 words
A method of purifying water contaminated with microorganisms and having a specific resistance of approximately 0.5 × 10 3 ohm · cm to approximately 6.6 × 10 3 ohm · cm which comprises: (a) passing a stream of said water over a surface of conductive, silver-containing material, (1) the thickness of said stream at right angles to said surface being not greater than 4 millimeters; and (b) passing direct electric current between said surface as an anode and said contaminated water at a density of 1.5 to 3.0 mA per square centimeter of said surface, (1) the area F of said surface in square centimeters and the flow rate V of said stream in cm 3 /second satisfying the relationship F ≧ c × V, wherein c is a factor whose numerical value, in sec/cm, is at least equal to the numerical value of said thickness, in millimeters, plus one.
Claim 2
Independent Claim
150 words
A method of purifying water contaminated with microorganisms and having a specific resistance of approximately 0.5 × 10 3 ohm · cm to approximately 6.6 × 10 3 ohm · cm which comprises: (a) passing a stream of said water over a surface of conductive, silver-containing material, (1) the thickness of said stream at right angles to said surface being not greater than 4 millimeters; and (b) passing direct electric current between said surface as an anode and said contaminated water at a density of 1.5 to 3.0 mA per square centimeter of said surface, (1) the area F of said surface in square centimeters and the flow rate V of said stream in cm 3 /second satisfying the relationship F ≧ c × V, wherein c is a factor whose numerical value, in sec/cm, is at least equal to the numerical value of said thickness, in millimeters, plus one.
Claim 3
Dependent Claim
16 words
A method as set forth in claim 1, wherein said thickness is at least 1 mm.
Claim 4
Dependent Claim
33 words
A method as set forth in claim 2, wherein said direct electric current is generated by establishing a potential between said surface and said water sufficient to generate active oxygen at said surface.
Claim 5
Dependent Claim
17 words
A method as set forth in claim 2, wherein said thickness is not greater than 2 mm.
Claim 6
Dependent Claim
19 words
A method as set forth in claim 2, wherein the surface of said material contains at least 99% silver.
Claim 7
Dependent Claim
36 words
A method as set forth in claim 2, wherein said current is passed to said contaminated water from a surface of a cathode bounding said stream in a direction perpendicular to said surface of silver-containing material.
Claim 8
Dependent Claim
21 words
A method as set forth in claim 2, wherein said density is approximately 2.7 mA per square centimeter of said surface.
Claim 9
Dependent Claim
20 words
A method as set forth in claim 2, wherein turbulence is generated in said stream, said surface being substantially planar.
Claim 10
Dependent Claim
38 words
A method as set forth in claim 2, wherein said current is passed to said contaminated water from a cathode through a selectively permeable diaphragm bounding said stream in a direction perpendicular to said surface of silver-containing material.
Claim 11
Dependent Claim
31 words
A method as set forth in claim 1, wherein said numerical value of said factor c is not substantially greater than said numerical value of said thickness, in millimeters, plus one.
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) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |