US3974070A
Expired / Lapsed
US
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Process for purifying tap water
Assignee: Individual
•
Filing: 1975-01-20
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Granted: 1976-08-10
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Expires: 1995-01-20
Abstract
Abstract A process for purifying tap water which comprises filtering water containing impurities flocculated by a metal hydroxide produced electrolytically, through a layer of a solid water-insoluble granular material. On said layer, in the direction of water flow, a layer of a metal hydroxide is deposited through which the water to be purified is passed. The water thus purified is substantially free from impurities and may be useful in the electronics, medical, food and other industries.
Inventors
- 👤 Igor Vasilievich Popov
- 👤 Gely Romanovich Bochkarev
- 👤 Vitaly Fedorovich Lebedev
- 👤 Feaor Anisimovich Baryshnikov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:30
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/20; C02F1/28; C02F1/281; C02F1/46; C02F1/461; C02F1/463; C02F2103/00; C02F2103/02; C02F2103/026; C02F2103/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
118 words
A process for purifying tap water consisting of the steps of: adsorbing finely dispersed impurities contained in the water being treated by a flocculating agent consisting of ferric hydroxide, the ferric hydroxide being produced electrolytically with at least one iron anode, said water having a pH of from 7.2 to 8.2, and said ferric hydroxide being deposited as a layer on a layer of a solid water-insoluble granular material having a grain size of from 0.25 to 3 mm and selected from the group consisting of sulphocarbon, anthracite and mixtures thereof; and filtering the water through the layer of ferric hydroxide and the layer of solid water-insoluble granular material at a speed of not more than 3 m/hr.
Claim 2
Dependent Claim
118 words
A process for purifying tap water consisting of the steps of: adsorbing finely dispersed impurities contained in the water being treated by a flocculating agent consisting of ferric hydroxide, the ferric hydroxide being produced electrolytically with at least one iron anode, said water having a pH of from 7.2 to 8.2, and said ferric hydroxide being deposited as a layer on a layer of a solid water-insoluble granular material having a grain size of from 0.25 to 3 mm and selected from the group consisting of sulphocarbon, anthracite and mixtures thereof; and filtering the water through the layer of ferric hydroxide and the layer of solid water-insoluble granular material at a speed of not more than 3 m/hr.
Claim 3
Dependent Claim
18 words
The process as claimed in claim 1, wherein the electrolysis is performed using additional anodes which are non-oxidizable.
Claim 4
Dependent Claim
16 words
The process as claimed in claim 1, wherein the solid water-insoluble granular material consists of sulphocarbon.
Claim 5
Dependent Claim
16 words
The process as claimed in claim 1, wherein the solid water-insoluble granular material consists of anthracite.
Claim 6
Dependent Claim
21 words
The process as claimed in claim 1, wherein the solid water-insoluble granular material consists of a mixture of anthracite and sulphocarbon.
Claim 7
Dependent Claim
118 words
A process for purifying tap water consisting of the steps of: adsorbing finely dispersed impurities contained in the water being treated by a flocculating agent consisting of aluminium hydroxide, the aluminium hydroxide being produced electrolytically with at least one aluminium anode, said water having a pH of from 5 to 7, and said aluminium hydroxide being deposited as a layer on a layer of a solid, water-insoluble granular material having a grain size of from 0.25 to 3 mm and selected from the group consisting of sulphocarbon, anthracite and mixtures thereof; and filtering the water through the layer of aluminium hydroxide and the layer of solid water-insoluble granular material at a speed of not more than 3 m/hr.
Claim 8
Dependent Claim
118 words
A process for purifying tap water consisting of the steps of: adsorbing finely dispersed impurities contained in the water being treated by a flocculating agent consisting of aluminium hydroxide, the aluminium hydroxide being produced electrolytically with at least one aluminium anode, said water having a pH of from 5 to 7, and said aluminium hydroxide being deposited as a layer on a layer of a solid, water-insoluble granular material having a grain size of from 0.25 to 3 mm and selected from the group consisting of sulphocarbon, anthracite and mixtures thereof; and filtering the water through the layer of aluminium hydroxide and the layer of solid water-insoluble granular material at a speed of not more than 3 m/hr.
Claim 9
Dependent Claim
18 words
The process as claimed in claim 6, wherein the electrolysis is performed using additional anodes which are non-oxidizable.
Claim 10
Dependent Claim
16 words
The process as claimed in claim 6, wherein the solid water-insoluble granular material consists of sulphocarbon.
Claim 11
Dependent Claim
16 words
The process as claimed in claim 6, wherein the solid water-insoluble granular material consists of anthracite.
Claim 12
Dependent Claim
21 words
The process as claimed in claim 6, wherein the solid water-insoluble granular material consists of a mixture of anthracite and sulphocarbon.
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) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |