US3766034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of ions from liquids
Assignee: WR Grace and Co Conn
•
Filing: 1972-08-01
•
Granted: 1973-10-16
•
Expires: 1992-08-01
Abstract
Abstract An electrolytic process for removing ionic substances from liquids wherein the liquid is contacted with a bed of reactive electrode particles. The electrode particles comprise a compound which will react with the ionic substance to be removed and may be coated with an ion-permeable membrane. The process finds particular utility in the removal of impurities from water.
Inventors
- 👤 P Veltman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:41
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/46; C02F1/461; C02F1/46104; C02F1/46109; C02F1/46114; C02F1/42; C02F1/469; C02F1/4691
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
10 words
The method of claim 1 wherein said liquid is water.
Claim 2
Dependent Claim
20 words
The method of claim 1 wherein said impurities are selected from the group consisting of phosphate, sulfate and chloride ions.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein said impurities are phosphate ions and said electrodes are aluminum metal particles coated with an ion-permeable membrane.
Claim 4
Dependent Claim
23 words
The method of claim 1 wherein said particulate electrodes are lead metal coated with an ion-permeable membrane and said impurities include sulfate ion.
Claim 5
Dependent Claim
24 words
The method of claim 1 wherein said particles are coated with a hydrophilic-polymer selected from the group consisting of polyurethanes and phenol-resorcinol-formaldehyde reaction products.
Claim 6
Dependent Claim
21 words
The method of claim 1 wherein said particulate electrodes are elongated and possess a cross-sectional diameter of at least 1 mm.
Claim 7
Dependent Claim
45 words
A particulate electrolytic apparatus which comprises: a. an electrolytic cell having a spaced anode and cathode surface; b. particulate reactive electrodes coated with an ion-permeable membrane placed between said anode and cathode surfaces; and c. means for impressing a direct current potential between said electrodes.
Claim 8
Dependent Claim
16 words
The apparatus of claim 1 wherein said electrodes comprise aluminum particles coated with an ion-permeable membrane.
Claim 9
Dependent Claim
17 words
The apparatus of claim 8 wherein said particulate electrodes comprise lead particles coated with an ion-permeable membrane.
Claim 10
Dependent Claim
25 words
The apparatus of claim 8 wherein said electrodes possess a length greater than their diameter and the cross-sectional diameter thereof is at least 1 mm.
References Cited (Backward Citations)
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US3149061A
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US3457152A
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US3692661A
Cited
US3716459A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |