US3617545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removing urea from saline water solutions particularly in an artificial kidney
Assignee: Thales SA
•
Filing: 1970-03-12
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Granted: 1971-11-02
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Expires: 1990-03-12
Abstract
Abstract Urea is removed from ultrafiltrate or dialysate by demineralizing the saline solution thereof, hydrolyzing the urea to ammonium carbonate, removing the carbonate with a cationic exchange resin and then remineralizing the resulting solution. An electrodialyzer for employing this method is described.
Inventors
- 👤 Jean-Claude Dubois
- 👤 Claude Duchesne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:30
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; A; A61; A61M; A61M1/00; A61M1/14; A61M1/16; A61M1/1694; A61M1/1696; A61M1/34; A61M1/3472; A61M1/3486; B01D61/46; B01D61/461
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
30 words
The method of claim 1, wherein the product of (d) is contacted with an activated carbon, whereby any uric acid or creatinine present in said saline water solution is removed.
Claim 2
Dependent Claim
31 words
The method of claim 2, wherein the filtrate obtained in claim 2 is contacted with an anionic exchange resin, whereby phosphates and sulfates present in said saline water solution are removed.
Claim 3
Dependent Claim
21 words
The method of claim 1, wherein the urea of the demineralized solution is hydrolyzed with urease to ammonium carbonate in (b).
Claim 4
Dependent Claim
20 words
The method of claim 4, wherein the urease is enveloped in a capsule of a water-permeable plastic material in (b).
Claim 5
Dependent Claim
20 words
The method of claim 3, wherein the anionic exchange resin is one equilibrated with ions present in said saLine solution.
Claim 6
Dependent Claim
98 words
Apparatus for removing urea from blood comprising in combination a. an electrodialyzer comprising anode and cathode compartments separated by concentrating compartments which are separated by dilution compartments; b. means for charging a saline water solution containing urea to a dilution compartment of said electrodialyzer; c. a hydrolysis vessel and means for connecting the same with the exit of said dilution compartment; d. a column of cationic exchange resin and means for connecting the same with the exit of said hydrolysis vessel; e. and means connecting the exit of the column of (d) with concentrating compartments of said electrodialyzer.
Claim 7
Dependent Claim
24 words
Apparatus of claim 7, containing (f) a column of activated carbon and means for connecting the same with the exit of said concentrating compartments.
Claim 8
Dependent Claim
27 words
Apparatus of claim 8, containing (g) a column of an anionic exchange resin and means for connecting the same with the exit of said activated carbon column.
Claim 9
Dependent Claim
18 words
Apparatus of claim 9, wherein (c), (d), (e), (f) and (g) are contained in a single processing column.
Claim 10
Dependent Claim
14 words
Apparatus of claim 7, wherein the hydrolysis vessel contains a diaphragm which retains urease.
Claim 11
Dependent Claim
19 words
Apparatus of claim 9, wherein the anionic exchange resin is one equilibrated with ions present in said saline solution.
References Cited (Backward Citations)
US3268441A
Cited
US3463728A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |