US4036747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adsorbent for recycling artificial kidney
Assignee: Takeda Pharmaceutical Co Ltd
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Filing: 1975-06-24
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Granted: 1977-07-19
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Expires: 1995-06-24
Abstract
Abstract Removal of uremic wastes, such as creatinine, uric acid, phosphates, etc., from the artificial kidney dialyzate is satisfactorily conducted by employing an adsorbent comprising activated carbon and gel-type alumina.
Inventors
- 👤 Masatake Hori
- 👤 Shintaro Kikuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:28
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/20; A; A61; A61M; A61M1/00; A61M1/14; A61M1/16; A61M1/1694; A61M1/1696
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
In a method for removing uremic wastes from dialyzed fluid in an artificial kidney of the recycle type which comprises treating artificial kidney dialyzate with an adsorbent, the improvement according to which the adsorbent consists essentially of activated carbon and gel-type alumina, the ratio of activated carbon to gel-type alumina being 10:1 to 10:10 by weight, the gel-type alumina employed being that produced by the process which comprises neutralizing an aqueous solution of an aluminum salt by the addition of an alkali, removing the salt formed and other solutes by aqueous washing to obtain an alumina sol, maintaining said sol in a hydrophobic medium under heating to thereby cause it to age into a gel and drying the said gel, the gel-type alumina containing silica in an amount of from 0 to 30% by weight.
Claim 2
Dependent Claim
135 words
In a method for removing uremic wastes from dialyzed fluid in an artificial kidney of the recycle type which comprises treating artificial kidney dialyzate with an adsorbent, the improvement according to which the adsorbent consists essentially of activated carbon and gel-type alumina, the ratio of activated carbon to gel-type alumina being 10:1 to 10:10 by weight, the gel-type alumina employed being that produced by the process which comprises neutralizing an aqueous solution of an aluminum salt by the addition of an alkali, removing the salt formed and other solutes by aqueous washing to obtain an alumina sol, maintaining said sol in a hydrophobic medium under heating to thereby cause it to age into a gel and drying the said gel, the gel-type alumina containing silica in an amount of from 0 to 30% by weight.
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) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |