US4051040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antithrombogenic hemo dialysis membranes
Assignee: Individual
•
Filing: 1976-03-17
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Granted: 1977-09-27
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Expires: 1996-03-17
Abstract
Abstract The present invention involves the partial carboxymethylation of cellulose to provide antithrombogenic characteristics when used as a hemo dialysis membrane. Partial carboxymethylation is obtained by reacting cellulose with an alkali chloroacetate.
Inventors
- 👤 James J. Hazdra
- 👤 David J. Rausch
- 👤 Karl O. Munninger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:05
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/08; B01D71/12; C; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/10; C08B11/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
34 words
An artificial kidney machine having a hemo dialysis cellulosic membrane containing alkali carboxymethylation to the extent of about 5 - 12 percent of that alkali carboxymethylation which may be theoretically incorporated in said membrane.
Claim 2
Dependent Claim
34 words
An artificial kidney machine having a hemo dialysis cellulosic membrane containing alkali carboxymethylation to the extent of about 5 - 12 percent of that alkali carboxymethylation which may be theoretically incorporated in said membrane.
Claim 3
Dependent Claim
34 words
A cell for subjecting blood to dialysis having a cellulosic dialysis surface containing alkali carboxymethylation to the extent of about 5-12 percent of that alkali carboxymethylation which may be theoretically incorporated into said surface.
Claim 4
Dependent Claim
34 words
A cell for subjecting blood to dialysis having a cellulosic dialysis surface containing alkali carboxymethylation to the extent of about 5-12 percent of that alkali carboxymethylation which may be theoretically incorporated into said surface.
Claim 5
Dependent Claim
20 words
A cell as described in claim 2 wherein said surface contains alkali carboxymethylation to the extent of about 8-10 percent.
Claim 6
Dependent Claim
16 words
A cell as described in claim 2 wherein said alkali carboxymethylation groups are sodium carboxymethylation groups.
References Cited (Backward Citations)
US3900463A
Cited
US3723413A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |