Patent US4333870A successfully refreshed from Google Patents.
US4333870A
Expired / Lapsed
US
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Process for separating γ-globulin aggregate by polysulfone membrane
Assignee: Tosoh Corp
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Filing: 1980-09-17
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Granted: 1982-06-08
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Expires: 2000-09-17
Abstract
Abstract γ-Globulin aggregate is separated by a membrane from an aqueous solution of γ-globulin through an ultrafiltration membrane. The ultrafiltration membrane is a membrane made of a polysulfone resin having the formula ##STR1##
Inventors
- 👤 Kenji Koyama
- 👤 Syotaro Ohno
- 👤 Mitsutoshi Fukuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:37
CPC Classifications
C; C07; C07K; C07K16/00; C07K16/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
33 words
A process for separating γ-globulin aggregate by a membrane which comprises separating γ-globulin aggregate from an aqueous solution of γ-globulin through an ultrafiltration membrane made of a polysulfone resin having the formula ##STR4##
Claim 2
Dependent Claim
33 words
A process for separating γ-globulin aggregate by a membrane which comprises separating γ-globulin aggregate from an aqueous solution of γ-globulin through an ultrafiltration membrane made of a polysulfone resin having the formula ##STR4##
Claim 3
Dependent Claim
20 words
The process according to claim 1 wherein pH of said aqueous solution is in a range of 6 to 8.
Claim 4
Dependent Claim
25 words
The process according to claim 1 wherein the cutoff molecular weight of the ultrafiltration membrane is in range of 2×10 5 to 3.5×10 5 .
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) | 1985-06-07 | 1985-12-07 | 1986-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-07 | 1989-12-07 | 1990-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-07 | 1993-12-07 | 1994-06-08 | $7700.00 | Window Closed / Lapsed |