Patent US5259971A successfully refreshed from Google Patents.
US5259971A
Expired / Lapsed
US
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Method of preparing fibrinogen
Assignee: Artivion Inc
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Filing: 1992-03-02
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Granted: 1993-11-09
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Expires: 2012-03-02
Abstract
Abstract The present invention relates to a method of purifying native, intact fibrinogen from a liquid sample containing contaminants having molecular weights higher and/or lower than that of the fibrinogen. The method comprises subjecting the sample to filtration using one or more filters having a molecular weight cut-off such that the native, intact fibrinogen is separated from the contaminants.
Inventors
- 👤 Brenda Smith Morse
- 👤 Henry B. Kopf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:01
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/14; B01D61/147; A; A61; A61M; A61M1/00; A61M1/34; A61M1/36; A61M1/3601; A61M1/3603; C; C07; C07K; C07K14/00; C07K14/435; C07K14/745; C07K14/75; A61M2202/00; A61M2202/04; A61M2202/0413; A61M2202/0415; A61M2202/0445; A61M2202/0447; A61M2202/0449; Y; Y10; Y10T; Y10T436/00; Y10T436/25; Y10T436/25375; Y10T436/255
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
64 words
A method of purifying native, intact fibrinogen from a liquid sample containing a contaminant having a molecular weight less than that of said fibrinogen, which method comprises: subjecting said sample to filtration using a filter having a molecular weight cut-off such that said fibrinogen is retained by said filter and said contaminant passes through said filter; and removing said retained fibrinogen from said filter.
Claim 2
Independent Claim
64 words
A method of purifying native, intact fibrinogen from a liquid sample containing a contaminant having a molecular weight less than that of said fibrinogen, which method comprises: subjecting said sample to filtration using a filter having a molecular weight cut-off such that said fibrinogen is retained by said filter and said contaminant passes through said filter; and removing said retained fibrinogen from said filter.
Claim 3
Dependent Claim
12 words
The method according to claim 1 wherein said liquid sample is plasma.
Claim 4
Dependent Claim
26 words
The method according to claim 1 wherein said fibrinogen is cryoprecipitated or chemically precipitated from said sample and said precipitated fibrinogen redissolved prior to said filtration.
Claim 5
Dependent Claim
13 words
The method according to claim 1, wherein said filter is a polysulfone filter.
Claim 6
Dependent Claim
47 words
The method according to claim 1, wherein said fibrinogen retained by said filter is subjected to filtration using a second filter having a molecular weight cut-off such that fibrinogen passes through said second filter and proteins having a molecular weight greater than that of fibrinogen are retained.
Claim 7
Dependent Claim
22 words
The method according to claim 1 wherein said filter has a molecular weight cut-off in the range of 100,000 to 1,000,000 daltons.
Claim 8
Dependent Claim
18 words
The method according to claim 6 wherein said filter has a molecular weight cut-off of about 500,000 daltons.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-11-08 | 1997-05-10 | 1997-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-08 | 2001-05-10 | 2001-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-08 | 2005-05-10 | 2005-11-09 | $7700.00 | Window Closed / Lapsed |