Patent US5364533A successfully refreshed from Google Patents.
US5364533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for separating serum and plasma
Assignee: Sanwa Kagaku Kenkyusho Co Ltd
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Filing: 1992-07-14
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Granted: 1994-11-15
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Expires: 2012-07-14
Abstract
Abstract A process for separating and recovering serum and plasma components from a whole blood sample including passing a whole blood sample through a separating filter formed of a blood cell separating layer composed mainly of fibers impregnated with a coating agent. A device includes a blood collector having a needle at one end and a blood suction means at the other end, and a separating filter including a blood cell separating layer, the filter being provided in the intermediate zone of the blood collector, whereby a whole blood sample sucked through the needle by depressurizing the blood suction means is passed through the separating filter.
Inventors
- 👤 Shinji Ogura
- 👤 Hiroshi Okada
- 👤 Shizuo Uno
- 👤 Takashi Iida
- 👤 Hiromoto Asai
- 👤 Masayasu Kurono
- 👤 Kiichi Sawai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:36
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/483; G01N33/487; G01N33/49; G01N33/491; A; A61; A61B; A61B5/00; A61B5/15; A61B5/150007; A61B5/150015; A61B5/15003; A61B5/150206; A61B5/150236; A61B5/150251; A61B5/150374; A61B5/150381; A61B5/150473; A61B5/150496; A61B5/150732; A61B5/150755; A61B5/153; A61B5/154; B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/18; B01D39/20; B01D39/2003; B01D39/2017; A61B5/150389; B01D2239/00; B01D2239/04; B01D2239/0414; B01D2239/0464; B01D2239/0471; B01D2239/0492; B01D2239/12; B01D2239/1225; B01D2239/1233; B01D2239/1291; Y; Y10; Y10T; Y10T436/00; Y10T436/25; Y10T436/25375
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
74 words
A process for separating and recovering serum and plasma components from a whole blood sample, which comprises passing said whole blood sample through a separating filter formed of a blood cell separating layer composed mainly of fibers impregnated with a coating agent wherein said blood cell separating layer is made up of glass fibers having an average diameter 0.5 to 2.5 μm and said coating agent comprises a polyacrylic ester derivative and polyethylene glycol.
Claim 2
Dependent Claim
74 words
A process for separating and recovering serum and plasma components from a whole blood sample, which comprises passing said whole blood sample through a separating filter formed of a blood cell separating layer composed mainly of fibers impregnated with a coating agent wherein said blood cell separating layer is made up of glass fibers having an average diameter 0.5 to 2.5 μm and said coating agent comprises a polyacrylic ester derivative and polyethylene glycol.
Claim 3
Dependent Claim
49 words
A process as claimed in claim 1, wherein said polyacrylic ester derivative is selected from the group consisting of poly(butyl acrylate), poly(methyl acrylate) and poly(ethyl acrylate), and (a) poly(butyl acrylate), (b) poly(methyl acrylate) or poly(ethyl acrylate) and (c) polyethylene glycol are used in admixture at a ratio of (10-12):(1-4):(1-4).
References Cited (Backward Citations)
US3493503A
Cited
US3814079A
Cited
US4816224A
Cited
US4477575A
Cited
US4816224B1
Cited
US4477575B1
Cited
US4426295A
Cited
US4810394A
Cited
US4776959A
Cited
US5130231A
Cited
US4936993A
Cited
US5135719A
Cited
EP0283663A1
Cited
US4985543A
Cited
EP0295526A1
Cited
EP0305803A2
Cited
US5064541A
Cited
GB2232599A
Cited
US5000854A
Cited
US5066401A
Cited
US5244578A
Cited
EP0457183A1
Cited
JPH04187206A
Cited
US5186843A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-11-14 | 1998-05-16 | 1998-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-11-14 | 2002-05-16 | 2002-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-11-14 | 2006-05-16 | 2006-11-15 | $7700.00 | Window Closed / Lapsed |