Patent US5164087A successfully refreshed from Google Patents.
US5164087A
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US
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Leukocyte separator
Assignee: Terumo Corp
•
Filing: 1991-01-28
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Granted: 1992-11-17
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Expires: 2011-01-28
Abstract
Abstract A leukocyte separator for trapping and separating leukocytes from blood is made of a porous material having a bubble point ranging from 0.08 to 0.3 kg/cm 2 and a thickness of at least 0.30 mm. The leukocyte separator is manufactured by pressing a porous material having a bubble point smaller than 0.13 kg/cm 2 to produce a porous material having a thickness of at least 0.3 mm and a bubble point ranging from 0.13 to 0.3 kg/cm 2 .
Inventors
- 👤 Keiji Naoi
- 👤 Katsuhiko Iwata
- 👤 Osamu Kaneko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:38
CPC Classifications
A; A61; A61M; A61M1/00; A61M1/36; A61M1/3621; A61M1/3627; A61M1/3633; A61M1/34; A61M1/3472; B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1669; B01D39/1676; B01D69/00; B01D69/02; A61M2202/00; A61M2202/04; A61M2202/0413; A61M2202/0439; A61M2205/00; A61M2205/75; A61M2207/00; B01D2239/00; B01D2239/06; B01D2239/0604; B01D2239/0618; B01D2239/065; B01D2239/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
39 words
A leukocyte separator for trapping and separating leukocytes from blood, said leukocyte separator being made of a porous foamed plastic having a bubble point ranging from 0.08 to 0.3 kg/cm 2 and a thickness of at least 0.30 mm.
Claim 2
Dependent Claim
39 words
A leukocyte separator for trapping and separating leukocytes from blood, said leukocyte separator being made of a porous foamed plastic having a bubble point ranging from 0.08 to 0.3 kg/cm 2 and a thickness of at least 0.30 mm.
Claim 3
Dependent Claim
19 words
A leukocyte separator according to claim 1, wherein said bubble point ranges from 0.13 to 0.25 kg/cm 2 .
Claim 4
Dependent Claim
15 words
A leukocyte separator according to claim 1, wherein said thickness is at least 0.5 mm.
Claim 5
Dependent Claim
14 words
A leukocyte separator according to claim 1, wherein said porous material comprises polyvinyl alcohol.
Claim 6
Dependent Claim
14 words
A leukocyte separator according to claim 1, wherein said porous material comprises polyurethane foam.
Claim 7
Dependent Claim
16 words
A leukocyte separator according to claim 1 wherein the porosity thereof ranges from 50% to 90%.
Claim 8
Dependent Claim
23 words
A leukocyte separator according to claim 1, wherein said porous foamed plastic material is manufactured from synthetic rubber, thermoplastic resin, or thermosetting resin.
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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) | 1995-11-17 | 1996-05-18 | 1996-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-17 | 2000-05-18 | 2000-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-17 | 2004-05-18 | 2004-11-17 | $7700.00 | Window Closed / Lapsed |