US5234593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter for purification of platelets
Assignee: Terumo Corp
•
Filing: 1990-09-13
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Granted: 1993-08-10
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Expires: 2010-09-13
Abstract
Abstract A filter for the purification of platelets by dint of selective removal of leucocytes as extraneous matter from blood components, which filter has as a main part thereof a porous body possessing a three-dimensional reticularly continuous texture containing continuous open pores 6 to 12 μm in average diameter and allowing substantially no presence of acute projection inside said pores.
Inventors
- 👤 Hitoshi Kuroki
- 👤 Shinichiro Kuroda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:12
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1669; B01D39/1676; A; A61; A61M; A61M2202/00; A61M2202/04; A61M2202/0413; A61M2202/0427; A61M2202/0439
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
115 words
A filter for the purification of platelets by dint of selective removal of leucocytes as extraneous matter from blood components, which filter includes a porous body possessing a three-dimensional reticularly continuous texture containing continuous open pores having an average diameter in the range of 6 to 12 μm, an average pore diameter distribution in the range of 2 μm to 30 μm and substantially no acute projections inside said pores, said average diameter being determined by a mercury injection method and being defined as the diameter of the pores at which the percentage of pores having a presence of injected mercury becomes 50%, assuming the percentage of pores into which mercury is injected is 100%.
Claim 2
Dependent Claim
115 words
A filter for the purification of platelets by dint of selective removal of leucocytes as extraneous matter from blood components, which filter includes a porous body possessing a three-dimensional reticularly continuous texture containing continuous open pores having an average diameter in the range of 6 to 12 μm, an average pore diameter distribution in the range of 2 μm to 30 μm and substantially no acute projections inside said pores, said average diameter being determined by a mercury injection method and being defined as the diameter of the pores at which the percentage of pores having a presence of injected mercury becomes 50%, assuming the percentage of pores into which mercury is injected is 100%.
Claim 3
Dependent Claim
20 words
A filter according to claim 1, wherein said average pore diameter is in the range of 8 to 10 μm.
Claim 4
Dependent Claim
15 words
A filter according to claim 1, wherein said porous body is formed of polyurethane resin.
Claim 5
Dependent Claim
21 words
A filter according to claim 3, wherein the thickness of said filter is in the range of 0.3 to 10.0 mm.
Claim 6
Dependent Claim
21 words
A filter according to claim 3, wherein the thickness of said filter is in the range of 0.5 to 3 mm.
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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) | 1996-08-09 | 1997-02-08 | 1997-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-09 | 2001-02-08 | 2001-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-09 | 2005-02-08 | 2005-08-10 | $7700.00 | Window Closed / Lapsed |