US5288403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter for removing leucocytes
Assignee: Nissho Corp
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Filing: 1993-02-24
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Granted: 1994-02-22
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Expires: 2013-02-24
Abstract
Abstract A filter for removing leucocytes comprising a filter medium, said filter medium being a fibrous material made of a polyester fiber which is treated on its surface with a copolymer containing 40 to 80% by weight of units derived from glucosyloxyethyl methacylate. When the filter of the present invention is used, leucocytes are removed from concentrated platelets or platelet-rich plasma without loss of platelets.
Inventors
- 👤 Shinji Ohno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:49
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; B01D2239/00; B01D2239/04; B01D2239/0414; B01D2239/0421; B01D2239/0428; B01D2239/0471; B01D2239/06; B01D2239/065; B01D2239/12; B01D2239/1233; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/2969
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
42 words
A filter for removing leucocytes comprising a filter medium, said filter medium being a fibrous material made of a polyester fiber which is treated on its surface with a copolymer containing 40 to 80% by weight of units derived from glucosyloxyethyl methacrylate.
Claim 2
Dependent Claim
42 words
A filter for removing leucocytes comprising a filter medium, said filter medium being a fibrous material made of a polyester fiber which is treated on its surface with a copolymer containing 40 to 80% by weight of units derived from glucosyloxyethyl methacrylate.
Claim 3
Dependent Claim
17 words
The filter of claim 1, wherein the diameter of said polyester fiber is 1 to 10 μm.
Claim 4
Dependent Claim
29 words
The filter of claim 1, wherein the amount of said copolymer is 0.5 to 30% by weight on the basis of the total weight of said surface-treated fibrous material.
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) | 1997-02-21 | 1997-08-23 | 1998-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-21 | 2001-08-23 | 2002-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-21 | 2005-08-23 | 2006-02-22 | $7700.00 | Window Closed / Lapsed |