Patent US5156488A successfully refreshed from Google Patents.
Patent US4731260A successfully refreshed from Google Patents.
US4731260A
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Hydrophobic filter material and method
Assignee: AMERICA HOSPITAL SUPPLY Corp ONE AMERICA PLAZA EVANSTON ILLINOIS 60201 A CORP OF
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Filing: 1984-12-18
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Granted: 1988-03-15
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Expires: 2004-12-18
Abstract
Abstract A filter material comprising hydrophobic filter media treated with a wetting agent which consists essentially of a material selected from the group consisting of polysobate 20, polysorbate 40, polysorbate 60 and polysorbate 80. The wetting agent is applied by dissolving it in a solvent and spraying the resulting solution onto the filter media.
Inventors
- 👤 David P. Balding
- 👤 Li-Chien Hsu
- 👤 Sun De Tong
- 👤 Steven A. Craw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:12
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0088; A; A61; A61M; A61M1/00; A61M1/36; A61M1/3621; A61M1/3627; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
138 words
A method of making blood filter material comprising spraying a solution which includes a wetting agent and a solvent on hydrophobic filter media and evaporating the solvent leaving the wetting agent on the filter media, said wetting agent consisting essentially of material selected from the group consisting of polysorbate 20, polysorbate 40, polysorbate 60, polysorbate 80, and mixtures thereof, said filter media including first and second layers of filter media joined together along three sides to form a tube having one end closed, said step of spraying including spraying the inside and outside of the first and second layers of filters media at least adjacent the closed end, and said method including, additionally to said spraying step, depositing an additional solution of said wetting agent and said solvent onto the interior of the tube adjacent the closed end.
Claim 2
Independent Claim
138 words
A method of making blood filter material comprising spraying a solution which includes a wetting agent and a solvent on hydrophobic filter media and evaporating the solvent leaving the wetting agent on the filter media, said wetting agent consisting essentially of material selected from the group consisting of polysorbate 20, polysorbate 40, polysorbate 60, polysorbate 80, and mixtures thereof, said filter media including first and second layers of filter media joined together along three sides to form a tube having one end closed, said step of spraying including spraying the inside and outside of the first and second layers of filters media at least adjacent the closed end, and said method including, additionally to said spraying step, depositing an additional solution of said wetting agent and said solvent onto the interior of the tube adjacent the closed end.
Claim 3
Dependent Claim
36 words
A method as defined in claim 1 wherein the concentration of the wetting agent in the solution which is sprayed is less than the concentration of the wetting agent in the additional solution which is deposited.
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) | 1991-03-15 | 1991-09-14 | 1992-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-15 | 1995-09-14 | 1996-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-15 | 1999-09-14 | 2000-03-15 | $7700.00 | Window Closed / Lapsed |