Patent US4985280A successfully refreshed from Google Patents.
US4985280A
Expired / Lapsed
US
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Process for hydrophobization of microbacteria retaining air filter
Assignee: Kombinat Medizin und Labortechnik Leipzig VEB
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Filing: 1989-05-22
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Granted: 1991-01-15
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Expires: 2009-05-22
Abstract
Abstract The invention concerns a process for hydrophobation of materials for microbacteria-retaining air filters which are preferentially used for blood transfusion and therapy by infusions. Fluorocarbons or their compounds are used for surface coating of filter materials, the contacting of which are effected either by spraying or by immersion. During these procedures, the hydrophobating agent can be in the form of either a solution, emulsion, or in pure form.
Inventors
- 👤 Ralph-Peter Scholz
- 👤 Volker Glockner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:44
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0088; A; A61; A61L; A61L9/00; A61L9/16; B01D39/00; B01D39/14; B01D67/0093; B01D67/00933
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
66 words
A process for hydrophobing air filter materials for retaining microbacteria, comprising applying to an air filter material selected from the group consisting of ceramics, textile fleece, glass fleece and nuclear track microfilter foil a hydrophobing composition consisting of at least one perfluorocarbon or a solution or suspension thereof, the composition containing no other active ingredient, said perfluorocarbon being a mixture of a perfluoroalkane and a perfluoroalkene.
Claim 2
Dependent Claim
66 words
A process for hydrophobing air filter materials for retaining microbacteria, comprising applying to an air filter material selected from the group consisting of ceramics, textile fleece, glass fleece and nuclear track microfilter foil a hydrophobing composition consisting of at least one perfluorocarbon or a solution or suspension thereof, the composition containing no other active ingredient, said perfluorocarbon being a mixture of a perfluoroalkane and a perfluoroalkene.
Claim 3
Dependent Claim
21 words
A process according to claim 1, wherein the critical internal surface tension of the applied perfluorocarbon is 18 nN/m or less.
Claim 4
Dependent Claim
23 words
A process according to claim 2, wherein the coated air filter material has a minimum throughput of 100 ml of air per minute.
Claim 5
Dependent Claim
22 words
A process according to claim 1, in which the carbon chain lengths of the perfluoroalkane and the perfluoroalkene are 5 to 8.
Claim 6
Dependent Claim
15 words
A process according to claim 4, in which the air filter materials consist of ceramics.
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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) | 1994-01-14 | 1994-07-16 | 1995-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-14 | 1998-07-16 | 1999-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-14 | 2002-07-16 | 2003-01-15 | $7700.00 | Window Closed / Lapsed |