US5458905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous dispersion of silicone oil and method of adding silicone oil to a solid substrate
Assignee: Charter Medical Ltd
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Filing: 1993-06-28
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Granted: 1995-10-17
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Expires: 2013-06-28
Abstract
Abstract About 0.01% to 10% of an antifoam silicone oil having a predetermined viscosity of at least about 100 cp is dispersed in an aqueous solution of a water-soluble gum having a viscosity within about 20% of the predetermined viscosity of the silicone oil. A substrate is contacted with the dispersion so as to form a dispersion-wetted substrate and at least a part of the aqueous solution is removed from the substrate, wherein the silicone oil remains in the substrate.
Inventors
- 👤 David G. Heagle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 01:43
CPC Classifications
B; B01; B01D; B01D19/00; B01D19/02; B01D19/04; B01D19/0404; B01D19/0409; A; A61; A61L; A61L31/00; A61L31/04; A61L31/041; A61L31/06; A61L33/00; A61L33/06; A61L33/062; A61L33/068
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
122 words
A method of adding an antifoam silicone oil to a solid substrate, comprising: (A) mixing a silicone oil having a predetermined viscosity of at least about 100 cp and up to about 10,000 cp with an aqueous solution of one or more of a natural or synthetic water-soluble gum having a viscosity within about 20% of the predetermined viscosity of the silicone oil to form a dispersion of the silicone oil in the aqueous solution; (B) contacting the substrate in the form of an antifoam element of a blood-handling apparatus with the dispersion so as to form a dispersion-wetted substrate; and (C) removing at least a part of the aqueous solution from the substrate, wherein the silicone oil remains in the substrate.
Claim 2
Independent Claim
122 words
A method of adding an antifoam silicone oil to a solid substrate, comprising: (A) mixing a silicone oil having a predetermined viscosity of at least about 100 cp and up to about 10,000 cp with an aqueous solution of one or more of a natural or synthetic water-soluble gum having a viscosity within about 20% of the predetermined viscosity of the silicone oil to form a dispersion of the silicone oil in the aqueous solution; (B) contacting the substrate in the form of an antifoam element of a blood-handling apparatus with the dispersion so as to form a dispersion-wetted substrate; and (C) removing at least a part of the aqueous solution from the substrate, wherein the silicone oil remains in the substrate.
Claim 3
Dependent Claim
28 words
The method of claim 1 wherein the contacting is by one or more of immersion of the substrate in the dispersion, and spraying the substrate with the dispersion.
Claim 4
Dependent Claim
55 words
The method of claim 1 wherein the aqueous solution is removed from the substrate by one or more of centrifuging the substrate, applying a vacuum to the substrate, blowing onto the substrate a pressurized gas, displacing the aqueous solution with a water-insoluble fluid, dissolving the aqueous solution in an organic solvent and squeezing the substrate.
Claim 5
Dependent Claim
15 words
The method of claim 1 wherein after removing the aqueous solution, the substrate is dried.
Claim 6
Dependent Claim
21 words
The method of claim 1 wherein the amount of silicone oil added to the substrate is between about 0.5% and 50%.
Claim 7
Dependent Claim
20 words
The method of claim 1 wherein the amount of silicone oil in the dispersion is between about 0.1% and 8%.
Claim 8
Dependent Claim
20 words
The method of claim 6 wherein the amount of silicone oil in the dispersion is between about 1% and 5%.
Claim 9
Dependent Claim
15 words
The method of claim 1 wherein the silicone oil is a liquid at room temperature.
Claim 10
Dependent Claim
20 words
The method of claim 1 wherein the silicone oil has a viscosity from about 200 cp to about 3,000 cp.
Claim 11
Dependent Claim
24 words
The method of claim 1 wherein the viscosity of the aqueous solution is within about 15% of the predetermined viscosity of the silicone oil.
Claim 12
Dependent Claim
24 words
The method of claim 10 wherein the viscosity of the aqueous solution is within about 10% of the predetermined viscosity of the silicone oil.
Claim 13
Dependent Claim
20 words
The method of claim 1 wherein the water-soluble gum is one or more of carboxymethyl cellulose gum and polyacrylate gum.
Claim 14
Dependent Claim
10 words
The method of claim 1 wherein the substrate is porous.
Claim 15
Dependent Claim
15 words
The method of claim 13 wherein the substrate has at least in part hydrophobic surfaces.
Claim 16
Dependent Claim
13 words
The method of claim 14 wherein the substrate is an expanded surface substrate.
Claim 17
Dependent Claim
11 words
The method of claim 15 wherein the substrate is a foam.
Claim 18
Dependent Claim
12 words
The method of claim 16 wherein the foam is a polymeric foam.
Claim 19
Dependent Claim
12 words
The method of claim 17 wherein the foam is a polyurethane foam.
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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) | 1998-10-16 | 1999-04-17 | 1999-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-16 | 2003-04-17 | 2003-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-16 | 2007-04-17 | 2007-10-17 | $7700.00 | Window Closed / Lapsed |