US3974308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for treating a disposable surgical drape
Assignee: Kimberly Clark Corp
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Filing: 1975-06-10
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Granted: 1976-08-10
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Expires: 1995-06-10
Abstract
Abstract A normally hydrophobic, open-celled polyurethane foam for use on the surface of a disposable surgical drape is treated with the reaction product of a mineral acid and a fatty acid tertiary amine, wherein the amine is partially neutralized to a fatty acid tertiary ammonium salt which renders the foam material antistatic, while providing increased rates of fluid absorption and reduced tendency for lathering when the foam material is rubbed with water present on the foam material. An improved disposable surgical drape comprises an outer layer of the treated foam bonded to a fluid-impervious plastic layer attached to a fibrous base sheet.
Inventors
- 👤 Terry L. Winters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:29
CPC Classifications
A; A61; A61B; A61B46/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
158 words
A method for treating a normally hydrophobic, open-celled polyurethane foam for use on the surface of a disposable surgical drape or the like, to reduce the surface resistivity of the foam to less than 5 × 10 11 ohms, increase the rate of fluid absorption thereof and minimize the tendency of the treated foam to lather when rubbed in the presence of water, comprising the steps of: applying to the surface of the foam an isopropanol-water solution of the reaction product of a mineral acid and a fatty acid tertiary amine, said fatty acid tertiary amine being neutralized less than about 34% to form a fatty acid tertiary ammonium salt, said fatty acid tertiary amine having the structural formula: ##EQU1## wherein R signifies an alkyl group containing from 12 to 18 carbon atoms; said solution being applied in sufficient quantity to apply at least about 0.125 gms/yd 2 of said reaction product to the surface of said foam.
Claim 2
Independent Claim
158 words
A method for treating a normally hydrophobic, open-celled polyurethane foam for use on the surface of a disposable surgical drape or the like, to reduce the surface resistivity of the foam to less than 5 × 10 11 ohms, increase the rate of fluid absorption thereof and minimize the tendency of the treated foam to lather when rubbed in the presence of water, comprising the steps of: applying to the surface of the foam an isopropanol-water solution of the reaction product of a mineral acid and a fatty acid tertiary amine, said fatty acid tertiary amine being neutralized less than about 34% to form a fatty acid tertiary ammonium salt, said fatty acid tertiary amine having the structural formula: ##EQU1## wherein R signifies an alkyl group containing from 12 to 18 carbon atoms; said solution being applied in sufficient quantity to apply at least about 0.125 gms/yd 2 of said reaction product to the surface of said foam.
Claim 3
Dependent Claim
20 words
A method as defined in claim 1 wherein the pH of said solution is preferably at or above about 7.5.
Claim 4
Dependent Claim
18 words
A method as defined in claim 1 wherein said solution is printed on the surface of said foam.
Claim 5
Dependent Claim
35 words
A method as defined in claim 1 wherein said solution contains approximately 6.2% solids of said reaction product in said isopropanol-water solvent wherein isopropanol comprises about 30 to about 80% by weight of said solvent.
Claim 6
Dependent Claim
25 words
A method as defined in claim 1 wherein said mineral acid is selected from the group consisting of phosphoric acid, sulphuric acid and hydrochloric acid.
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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) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |