US4913897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of hydrogel solutions to form a hydrophilic protective film on the skin against toxic substances, pollutants, infections and skin secretions
Assignee: Bio Products Inc
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Filing: 1987-12-28
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Granted: 1990-04-03
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Expires: 2007-12-28
Abstract
Abstract A thin film of hydrophilic hydrogel is applied to a person's skin, including hands, forearms, and face to prevent shedding of minute skin particulates, to prevent fingerprints, and to prevent transmission of toxic substances through the film.
Inventors
- 👤 Milos Chvapil
- 👤 Stuart A. Hoenig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:55
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/18; A61K8/72; A61K8/81; A61K8/8135; A61K8/02; A61K8/04; A61K8/042; A61K8/8141; A61K8/84; A61K8/87; A61Q; A61Q17/00; A62; A62D; A62D5/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
163 words
A method of forming a protecting film on a person's skin, the method comprising the steps of: (a) dissolving a hydrophilic hydrogel polymer from the group consisting of hydrophilic polyurethane, polymers and copolymers of acrylonitrile, and polyvinyl acetate with a solvent from the group consisting of ethanol/water, ethyl alcohol, isopropyl alcohol, dimethylsulfoxide, and glycerol to form a polymeric solution; (b) uniformly spreading a thin layer of the polymeric solution onto substantially all of a portion of the person's skin; (c) drying the layer to form a pliable, tough, hydrogel film which is adhesive to the person's skin; (d) absorbing water from perspiration by the person's skin under the layer through an inner surface of the film into the film while blocking passage of greasy seabum from the person's skin; (e) passing the absorbed water through the film from the inner surface of the film to an outer surface of the film; and (f) evaporating the water from the outer surface of the film.
Claim 2
Independent Claim
163 words
A method of forming a protecting film on a person's skin, the method comprising the steps of: (a) dissolving a hydrophilic hydrogel polymer from the group consisting of hydrophilic polyurethane, polymers and copolymers of acrylonitrile, and polyvinyl acetate with a solvent from the group consisting of ethanol/water, ethyl alcohol, isopropyl alcohol, dimethylsulfoxide, and glycerol to form a polymeric solution; (b) uniformly spreading a thin layer of the polymeric solution onto substantially all of a portion of the person's skin; (c) drying the layer to form a pliable, tough, hydrogel film which is adhesive to the person's skin; (d) absorbing water from perspiration by the person's skin under the layer through an inner surface of the film into the film while blocking passage of greasy seabum from the person's skin; (e) passing the absorbed water through the film from the inner surface of the film to an outer surface of the film; and (f) evaporating the water from the outer surface of the film.
Claim 3
Dependent Claim
33 words
The method of claim 1 wherein step (b) includes uniformly spreading a thin layer of the polymeric solution onto substantially all of the skin of the fingers of a hand of the person.
Claim 4
Dependent Claim
28 words
The method of claim 1 wherein step (b) includes uniformly spreading a thin layer of the polymeric solution onto substantially all of the skin of the person's face.
Claim 5
Dependent Claim
33 words
The method claim 1 wherein step (a) includes dissolving the hydrophilic hydrogel polymer into the solvent in an amount effective to cause the film to retain 40-65 weight percent water when fully hydrated.
Claim 6
Dependent Claim
22 words
The method of claim 1 including mixing a filler powder in the polymeric solution to reduce the stickiness of the protective film.
Claim 7
Dependent Claim
33 words
The method of claim 1 including mixing filler powder of inert powder of particle sizes of about 5-10 Angstroms in the polymeric solution in order to reduce the stickiness of the protective film.
Claim 8
Dependent Claim
16 words
The method of claim 1 including removing the film by peeling it off the person's skin.
Claim 9
Dependent Claim
19 words
The method of claim 6 including removing the film by applying heated water to the film before peeling it.
Claim 10
Dependent Claim
20 words
The method of claim 1 including mixing a coloring agent into the polymeric solution to color the hydrophilic hydrogel film.
Claim 11
Dependent Claim
14 words
The method of claim 1 including combining an insect repellent with the polymeric solution.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
US4420589A
Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-02 | 1993-10-02 | 1994-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-02 | 1997-10-02 | 1998-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-02 | 2001-10-02 | 2002-04-03 | $7700.00 | Window Closed / Lapsed |