US4513739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wound dressing
Assignee: Smith and Nephew Inc
•
Filing: 1983-02-15
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Granted: 1985-04-30
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Expires: 2003-02-15
Abstract
Abstract An external wound dressing comprising a first layer of backing sheet material coated on one face with biocompatible adhesive; a second layer of protective sheet material covering the first layer in releasable contact with the adhesive, the second layer having means for separation in one or more sections from the first layer; and release-retarding means along one or a pair of opposed edges of the dressing to require a greater force to separate the layers at the edge or edges than at the remainder of the contact area.
Inventors
- 👤 Owen L. Johns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:27
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/02; A61F13/023
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
93 words
An external wound dressing, which comprises: (a) a first layer of backing sheet material having biocompatible adhesive coating on a first face thereof; (b) a second layer of protective sheet material covering said first layer in releasible contact with said adhesive, said second layer having means for separation in one or more sections from said first layer; and (c) release-retarding means along one edge or a pair of opposed edges of said dressing to require a greater force to separate said layers at said edges than at the remainder of the contacting area.
Claim 2
Dependent Claim
93 words
An external wound dressing, which comprises: (a) a first layer of backing sheet material having biocompatible adhesive coating on a first face thereof; (b) a second layer of protective sheet material covering said first layer in releasible contact with said adhesive, said second layer having means for separation in one or more sections from said first layer; and (c) release-retarding means along one edge or a pair of opposed edges of said dressing to require a greater force to separate said layers at said edges than at the remainder of the contacting area.
Claim 3
Dependent Claim
24 words
The dressing of claim 1 wherein said release-retarding means comprises a strip of flexible tape attached to the second face of said backing material.
Claim 4
Dependent Claim
14 words
The dressing of claim 2 wherein said attachment is by use of pressure-sensitive adhesive.
Claim 5
Dependent Claim
29 words
The dressing of claim 1 wherein said release-retarding means comprises a strip of said backing material having a thickness greater than that of the remainder of said backing material.
Claim 6
Dependent Claim
35 words
The dressing of claim 1 wherein said release-retarding means comprises a strip of adhesive on said backing material first face of greater tenacity than the adhesive coating the remainder of said backing material first face.
Claim 7
Dependent Claim
20 words
The dressing of claim 5 wherein said strip adhesive is rubber based and said remaining adhesive is acrylic ester copolymer.
Claim 8
Dependent Claim
31 words
The dressing of claim 1 wherein said release-retarding means comprises a strip of said second layer extending over said dressing edge and attached to the second face of said backing material.
Claim 9
Dependent Claim
30 words
The dressing of claim 1 wherein said release-retarding means comprises a strip of flexible sheet material attached to said second layer and to the second face of said backing material.
Claim 10
Dependent Claim
11 words
The dressing of claim 1 wherein said first layer is breathable.
Claim 11
Dependent Claim
13 words
The dressing of claim 9 wherein said backing material is transparent polyurethane film.
Claim 12
Dependent Claim
11 words
The dressing of claim 1 wherein said adhesive is water absorbent.
Claim 13
Dependent Claim
14 words
The dressing of claim 1 wherein said second layer is silicone release coated paper.
Claim 14
Dependent Claim
8 words
The dressing of claim 1 in rectangular form.
Claim 15
Dependent Claim
40 words
The dressing of claim 1 having release-retarding means along a pair of opposed edges of said dressing wherein said second layer comprises two essentially equal sections, each of said sections having a pull tab attached to the inside edge thereof.
Claim 16
Dependent Claim
45 words
The dressing of claim 1 having release-retarding means along one edge of said dressing wherein said second layer comprises a single section with a pull tab attached to each of said first and second layers at the edge of said dressing opposite said one edge.
Claim 17
Dependent Claim
121 words
A rectangular shaped external wound dressing, which comprises: (a) a breathable first layer of backing sheet material having biocompatible adhesive coating one face thereof; (b) a second layer of protective sheet material covering said first layer in releasible contact with said adhesive, said second layer comprising two essentially equal sections with each of said sections having a pull tab attached to the inside edge thereof for separation of said second layer from said first layer; and (c) a strip of pressure-sensitive tape attached to the second face of said backing material along a pair of opposed edges of said dressing, whereby a greater force is required to separate said layers at said edges than at the remainder of the contacting area.
Claim 18
Dependent Claim
121 words
A rectangular shaped external wound dressing, which comprises: (a) a breathable first layer of backing sheet material having biocompatible adhesive coating one face thereof; (b) a second layer of protective sheet material covering said first layer in releasible contact with said adhesive, said second layer comprising two essentially equal sections with each of said sections having a pull tab attached to the inside edge thereof for separation of said second layer from said first layer; and (c) a strip of pressure-sensitive tape attached to the second face of said backing material along a pair of opposed edges of said dressing, whereby a greater force is required to separate said layers at said edges than at the remainder of the contacting area.
Claim 19
Dependent Claim
17 words
A method of protecting an external wound, which comprises application of the dressing of claim 1 thereto.
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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) | 1988-04-29 | 1988-10-29 | 1989-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-29 | 1992-10-29 | 1993-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-29 | 1996-10-29 | 1997-04-30 | $7700.00 | Window Closed / Lapsed |