US3949742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Medical dressing
Assignee: Coopervision Inc A Ny Corp
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Filing: 1974-09-20
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Granted: 1976-04-13
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Expires: 1994-09-20
Abstract
Abstract A medical dressing is provided which is adapted to perform as a synthetic skin for the therapy and protection of skin wounds such as burns, donor sites for skin grafting, ulcers, and the like. In a preferred embodiment, the medical dressing is transparent, thin and flexible, elastomeric and conformable. The preferred medical dressing comprises a laminate of a thin layer of non-porous segmented polyurethane cohesively secured to a thin layer of thrombogenic reticulated foam.
Inventors
- 👤 Bogdan Nowakowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:43
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/425; A61L15/22; A61L15/26; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24281; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249991; Y10T428/249992
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
77 words
A medical dressing for topical application to skin wounds which comprises a unitary composite of a thin layer of thrombogenic reticulated foam cohesively secured to a thin elastomeric backing having an apparent density more than about 98 percent and an average pore size below about 0.01 microns, wherein the said medical dressing is permeable to gases and impermeable to liquids and bacteria, and performs as a synthetic skin over skin wounds without loss of adhesiveness and flexibility.
Claim 2
Dependent Claim
77 words
A medical dressing for topical application to skin wounds which comprises a unitary composite of a thin layer of thrombogenic reticulated foam cohesively secured to a thin elastomeric backing having an apparent density more than about 98 percent and an average pore size below about 0.01 microns, wherein the said medical dressing is permeable to gases and impermeable to liquids and bacteria, and performs as a synthetic skin over skin wounds without loss of adhesiveness and flexibility.
Claim 3
Dependent Claim
55 words
A transparent medical dressing adapted for application as a flexible extensive cover for skin wounds which comprises a unitary composition of a thin layer of thrombogenic reticulated foam cohesively secured to a thin elastomeric segmented polyurethane backing having an apparent density more than about 98 percent and an average pore size below about 0.01 microns.
Claim 4
Dependent Claim
55 words
A transparent medical dressing adapted for application as a flexible extensive cover for skin wounds which comprises a unitary composition of a thin layer of thrombogenic reticulated foam cohesively secured to a thin elastomeric segmented polyurethane backing having an apparent density more than about 98 percent and an average pore size below about 0.01 microns.
Claim 5
Dependent Claim
37 words
A transparent medical dressing in accordance with claim 2 wherein the reticulated foam layer is a polyurethane material between 8 and 60 mils in thickness, and has an average cell size between about 40 and 300 mesh.
Claim 6
Dependent Claim
26 words
A transparent medical dressing in accordance with claim 2 wherein the segmented polyurethane backing is a polyether-based material between about 0.01 and 15 mils in thickness.
References Cited (Backward Citations)
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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) | 1979-04-13 | 1979-10-13 | 1980-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-13 | 1983-10-13 | 1984-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-13 | 1987-10-13 | 1988-04-13 | $7700.00 | Window Closed / Lapsed |