US4215693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biological surgical dressing
Assignee: Individual
•
Filing: 1978-03-17
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Granted: 1980-08-05
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Expires: 1998-03-17
Abstract
Abstract A biological surgical dressing, especially a surgical dressing for wounds composed of a combination of collagen fibers and carbamide, primarily in a ratio of 65 to 99 percent by weight collagen fibers and 1 to 35 percent by weight carbamide.
Inventors
- 👤 Ulf S. E. Rothman
- 👤 Sven C. Frederiksen
- 👤 Bernt O. Leube
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:40
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/32; A61L15/325
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
37 words
A biological surgical dressing, especially a surgical dressing for wounds, comprising a combination of collagen fibers and carbamide, there being present 65 to 99 percent by weight collagen fibers and 1 to 35 percent by weight carbamide.
Claim 2
Dependent Claim
37 words
A biological surgical dressing, especially a surgical dressing for wounds, comprising a combination of collagen fibers and carbamide, there being present 65 to 99 percent by weight collagen fibers and 1 to 35 percent by weight carbamide.
Claim 3
Dependent Claim
37 words
The surgical dressing as defined in claim 1, wherein the collagen fibers are present in an amount of 80 to 95 percent by weight and the carbamide in an amount of 5 to 20 percent by weight.
Claim 4
Dependent Claim
19 words
The surgical dressing as defined in claim 1, wherein the surgical dressing is in the form of a film.
Claim 5
Dependent Claim
19 words
The surgical dressing as defined in claim 1, wherein the surgical dressing is in the form of a foil.
Claim 6
Dependent Claim
20 words
The surgical dressing as defined in claim 1, wherein the collagen fibers of the surgical dressing consist of animal material.
Claim 7
Dependent Claim
18 words
The surgical dressing as defined in claim 5, wherein the animal material is the skin of an animal.
Claim 8
Dependent Claim
48 words
The surgical dressing as defined in claim 5, wherein the collagen fibers of animal material are obtained by subjecting the animal material to alkaline swelling, washing and acid treatment, and transformation of the thus swelled and cleaned material into fibers by mechanical splitting and drying of such material.
Claim 9
Dependent Claim
17 words
The surgical dressing as defined in claim 7, wherein the alkaline swelling is accomplished with lime milk.
Claim 10
Dependent Claim
17 words
The surgical dressing as defined in claim 7, wherein the acid treatment is accomplished with hydrochloric acid.
References Cited (Backward Citations)
US2557871A
Cited
US2525753A
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US2610625A
Cited
US3157524A
Cited
US3368911A
Cited
US3587586A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-05 | 1984-02-04 | 1984-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-05 | 1988-02-04 | 1988-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-05 | 1992-02-04 | 1992-08-05 | $7700.00 | Window Closed / Lapsed |