Patent US4657793A successfully refreshed from Google Patents.
US4657793A
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Fibrous structures
Assignee: Ethicon Inc
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Filing: 1986-02-25
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Granted: 1987-04-14
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Expires: 2006-02-25
Abstract
Abstract An integral fibrous structure has a plurality of continuous polymeric filaments, individual continuous filaments extending from one side of the structure to the opposite side of the structure. The portions of the continuous filaments on one side of the structure are of a first polymeric composition and the portions of the same continuous filaments on the opposite side of the structure are of a second polymeric composition different from the first polymeric composition. The structure is built up by a continuous filament forming process where fibers are attracted to a surface (11) by electrostatic potential, the composition of the fibers being varied during the production.
Inventors
- 👤 Anthony C. Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:48
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/0007; A; A61; A61L; A61L27/00; A61L27/50; A61L27/507; D01D5/04; D01F; D01F6/00; D01F6/44; D01F6/88; D04; D04H; D04H3/00; D04H3/08; D04H3/16; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1369; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2931; Y10T428/2973
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
78 words
An integral fibrous structure comprising a plurality of a polymeric filaments, at least some of said filaments being continuous and extending from one side of the structure to the opposite side of the structure, the portions of said continuous filaments on one side of the structure being of a first polymeric composition and the portions of said continuous filaments on the opposite side of the structure being of a second polymer composition different from the first polymeric composition.
Claim 2
Dependent Claim
78 words
An integral fibrous structure comprising a plurality of a polymeric filaments, at least some of said filaments being continuous and extending from one side of the structure to the opposite side of the structure, the portions of said continuous filaments on one side of the structure being of a first polymeric composition and the portions of said continuous filaments on the opposite side of the structure being of a second polymer composition different from the first polymeric composition.
Claim 3
Dependent Claim
53 words
A fibrous structure according to claim 1 wherein the continuous filaments have a transition portion between the portion of said filaments on one side of the structure and the portions of the filaments on the opposite side of the structure, said transition portion comprising a mixture of said first and second polymeric compositions.
Claim 4
Dependent Claim
24 words
A fibrous structure according to claim 1 wherein the polymeric composition of the continuous filaments varies progressively between the two sides of the structure.
Claim 5
Dependent Claim
36 words
A fibrous structure according to claim 1 wherein the polymeric composition of the continuous filaments changes abruptly between the two sides of the structure to provide distinct layers within the fibrous structure having different polymeric composition.
Claim 6
Dependent Claim
15 words
A fibrous structure according to claim 1 or 2 in the form of a mat.
Claim 7
Dependent Claim
16 words
A fibrous structure according to claim 1 or 2 in the form of a tubular member.
Claim 8
Dependent Claim
77 words
A fibrous structure as claimed in claim 6 wherein the portions of the continuous filaments at the inner surface of the tubular member are of the first polymeric composition to provide compatability with material with which the inner surface will come into contact, and the portions of the continuous filaments at the outer surface of the tubular member are of the second polymeric composition to provide desirable strength characteristics and other physical properties to the tubular member.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-13 | 1990-10-13 | 1991-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-13 | 1994-10-13 | 1995-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-13 | 1998-10-13 | 1999-04-14 | $7700.00 | Window Closed / Lapsed |