Patent US3037953A successfully refreshed from Google Patents.
US4434204A
Expired / Lapsed
US
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Spun-bonded fabric of partially drawn polypropylene with a low draping coefficient
Assignee: Carl Freudenberg KG
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Filing: 1982-09-10
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Granted: 1984-02-28
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Expires: 2002-09-10
Abstract
Abstract The present invention provides for a soft, polypropylene spun-bonded fabric comprising continuous, i.e. endlessly spun, partially drawn polypropylene filaments which have a maximum tensile elongation of at least 200%.
Inventors
- 👤 Ludwig Hartman
- 👤 Ivo Ruzek
- 👤 Engelbert L/o/ cher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:29
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/005; D04H3/08; D04H3/16; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24826; Y10T442/00; Y10T442/60; Y10T442/681
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
61 words
A spun-bonded fabric having a low draping coefficient, said fabric being comprised of polypropylene fibers which are endlessly spun in the form of a spun-bonded fabers, wherein the polypropylene fibers which comprise said fabric are partially drawn, have a maximum tensile elongation of at least about 200%, and have a fiber shrinkage determined in boiling water of less than about 10%.
Claim 2
Dependent Claim
61 words
A spun-bonded fabric having a low draping coefficient, said fabric being comprised of polypropylene fibers which are endlessly spun in the form of a spun-bonded fabers, wherein the polypropylene fibers which comprise said fabric are partially drawn, have a maximum tensile elongation of at least about 200%, and have a fiber shrinkage determined in boiling water of less than about 10%.
Claim 3
Dependent Claim
20 words
A spun-bonded fabric according to claim 1 wherein the filaments have a maximum tensile elongation of at least about 400%.
Claim 4
Dependent Claim
17 words
A spun-bonded fabric according to claim 1 wherein the fabric is characterized by a crossed paralled texture.
Claim 5
Dependent Claim
26 words
A spun-bonded fabric according to claim 1, wherein the draping coefficient (D) satisfies the equation: D≦1.65FG+30(%) wherein (FG) is the area weight of the particular material.
Claim 6
Dependent Claim
28 words
A spun-bonded fabric according to claim 1 or 4, wherein the weight per unit area of the fabric is between about 5 to about 50 g/m 2 .
Claim 7
Dependent Claim
27 words
A spun-bonded fabric according to claim 1 to which a surfactant has been applied to provide said fabric with a surface tension of about 35×10 -5 N/cm.
References Cited (Backward Citations)
US4100319A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-27 | 1987-08-29 | 1988-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-27 | 1991-08-29 | 1992-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-27 | 1995-08-29 | 1996-02-28 | $7700.00 | Window Closed / Lapsed |