Patent US4581286A successfully refreshed from Google Patents.
US4581286A
Expired / Lapsed
US
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Artificial split suede leather and a process for producing same
Assignee: Carl Freudenberg KG
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Filing: 1985-04-30
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Granted: 1986-04-08
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Expires: 2005-04-30
Abstract
Abstract An artificial split suede leather, especially for sport or casual style shoes, is a split, needled, nonwoven material of unshrunk fibers containing at least 20% polyamide fibers by weight of the fibers having a trilobate, Y-shaped cross section. In a process of making it, only needling is used for consolidating the fibers. A spherical filler may also be used.
Inventors
- 👤 Walter Fottinger
- 👤 Kurt Jorder
- 👤 Karl-Heinz Morweiser
- 👤 Erich Fahrbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:45
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4382; D06; D06N; D06N3/00; D06N3/04; D04H1/43835; D04H1/44; D04H1/46; D04H1/48; D04H1/54; Y; Y10; Y10S; Y10S428/00; Y10S428/904; Y10T; Y10T428/00; Y10T428/25; Y10T428/259; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T442/00; Y10T442/60; Y10T442/608; Y10T442/609; Y10T442/61; Y10T442/611
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
85 words
An artificial split suede leather, comprising: a split, needled, nonwoven, fiber-containing material, wherein at least 20% of the fiber content by weight of the fiber content before any impregnations consists of polyamide fibers of trilobate, Y-shaped cross section, the material having a weight per unit of area of from about 300 to about 2500 g/m 2 and a maximum thickness of about 3 mm, and all of the fibers being unshrunk and uncrimped and having a fineness of from about 1.5 to about 6 dtex.
Claim 2
Dependent Claim
85 words
An artificial split suede leather, comprising: a split, needled, nonwoven, fiber-containing material, wherein at least 20% of the fiber content by weight of the fiber content before any impregnations consists of polyamide fibers of trilobate, Y-shaped cross section, the material having a weight per unit of area of from about 300 to about 2500 g/m 2 and a maximum thickness of about 3 mm, and all of the fibers being unshrunk and uncrimped and having a fineness of from about 1.5 to about 6 dtex.
Claim 3
Dependent Claim
25 words
The artificial split suede leather of claim 1, wherein the percentage of polyamide fibers of trilobate cross section is from about 40% to about 60%.
Claim 4
Dependent Claim
26 words
Artificial split suede leather of claim 2, wherein some of the fibers contained in the material are round cross section fibers of polyamide, viscose or cellulose.
Claim 5
Dependent Claim
26 words
Artificial split suede leather of claim 1, wherein some of the fibers contained in the material are round cross section fibers of polyamide, viscose or cellulose.
Claim 6
Dependent Claim
105 words
A process for producing an artificial split suede leather, comprising: providing a nonwoven mat of fibers, at least 20% of the fibers thereof by weight of the fibers consisting of polyamide fibers of trilobate, Y-shaped cross section and all of the fibers having a fineness of from about 1.5 to about 6 dtex; consolidating and compressing the mat only by needling to about 0.15 to about 0.25 grams per cubic meter without shrinking or crimping the fibers thereof; impregnating the compressed mat with an aqueous latex mixture suitable for artificial suede leathers; and at least splitting the impregnated mat after any necessary drying sufficient therefor.
Claim 7
Dependent Claim
105 words
A process for producing an artificial split suede leather, comprising: providing a nonwoven mat of fibers, at least 20% of the fibers thereof by weight of the fibers consisting of polyamide fibers of trilobate, Y-shaped cross section and all of the fibers having a fineness of from about 1.5 to about 6 dtex; consolidating and compressing the mat only by needling to about 0.15 to about 0.25 grams per cubic meter without shrinking or crimping the fibers thereof; impregnating the compressed mat with an aqueous latex mixture suitable for artificial suede leathers; and at least splitting the impregnated mat after any necessary drying sufficient therefor.
Claim 8
Dependent Claim
29 words
The process of claim 5, wherein the impregnating aqueous latex mixture further comprises at least one of pigment colors and polyamide dyes of an acid or metal complex basis.
Claim 9
Dependent Claim
22 words
The process of claim 6, wherein the mat comprises cellulose fibers and the impregnating aqueous latex mixture further comprises direct dyes therefor.
Claim 10
Dependent Claim
36 words
The process of claim 7, wherein the impregnating aqueous latex mixture further comprises microspheres on a silicate basis with a diameter of from about 5 to about 50 micrometers for filling the artificial split suede leather.
Claim 11
Dependent Claim
36 words
The process of claim 6, wherein the impregnating aqueous latex mixture further comprises microspheres on a silicate basis with a diameter of from about 5 to about 50 micrometers for filling the artificial split suede leather.
Claim 12
Dependent Claim
22 words
The process of claim 5, wherein the mat comprises cellulose fibers and the impregnating aqueous latex mixture further comprises direct dyes therefor.
Claim 13
Dependent Claim
36 words
The process of claim 10, wherein the impregnating aqueous latex mixture further comprises microspheres on a silicate basis with a diameter of from about 5 to about 50 micrometers for filling the artificial split suede leather.
Claim 14
Dependent Claim
36 words
The process of claim 5, wherein the impregnating aqueous latex mixture further comprises microspheres on a silicate basis with a diameter of from about 5 to about 50 micrometers for filling the artificial split suede leather.
References Cited (Backward Citations)
US4161456A
Cited
US4492731A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |