US4497871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reconstituted leather and method of manufacturing same
Assignee: CUNNINGHAM WILLIAM B JR (25%) ST LOUIS
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Filing: 1983-04-27
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Granted: 1985-02-05
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Expires: 2003-04-27
Abstract
Abstract A reconstituted leather product and a method of manufacturing this reconstituted leather product is disclosed in which leather (preferably scrap leather) is ground or shredded into a fibrous state. The fibrous leather is mixed with a binder, such as natural rubber dissolved in an evaporatable solvent (e.g., naphtha), so as to form a paste-like mix. The mix is then extruded (or otherwise formed) into sheets or webs and is cured so as to drive off excess solvent. A reinforcing mesh web may be adhered to the back face of the sheet or may be sandwiched between layers of the fibrous leather and binder. The cured reconstituted leather may be finished to have any desired surface finish or color in a manner similar to real leather. The resulting reconstituted leather closely resembles real leather in feel, color, finish, odor, strength, flexibility, and appearance, but is of much lower cost.
Inventors
- 👤 Edward W. Henke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:23
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; B29; B29B; B29B17/00; B29B17/0026; B32B5/02; B32B5/022; B32B5/024; B32B7/00; B32B7/04; B32B7/12; B32B9/00; B32B9/02; B29K; B29K2007/00; B29K2021/00; B29K2503/00; B32B2262/00; B32B2262/02; B32B2262/0261; B32B2262/10; B32B2262/101; B32B2307/00; B32B2307/50; B32B2307/54; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62; Y10; Y10S; Y10S428/00; Y10S428/904; Y10T; Y10T156/00; Y10T156/10; Y10T156/1089; Y10T156/1092; Y10T156/1093; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24438; Y10T428/31504; Y10T428/31826
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
82 words
Reconstituted leather comprising a mass of fibrous leather and a binder, said binder comprising natural rubber and an evaporatable solvent capable of dissolving, at least in part, said natural rubber, said fibrous leather being mixed with said binder, and said binder and said fibrous leather being formed into a desired sheet-like form, said solvent being an aromatic hydrocarbon liquid solvent, with the ratio of natural rubber to liquid solvent ranging between about 5-30 parts rubber to about 95-70 parts solvent, by volume.
Claim 2
Dependent Claim
82 words
Reconstituted leather comprising a mass of fibrous leather and a binder, said binder comprising natural rubber and an evaporatable solvent capable of dissolving, at least in part, said natural rubber, said fibrous leather being mixed with said binder, and said binder and said fibrous leather being formed into a desired sheet-like form, said solvent being an aromatic hydrocarbon liquid solvent, with the ratio of natural rubber to liquid solvent ranging between about 5-30 parts rubber to about 95-70 parts solvent, by volume.
Claim 3
Dependent Claim
19 words
Reconstituted leather as set forth in claim 1 wherein said rubber is ground-up rubber scrap from crepe shoe soles.
Claim 4
Dependent Claim
21 words
Reconstituted leather as set forth in claim 1 further comprising a reinforcing web adhered to said binder and said fibrous leather.
Claim 5
Dependent Claim
43 words
Reconstituted leather as set forth in claim 3 wherein said reinforcing web is a screen-like material pressed into said fibrous leather and said binder before the complete curing thereof such that said fibrous leather and binder fills the spaces within said screen-like web.
Claim 6
Dependent Claim
83 words
Reconstituted leather as set forth in claim 4 wherein said sheet-like reconstituted leather has a first layer of fibrous leather and binder on one face of said reinforcing web and another layer of fibrous leather and binder on the other face of said reinforcing web with the layers on opposite sides of the reinforcing web joining with one another prior to the complete curing thereof thereby to bond the layers to one another and to securely adhere the reinforcing web to the layers.
Claim 7
Dependent Claim
73 words
Reconstituted leather comprising a mass of fibrous leather and a binder, said binder comprising natural rubber and an evaporatable solvent capable of dissolving, at least in part, said natural rubber, said fibrous leather being mixed with said binder, and said binder and said fibrous leather being formed into a desired sheet-like form, one face of said sheet-like form constituting a finished face and being dyed and finished to a desired color and texture.
Claim 8
Dependent Claim
73 words
Reconstituted leather comprising a mass of fibrous leather and a binder, said binder comprising natural rubber and an evaporatable solvent capable of dissolving, at least in part, said natural rubber, said fibrous leather being mixed with said binder, and said binder and said fibrous leather being formed into a desired sheet-like form, one face of said sheet-like form constituting a finished face and being dyed and finished to a desired color and texture.
Claim 9
Dependent Claim
22 words
Reconstituted leather as set forth in claim 6 wherein said finished face of said sheet-like form is coated with a suitable sealer.
Claim 10
Dependent Claim
90 words
Reconstituted leather comprising a mass of fibrous leather, a binder, and a reinforcement web, said binder comprising crumb or particulate natural rubber mixed with a naphtha solvent at a ratio of about 5-30 parts rubber to about 95-70 parts naphtha by volume, said fibrous leather being mixed with said binder at a ratio ranging between about 1-2 parts binder for each part of said fibrous leather by weight to form a paste-like fibrous leather/binder mix, said mix being formed into a sheet, said reinforcement web being adhered to said sheet.
Claim 11
Dependent Claim
90 words
Reconstituted leather comprising a mass of fibrous leather, a binder, and a reinforcement web, said binder comprising crumb or particulate natural rubber mixed with a naphtha solvent at a ratio of about 5-30 parts rubber to about 95-70 parts naphtha by volume, said fibrous leather being mixed with said binder at a ratio ranging between about 1-2 parts binder for each part of said fibrous leather by weight to form a paste-like fibrous leather/binder mix, said mix being formed into a sheet, said reinforcement web being adhered to said sheet.
Claim 12
Dependent Claim
27 words
Reconstituted leather as set forth in claim 8 wherein said reinforcement web is laminated between a first and a second layer of said paste-like fibrous leather/binder mix.
Claim 13
Independent Claim
64 words
A method of manufacturing a reconstituted leather comprising the steps of: shredding a quantity of leather into a fibrous mass; making a binder comprised of natural rubber dissolved, at least in part, in a an aromatic hydrocarbon solvent; mixing said fibrous leather with said binder; forming a sheet of said fibrous leather and said binder; and curing said sheet by evaporating said solvent therefrom.
Claim 14
Independent Claim
64 words
A method of manufacturing a reconstituted leather comprising the steps of: shredding a quantity of leather into a fibrous mass; making a binder comprised of natural rubber dissolved, at least in part, in a an aromatic hydrocarbon solvent; mixing said fibrous leather with said binder; forming a sheet of said fibrous leather and said binder; and curing said sheet by evaporating said solvent therefrom.
Claim 15
Dependent Claim
29 words
The method of claim 10 wherein said fibrous leather is mixed with said binder at a ratio of about 1-2 parts binder for each part fibrous leather by weight.
Claim 16
Dependent Claim
27 words
The method of claim 10 further comprising the step of collecting the evaporated solvent evaporated from the fibrous leather/binder sheet and condensing the reclaimed solvent for reuse.
Claim 17
Dependent Claim
10 words
The method of claim 10 wherein said solvent is naptha.
Claim 18
Dependent Claim
16 words
The method of claim 11 further comprising extruding said mixed fibrous leather/binder to form said sheet.
Claim 19
Dependent Claim
16 words
The method of claim 14 further comprising adhering a web of reinforcing material to said sheet.
Claim 20
Dependent Claim
21 words
The method of claim 15 wherein said sheet is heated during curing thereby to speed the curing of the reconstituted leather.
Claim 21
Dependent Claim
34 words
The method of claim 15 wherein, before said sheet is fully cured, said reinforcing web is pressed into said fibrous leather/binder sheet whereby said fibrous leather/binder flows into the spaces within said reinforcing web.
Claim 22
Dependent Claim
23 words
The method of claim 17 further comprising a first and a second sheet of said fibrous leather/binder and sandwiching said reinforcing web therebetween.
Claim 23
Independent Claim
85 words
A method of manufacturing a reconstituted leather comprising the steps of: shredding a quantity of leather into a fibrous mass; making a binder comprised of natural rubber dissolved at least in part in a suitable evaporatable solvent, said rubber being mixed with said solvent at a ratio of about 5-30 parts rubber to about 95-70 parts solvent, by volume; mixing said fibrous leather with said binder; forming a sheet of said fibrous leather and said binder; and curing said sheet by evaporating said solvent therefrom.
Claim 24
Independent Claim
85 words
A method of manufacturing a reconstituted leather comprising the steps of: shredding a quantity of leather into a fibrous mass; making a binder comprised of natural rubber dissolved at least in part in a suitable evaporatable solvent, said rubber being mixed with said solvent at a ratio of about 5-30 parts rubber to about 95-70 parts solvent, by volume; mixing said fibrous leather with said binder; forming a sheet of said fibrous leather and said binder; and curing said sheet by evaporating said solvent therefrom.
Claim 25
Independent Claim
82 words
A method of manufacturing a reconstituted leather comprising the steps of: shredding a quantity of leather into a fibrous mass; making a binder comprised of natural rubber dissolved at least in part in naptha, said rubber being mixed with said naptha at a ratio of about 5-30 parts rubber to about 95-70 parts naptha, by volume; mixing said fibrous leather with said binder; forming a sheet of said fibrous leather and said binder; and curing said sheet by evaporating said naptha therefrom.
Claim 26
Independent Claim
82 words
A method of manufacturing a reconstituted leather comprising the steps of: shredding a quantity of leather into a fibrous mass; making a binder comprised of natural rubber dissolved at least in part in naptha, said rubber being mixed with said naptha at a ratio of about 5-30 parts rubber to about 95-70 parts naptha, by volume; mixing said fibrous leather with said binder; forming a sheet of said fibrous leather and said binder; and curing said sheet by evaporating said naptha therefrom.
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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) | 1988-02-05 | 1988-08-06 | 1989-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-05 | 1992-08-06 | 1993-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-05 | 1996-08-06 | 1997-02-05 | $7700.00 | Window Closed / Lapsed |