US3661674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the manufacture of flexible sheet materials
Assignee: Dunlop Holdings Ltd
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Filing: 1970-10-09
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Granted: 1972-05-09
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Expires: 1990-10-09
Abstract
Abstract To form a flexible leather-like sheet material a compressed sheet of cellular material is adhered to one or each surface of the resulting assembly, the binder is allowed to permeate and impregnate the assembly and the impregnated assembly is heated to set the binder. The term ''''fibrous material'''' is breadly defined in order to include also cellular non-fibrous materials.
Inventors
- 👤 Maurice William Higgs
- 👤 Dennis Ivor Clarke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:30
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4382; B; B32; B32B; B32B27/00; B32B5/00; B32B5/18; B32B5/22; B32B5/24; B32B5/28; C; C08; C08J; C08J9/00; C08J9/36; C08J9/40; C08J9/42; D04H1/44; D04H1/46; D04H1/498; D04H1/58; D04H1/593; D04H1/64; D04H1/645; D04H13/00; B32B2305/00; B32B2305/02; B32B2305/022; B32B2305/10; B32B2305/18; B32B38/00; B32B38/0012; B32B38/08; C08J2421/00; C08J2427/00; C08J2429/00; C08J2475/00; Y; Y10; Y10S; Y10S428/00; Y10S428/904; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1059; Y10T428/00; Y10T428/249921; Y10T428/249953
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
80 words
Method for the manufacture of flexible sheet material which comprises floating the assembly of a compressed outer sheet of a cellular material adhered to a fibrous material or cellular material on a liquid binder composition with the compressed sheet being uppermost in the assembly, so that the binder permeates upwardly and impregnates the assembly, and differentially heating one surface of the assembly with respect to the other surface to achieve differential distribution of the binder and to set the binder.
Claim 2
Dependent Claim
13 words
Method according to claim 2 in which the binder is a polymeric composition.
Claim 3
Dependent Claim
33 words
Method according to claim 2 in which the form in which the binder is applied is selected from the group consisting of solutions, dispersons and emulsions and the binder is set by drying.
Claim 4
Dependent Claim
13 words
Method according to claim 2 in which the binder is set by curing.
Claim 5
Dependent Claim
14 words
Method according to claim 2 in which the fibrous material is a non-woven felt.
Claim 6
Dependent Claim
14 words
Method according to claim 2 in which the cellular material is a reticulated foam.
Claim 7
Dependent Claim
14 words
Method according to claim 2 in which the cellular material is a polyurethane foam.
Claim 8
Dependent Claim
22 words
Method according to claim 2 in which the compressed sheet is maintained in the compressed condition without the aid of an adhesive.
Claim 9
Dependent Claim
21 words
Method according to claim 2 in which the compressed sheet is maintained in the compressed condition by means of an adhesive.
Claim 10
Dependent Claim
20 words
Method according to claim 2 in which the compression of the compressed sheet of cellular material is up to 20:1.
Claim 11
Dependent Claim
19 words
Method according to claim 2 in which the density of the compressed sheet if from 0.02 to 0.85 g/cc.
Claim 12
Dependent Claim
15 words
Method according to claim 2 in which the cellular material comprises fibers distributed within it.
References Cited (Backward Citations)
US3193437A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |