US3713938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polyurethane film/split leather laminate
Assignee: Norwood Industries Inc
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Filing: 1970-03-09
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Granted: 1973-01-30
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Expires: 1990-03-09
Abstract
Abstract Production of laminated articles by casting and drying a layer of a fully-reacted polyurethane material on a release treated carrier in a manner to form a moisture vapor-permeable and moisture-impermeable film, one or more hides of split leather being bonded to the supported film through a moisture vaporpermeable tie-coat of a compatible adhesive, and the carrier then being removed. The resultant split leather/polyurethane film product has the appearance and other properties of top-grain leather.
Inventors
- 👤 R Sutton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:51
CPC Classifications
B; B32; B32B; B32B9/00; B32B9/02; B32B9/025; B32B27/00; B32B27/40; B32B9/04; B32B9/045; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; B32B2307/00; B32B2307/70; B32B2307/724; Y; Y10; Y10S; Y10S297/00; Y10S297/02; Y10T; Y10T156/00; Y10T156/10; Y10T156/1089; Y10T156/1092; Y10T156/1097; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31554; Y10T428/31558
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
128 words
A process of finishing split leather comprising the steps of casting a layer of a fully reacted polyurethane material on a carrier treated with a release agent, drying said layer to form a moisture vapor-permeable film, applying a layer of wet adhesive material to said dried film, placing at least one soft, supple, moisture vapor-permeable split leather hide on said adhesive material layer, pressing the split surface of said split leather hide into said adhesive material layer to render said adhesive material layer discontinuous and moisture vapor-permeable, drying said adhesive material, and removing said carrier. said layer of adhesive material being insufficient to impregnate said split leather to any substantial extent thereby producing a laminated product which is moisture vapor-permeable and which retains a soft and supple nature.
Claim 2
Dependent Claim
128 words
A process of finishing split leather comprising the steps of casting a layer of a fully reacted polyurethane material on a carrier treated with a release agent, drying said layer to form a moisture vapor-permeable film, applying a layer of wet adhesive material to said dried film, placing at least one soft, supple, moisture vapor-permeable split leather hide on said adhesive material layer, pressing the split surface of said split leather hide into said adhesive material layer to render said adhesive material layer discontinuous and moisture vapor-permeable, drying said adhesive material, and removing said carrier. said layer of adhesive material being insufficient to impregnate said split leather to any substantial extent thereby producing a laminated product which is moisture vapor-permeable and which retains a soft and supple nature.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein said adhesive material is polyurethane.
Claim 4
Dependent Claim
54 words
The process of claim 1 wherein a plurality of individual split leather hides of irregular size and shape are successively fed onto the wet layer of adhesive material in juxtaposed relationship, whereby said carrier acts as a continuous support for said film with said adhesive material and plurality of split leather hides superimposed thereon.
References Cited (Backward Citations)
US3418188A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |