Patent US3661671A successfully refreshed from Google Patents.
US3661671A
Expired / Lapsed
US
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Method of manufacturing an improved simulated leather and the leather product manufactured therefrom
Assignee: Nippon Kakoh Seishi KK
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Filing: 1970-02-20
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Granted: 1972-05-09
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Expires: 1990-02-20
Abstract
Abstract Method of manufacturing an improved simulated leather and the product leather are described. In the method, a low-foam polyolefin sheet is quenched immediately after its emergence from an extrusion die and the quenched side of said sheet is subjected to corona discharge. An adhesive agent is applied to the treated side and, after drying, a thermoplastic synthetic resin film or sheet is laminated to said surface.
Inventors
- 👤 Keizo Katagiri
- 👤 Kenji Kuroishi
- 👤 Kazuchika Nakamura
- 👤 Katsutoshi Hagiwara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:13
CPC Classifications
B; B32; B32B; B32B27/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
21 words
A method according to claim 1, wherein said polyolefin is selected from the group consisting of polyethylene, polypropylene, and ethylene-propylene copolymer.
Claim 2
Dependent Claim
37 words
A method according to claim 1, wherein said thermoplastic synthetic resin is selected from the group consisting of polyvinyl chloride resin, vinyl chloride-vinyl acetate copolymer, ethylene-vinyl acetate-vinyl chloride terpolymer, polyurethane resin, polyamide resin and polyamino acid resin.
Claim 3
Dependent Claim
34 words
A method as set forth in claim 1, wherein said face is quenched by contact with a heat conductive solid surface having a temperature of 4* to 15* C. during at least 10 seconds.
Claim 4
Dependent Claim
34 words
A method as set forth in claim 4, wherein said face is quenched by contact with said surface while said sheet travels over said surface at a rate of 3 6 meter per minute.
Claim 5
Dependent Claim
18 words
A method as set forth in claim 5, wherein said contact is maintained for 10 to 15 seconds.
Claim 6
Dependent Claim
21 words
A method as set forth in claim 1, wherein said polyolefin is polyethylene and said sheet is extruded at 160* C.
References Cited (Backward Citations)
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 |