Patent US3941633A successfully refreshed from Google Patents.
US3941633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic laminate, article and method of making same
Assignee: Seton Co
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Filing: 1974-03-27
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Granted: 1976-03-02
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Expires: 1994-03-27
Abstract
Abstract A plastic laminate and shaped article having a polyurethane film substrate, a fabric superstrate and an intermediate layer of polyurethane foam. The polyurethane foam layer is cast upon the polyurethane film to provide a substantially integral laminate. The fabric layer is also bonded to the foam layer, preferably prior to complete curing, permitting the use of unnapped fabrics.
Inventors
- 👤 Tsu-Huai Wang
- 👤 Edgar T. Key
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:27
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/065; A; A43; A43B; A43B23/00; A43B23/02; A43B23/0205; A43B23/0235; B32B27/40; B32B5/00; B32B5/22; B32B5/24; B32B5/245; D; D06; D06N; D06N3/00; D06N3/0086; D06N3/0095; D06N3/12; D06N3/14; B32B38/00; B32B2038/0052; B32B2038/0076; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/0278; B32B2437/00; B32B2437/02; B32B2601/00; Y; Y10; Y10S; Y10S428/00; Y10S428/904; Y10S428/906; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1043; Y10T156/1044; Y10T156/1048; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249988; Y10T428/249991; Y10T428/249992; Y10T428/31504; Y10T428/31551; Y10T428/31554
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
80 words
A method of making a laminate, comprising the steps of: a. casting a layer of substantially fully reacted polyurethane as a substrate on a carrier treated with a release agent, b. drying of said polyurethane substrate layer, c. casting a layer of substantially completely foamed polyurethane on said polyurethane substrate, d. heating said laminate to at least partially curing said polyurethane foam layer, e. bonding a flexible sheet over said polyurethane foam layer, and f. completely curing the polyurethane layer.
Claim 2
Independent Claim
80 words
A method of making a laminate, comprising the steps of: a. casting a layer of substantially fully reacted polyurethane as a substrate on a carrier treated with a release agent, b. drying of said polyurethane substrate layer, c. casting a layer of substantially completely foamed polyurethane on said polyurethane substrate, d. heating said laminate to at least partially curing said polyurethane foam layer, e. bonding a flexible sheet over said polyurethane foam layer, and f. completely curing the polyurethane layer.
Claim 3
Dependent Claim
39 words
The method defined in claim 1, wherein said polyurethane foam layer is cured until tack-free, and said flexible sheet is bonded to said foam layer by applying an adhesive to the interface between said foam layer and flexible sheet.
Claim 4
Dependent Claim
30 words
The method defined in claim 1, wherein said polyurethane foam layer is partially cured, but remains tacky and said flexible sheet is applied under pressure directly to said foam layer.
Claim 5
Dependent Claim
44 words
The method defined in claim 1, wherein said polyurethane is substantially completely foamed prior to application to said unfoamed polyurethane substrate, said foamed layer having a density of about thirty-three to fifty pounds per cubic foot and greater than 120 cells per linear inch.
Claim 6
Dependent Claim
47 words
The method defined in claim 1, wherein said flexible sheet is a sheet of fabric, including bonding an unnapped face of a fabric sheet to said polyurethane foam layer by applying a polyurethane adhesive to said polyurethane foam when said foam is tack-free, but not completely cured.
Claim 7
Dependent Claim
50 words
The method defined in claim 1, including the additional steps of: a. removing the plastic laminate from the treated surface; and b. heating and forming under pressure a shaped article having concave surfaces with said fabric layer forming a supporting substrate and the finish layer forming the exterior finish layer.
References Cited (Backward Citations)
US3607593A
Cited
US3794548A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |