US3969174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic laminate
Assignee: General Electric Co
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Filing: 1974-12-20
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Granted: 1976-07-13
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Expires: 1994-12-20
Abstract
Abstract The surface smoothness of decorative laminate pressed without pans is improved by using as a pressure equalizing medium during consolidation of the laminate lay-up under heat and pressure, a thermoplastic resin layer between successive laminate lay-ups which melts or softens and flows at the consolidation temperature, the thermoplastic resin layer being protected on either side by a release medium. The use of the thermoplastic resin layer eliminates the use of the usual highly polished metal caul plates for all but the smoothest laminates and permits the use of press build-ups of many more laminate lay-ups than when using metal caul plates.
Inventors
- 👤 Peter B. Kelly
- 👤 Donald G. Pucci
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:46
CPC Classifications
B; B32; B32B; B32B29/00; B32B29/002; B32B29/005; B32B37/00; B32B37/14; B32B37/26; B44; B44C; B44C5/00; B44C5/04; B44C5/0469; B32B2317/00; B32B2317/12; B32B2317/125; B32B2451/00; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1039; Y10T428/00; Y10T428/31504; Y10T428/31942; Y10T428/31949; Y10T428/31964
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
99 words
The process of improving the surface smoothness of decorative plastic laminates prepared by the heat and pressure consolidation without caul plates of at least one lay-up consisting consecutively from bottom to top surface of a plurality of thermosetting resin impregnated paper core sheets, a thermosetting resin impregnated print sheet and a thermosetting resin impregnated overlay sheet which improvement consists of placing at the surface of each laminate lay-up to be consolidated a sandwich consisting of a thermoplastic layer which melts or softens and flows at the consolidation temperature, and a release layer on either side of said thermoplastic layer.
Claim 2
Dependent Claim
99 words
The process of improving the surface smoothness of decorative plastic laminates prepared by the heat and pressure consolidation without caul plates of at least one lay-up consisting consecutively from bottom to top surface of a plurality of thermosetting resin impregnated paper core sheets, a thermosetting resin impregnated print sheet and a thermosetting resin impregnated overlay sheet which improvement consists of placing at the surface of each laminate lay-up to be consolidated a sandwich consisting of a thermoplastic layer which melts or softens and flows at the consolidation temperature, and a release layer on either side of said thermoplastic layer.
Claim 3
Dependent Claim
26 words
The process of claim 1 wherein said thermoplastic layer melts or softens below or at the normal decorative laminate press temperature range of 100°C to 150°C.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein said thermoplastic layer is selected from polyethylene and polyethyleneacrylic copolymer and ethylene vinyl chloride.
Claim 5
Dependent Claim
12 words
The process of claim 1 in which said overlay sheet is omitted.
Claim 6
Dependent Claim
17 words
The process of claim 1 wherein said surface smoothness is further improved by using raw print sheet.
Claim 7
Dependent Claim
25 words
The process of claim 1 wherein said surface smoothness is further improved by incorporating a sheet of unimpregnated raw core paper beneath the print sheet.
Claim 8
Dependent Claim
16 words
The process of claim 1 wherein said thermoplastic layer is a coating on a release layer.
References Cited (Backward Citations)
US2442422A
Cited
US3236714A
Cited
US3215579A
Cited
US3303081A
Cited
US3373068A
Cited
US3698978A
Cited
US3723220A
Cited
US3761338A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |