US4073674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for production of multilayer composite plate
Assignee: Individual
•
Filing: 1976-04-19
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Granted: 1978-02-14
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Expires: 1996-04-19
Abstract
Abstract Multilayer composite plate in which a hard layer of a foamed plastics material, such as foamed polystyrene, is bonded between two outer layers, conveniently of plywood or chipboard. The composite plates may have peripheral slots formed by extending the outer layers beyond the edges of the intermediate layer to form flanges. The slots may be used to accommodate ties by which two composite plates abutted edge-to-edge are secured. Invention also concerned with method of bonding layers under partial vacuum and apparatus for performing the method.
Inventors
- 👤 Willy Hortel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:17
CPC Classifications
B; B32; B32B; B32B21/00; B32B21/04; B32B21/047; B32B21/08; B32B13/00; B32B13/04; B32B13/045; B32B21/02; B32B3/00; B32B3/02; B32B3/08; B32B5/00; B32B5/18; B32B7/00; B32B7/04; B32B7/12; E; E04; E04C; E04C2/00; E04C2/02; E04C2/10; E04C2/24; E04C2/243; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/0221; B32B2266/0228; B32B2307/00; B32B2307/10; B32B2307/102; B32B2307/30; B32B2307/304; B32B2315/00; B32B2315/12; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249987
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
156 words
A method of producing a multilayer composite plate construction, comprising the steps of laminating at least one hard foam layer of polystyrene having a thickness of at least 40 mm. and a density of at least 25 kp/m 3 between outer layers formed of fibrous materials, said outer layers statically absorbing bending tensile and compressive forces when said plate construction is under load, said laminating step including applying a two-component adhesive having talc as a filler to substantially the entire faces of the mating surfaces of said foam and said outer layers, locating said outer layers with said foam therebetween and the adhesive applied thereto in a pressing frame and applying an exterior force to said layers and foam that is sufficient to produce a bonded laminate while simultaneously reducing the pressure in said frame to a partial vacuum to remove the air pockets and gases in the bonding layers and to stabilize the foam layer.
Claim 2
Independent Claim
156 words
A method of producing a multilayer composite plate construction, comprising the steps of laminating at least one hard foam layer of polystyrene having a thickness of at least 40 mm. and a density of at least 25 kp/m 3 between outer layers formed of fibrous materials, said outer layers statically absorbing bending tensile and compressive forces when said plate construction is under load, said laminating step including applying a two-component adhesive having talc as a filler to substantially the entire faces of the mating surfaces of said foam and said outer layers, locating said outer layers with said foam therebetween and the adhesive applied thereto in a pressing frame and applying an exterior force to said layers and foam that is sufficient to produce a bonded laminate while simultaneously reducing the pressure in said frame to a partial vacuum to remove the air pockets and gases in the bonding layers and to stabilize the foam layer.
Claim 3
Dependent Claim
49 words
A method as claimed in claim 1, comprising the further step of forming a peripheral slot between said outer layers and the foam layer therebetween, and locating a tie of hard foam material in said slot to form a thermal insulator between said outer layers at the peripheries thereof.
Claim 4
Dependent Claim
23 words
A method as claimed in claim 1, said adhesive including an epoxy resin that is mixed with said filler and a setting agent.
References Cited (Backward Citations)
CA633463A
Cited
US3703422A
Cited
DE2026593A1
Cited
DE2131256A1
Cited
US3785105A
Cited
US3912542A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-13 | 1981-08-15 | 1982-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-13 | 1985-08-15 | 1986-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-13 | 1989-08-15 | 1990-02-14 | $7700.00 | Window Closed / Lapsed |