The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 18, 1992
Filed:
Feb. 26, 1988
Richard P Doerer, Grosse Pointe, MI (US);
Edward J Bihun, Huron, OH (US);
Van Dresser Corporation, Troy, MI (US);
Abstract
A method of making a lightweight panel having a relatively soft foam-backed cover sheet supported on a relatively hard, self-supporting core in one simple step. An assembly of foam layers is built up comprising a core-forming foam layer, an intermediate foam layer, and a cover-backing foam layer, with a scrim sheet over the core-forming foam layer and a cover sheet over the cover-backing foam layer. The core-forming layer is impregnated with a heat-activatable hardening compound. The intermediate layer as well as the cover-backing layer may also, if desired, be impregnated with a heat-activatable hardening compound but usually in lesser amounts. The hardening compound coats the cell walls of the foam. The panel is formed by subjecting this layered assembly to heat and pressure between contoured dies in a single compression molding operation at a temperature at which the hardening compound is activated. The layers of the assembly are bonded together either by the hardening compound or by thermoplastic films placed between layers which are melted by the heat of the molding operation and become adhesive when melted.