Method of making a reinforced foam-filled resin-impregnated fiber glass covered vacuum forming mold plug
Patent 4073049 Issued on February 14, 1978. Estimated Expiration Date: 
February 14, 1995. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 14, 1995. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorAssigneeApplicationNo. 05/544525 filed on 01/27/1975US Classes:29/458, With coating before or during assembling114/357, Plastic156/245, In configured mold156/253, Subsequent to assembly of laminae156/79, Subsequent to assembly of laminae264/156, Plurality of holes264/219, WITH STEP OF MAKING MOLD OR MOLD SHAPING, PER SE264/255, Sequential formation of portion on same mold or a preform surface264/257, One component is a fibrous or textile sheet, web, or batt264/261, Uniting spaced preforms, by introducing fluent material therebetween264/263, To unite independent contacting preforms264/294, Plural sequential shaping or molding steps on same workpiece264/309, Spraying or flinging material against a shaping surface264/46.5, Uniting spaced preforms or solidified layers by introducing foamable material therebetween264/46.6Against inner surface of a hollow preform or solidified layerExaminersPrimary: Hoag, Willard E.Attorney, Agent or FirmAbstractMethod of making a mold for vacuum thermoforming is made by (a) applying a polyester gel coat to a master pattern; (b) applying a rigidizing mixture of a thermosetting resin and glass to the gel coat; (c) constructing and bonding an egg crate framework to the cured thermoset resin and glass fiber mixture; (d) filling the spacings of the egg crate framework with a polymeric rigidizing foam; (e) forming a vacuum plenum on the foam-filled egg crate; (f) attaching to the vacuum plenum a means for introducing a vacuum and; (g) forming air passageways through the gel coat which communicate with the vacuum plenum.Other References
Field of SearchShaping material and uniting to a preform or solidified layerUniting spaced preforms or solidified layers by introducing foamable material therebetween Against inner surface of a hollow preform or solidified layer Utilizing metal part or reinforcement WITH STEP OF MAKING MOLD OR MOLD SHAPING, PER SE Spaced molded portions interconnected by solid preform Separate stage covering of different preform areas Building unit having spaced walls Uniting spaced preforms, by introducing fluent material therebetween To unite independent contacting preforms Cavity lining type Shaped material extends through holes in preform Spraying or flinging material against a shaping surface By separately molding different article portions Sequential formation of portion on same mold or a preform surface Plurality of holes Forming mold from fluent material | |
