Method for producing foamed composite panels and resultant product
Patent 4303728 Issued on December 1, 1981. Estimated Expiration Date: 
January 4, 2000. 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.
January 4, 2000. 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 ReferencesInventorsAssigneeApplicationNo. 06/109450 filed on 01/04/1980US Classes:428/319.7, Linear or thermoplastic264/46.5, Uniting spaced preforms or solidified layers by introducing foamable material therebetween264/46.8, Introducing preform into mold by thermoforming operation (e.g., vacuum forming, etc.)428/160, Polyurethane428/80NONRECTANGULAR SHEETExaminersPrimary: Anderson, PhilipAttorney, Agent or FirmInternational ClassesB29C 44/34 (20060101)B29C 44/12 (20060101) B29C 44/02 (20060101) B29C 44/38 (20060101) B60K 37/00 (20060101) AbstractInstrument panels or other such panels are made by injection and distribution of foam precursors into a cavity between rigid and flexible sheets tightly clamped at their borders. FIG. 3 shows relative portion of rigid sheet (A), flexible sheet (B) and mold members (M1) and (M2). Injection preferably occurs through an injection port at a parting line between (M1) and (M2) defined also by sheets (A) and (B).Other References
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