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Building or constructional material

  • US 3,914,359 A
  • Filed: 04/04/1973
  • Issued: 10/21/1975
  • Est. Priority Date: 01/04/1971
  • Status: Expired due to Term
First Claim
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1. A METHOD OF FORMING A PANEL PRODUCT FROM CONSTITUENTS INCLUDING A MIXTURE OF LIQUID SETTING POWDER AND A FIBROUS REINFORCING MATERIAL, AND PARTIALLY HEAT-EXPANDED CELLULAR BEADS OF A HEAT-EXPANSIBLE POLYMER, SAID METHOD COMPRISING INTRODUCING SAID CONSTITUENTS IN A DRY, FLOWABLE STATE INTO A MOULED IN LAYER INCLUDING A FIRST LAYER COMPRISING SAID POWDER AND FIBER MIXTURE, AND A SECOND LAYER COMPRISING SAID BREADS, WHILE CONFINING THE INTRODUCED CONSTITUENTS WITHIN THE MOULD, PERMEATING THE CONSTITUENTS WITH STEAM, BY SAID PERMEATING SIMULTANEOUSLY MOISTENING THE POWDER AND HEATING THE BEADS, AND BY SAID MOISTENING, EFFECTING SETTING OF THE POWDER, AND BY SAID HEATING, SIMULTANEOUSLY EXPANDING TH BEADS TO APPLY INTERNAL PRESSURE ON ALL OF THE CONSTITUENTS INTO A MOULD, WHICH PRESSURE COMPACTS THE CONSTITUTENTS INTO A COHERENT MASS FORMING SAID PANEL.

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