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Insulating product and its manufacture

  • US 3,042,578 A
  • Filed: 09/19/1955
  • Issued: 07/03/1962
  • Est. Priority Date: 09/19/1955
  • Status: Expired due to Term
First Claim
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25. A MOLDED LIGHT WEIGHT INSULATING MATERIAL CONSISTING ESSENTIALLY OF PARTICLES OF EXPANDED PERLITE SOME OF WHICH ARE AS FINE AS 100 MESH IN SIZE, THE PERLITE PARTICLES BEING IN SUBSTANTIAL CONTACT, SAID CONTACT BEING CHARACTERIZED BY POINT CONTACT AS DISTINGUISHED FROM SURFACE CONTACT, THEREBY LEAVING A MULTITUDE OF CONNECTING INTERSTICES BETWEEN THE PARTICLES, AND A MINOR AMOUNT OF SHORT FIBER LYING IN SAID INTERSTICES AND CONSTITUTING A FIBER NETWORK TO HOLD SAID PERLITE IN THE MOLDED SHAPE, AND A BINDING CONSTITUENT CONSISTING ESSENTIALLY OF ORGANIC MATERIAL.

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