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Method of forming a double-walled container

  • US 3,113,831 A
  • Filed: 01/26/1961
  • Issued: 12/10/1963
  • Est. Priority Date: 01/26/1961
  • Status: Expired due to Term
First Claim
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1. A METHOD OF FORMING A DOUBLE-WALLED, OPEN-END, BLOWN CONTAINER COMPRISING THE STEPS OF:

  • FORMING AN OUTER CONTAINER WALL BY MOLDING;

    INSERTING A PARISON OF AN EXPANDABLE THERMOPLASTIC MATERIAL INTO SAID OUTER CONTAINER THROUGH THE OPEN END THEREOF;

    EXPANDING SAID PARISON BY APPLYING FLUID UNDER PRESSURE TO THE INTERIOR THEREOF;

    CONCURRENTLY FURTHER EXPANDING THE OPEN END PORTION OF SAID EXPANDING PARISON INTO SEALING ENGAGEMENT WITH THE OPEN

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