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Cushioning material

  • US 3,231,454 A
  • Filed: 04/14/1961
  • Issued: 01/25/1966
  • Est. Priority Date: 04/14/1961
  • Status: Expired due to Term
First Claim
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1. A CUSHIONING MATERIAL COMPRISING A FIRST SHEET OF RESILIENT THERMOPLASTIC FILM MATERIAL OF THE TYPE CHARACTERIZED BY ITS RETENTION OF A STATIC CHARGE, SAID FIRST SHEET HAVING A PLURALITY OF GENEREALLY FRUSTO-CONICAL HOLLOW PROJECTIONS FORMED THEREIN, ALL OF SAID PROJECTIONS PROJECTING OUTWARDLY FROM ONE SIDE OF SAID SHEET IN THE SAME DIRECTION AND INCLUDING A FRUSTO-CONICAL SIDE WALL PORTION AND A PLANAR END WALL PROTION, MEANS DEFINING A FLOW RESTRICTING VENT OPENING IN SAID PLANAR END PORTION OF SAID PROJECTIONS, AND A SECOND SHEET FORMED OF A THERMOPLASTIC FILM MATERIAL ALSO HAVING STATIC CHARGE RETENTION CHARACTERISTICS, SAID SECOND SHEET BEING DISPOSED IN CONTACT WITH THE OTHER SIDE OF SAID FIRST SHEET WHEREBY A PLURALITY OF AIR POCKETS ARE DEFINED BETWEEN SAID FIRST AND SECOND SHEETS BY SAID HOLLOW PROJECTIONS, SAID FIRS T AND SECOND SHEETS BEING ATTRACTED TO EACH OTHER BY THEIR RETAINED STATIC CHARGES.

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