Patents by Inventor Jurgen Roellinghoff

Jurgen Roellinghoff has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Sound-insulated flow duct and process for the manufacture thereof
    Patent number: 4615411
    Abstract: A sound-insulated flow duct is provided with walls made up of a composite of an elastic thermoplastic, predominantly closed-cell foam material as the outer layer and an open-cell, elastic soft foam material as the inner layer.
    Type: Grant
    Filed: May 24, 1983
    Date of Patent: October 7, 1986
    Assignees: Dynamit Nobel AG, Helmut Rehlen, Jurgen Roellinghoff
    Inventors: Hans-Ulrich Breitscheidel, Cosmas Lorry, Helmut Rehlen, Jurgen Roellinghoff
  • Process for surface treatment of foamed sheets
    Patent number: 4364892
    Abstract: A process for the continuous modification of the surface portion only of a foamed plastic web to impart high mechanical resistance with retention of air permeability and elasticity comprises preheating the web to a temperature below its melting point, passing the preheated web through the nip of a calendar and withdrawing the web from the calender under tension. The calendar comprises a pressure roller heated to a temperature above the melting point of the web and a backing roller which is not heated.
    Type: Grant
    Filed: July 20, 1979
    Date of Patent: December 21, 1982
    Inventors: Helmut Rehlen, Jurgen Roellinghoff