Patents by Inventor Johan G. Hedberg

Johan G. Hedberg 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).

  • Fluoroelastomer containing polyethylene composition and process for extruding same
    Patent number: 4581406
    Abstract: A composition comprising 2-3 wt. % carbon black, 25-1000 ppm and preferably 75-250 ppm of a fluoroelastomer and the remainder polyethylene is disclosed. The fluoroelastomer prevents die buildup during extrusion of the composition which is believed to be caused by moisture associated with the carbon black. Alternatively, the die may be conditioned by extruding polyethylene containing 0.5-5 wt. % of the fluoroelastomer and then carbon black containing polyethylene without the fluoroelastomer can be extruded for a substantial period before die buildup begins to occur.
    Type: Grant
    Filed: June 11, 1985
    Date of Patent: April 8, 1986
    Assignee: E. I. Du Pont De Nemours and Company
    Inventors: Johan G. Hedberg, Lawrence C. Muschiatti