Patents Assigned to Wifo Wissenschaftliches Forschungs-Institut A.G.
  • Apparatus for fixing electrophotographic images
    Patent number: 4001544
    Abstract: Apparatus for fixing electrophotographic images carrying toner powder and comprising an upper heated fixing roller and a lower driven counter roller cooperating with the fixing roller to form a nip for the passage of image bearing sheets to be fixed, the fixing roller having a resilient tubular shell of metal or other material of high thermal conductivity.
    Type: Grant
    Filed: November 8, 1974
    Date of Patent: January 4, 1977
    Assignee: Wifo Wissenschaftliches Forschungs-Institut A.G.
    Inventors: Paul Heinzer, Helmut Wulz
  • Electrophotographic copying machine with seamless image forming and transfer band
    Patent number: 3981578
    Abstract: An electrophotographic copying machine which includes an endless and seamless image forming and transfer band of electrically conducting material having a coating of photoconductive material.
    Type: Grant
    Filed: February 11, 1975
    Date of Patent: September 21, 1976
    Assignee: Wifo Wissenschaftliches Forschungs-Institut A.G.
    Inventor: Paul Heinzer
  • Electrophotographic copying machines
    Patent number: 3980863
    Abstract: Apparatus for fixing electrophotographic images produced by an electrophotographic copying machine, comprising a conveyor belt for transporting image bearing sheets on its upper run and a planar heater which extends substantially parallel to the upper run and is disposed closely above it but out of contact with the sheets.
    Type: Grant
    Filed: November 8, 1974
    Date of Patent: September 14, 1976
    Assignee: Wifo Wissenschaftliches Forschungs-Institut A.G.
    Inventors: Helmut Wulz, Paul Heinzer