Patents Assigned to Cindu N.V.
  • Method of preparing electrode pitches
    Patent number: 3970542
    Abstract: A method for the preparation of electrode pitch which includes mixing a highly aromatic residual fraction from petroleum raw materials with a coal tar pitch in a weight ratio of from 1:9 to 9:1 and heating the mixture at a temperature of above 350.degree.C. until a pitch is produced with a softening point above 60.degree.C., an insolubility in anthracene oil and toluene is over 30 percent and a coking value of at least 50 corresponding to binder pitch for the production of carbon, graphite electrodes and refractory material.
    Type: Grant
    Filed: November 15, 1974
    Date of Patent: July 20, 1976
    Assignee: Cindu N.V.
    Inventor: Pieter Jan Willem Bongertman