Patents Represented by Attorney R. A. Gerlach

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  • Single component magnetic toner
    Patent number: 4218530
    Abstract: A toner and process of its manufacture for use in electrostatic development processes involving a magnetic toner without carrier are disclosed. The toner of the invention is semiconductive and effectively transferred from photoreceptors to plain paper after development. The preferred process of formation involves spray drying from a slurry solution.
    Type: Grant
    Filed: July 3, 1978
    Date of Patent: August 19, 1980
    Assignee: Xerox Corporation
    Inventor: Chin H. Lu
  • In situ coating then spray drying of magnetic toner
    Patent number: 4192902
    Abstract: A method of toner formation wherein a dispersion of magnetic pigment, resin, solvent and surfactant is spray dried to form the toner particles. Two preferred processes are disclosed: (1) A dispersion of magnetite, resin, fatty acid, and solvent is prepared by high speed agitation. The dispersion is then spray dried to form toner particles. (2) A dispersion of magnetite, fatty acid and solvent is subject to reflux heating, followed by addition of resin solution prior to spray drying to form toner particles.
    Type: Grant
    Filed: May 2, 1977
    Date of Patent: March 11, 1980
    Assignee: Xerox Corporation
    Inventor: Chin H. Lu