Patents by Inventor Dov B. Goldman

Dov B. Goldman 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).

  • Method for making colored magnetic particles and their use in electrostatographic toner compositions
    Patent number: 5071724
    Abstract: The present invention provides for a method for the preparation of colored magnetic particles for multicomponent toner compositions in which colors are produced by means of a chemical reaction of different metallic oxides formed on the surface of the magnetic particles.
    Type: Grant
    Filed: February 4, 1991
    Date of Patent: December 10, 1991
    Assignee: Olin Hunt Sub I Corp.
    Inventor: Dov B. Goldman
  • Method for making magnetic particles having improved conductivity and their use in electrostatographic printing applications
    Patent number: 5021315
    Abstract: The present invention provides for a method for the preparation of red colored magnetic particles for multicomponent toner compositions which are highly conductive and therefore suitable for use as developers in high speed electrophotographic copy machines embodying magnetic brush development. Suitable magnetic core metal particles are provided which are subsequently coated with finely divided particles of copper oxide (CuO). The copper oxide coating is then reduced in-situ on the surface of the core particle to provide an electrically conductive core particle uniformly coated with adherent metallic copper, which particle is of a red color.The present invention also provides a method for controlling and adjusting the electrical conductivity and color of toner materials as a function of the amount of metallic copper deposited on the surface of the magnetic core materials.
    Type: Grant
    Filed: June 7, 1989
    Date of Patent: June 4, 1991
    Assignee: Olin Hunt Sub I Corp.
    Inventor: Dov B. Goldman