Patents by Inventor Edward J. Zeller

Edward J. Zeller 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 of making and using selective conductive regions in diamond layers
    Patent number: 4929489
    Abstract: A diamond lattice substrate is irradiated with a high energy particle of sufficient flux, energy level and time period to irreversibly transform an area of a plane normal to the axis of irradition into conductive graphite. The substrate is cooled during irradiation to confine the graphite to the area of the plane at a desired depth within the substrate.
    Type: Grant
    Filed: March 9, 1989
    Date of Patent: May 29, 1990
    Inventors: Gisela A. M. Dreschhoff, Edward J. Zeller
  • Process for providing identification markings for gemstones
    Patent number: 4200506
    Abstract: A method of providing permanent identification markings to gemstones such as diamond crystals by irradiating the gemstone with protons in the desired pattern. The proton bombardment results in a reaction converting the bombarded area into a different crystal lattice than that of the pre-irradiated stone.
    Type: Grant
    Filed: November 8, 1977
    Date of Patent: April 29, 1980
    Inventors: Gisela A. M. Dreschhoff, Edward J. Zeller