Patents by Inventor Charles T. Keller

Charles T. Keller 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).

  • Producing a plasma containing beryllium and beryllium fluoride
    Patent number: 5073507
    Abstract: A plasma containing both beryllium ions and beryllium fluoride ions is achieved. Beryllium crystals are used as a cathode in an ionization chamber containing boron trifluoride gas. The boron trifluoride gas and the beryllium are ionized to produce both beryllium fluoride ions (BeF.sup.+) and beryllium ions (Be.sup.+). Beryllium fluoride ions are emitted to impact a semiconductor target and where they divide thereby implanting beryllium and fluorine.
    Type: Grant
    Filed: March 4, 1991
    Date of Patent: December 17, 1991
    Assignee: Motorola, Inc.
    Inventors: Charles T. Keller, Schyi-Yi Wu
  • Sizing mandrel for thermoplastic netting
    Patent number: 4298329
    Abstract: Mandrel for sizing thermoplastic netting having a cylindrical forming element divided into at least two radial sections retained by circumferential bands and an internal adjusting mechanism including a slidable conical element positioned to outwardly expand the radial sections of the forming element.
    Type: Grant
    Filed: May 27, 1980
    Date of Patent: November 3, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Charles T. Keller