Patents by Inventor Carl H. Hess

Carl H. Hess 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).

  • Reprographic metal halide lamps having long life and maintenance
    Patent number: 5013968
    Abstract: Metal halide vapor arc lamps for reprographic and projection processes emitting in the blue, green and red bands with excellent primary color separation and having long life and lumen maintenance contain mercury, zinc, indium, lithium, thallium, a halogen and a rare earth metal such as lanthanum, scandium or dysporsium in the arc tube.
    Type: Grant
    Filed: March 10, 1989
    Date of Patent: May 7, 1991
    Assignee: General Electric Company
    Inventors: Timothy D. Russell, Carl H. Hess, Paul G. Hlahol, Charles N. Stewart
  • Metal halide lamps with oxidized frame parts
    Patent number: 4918352
    Abstract: Metal halide lamps having better lumen maintenance over the life of the lamp contain metal frame parts whose surface is oxidized either prior to lamp assembly or oxidized in-situ during operation of the lamp by oxygen or an oxidizing agent present inside the outer vitreous envelope.
    Type: Grant
    Filed: November 7, 1988
    Date of Patent: April 17, 1990
    Assignee: General Electric Company
    Inventors: Carl H. Hess, Frank I. Ewing, Ralph M. Potter, Timothy D. Russell, Edward G. Zubler