Patents by Inventor Mark R. Keever

Mark R. Keever 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).

  • Semiconductor devices fabricated with passivated high aluminum-content III-V material
    Patent number: 5517039
    Abstract: LEDs and other semiconductor devices fabricated with III-V materials and having exposed Al-bearing surfaces passivated with native oxides are disclosed. A known high temperature water vapor oxidation process is used to passivate the exposed layers of Al-bearing III-V semiconductor materials in confined-emission spot LEDs and other light emitting devices. These devices exhibit greatly improved wet, high temperature operating life, with little to no degradation in light output when exposed to such conditions.
    Type: Grant
    Filed: November 14, 1994
    Date of Patent: May 14, 1996
    Assignee: Hewlett-Packard Company
    Inventors: Nick Holonyak, Jr., Tim A. Richard, Mark R. Keever, Fred A. Kish, Chun Lei, Serge Rudaz