Patents by Inventor Riozo Akiyama

Riozo Akiyama 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).

  • Discharge lamp and method of making same
    Patent number: 4303848
    Abstract: In a discharge lamp comprising a sintered electrode comprising a high temperature melting metal such as tungsten, molybdenum, tantalum or mixtures thereof as a main ingredient of the sintered electrode and an electron emissive material of an alkaline earth metal or compound thereof, the sintered electrode further comprising at least one oxide of a metal selected from the group consisting of yttrium, zirconium and aluminum.
    Type: Grant
    Filed: August 29, 1979
    Date of Patent: December 1, 1981
    Assignee: Toshiba Corporation
    Inventors: Kenichi Shimizu, Akihiro Kamiya, Shu Yamazaki, Riozo Akiyama, Teruji Makuuchi, Shiichiro Yoshizaki