Patents by Inventor Constantine D. Markellos

Constantine D. Markellos 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).

  • Process of making X-ray phosphors having improved efficiency
    Patent number: 5154360
    Abstract: A process for preparing an X-ray phosphor comprising the steps of:(a) mixing a predetermined ratio of phosphor precursors;(b) grinding the mixture in a fluid grinding mill to obtain particles of a predetermined size;(c) firing the mixture; and(d) recovering the phosphor.
    Type: Grant
    Filed: February 7, 1992
    Date of Patent: October 13, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: David B. Hedden, Constantine D. Markellos