Patents by Inventor Keith A. Klindinst

Keith A. Klindinst 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).

  • Recovery of electroluminescsent phosphor from encapsulated material
    Patent number: 6562260
    Abstract: A method of recovering a base phosphor from encapsulated phosphors, which comprises the steps of selecting a recovery vessel including a magnetic stir bar; adding to the recovery vessel, deionized water, a first batch of concentrated hydrochloric acid and encapsulated phosphor to form a stirred suspension; heating the stirred suspension to about 90° C. for about 2 hours; settling the stirred suspension; decanting the mother liquor and slurrying the remaining solids with a second batch of hydrochloric acid and water; decanting and washing the remaining solids with deionized water; filtering the remaining solids to form a filter cake; heating the filter cake at 110° C. in air for a time sufficient to form a dried filter cake; and screening the dried filter cake through a −325 mesh screen to yield a recovered base phosphor.
    Type: Grant
    Filed: September 26, 2001
    Date of Patent: May 13, 2003
    Assignee: Osram Sylvania Inc.
    Inventors: Richard G. W. Gingerich, Chen-Wen Fan, Keith A. Klindinst