Patents by Inventor John S. Tulk

John S. Tulk 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).

  • Aqueous phosphor coating suspension for lamps
    Patent number: 5858277
    Abstract: An aqueous coating suspension for a fluorescent lamp comprises particles of an alkaline earth chlorofluorophosphate phosphor activated by antimony and manganese, water, at least one water soluble binder, a defoaming agent, a surface active agent and a sufficient amount of ammonium chloride for improving lamp maintenance.
    Type: Grant
    Filed: December 23, 1992
    Date of Patent: January 12, 1999
    Assignee: Osram Sylvania Inc.
    Inventors: Chung-Nin Chau, Steven C. Fowler, John S. Tulk, Paul W. Salvi, Tracy V. Silloway, Karen Lee
  • Method of treating europium activated strontium tetraborate phosphor
    Patent number: 5378398
    Abstract: Europium activated strontium tetraborate phosphor is reacted with strontium carbonate or strontium fluoride or ammonium fluoride in order to improve emission characteristics.
    Type: Grant
    Filed: July 15, 1991
    Date of Patent: January 3, 1995
    Assignee: GTE Products Corporation
    Inventors: Anthony F. Kasenga, Joseph J. Lenox, John S. Tulk