Patents by Inventor Hubertus Theresia Hitzen

Hubertus Theresia Hitzen 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).

  • Rare-earth doped alkaline-earth silicon nitride phosphor, method for producing and radiation converting device comprising such a phosphor
    Patent number: 8551360
    Abstract: The invention relates to a method of manufacturing a rare-earth doped alkaline-earth silicon nitride phosphor of a stoichiometric composition. Said method comprising the step of selecting one or more compounds each comprising at least one element of the group comprising the rare-earth elements (RE), the alkaline-earth elements (AE), silicon (Si) and nitrogen (N) and together comprising the necessary elements to form the rare-earth doped alkaline-earth silicon nitride phosphor (AE2Si5N8:RE). The method further comprises the step of bringing the compounds at an elevated temperature in reaction for forming the rare-earth doped alkaline-earth silicon nitride phosphor (AE2Si5N8:RE). In such a method normally a small amount of oxygen, whether intentionally or not-intentionally added, will be incorporated in the rare-earth doped alkaline-earth silicon nitride phosphor (AE2Si5N8:RE).
    Type: Grant
    Filed: October 14, 2008
    Date of Patent: October 8, 2013
    Assignees: Leuchtstoffwerk Breitungen GmbH, Ledon Lighting Jennersdorf GmbH
    Inventors: Cheng-Jun Duan, Hubertus Theresia Hitzen, Sylke Rösler, Detlef Starick, Sven Rösler, Anne Charlotte Antoinette Delsing