Patents by Inventor Masakuzu Egawa

Masakuzu Egawa 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).

  • Light Emitting Element, Light Emitting Device, and Lighting System
    Publication number: 20080036369
    Abstract: According to the present invention, a light-emitting element, a light-emitting device, and a lighting system, each of which has a broad spectrum like sunlight and has high color rendering properties, can be obtained. One embodiment of the present invention has a light-emitting device which includes at least two kinds of luminescence center materials, and at least one kind of the luminescence center materials is a quinoxaline derivative represented by the following general formula (1): wherein R1 to R4 are individually hydrogen or an alkyl group having 6 carbon atoms (a straight-chain structure or a branch structure).
    Type: Application
    Filed: August 12, 2005
    Publication date: February 14, 2008
    Applicant: SEMICONDUCTOR ENERGY LABORSTORY CO., LTD.
    Inventors: Atsushi Tokuda, Masakuzu Egawa