Patents by Inventor Junya Watabe

Junya Watabe 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).

  • Electroluminescent phosphor and its production method
    Patent number: 7135130
    Abstract: The invention provides electroluminescent phosphor having superior luminance and a long life. The host material is ZnS.aAO, of which “A” is at least one element selected from among magnesium (Mg), calcium (Ca), strontium (Sr), and barium (Ba). “a” ranges from 0.001 to 0.01. Either one of or both copper (Cu) or manganese (Mn) is contained as an activator. At least one element selected from among chlorine (Cl), bromine (Br), iodine (I), and aluminum (Al) is contained as a co-activator. The luminance and life span of the electroluminescent phosphor can be increased by limiting “a”, which represents the proportion of alkaline earth metal oxide (AO) introduced into the zinc sulfide, within the range of 0.001 to 0.01.
    Type: Grant
    Filed: February 10, 2004
    Date of Patent: November 14, 2006
    Assignee: Nemoto & Co. Ltd.
    Inventors: Junya Watabe, Yoshiki Kanno, Shigenobu Matsumura
  • Electroluminescent phosphor and its production method
    Publication number: 20040169160
    Abstract: The invention provides electroluminescent phosphor having superior luminance and a long life. The host material is ZnS.aAO, of which “A” is at least one element selected from among magnesium (Mg), calcium (Ca), strontium (Sr), and barium (Ba). “a” ranges from 0.001 to 0.01. Either one of or both copper (Cu) or manganese (Mn) is contained as an activator. At least one element selected from among chlorine (Cl), bromine (Br), iodine (I), and aluminum (Al) is contained as a co-activator. The luminance and life span of the electroluminescent phosphor can be increased by limiting “a”, which represents the proportion of alkaline earth metal oxide (AO) introduced into the zinc sulfide, within the range of 0.001 to 0.01.
    Type: Application
    Filed: February 10, 2004
    Publication date: September 2, 2004
    Applicant: NEMOTO & CO., LTD
    Inventors: Junya Watabe, Yoshiki Kanno, Shigenobu Matsumura