Patents by Inventor Jingfeng Gao

Jingfeng Gao 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).

  • Long afterglow phosphor and a process for the preparing thereof
    Patent number: 5885483
    Abstract: The invention relates to a long afterglow phosphor and a process for preparing the phosphor, characterized in that the phosphor comprises the sinter expressed by a general formula MO.multidot.(n-x)?a Al.sub.2 O.sub.3.sup..alpha. .div.(1-a)Al.sub.2 O.sub.3.sup..gamma. !.multidot.B.sub.2 O.sub.3 : R, where, M represents and alkaline earth metal, R represents a rare earth element, 0.5<a.ltoreq.0.99, 0.001.ltoreq.x.ltoreq.0.35, and 1.ltoreq.n.ltoreq.8, and a part of M may be replaced with at least one alkaline earth metal selected from Mg, Ca and Ba. R may also use other rare earth elements in addition to Eu as additional activators. The process for preparing the long afterglow phosphor of the present invention comprises several steps, wherein the sintering temperature needs to be 800.degree.-1200.degree. C.
    Type: Grant
    Filed: August 29, 1996
    Date of Patent: March 23, 1999
    Inventors: Qinglong Hao, Pengcheng Li, Jun Li, Baoshan Lu, Jingfeng Gao, Qian Xu