Patents by Inventor Dongquan Fang

Dongquan Fang 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).

  • Heating apparatus of induction furnace used for stretching large-diameter preformed rods of optical fibers
    Patent number: 8950218
    Abstract: A heating apparatus of an induction furnace used for stretching large-diameter preformed rods of optical fibers, said heating apparatus of the induction furnace comprising a furnace casing, a graphite exothermic sleeve, an insulating layer and an induction coil. At the upper end of the graphite exothermic sleeve is provided a floating seal gland, the inner bore thereof being adapted to the upper end of the graphite exothermic sleeve, and the outer periphery of the floating seal gland being adapted to the top cover plate furnace hole of the furnace casing. The use of the floating seal gland increases furnace stability and prolongs furnace life.
    Type: Grant
    Filed: November 15, 2011
    Date of Patent: February 10, 2015
    Assignee: Yangze Optical Fibre and Cable Company Ltd.
    Inventors: Dongquan Fang, Tao Wang, Jianhua Sun
  • HEATING APPARATUS OF INDUCTION FURNACE USED FOR STRETCHING LARGE-DIAMETER PREFORMED RODS OF OPTICAL FIBERS
    Publication number: 20140041416
    Abstract: A heating apparatus of an induction furnace used for stretching large-diameter preformed rods of optical fibers, said heating apparatus of the induction furnace comprising a furnace casing, a graphite exothermic sleeve, an insulating layer and an induction coil. At the upper end of the graphite exothermic sleeve is provided a floating seal gland, the inner bore thereof being adapted to the upper end of the graphite exothermic sleeve, and the outer periphery of the floating seal gland being adapted to the top cover plate furnace hole of the furnace casing. The use of the floating seal gland increases furnace stability and prolongs furnace life.
    Type: Application
    Filed: November 15, 2011
    Publication date: February 13, 2014
    Inventors: Dongquan Fang, Tao Wang, Jianhua Sun