Patents by Inventor Tae Hwan Joo

Tae Hwan Joo 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).

  • Patent number: 9337778
    Abstract: A bias circuit may include an envelope detecting unit detecting an envelope of an input signal, a source voltage generating unit generating a source voltage using a power supply voltage, and an envelope amplifying unit receiving the power supply voltage and the source voltage as a driving voltage and amplifying an envelope signal detected by the envelope detecting unit to generate a first bias voltage.
    Type: Grant
    Filed: September 26, 2014
    Date of Patent: May 10, 2016
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Chan Yong Jeong, Gyu Suck Kim, Song Cheol Hong, Tae Hwan Joo
  • Publication number: 20150244326
    Abstract: A bias circuit may include an envelope detecting unit detecting an envelope of an input signal, a source voltage generating unit generating a source voltage using a power supply voltage, and an envelope amplifying unit receiving the power supply voltage and the source voltage as a driving voltage and amplifying an envelope signal detected by the envelope detecting unit to generate a first bias voltage.
    Type: Application
    Filed: September 26, 2014
    Publication date: August 27, 2015
    Inventors: Chan Yong JEONG, Gyu Suck KIM, Song Cheol HONG, Tae Hwan JOO
  • Patent number: 7637188
    Abstract: A workpiece ejecting device for a machine tool, in which the ejecting bar cannot be rotatably driven at the time of high velocity rotation of the spindle to thereby prevent occurrence of vibration, noise and frictional heat, and so that the workpiece can be ejected smoothly. The workpiece ejecting device comprises: a front bearing unit installed at an inner peripheral surface of a front end portion of the drawing tube; an ejecting cylinder located behind the chucking cylinder and installed directly on an axial line identical with that of the front bearing unit, and an ejecting rod, wherein the ejecting rod is provided at a center axis thereof with at least one fluid passing opening through which fluid for removing alien materials is supplied, and a front end of the ejecting rod is installed to be supported by the front bearing unit.
    Type: Grant
    Filed: September 19, 2005
    Date of Patent: December 29, 2009
    Assignee: Doosan Infracore Co., Ltd.
    Inventors: Tae Hwan Joo, Kyeong Sik Kwon