Patents by Inventor Doo-Whan Kang

Doo-Whan Kang 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).

  • Publication number: 20070215510
    Abstract: Disclosed herein is a vacuum vessel, capable of maintaining the freshness of food contained in the vessel for a lengthy period of time by creating a vacuum in the vessel. The vacuum vessel includes a main body (10) having along an edge thereof an annular protrusion. A seat (15) is disposed in the main body to seat an exterior receptacle containing food therein. A cover (20) covers the main body, and includes a valve mount part and a packing groove defined between inner and outer rings at a position corresponding to the annular protrusion of the main body. A packing (25) is fitted into the packing groove, and has an insert groove to engage with the annular protrusion of the main body, and an extension part to enhance a seal. A check valve (30)(130)(230) is mounted to the valve mount part of the cover.
    Type: Application
    Filed: January 28, 2005
    Publication date: September 20, 2007
    Inventors: Yi-Je Sung, Doo-Whan Kang, Se-Jin Lee, Hyun-Ki Lee
  • Patent number: 7070704
    Abstract: Disclosed is an environment-friendly, pH-neutral, loaded stream extinguishant and a method for preparing the same. The extinguishant is prepared from a mixture of a fire extinguishable component, an organic acid, a surfactant and water. It is very effective in controlling A class fires, as well as showing excellent flame retardance. Also, the extinguishant is neutral in pH so as to neither corrode extinguisher parts, nor affect soil negatively. It can be also applied to portable extinguishers.
    Type: Grant
    Filed: January 16, 2003
    Date of Patent: July 4, 2006
    Assignee: Fire & Tech Co., Ltd.
    Inventors: Jung Kang, Doo-Whan Kang, Chang-Woo Lee, Jae-Dong Jung
  • Publication number: 20050116193
    Abstract: Disclosed is an environment-friendly, pH-neutral, loaded stream extinguishant and a method for preparing the same. The extinguishant is prepared from a mixture of a fire extinguishable component, an organic acid, a surfactant and water. It is very effective in controlling A class fires, as well as showing excellent flame retardance. Also, the extinguishant is neutral in pH so as to neither corrode extinguisher parts, nor affect soil negatively. It can be also applied to portable extinguishers.
    Type: Application
    Filed: January 16, 2003
    Publication date: June 2, 2005
    Inventors: Jung Kang, Doo-Whan Kang, Chang-Woo Lee, Jac-Dong Jung