Patents by Inventor Man-Hyung Choi

Man-Hyung Choi 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: 6430853
    Abstract: An emergency exit lighting apparatus comprises an emergency exit signal casing, and a mounting bracket mounted on a wall or a ceiling, wherein concave holes are formed in a diagonal direction to be extended to two punched linking holes at a center of one of top and side surfaces of the emergency exit signal casing, and an electric wire guiding hole is formed between the two linking holes. The emergency exit signal casing can be easily attached to the mounting bracket by bring rotated in a clockwise direction and easily detached therefrom by being rotated in an anti-clockwise direction.
    Type: Grant
    Filed: March 11, 1999
    Date of Patent: August 13, 2002
    Assignee: Dong Bang Electronic Industrial Co., Ltd.
    Inventor: Man-Hyung Choi
  • Patent number: 6208257
    Abstract: The present invention relates to an inspection apparatus of an emergency exit light which is mounted on a wall or a ceiling in order to guide people to the emergency exit in a building in an emergency situation, such as a fire. Particularly, the present invention relates to the inspection apparatus of an emergency exit light for checking whether or not the reserve power supply charged in the secondary battery can be supplied to the emergency exit light to automatically turn on the exit light as soon as the domestic power supply which has been supplied to the emergency exit light is cut off due to the occurrence of an emergency situation, such as a fire.
    Type: Grant
    Filed: May 17, 1999
    Date of Patent: March 27, 2001
    Assignee: Dong Bang Electronic Industrial Co., Ltd.
    Inventor: Man-Hyung Choi