Patents by Inventor Hungkun Chang

Hungkun Chang 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: 20070272328
    Abstract: A universal funnel comprises a tapered hollow body and a tube-like enclosure. The tapered hollow body has an exterior and an interior and has a wide end defining a wide inlet opening and a narrow end defining a narrow outlet opening. The tube-like enclosure has an exterior and an interior and has one end defining an attached end and the other end defining an opened end. The size of the attached end of the tube-like enclosure is larger than the size of the narrow outlet opening of the tapered hollow body. And the size of the attached end of the tube-like enclosure is equal to or smaller than the size of the wide inlet opening of the tapered hollow body. The attached end of the tube-like enclosure is attached to the exterior surface of the tapered hollow body by first introducing the narrow outlet opening of the tapered hollow body into the attached end of the tube-like enclosure till the attached end of the tube-like enclosure is in contact with the exterior surface of the tapered hollow body.
    Type: Application
    Filed: May 25, 2006
    Publication date: November 29, 2007
    Inventor: Hungkun Chang
  • Publication number: 20070252463
    Abstract: A dynamo system comprises a flywheel mounted on a shaft intermediate its ends. A circular track means includes an inward groove structure to keep the ends of the shaft tracked inside while the flywheel rotating and spinning. The circular track means further includes a mechanism to allow a coupling means dangling around. The pair of coupling means for bearing the shaft ends and dangling the shaft ends inside the circular track means so that the shaft ends will move freely along the circular course of the circular track means while the flywheel rotating and spinning. The coupling means includes a bearing to carry a shaft's end. The coupling means further includes a mechanism to dangle the bearing around the course of the circular track means. A frame holds the circular track means. The cavity of the frame has sufficient space so that the flywheel can rotate and spin freely. A plurality of permanent or electro magnets are mounted in spaced relationship on the rim of the flywheel.
    Type: Application
    Filed: April 27, 2006
    Publication date: November 1, 2007
    Inventor: Hungkun Chang
  • Patent number: 5625882
    Abstract: A power management technique for use in an wireless communication system having a service access point and a plurality mobile battery powered user devices, user devices in communication with each other and with the access point, power management technique for determining when a user device may transition from an active mode of operation to a sleep mode of operation and further for determining when a user device in the sleep mode of operation should transition to the active mode of operation.
    Type: Grant
    Filed: August 11, 1995
    Date of Patent: April 29, 1997
    Assignee: Motorola, Inc.
    Inventors: Frederick W. Vook, Mark Demange, Hungkun Chang, William K. Doss
  • Patent number: 5560021
    Abstract: A power management and packet delivery method for use in a wireless local area network (LAN) having a plurality of mobile battery powered user devices, the user devices in communication with each other, the power management and packet delivery technique for determining when a user device may transition from an active mode of operation to a sleep mode of operation and further for determining when a user device in the sleep mode of operation should transition to the active mode of operation. The method further operative to inform an intended destination device that data is forthcoming, thereby prohibiting that device from entering the sleep mode until after the data has been delivered.
    Type: Grant
    Filed: April 4, 1994
    Date of Patent: September 24, 1996
    Inventors: Frederick W. Vook, Mark Demange, Hungkun Chang