Patents by Inventor Kwok Keung Choi

Kwok Keung 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).

  • Method for dynamically changing control frames for selective call receiving devices
    Patent number: 5923266
    Abstract: A selective call receiving device (10) such as a pager is controlled to dynamically change a base frame assigned to the device and subsequent control frames derived therefrom. The time that the device is operative to look for its address in a received signal can thus be dynamically changed to improve the efficiencies of a mixed systems environment without substantially reducing the battery life of the selective call receiving device (10). In two embodiments of the invention a new base frame for the device is derived from an originally assigned base frame that is stored in the selective call receiving device. In another embodiment, a new base frame for the device is derived from the device's address along with frame management information that is received by the selective call receiving device.
    Type: Grant
    Filed: January 23, 1998
    Date of Patent: July 13, 1999
    Assignee: Motorola
    Inventors: Zhonghe Wang, Kwok Keung Choi, Jyh-Han Lin, Douglas I. Ayerst, Gregory Lewis Cannon, Jheroen Pieter Dorenbosch, Malik Khan, Leonard Nelson
  • Method and apparatus for mixing protocols in a radio messaging system
    Patent number: 5878035
    Abstract: A method and apparatus allocates a first predetermined plurality of frame time slots (102) to a first protocol, and allocates a second predetermined plurality of frame time slots (102) to a second protocol having a base frame management capability. The base frame management capability is applied such that portable selective call receiving devices (10) utilizing the second protocol normally perform battery saving throughout the first predetermined plurality of frame time slots (102).
    Type: Grant
    Filed: May 23, 1997
    Date of Patent: March 2, 1999
    Assignee: Motorola, Inc.
    Inventors: Zhonghe Wang, Kwok Keung Choi, Jyh-Han Lin, Douglas I. Ayerst, Gregory Lewis Cannon, Jheroen Pieter Dorenbosch, Malik Khan, Leonard Nelson
  • Apparatus for message re-transmission on demand
    Patent number: 5694454
    Abstract: A communication system (100) providing analog message re-transmission on demand comprises a base station (114) and at least one portable communication transceiver (118). The base station (114) transmits an address (414) identifying the portable communication transceiver (118) to which a voice message is directed, and a session number (415) modulated in a first modulation format and a compressed analog message (418) representing the voice message modulated in a second modulation format. When the signal quality of the voice message played back in the portable communication transceiver (118) is perceived by the user to be unintelligible, the user can receive from the base station (114) a re-transmission of the compressed analog message (418) by generating a request for re-transmission of the compressed analog message (418).
    Type: Grant
    Filed: May 4, 1995
    Date of Patent: December 2, 1997
    Assignee: Motorola, Inc.
    Inventors: Thomas Casey Hill, Kwok Keung Choi, Tri Thien Dang, Lowell C. Hufferd, III