Patents by Inventor Philip Boulton

Philip Boulton 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 and system for maintaining synchronization in low-power mode over a frequency hopping radio link
    Patent number: 7577180
    Abstract: Systems and methods for maintaining synchronization of a base unit and a portable unit in a low-power mode are provided. The base unit and the portable unit communicate with each other via wireless frequency hopping radio communications links. The base unit and the portable unit switch to a synchronization state in a synchronization period during the low-power mode. During the synchronization period, the base unit transmits one of a first and a second link synchronization messages. The portable unit is required to respond to the second link synchronization. If the base unit receives a response from the portable unit within a predetermined number of periods, the base unit and the portable unit switch back to the low-power mode. Otherwise, the base unit and the portable unit are switched to a SEARCH state to search for a synchronized communications channel.
    Type: Grant
    Filed: December 18, 2003
    Date of Patent: August 18, 2009
    Assignee: VTech Telecommunications Limited
    Inventor: Philip A. Boulton
  • Method and system for maintaining synchronization in low-power mode over a frequency hopping radio link
    Publication number: 20050136882
    Abstract: Systems and methods for maintaining synchronization of a base unit and a portable unit in a low-power mode are provided. The base unit and the portable unit communicate with each other via wireless frequency hopping radio communications links. The base unit and the portable unit switch to a synchronization state in a synchronization period during the low-power mode. During the synchronization period, the base unit transmits one of a first and a second link synchronization messages. The portable unit is required to respond to the second link synchronization. If the base unit receives a response from the portable unit within a predetermined number of periods, the base unit and the portable unit switch back to the low-power mode. Otherwise, the base unit and the portable unit are switched to a SEARCH state to search for a synchronized communications channel.
    Type: Application
    Filed: December 18, 2003
    Publication date: June 23, 2005
    Inventor: Philip Boulton