Patents by Inventor Ian D Pearson

Ian D Pearson 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).

  • Portable communication device operable as a relay device only when connected to an external power source
    Patent number: 7224936
    Abstract: A mobile telephone capable of being powered both by an internal power source and by an external power source, includes relay means operable to cause the telephone to relay signals between a base station and another mobile telephone, the relay means being operable only when an external power source is connected and not when it is running off its own internal battery.
    Type: Grant
    Filed: March 11, 2002
    Date of Patent: May 29, 2007
    Assignee: British Telecommunications public limited company
    Inventor: Ian D Pearson
  • Data transmission on optical networks
    Patent number: 5477364
    Abstract: A system for transmitting data cells from a transmitter to a receiver is disclosed with each cell having a fixed format header containing address information and a free format time slice of predetermined duration. The cells may be transmitted on an optical network in which case the cells are routed by an optical switch which reads the header and is transparent to the free format time slice. Second level cells are formed comprising a second level header and a time slice filled with a number of first level cells.
    Type: Grant
    Filed: May 22, 1995
    Date of Patent: December 19, 1995
    Assignee: British Telecommunications public limited company
    Inventor: Ian D. Pearson