Patents by Inventor Stephen J. Croft

Stephen J. Croft 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).

  • Processor configurable for both virtual mode and protected mode
    Patent number: 5541853
    Abstract: A processor system for connection to a communications network comprises a processor and a memory configurable for operation with the processor in at least two modes, a virtual mode and a protected mode in which operation of the processor and memory is dedicated to data transfer between the processor system and a communications network. A switching device is provided for switching between the virtual and protected modes, which is operable under user program control, in response to a data transfer request generated when data is to be transferred between the memory and the communications network. The switching device then switches to the protected mode, such that there is direct data transfer between the memory and the communications network.
    Type: Grant
    Filed: June 8, 1994
    Date of Patent: July 30, 1996
    Assignee: Madge Networks Limited
    Inventor: Stephen J. Croft