Patents by Inventor P. I. P. Boulton

P. I. P. 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).

  • Deterministic access protocol local area network
    Patent number: 4777487
    Abstract: A data controller to control passage of data between a plurality of data handling devices comprises a communication link to permit communication of the devices with one another. An indicator is associated with each of the devices to indicate data is to be transmitted from any one of the devices. An inhibitor operates upon a device after it transmits data to inhibit access of that device to the communication link and to the indicator. A reset device is responsive to the indicator to remove the inhibitor when the indicator indicates that no data is to be transmitted.
    Type: Grant
    Filed: July 30, 1986
    Date of Patent: October 11, 1988
    Assignee: The University of Toronto Innovations Foundation
    Inventors: P. I. P. Boulton, E. S. Lee
  • Robust rooted tree network
    Patent number: 4773069
    Abstract: A data transmission network has a plurality of modems to transmit and receive data and a nexus including at least two controllers to control the transmission of data between the modems. Each controller has input ports and output ports with each of the modems being connected to an input port and an output port means on each of the controllers to permit the passage of data between the modems and the controllers. Each of the controllers has one of its outputs connected to an input port of the other of the controllers so that data transmitted by one of the controllers will be transmitted to the input port of another of said controllers. Switches are provided between the controllers to prevent continuous circulation of data between the controllers.
    Type: Grant
    Filed: July 30, 1986
    Date of Patent: September 20, 1988
    Inventors: P. I. P. Boulton, E. S. Lee
  • Deterministic access protocol local area network
    Patent number: RE33650
    Abstract: A data controller to control passage of data between a plurality of data handling devices comprises a communication link to permit communication of the devices with one another. An indicator is associated with each of the devices to indicate data is to be transmitted from any one of the devices. An inhibitor operates upon a device after it transmits data to inhibit access of that device to the communication link and to the indicator. A reset device is responsive to the indicator to remove the inhibitor when the indicator indicates that no data is to be transmitted.
    Type: Grant
    Filed: April 27, 1990
    Date of Patent: July 30, 1991
    Assignee: University of Toronto Innovations Foundation
    Inventors: P. I. P. Boulton, E. S. Lee