Patents by Inventor David J. Hayward

David J. Hayward 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).

  • Apparatus for locating programs resident on a cartridge of a cartridge programmable communication system
    Patent number: 4703416
    Abstract: A communication system controller is operable under program calls from two memories which are independently changeable. A first memory includes a group of hardware-dependent programs and a second memory includes a group of hardware-independent programs. Calls are initiated by programs resident on the first memory to an interface program resident on the second memory at an address known to programs of the first memory. This interface program call includes an argument indentifyng the function program to be called. The interface program uses the argument to determine the location of the function program from a program table and then transfers control to the function program.
    Type: Grant
    Filed: September 19, 1985
    Date of Patent: October 27, 1987
    Assignees: American Telephone and Telegraph Company, Bell Telephone Laboratories, Incorporated
    Inventors: Joseph A. Crupi, David J. Hayward, David F. Jones