Patents by Inventor Daniel R. Donovan

Daniel R. Donovan 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).

  • Binary for penternary (five-level) encoding system
    Patent number: 5191330
    Abstract: A digital data transmission system wherein binary coded data to be transmitted over the system is converted into a five-level (penternary or quinternary) line code prior to transmission over the system and is reconverted to binary data after transmission over the system. The choice of penternary word is conditional on the previous penternary word.
    Type: Grant
    Filed: December 12, 1991
    Date of Patent: March 2, 1993
    Assignee: Northern Telecom Limited
    Inventors: David A. Fisher, Daniel R. Donovan