Patents by Inventor Frederick M. Pascoe

Frederick M. Pascoe 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).

  • Method and apparatus for code conversion of binary to multilevel signals
    Patent number: 4408189
    Abstract: A method and apparatus for converting a binary signal to one having quaternary-level symbols with no d-c component. To achieve this, the running digital sum is limited by selectively inverting words within each frame of (n) symbols. A separate (n+1)th symbol is added to each frame to indicate the selective inversion of the words, so that the correct polarity of the (n) symbols can be re-established.
    Type: Grant
    Filed: May 18, 1981
    Date of Patent: October 4, 1983
    Assignee: Northern Telecom Limited
    Inventors: Malcolm C. Betts, Alan F. Graves, Frederick M. Pascoe, James E. Dilley