Patents by Inventor Philip M. Roybal

Philip M. Roybal 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).

  • Communication method and system
    Patent number: 4295124
    Abstract: This communication system reduces required data transmission channel capacity by encoding source words into encoded words with usually less binary bits for transmission. Features of the invention include a hashing algorithm which transforms the source words into psuedorandom code words used for both transmission and addresses in a vocabulary memory. Before transmission each source word and its hash code is checked against a pre-recorded vocabulary memory to decide which should be transmitted.
    Type: Grant
    Filed: August 13, 1979
    Date of Patent: October 13, 1981
    Assignee: National Semiconductor Corporation
    Inventor: Philip M. Roybal