Patents by Inventor Peter Alexander Birnie

Peter Alexander Birnie 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).

  • Digital switching center
    Patent number: 4060698
    Abstract: A switching center having a plurality of sets of buffer stores for connecting the channels of a plurality of pulse code modulated signal systems to the inputs of a multiplexer in which there is provided a unit for generating a false busy signal to prevent the reading of a buffer store at a time close to the time of writing into the store to reduce the possibility of simultaneous reading and writing and the consequent corruption of information.
    Type: Grant
    Filed: May 11, 1976
    Date of Patent: November 29, 1977
    Assignee: Post Office
    Inventor: Peter Alexander Birnie