Patents by Inventor Charles Weldon Chapman

Charles Weldon Chapman 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).

  • Patent number: 4038614
    Abstract: Surface acoustic wave devices having broadband characteristics with a desired transfer efficiency of less than unity at a desired center frequency are described, the devices incorporate a multistrip coupler array of a predetermined number N of conductive strips disposed on a piezoelectric substrate which is capable of supporting two tracks of approximately equal widths of propagating surface acoustic wave energy, the array having a tapping portion in one of the tracks and an approximately equal length launching portion in the other of the tracks for launching only a portion of the energy incident on the tapping portion, the strip periods p.sub.1 and p.sub.2 of the two portions being different and the ratio of p.sub.1 /p.sub.2, in conjunction with N, provides the desired characteristic.
    Type: Grant
    Filed: June 16, 1975
    Date of Patent: July 26, 1977
    Assignee: Hughes Aircraft Company
    Inventors: Charles Weldon Chapman, Thomas W. Bristol