Patents by Inventor Stanley L. Hubler

Stanley L. Hubler 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).

  • Bilateral current source for a multi-terminal intercom
    Patent number: 4358644
    Abstract: A bilateral current source operates as a two-wire to four-wire converter circuit for an intercom system. The circuit provides a high impedance current driver for putting a local voice signal on the common line connecting the intercom stations. The same circuit acts as a buffer amplifier for connecting voice signals received on the same line to a listening device such as a speaker. The circuit suppresses any sidetones by preventing the local voice signal from being coupled to the listening device.
    Type: Grant
    Filed: June 17, 1980
    Date of Patent: November 9, 1982
    Assignee: RTS Systems, Inc.
    Inventor: Stanley L. Hubler