Patents by Inventor Steven P. Henke

Steven P. Henke 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).

  • Handheld transceiver with frequency synthesizer and sub-audible tone squelch system
    Patent number: 4484355
    Abstract: A handheld transceiver providing separate selective communications links for transmission and reception on a single carrier frequency by means of independent carrier and sub-audible tone frequencies in transmit and receive modes. A carrier frequency synthesizer functions as a local oscillator and direct FM modulator, and a Continuous Tone-Coded Squelch System (CTCSS) generates and detects sub-audible tones that are transmitted simultaneously with voice information on a carrier wave. The carrier frequency synthesizer and the CTCSS tone detector/generator operate at frequencies independently determined by data stored in a programmable read only memory such that each channel can be programmed to have a unique carrier and CTCSS tone frequency in both transmit and receive modes.
    Type: Grant
    Filed: April 11, 1983
    Date of Patent: November 20, 1984
    Assignee: Ritron, Inc.
    Inventors: Steven P. Henke, Robert N. Fields