Patents by Inventor Mark S. Andreasen

Mark S. Andreasen 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).

  • Method and apparatus for driving neon tube to form luminous bubbles and controlling the movement thereof
    Patent number: 4745342
    Abstract: According to the present invention, a portion of an applied commercial AC supply (60 Hz) is rectified, filtered and a controllable oscillator in a pulse width modulator chip serves as a signal generator which has both duty cycle and frequency control adjustments. An output signal is coupled via an impedance matching circuit to the input primary winding of a signal transformer having a pair of secondary windings which drive a pair of tandem connected electronic switches which, in turn, are connected across a second DC supply which has a high direct current voltage derived from the input AC line voltage (110-120 V AC 60 Hz).
    Type: Grant
    Filed: October 30, 1986
    Date of Patent: May 17, 1988
    Inventors: Jack S. Andresen, Mark S. Andreasen