Patents by Inventor Andrew M. Wolff

Andrew M. Wolff 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).

  • Accurately tracking phonograph arm
    Patent number: 4497053
    Abstract: A phonograph tone arm cartridge rotating system that keeps the cartridge perpendicular to the record groove radius by pivoting it with a belt and pulley linkage that does not change length or tension during movement of the tone arm.
    Type: Grant
    Filed: April 9, 1982
    Date of Patent: January 29, 1985
    Inventor: Andrew M. Wolff
  • Circuit means for converting a bipolar input to a unipolar output
    Patent number: 4473757
    Abstract: A circuit which accepts an input signal of either positive or negative polarity and produces an output signal having an open circuit voltage similar in amplitude to the input signal amplitude but having a defined polarity. A plurality of switching elements, preferably MOS transistors, are connected in a bridge circuit, the bridge circuit having a pair of input terminals responsive to the input signal and a pair of output terminals for providing the output signal, the switching elements being connected between the input and output terminals. Each of the switching elements has a control input connected to one of the input terminals whereby each of the switching elements automatically opens or closes in response to the polarity of the input signal to maintain the defined polarity of the output signal.
    Type: Grant
    Filed: December 8, 1981
    Date of Patent: September 25, 1984
    Assignee: Intersil, Inc.
    Inventors: Jules C. Farago, Andrew M. Wolff, David Bingham