Patents by Inventor Tony S. Partow

Tony S. Partow 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).

  • High voltage stylus for portable computer
    Patent number: 6377248
    Abstract: The invention concerns a stylus for producing a high-voltage, sinusoidal signal for an electrostatic digitizing pad. The high voltage is obtained by applying a sine wave to one lead of the primary of a transformer, and applying the inverse of the sine wave to the other lead of the primary. The secondary of the transformer produces the high voltage, which is developed into a signal which is applied to the digitizing pad.
    Type: Grant
    Filed: September 30, 1999
    Date of Patent: April 23, 2002
    Inventors: Tony S. Partow, Carl M. Stanchak
  • High voltage stylus for portable computers
    Patent number: 5994651
    Abstract: The invention concerns a stylus for producing a high-voltage, sinusoidal signal for an electrostatic digitizing pad. The high voltage is obtained by applying a sine wave to one lead of the primary of a transformer, and applying the inverse of the sine wave to the other lead of the primary. The secondary of the transformer produces the high voltage, which is developed into a signal which is applied to the digitizing pad.
    Type: Grant
    Filed: March 14, 1997
    Date of Patent: November 30, 1999
    Assignees: Hyundai Electronics America, NCR Corporation
    Inventors: Tony S. Partow, Carl M. Stanchak
  • Cancellation of common-mode signals in digitizing tablet
    Patent number: 5945639
    Abstract: The invention concerns apparatus for processing signals induced by a stylus applied to a digitizing tablet. The tablet produces four signals, A, B, C, and D, indicative of four currents, induced at four different points on the tablet, by the stylus. The four signals indicate the position of the stylus. The invention derives stylus position based solely on two difference pairs (A-D) and (B-C). Further, the computation of the difference-pairs suppresses common-mode noise, which otherwise interferes with computation of stylus position.
    Type: Grant
    Filed: February 4, 1994
    Date of Patent: August 31, 1999
    Assignee: Hyundai Electronics America
    Inventors: Tony S. Partow, William K. Petty
  • High voltage stylus for portable computer
    Patent number: 5828011
    Abstract: The invention concerns a stylus for producing a high-voltage, sinusoidal signal for an electrostatic digitizing pad. The high voltage is obtained by applying a sine wave to one lead of the primary of a transformer, and applying the inverse of the sine wave to the other lead of the primary. The secondary of the transformer produces the high voltage, which is developed into a signal which is applied to the digitizing pad.
    Type: Grant
    Filed: February 4, 1994
    Date of Patent: October 27, 1998
    Assignees: AT&T Global Information Solutions Company, Hyundai Electronics America, Symbios Logic Inc.
    Inventors: Tony S. Partow, Carl M. Stanchak
  • Integrated circuit oscillator with high voltage feedback network
    Patent number: 5457434
    Abstract: An oscillator circuit having an amplifier and feedback loop multiplies a generated signal by appropriate selection of capacitance ratios in the feedback loop. In order to isolate this multiplied, high voltage signal, a voltage divider is used to isolate the high voltage portion from the input and output (I/O) of an integrated circuit oscillator core. The multiplied voltage creates a high voltage signal suitable for stylus signal transmission. The divided, and relatively low, voltage is used in the feedback path to stabilize the oscillator core's operation.
    Type: Grant
    Filed: March 31, 1994
    Date of Patent: October 10, 1995
    Assignees: AT&T Global Information Solutions Company, Hyundai Electronics America
    Inventor: Tony S. Partow