Patents by Inventor Ullas Chandra Sekhar Pazhayaveetil

Ullas Chandra Sekhar Pazhayaveetil 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).

  • Patent number: 11526240
    Abstract: An input device such as a stylus for providing input to a touch-sensitive surface with reduced sensitivity to leakage current variations over temperature is disclosed. A passive stylus may include one or more diodes in parallel with one or more bleed resistors. The non-linear load of the diode and resistor network can be operative to provide a stylus electric field in response to a stimulation signal from an electronic device that can be capacitively coupled to, and sensed by, the electronic device. The signal sensed by the electronic device can be a function of the total leakage current, which can vary greatly as a function of temperature and frequency. In order to improve performance, the diode and resistor network, including the bleed resistor(s) and diodes within that network, can be selected and/or designed to provide a reduced variation in the leakage current and more accurate stylus detection.
    Type: Grant
    Filed: September 24, 2021
    Date of Patent: December 13, 2022
    Assignee: Apple Inc.
    Inventors: Daniel Jacob Benjamin Bechstein, Ullas Chandra Sekhar Pazhayaveetil, Jason Chueh-Ren Hu, Robert Ubo Liu, Rexford J. Garland, John Stephen Smith, Blake R. Marshall