Patents by Inventor Suri Appa

Suri Appa 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).

  • Low power current mode logic
    Patent number: 11831315
    Abstract: High-speed signal propagation circuits are biased by a temperature-compensating signal-swing calibrator to yield a target output signal amplitude across process, voltage and temperature corners, avoiding the power-consumptive over-biasing conventionally employed to avoid under-amplitude conditions in slow-process, low-voltage and/or high temperature conditions.
    Type: Grant
    Filed: July 28, 2022
    Date of Patent: November 28, 2023
    Assignee: Cadence Design Systems, Inc.
    Inventors: Sambasiva Rao Udatha, Uma Suri Appa Rao Kandregula
  • Methods and devices for improving efficiency of wind turbines in low speed sites
    Patent number: 7789624
    Abstract: The present invention is for an apparatus and method for a passive pitchable device for wind turbines comprising: a camshaft having cam grooves engraved; a cylindrical shell; an axial compression spring; said blade assembly and said cylindrical shell are fastened together by screws; a plurality of balls that roll along said cam grooves, and convert the axial displacement to rotation or pitch angle; and wherein the passive pitchable device ensures said blades are at the optimum angle of incidence in the stationary position; as the rotor turns, the net force between centrifugal force on said blade and the resistant force from said compression spring causes the device to move axially outward while rotating to adjust the pitch of the rotor blade so that angle of incidence is optimal for the given wind speed; as the wind speed exceeds the design speed and the centrifugal force on the rotor blade continues to increase, the device continues the move axially outward while rotating in the opposite direction as to adju
    Type: Grant
    Filed: May 3, 2007
    Date of Patent: September 7, 2010
    Inventors: Kari Appa, Suri Appa
  • Methods and devices for improving efficiency of wind turbines in low speed sites
    Publication number: 20070207033
    Abstract: The present invention is for an apparatus and method for a passive pitchable device for wind turbines comprising: a camshaft having cam grooves engraved; a cylindrical shell; an axial compression spring; said blade assembly and said cylindrical shell are fastened together by screws; a plurality of balls that roll along said cam grooves, and convert the axial displacement to rotation or pitch angle; and wherein the passive pitchable device ensures said blades are at the optimum angle of incidence in the stationary position; as the rotor turns, the net force between centrifugal force on said blade and the resistant force from said compression spring causes the device to move axially outward while rotating to adjust the pitch of the rotor blade so that angle of incidence is optimal for the given wind speed; as the wind speed exceeds the design speed and the centrifugal force on the rotor blade continues to increase, the device continues the move axially outward while rotating in the opposite direction as to adju
    Type: Application
    Filed: May 3, 2007
    Publication date: September 6, 2007
    Inventors: Kari Appa, Suri Appa