Patents by Inventor Richard Gaster

Richard Gaster 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).

  • Temperature and drift compensation in magnetoresistive sensors
    Patent number: 8405385
    Abstract: Double modulation of a magnetoresistive sensor entails modulating both an excitation (e.g., voltage or current) applied to the sensor and a tickling magnetic field applied to the sensor. The excitation and magnetic field are modulated at different frequencies fc and ff, respectively. As a result of the double modulation, the sensor output spectrum includes a carrier tone (CT) at frequency fc and side tones (STs) at frequencies fc±ff. A baseline relation between CT amplitude and ST amplitude is determined (e.g., by measuring CT and ST amplitude while drift occurs in the absence of a sample). During sensor operation, raw ST measurements are corrected using corresponding raw CT measurements to provide corrected ST measurements as the sensor output.
    Type: Grant
    Filed: March 10, 2010
    Date of Patent: March 26, 2013
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Drew A. Hall, Richard Gaster, Sebastian J. Osterfeld, Shan X. Wang
  • Temperature and drift compensation in magnetoresistive sensors
    Publication number: 20100231203
    Abstract: Double modulation of a magnetoresistive sensor entails modulating both an excitation (e.g., voltage or current) applied to the sensor and a tickling magnetic field applied to the sensor. The excitation and magnetic field are modulated at different frequencies fc and ff, respectively. As a result of the double modulation, the sensor output spectrum includes a carrier tone (CT) at frequency fc and side tones (STs) at frequencies fc±ff. A baseline relation between CT amplitude and ST amplitude is determined (e.g., by measuring CT and ST amplitude while drift occurs in the absence of a sample). During sensor operation, raw ST measurements are corrected using corresponding raw CT measurements to provide corrected ST measurements as the sensor output.
    Type: Application
    Filed: March 10, 2010
    Publication date: September 16, 2010
    Inventors: Drew A. Hall, Richard Gaster, Sebastian J. Osterfeld, Shan X. Wang