Patents by Inventor Erc J. Horvitz

Erc J. Horvitz 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).

  • System and methods for determining the location dynamics of a portable computing device
    Patent number: 7250907
    Abstract: A location system for locating and determining the motion and velocity of a wireless device. The methods include direct inferences about whether a device is in motion versus static based on a statistical analysis of the variation of radio signal strengths over time. The system is trained according to a sparse set of identified locations from which signal strengths are measured. The system uses the signal properties of the identified locations to interpolate for a new location of the wireless device. The system uses a probabilistic graph where the identified locations of the floor plan, expected walking speeds of pedestrians, and independent inference of whether or not the device is in motion are used to determine the new location of the device.
    Type: Grant
    Filed: June 30, 2003
    Date of Patent: July 31, 2007
    Assignee: Microsoft Corporation
    Inventors: John C. Krumm, Erc J. Horvitz
  • System and methods for determining the location dynamics of a portable computing device
    Publication number: 20040263388
    Abstract: A location system for locating and determining the motion and velocity of a wireless device. The methods include direct inferences about whether a device is in motion versus static based on a statistical analysis of the variation of radio signal strengths over time. The system is trained according to a sparse set of identified locations from which signal strengths are measured. The system uses the signal properties of the identified locations to interpolate for a new location of the wireless device. The system uses a probabilistic graph where the identified locations of the floor plan, expected walking speeds of pedestrians, and independent inference of whether or not the device is in motion are used to determine the new location of the device.
    Type: Application
    Filed: June 30, 2003
    Publication date: December 30, 2004
    Inventors: John C. Krumm, Erc J. Horvitz