Patents by Inventor Carl H. Hall

Carl H. Hall 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).

  • Apparatus and method for detecting small distance changes between opposed surfaces using giant magneto resistance effect sensor
    Patent number: 6278270
    Abstract: A device that can sense small changes in distance between opposed surfaces includes a ferromagnetic material and a giant magneto resistance effect sensor. A current source applies a current to the sensor to operate the sensor and read the magnetic field that impinges on the sensor from the ferromagnetic material. The magnetic field changes when the distance between the opposed surfaces changes. The device can be used in imaging apparatus to sense multifeeds and other conditions.
    Type: Grant
    Filed: October 29, 1999
    Date of Patent: August 21, 2001
    Assignee: Xerox Corporation
    Inventors: Eliud Robles-Flores, Edward W. Schnepf, Douglas A. Gutberlet, Carl H. Hall, Randall C. Ryon, James B. Myers