Patents by Inventor R. Frank Bell

R. Frank Bell 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: 4669003
    Abstract: This method and apparatus for eliminating apparent offset in the servo code adjacent to a guard band on a magnetic memory disc utilizes at least two phases of servo code per magnetic cell for seeking and track centering, or track following, operations and two phases or guard band code per magnetic cell. The two phases or guard band code are each either in phase or similarly out of phase with the respective phases of the servo code in individual magnetic cells.Phase locking on a selected phase of guard band code is achieved by providing a synchronizing code in the guard band using an irregular pattern of guard band code, providing a timing signal count representing a cell count, for example, decoding the synchronizing code to provide an end of code signal and utilizing the end of code signal and a predetermined cell count signal to achieve phase locking on the correct phase of the guard band code.
    Type: Grant
    Filed: May 2, 1986
    Date of Patent: May 26, 1987
    Assignee: Hewlett-Packard Company
    Inventors: R. Frank Bell, Roger V. Wilcox
  • Patent number: 4446440
    Abstract: An apparatus amplifies a signal in two different modes. The apparatus amplifies the signal in a linear mode when the voltage of the signal is much less than the voltage of the power source, and in a switching mode when the signal is at other voltages.
    Type: Grant
    Filed: January 26, 1982
    Date of Patent: May 1, 1984
    Assignee: Hewlett-Packard Company
    Inventor: R. Frank Bell