Patents by Inventor W. F. Noel Stephens

W. F. Noel Stephens 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).

  • Interpolation apparatus
    Patent number: 4949289
    Abstract: An apparatus for determining values of a periodic function by interpolation which comprises a reading device for receiving scanning signals A,B,C,D nominally in phase quadrature with each other from the periodic function. The signals are combined in a converter to produce sine and cosine derived signals SN,CS from which interpolation is performed by a computer. Each of the derived signals SN,CS is derived from at least three of the scanning signals A,B,C,D, for example, in the forms 2B-A-D and 2B-A-B.
    Type: Grant
    Filed: February 9, 1988
    Date of Patent: August 14, 1990
    Assignee: Renishaw plc
    Inventors: W. F. Noel Stephens, Mark E. Pleydell