Patents by Inventor William Wiseman

William Wiseman 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).

  • Determining endpoint in etching processes using principal components analysis of optical emission spectra with thresholding
    Patent number: 6238937
    Abstract: A method is provided for determining an etch endpoint. The method includes collecting intensity data representative of optical emission spectral wavelengths during a plasma etch process. The method further includes analyzing at least a portion of the collected intensity data into at most first and second Principal Components with respective Loadings and corresponding Scores. The method also includes determining the etch endpoint using the respective Loadings and corresponding Scores of the second Principal Component as an indicator for the etch endpoint using thresholding applied to the respective Loadings of the second Principal Component.
    Type: Grant
    Filed: January 26, 2000
    Date of Patent: May 29, 2001
    Assignee: Advanced Micro Devices, Inc.
    Inventors: Anthony John Toprac, Joseph William Wiseman, Hongyu Yue
  • Plasticized hydrogenated nitrile rubber
    Patent number: 5068275
    Abstract: This invention provides a plasticized hydrogenated nitrile composition. The composition of the present invention must contain a peroxide vulcanization system and a specific type of plasticizer. Vulcanizates according to the invention have superior resistance to hot air ageing in comparison to conventionally plasticized compositions, and most surprisingly, in comparison to non-plasticized compositions. The compositions of the present invention may be used to prepare hoses, seals, gaskets and other rubber goods.
    Type: Grant
    Filed: October 5, 1990
    Date of Patent: November 26, 1991
    Assignee: Polysar Rubber Corporation
    Inventor: William A. Wiseman