Patents by Inventor Joe Hoffman

Joe Hoffman 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).

  • Method and apparatus for continuously blending chemical solutions
    Publication number: 20050029170
    Abstract: Provided are a method and apparatus for continuously blending a chemical solution for use in semiconductor processing. The method involves the step of: mixing a first chemical stream with a second chemical stream in a controlled manner, to form a stream of a solution having a predetermined formulation. The apparatus allows one to practice the above method. The method and apparatus can accurately provide chemical solutions of desired concentration in a continuous manner. The invention has particular applicability in semiconductor device fabrication.
    Type: Application
    Filed: September 13, 2004
    Publication date: February 10, 2005
    Inventors: Karl Urquhart, John Thompson, Joe Hoffman