Patents by Inventor David D. Schumacher

David D. Schumacher 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: 4801335
    Abstract: In a chemical processing system for processing substrates or wafers in the production of electronic devices or integrated circuit chips, a rinsing step of simultaneously thoroughly rinsing the substrate in the processing chamber while the chemical supply lines and chemical spray posts are also being thoroughly rinsed with rinse water directed down a drain and without spraying into the processing chamber by controlling the pressure or rate of flow of rinsing water through the liquid chemical supply lines and chemical spray post passages and orifices so that most of the rinsing water will flow through an open drain valve and down the drain and only a trickle of water is permitted to flow outwardly through the spray orifices of the chemical spray post so that none of the rinsing water with dilute traces of chemical is sprayed onto the substrates in the processing chamber.
    Type: Grant
    Filed: December 12, 1986
    Date of Patent: January 31, 1989
    Assignee: FSI Corporation
    Inventors: Don C. Burkman, David D. Schumacher, Charlie A. Peterson
  • Patent number: 4682615
    Abstract: In a chemical processing system for processing substrates or wafers in the production of electronic devices or integrated circuit chips, a rinsing step of simultaneously thoroughly rinsing the substrate in the processing chamber while the chemical supply lines and chemical spray posts are also being thoroughly rinsed with rinse water directed down a drain and without spraying into the processing chamber by controlling the pressure or rate of flow of rinsing water through the liquid chemical supply lines and chemical spray post passages and orifices so that most of the rinsing water will flow through an open drain valve and down the drain and only a trickle of water is permitted to flow outwardly through the spray orifices of the chemical spray post so that none of the rinsing water with dilute traces of chemical is sprayed onto the substrates in the processing chamber.
    Type: Grant
    Filed: July 2, 1984
    Date of Patent: July 28, 1987
    Assignee: FSI Corporation
    Inventors: Don C. Burkman, David D. Schumacher, Charlie A. Peterson
  • Patent number: 4595222
    Abstract: A handle attachable to the end panel of a wafer carrier having a pair of opposing clamp jaws interconnected by an elongate articulated frame which includes a mechanism for producing movement of the jaws toward or away from each other, a grip bar for grasping the handle and retaining rods for traversing the open side of the carrier and to retain wafers within the carrier.
    Type: Grant
    Filed: September 28, 1984
    Date of Patent: June 17, 1986
    Assignee: FSI Corporation
    Inventor: David D. Schumacher