Patents by Inventor Joel A. Elftmann

Joel A. Elftmann 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: 3990462
    Abstract: A substrate stripping and cleaning apparatus including a closed bowl with an exhaust vent and a liquid drain, a rotating turntable in the bowl carrying baskets of substrates, a spray post with multiple fluid passages, orifices and spray nozzles directing rinsing spray outwardly against the turntable and substrates, rinsing water manifold pipes on the turntable and revolving therewith and having nozzles directing rinsing water to all portions of the inner surfaces of the bowl, the pipes being supplied with water through passages in the drive shaft for the turntable.
    Type: Grant
    Filed: May 19, 1975
    Date of Patent: November 9, 1976
    Assignee: Fluoroware Systems Corporation
    Inventors: Joel A. Elftmann, Robert S. Blackwood