Patents by Inventor Ralf Karlstrom

Ralf Karlstrom 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: 5514028
    Abstract: The present invention is directed to a single sheet sandpaper delivery system which includes at least one stackable tray having a support surface, with at least two sides, wherein one of each said sides is connected an opposing edge portion of the support surface and extends generally normal thereto, and wherein the support surface has an edge portion laterally spacing the sides.
    Type: Grant
    Filed: January 7, 1994
    Date of Patent: May 7, 1996
    Inventors: Christopher A. Ali, Terry L. Ali, Ralf Karlstrom