Patents by Inventor John M. Stefanko

John M. Stefanko 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).

  • Wave configuration for the web of a level frame
    Patent number: 7509749
    Abstract: A molded plastic yet structurally rigid tool, such as a level, with a web extending in a generally undulating configuration. The undulating configuration of the web acts to strengthen and make the level more rigid when compared to a level with a planar web. The undulating configuration of the web is substantially symmetrical about the centerline of the level over its entire length, but may also be arranged in a number of non-planar embodiments.
    Type: Grant
    Filed: October 25, 2006
    Date of Patent: March 31, 2009
    Assignee: Johnson Level & Tool Mfg. Co., Inc.
    Inventor: John M. Stefanko
  • Wave configuration for the web of a level frame
    Patent number: D559713
    Type: Grant
    Filed: October 25, 2006
    Date of Patent: January 15, 2008
    Assignee: Johnson Level & Tool Mfg. Co., Inc.
    Inventor: John M. Stefanko