Patents by Inventor John Szczewski

John Szczewski 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).

  • Weather/environmental padlock
    Patent number: D341766
    Type: Grant
    Filed: August 26, 1992
    Date of Patent: November 30, 1993
    Assignee: Master Lock Company
    Inventors: Bruce E. Zacher, Paul E. Meshke, John Szczewski