Patents by Inventor Frank E. Ziegelmann

Frank E. Ziegelmann 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).

  • Extension ladder hoist
    Patent number: 4128228
    Abstract: A support having a hoist for raising and lowering articles from one elevation to another in which one portion of the support is a ladder.
    Type: Grant
    Filed: June 9, 1977
    Date of Patent: December 5, 1978
    Inventor: Frank E. Ziegelmann