Patents by Inventor Leslie Van Valkenburgh

Leslie Van Valkenburgh 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).

  • Ladder
    Patent number: 4102433
    Abstract: An extension roof ladder is disclosed having conventional extension ladder sections for use at the side of a building and connected thereto a flexible roof ladder section having a plurality of shorter subsections for use on the near side of a roof and one relatively longer rigid subsection hinged to the top shorter subsection for use on the far side of the roof.
    Type: Grant
    Filed: February 18, 1977
    Date of Patent: July 25, 1978
    Inventor: Leslie Van Valkenburgh