Patents by Inventor Darrel Scott Cramer

Darrel Scott Cramer 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).

  • Safety cage for gangway
    Patent number: 7216741
    Abstract: A safety cage improves the safety of workers servicing tanker vehicles having top side hatches. A part or parts of the cage can be repositioned to permit the hatch cover to be opened and then can be returned to a safety enchancing position.
    Type: Grant
    Filed: August 30, 2004
    Date of Patent: May 15, 2007
    Assignee: Aluminum Ladder Company
    Inventors: Ellie Harold MacDonald, Darrel Scott Cramer