Patents by Inventor Duane D. Barth

Duane D. Barth 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).

  • Sign post
    Patent number: 4326352
    Abstract: A sign post has a hollow post with a cross arm assembly inserted into the upper end of a post and a stake inserted into the lower end. Hooks and a slotted member are attached to the horizontal tube of the cross arm assembly. A first sign may be hung from the hooks while a second sign may be inserted into the slotted member. Stake includes expander elements for snugly fitting within post and a plate for preventing the sign post from turning in the wind.
    Type: Grant
    Filed: December 6, 1979
    Date of Patent: April 27, 1982
    Assignee: Heritage Products Intl., Inc.
    Inventor: Duane D. Barth