Patents by Inventor Sheldon D. Klein

Sheldon D. Klein 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).

  • Paperboard chair of unitary construction
    Patent number: 4085970
    Abstract: A unitary chair of relatively stiff corrugated paperboard formed from a single die-stamped and scored blank, characterized in that it constitutes a base including side panels provided with a pair of opposed slots which are adapted to receive and to lock in interengagement the free ends of both a pivotal seat panel and a pivotal back rest panel. The slots are formed at the junctures of the seat supporting edges of the side panels with the back rest supporting edges of the side panels.
    Type: Grant
    Filed: July 21, 1976
    Date of Patent: April 25, 1978
    Assignee: Chippewa Paper Products Company
    Inventor: Sheldon D. Klein