Patents by Inventor Robert L. Isenmann

Robert L. Isenmann 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).

  • Separable key holder
    Patent number: 3979934
    Abstract: A releasable key ring connector comprises plug and socket members shaped to fit together snugly but to separate upon pressure placed on one of them. Key supporting means on each member accommodate separate key rings.
    Type: Grant
    Filed: May 14, 1975
    Date of Patent: September 14, 1976
    Assignee: Penn Corporation
    Inventor: Robert L. Isenmann