Patents by Inventor Dennis E. Sandmann

Dennis E. Sandmann 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).

  • Expansion bulb for plugging a conduit or passage
    Patent number: 4506706
    Abstract: An expansion bulb for plugging a conduit or passage which includes an expandable sleeve encircling a body and secured to the body by caps securing opposite ends of the sleeve to the body with each end of the sleeves extending into recesses in the body. Pressurized air or fluid is supplied through a passage in the body to cause radial expansion of the sleeve relative to the body.
    Type: Grant
    Filed: May 25, 1983
    Date of Patent: March 26, 1985
    Inventor: Dennis E. Sandmann