Patents by Inventor Duwane R. Ashbaugh

Duwane R. Ashbaugh 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).

  • System for the one-step dewatering of a trench and the construction of a pipeline bed
    Patent number: 4462715
    Abstract: A system for laying a pipeline receiving stone bed in the bottom of a trench into which water may have seeped and there is accordingly some erosion of the trench side walls comprising:moving a stone-filled box along the trench in increments as the trench is dug out ahead of the box while moving earth which has collapsed into the trench forwardly along the trench; and simultaneously dispensing stone out the rear end of the box to form a bed which shores up the sides of the trench and pumping water out of the next section of the trench to receive the bed.
    Type: Grant
    Filed: September 30, 1981
    Date of Patent: July 31, 1984
    Inventor: Duwane R. Ashbaugh