Patents by Inventor Joel M. Dahl

Joel M. Dahl 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).

  • Patent number: 5607232
    Abstract: The present application discloses an asphalt drum that is supplied with a forward and rearward insulator ring. This ring is typically constructed of a ceramic insulation such as (THERMO-MAX). The insulation is further encased in a steel shell to protect the ceramic ring and to allow for a durable drive surface. Through the use of the insulation ring the typical steel trunnions may be replaced with multi-ply rubber tires. As these tires wear they may be easily and quickly replaced with readily available stock. In the typical configuration the drum will ride on four tires, two on each ring. One tire on each ring being an idler wheel while the other is a drive wheel. The entire system may also be attached to a semi trailer for transport.
    Type: Grant
    Filed: December 13, 1995
    Date of Patent: March 4, 1997
    Inventor: Joel M. Dahl