Patents by Inventor Robert E. A. Logan

Robert E. A. Logan 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: 4137938
    Abstract: Movement of liquid sulphur requires a considerable heat source to maintain the sulphur in liquid form. The present application and method utilizes an outer steel pipe having a liquid sulphur inlet at one end and a liquid sulphur outlet at the other end and at least one heating fluid carrying conduit extending through the outer pipe. Liquid sulphur is pumped in at one end and the majority of this liquid sulphur is maintained in the molten state through out the length of the pipe line by the heating liquid carrying conduit. However an annular shell of solidified sulphur is allowed to form in contact with the inner surface of the wall of the outer pipe so that it acts as a thermal insulator and assists in maintaining the sulphur that is remaining in the liquid state.
    Type: Grant
    Filed: February 17, 1977
    Date of Patent: February 6, 1979
    Inventor: Robert E. A. Logan