Patents by Inventor Ralph W. Coho

Ralph W. Coho 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: 4072435
    Abstract: Method and apparatus for maintaining a road or the like wherein liquid asphalt cement and aggregate are separately carried to a job site. The temperature of both of these is maintained within a range of from about 70.degree. F. to about 250.degree. F. for the aggregate and a range of from about 100.degree. F. to about 195.degree. F. for the liquid asphalt cement. The aggregate is metered onto delivery means and delivered thereby to a mixing means. The liquid asphalt cement is pumped from its container to the mixing means whereupon the aggregate and the liquid asphalt cement are mixed together and delivered to a spreading means. In addition, a filler hopper and metering means for filler material can be provided as well as a second tank for water with associated metering and piping means can be used. Two specific embodiments of the mixing means are presented, namely, a homogenizing mixer and a mix-conveyor. Auxiliary power means are provided for powering the moving elements of the apparatus.
    Type: Grant
    Filed: November 11, 1976
    Date of Patent: February 7, 1978
    Assignee: IRL Daffin Associates, Inc.
    Inventors: Ralph W. Coho, John L. Kugle, Robert C. Futty