Patents by Inventor Richard Markuszewski

Richard Markuszewski 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).

  • Material separation efficiency determination employing fluorescing control particles
    Patent number: 5024753
    Abstract: An improved material separation system and method utilizing control particles of generally known physical characteristics as tracer particles through the separation process. The control particles are generally the same or similar to the materials being separated and are coated with or bonded to a fluorescing dye. The control particles are mixed with the material to be separated prior to separation. The mixture is imposed with a energy source which excites the fluorescent dye causing fluorescing emission. The fluorescing emission is detected at the output of the separation of the mixture to determine if the separation is operating efficiently and as desired.
    Type: Grant
    Filed: October 3, 1989
    Date of Patent: June 18, 1991
    Assignee: Iowa State University Research Foundation, Inc.
    Inventors: Colin D. Chriswell, Richard Markuszewski, William H. Buttermore
  • Chemical cleaning of coal by molten caustic leaching after pretreatment by low-temperature devolatilization
    Patent number: 4859212
    Abstract: Pretreatment of coal by devolatization at temperatures ranging from about 420.degree. C. to about 450.degree. C. for from about 10 minutes to about 30 minutes before leaching with molten caustic leads to a significant reduction in carbonate formation, greatly reducing the cost of cleaning coal on a per ton basis.
    Type: Grant
    Filed: September 15, 1988
    Date of Patent: August 22, 1989
    Assignee: Iowa State University Research Foundation, Inc.
    Inventors: Colin D. Chriswell, Surender M. Kaushik, Navin D. Shah, Richard Markuszewski