Patents by Inventor Mark B. McCormick

Mark B. McCormick 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).

  • Method and apparatus for operating a multiple hearth furnace
    Patent number: 5957064
    Abstract: A multiple hearth furnace having a drying zone, a combustion zone and a cooling zone includes a recirculation loop that recycles exhaust gas from the drying zone to the cooling zone. In some embodiments, a first control loop including a temperature measurement device that measures temperature in the combustion zone controls fan speed of a recirculation fan that drives the recirculation loop. A second control loop monitors recirculation fan temperature and overrides the first control loop if the recirculation fan temperature exceeds a predetermined maximum. A third control loop controls air flow into the furnace.
    Type: Grant
    Filed: November 28, 1997
    Date of Patent: September 28, 1999
    Inventors: Louis T. Barry, Mark B. McCormick