Patents by Inventor Paul H. Stevers

Paul H. Stevers 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: 6176188
    Abstract: A method is provided for controlling the hydrocarbon release rate during thermal processing of materials having a variable caloric content.
    Type: Grant
    Filed: July 12, 1999
    Date of Patent: January 23, 2001
    Inventors: Paul H. Stevers, Roger D. Eshleman, Earl H. Sigman, John Kevin Pollard
  • Patent number: 6055916
    Abstract: A material processing apparatus includes a casing having a top and bottom and a plurality of sides defining a pyrolysis chamber for receiving and pyrolyzing feed materials therein into fluid materials and a mass of refractory material disposed upon the bottom of the casing and spaced below the top thereof and extending between its sides. The refractory mass includes an upper surface defining a bottom of the pyrolysis chamber and having an end spaced from a first one of the casing sides to define an ash residue collection cavity therebetween. The apparatus also includes a system of tunnels defined within the refractory mass being spaced below the upper surface thereof.
    Type: Grant
    Filed: May 13, 1998
    Date of Patent: May 2, 2000
    Inventors: Paul H. Stevers, Roger D. Eshleman, Earl H. Sigman, John Kevin Pollard
  • Patent number: 6050204
    Abstract: A material processing apparatus includes a casing having a top and bottom and a plurality of sides defining a pyrolysis chamber for receiving and pyrolyzing feed materials therein into fluid materials and a mass of refractory material disposed upon the bottom of the casing and spaced below the top thereof and extending between its sides. The refractory mass includes an upper surface defining a bottom of the pyrolysis chamber and having an end spaced from a first one of the casing sides to define an ash residue collection cavity therebetween. The apparatus also includes a system of tunnels defined within the refractory mass being spaced below the upper surface thereof.
    Type: Grant
    Filed: May 13, 1998
    Date of Patent: April 18, 2000
    Inventors: Paul H. Stevers, Roger D. Eshleman, Earl H. Sigman, John Kevin Pollard
  • Patent number: 5501159
    Abstract: In a hydrocarbon release rate controlling method, a first chamber is provided capable of receiving successive batches of feed materials for thermal processing having widely varying energy content, heating is produced in the first chamber to cause pyrolyzing of the feed materials into fluid materials, a second chamber is provided communicating with the first chamber and capable of receiving the fluid materials from the first chamber and communicating the fluid materials to a discharge location, heating is produced in the second chamber to cause oxidizing of the fluid materials into discharge gases reaching the discharge location, a jacketed vessel is provided defining a channel surrounding the first and second chambers containing a flow of coolant fluid through the channel, separate variable flows of primary and secondary air are respectively produced into and through the first and second chambers, the temperatures in the first and second chambers are sensed, the temperature of the coolant in the channel of th
    Type: Grant
    Filed: July 29, 1994
    Date of Patent: March 26, 1996
    Assignee: Bio-Oxidation, Inc.
    Inventors: Paul H. Stevers, Roger D. Eshleman
  • Patent number: 5353719
    Abstract: An apparatus for controlled processing of materials includes a coolant jacketed vessel defining a first pyrolysis chamber and a second oxidation chamber, first heating elements mounted in the vessel to pyrolyze materials in the first chamber, second heating elements mounted in the vessel to oxidize materials in the second chamber, an induction fan, airflow inlet valves and an air intake proportioning valve connected to the vessel for producing separate variable flows of primary and secondary air into and through the first and second chambers, first sensors mounted on the vessel for sensing the temperatures in the first and second chambers and in the coolant, a second sensor mounted on the vessel for sensing the proportion of a predetermined gas in the discharge gases, and a control system responsive to the temperatures sensed in the first and second chambers and the coolant and to the proportion of the predetermined gas sensed in the discharge gases for controlling the induction fan and air intake proportioni
    Type: Grant
    Filed: December 9, 1992
    Date of Patent: October 11, 1994
    Inventors: Roger D. Eshleman, Paul H. Stevers