Patents by Inventor David K. Stevens

David K. Stevens 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: 8084013
    Abstract: A method and apparatus for degasification of Claus-derived sulfur by the use of gas-liquid eductor using the liquid sulfur as the ejector motive force and ambient sweep air as the active degassing agent combined with a static mixer and packed bed for promoting the intimate contact of the air and the sulfur.
    Type: Grant
    Filed: July 21, 2010
    Date of Patent: December 27, 2011
    Assignee: KPS Technology & Engineering LLC
    Inventors: Mark R. Tonjes, David K. Stevens, Lindsay D. Dreitzler, Alan D. Mosher
  • Publication number: 20110171115
    Abstract: An improved method and consolidated apparatus for recovery of sulfur from acid gases using the modified-Claus process and Claus tail gas treating process of the hydrogenation/amine absorption type as classically practiced in the oil & gas industry. By implementing innovations to the acid gas processing strategy a wider range of feedstocks can be processed and improved performance is seen when processing conventional feedstocks; in addition, through consolidation and integration of the typical practice an improved apparatus is realized.
    Type: Application
    Filed: July 21, 2010
    Publication date: July 14, 2011
    Applicant: KPS TECHNOLOGY & ENGINEERING LLC
    Inventors: David K. Stevens, Mark R. Tonjes, Lindsay D. Dreitzler, Alan D. Mosher
  • Patent number: 7931889
    Abstract: A method for producing hydrogen from a light hydrocarbon gas with the hydrocarbon gas being converted to particulate carbon and hydrogen and thereafter quenched with liquid sulfur with the purified hydrogen being recovered as a product.
    Type: Grant
    Filed: April 30, 2009
    Date of Patent: April 26, 2011
    Assignee: Black & Veatch Corporation
    Inventors: Peter D. Clark, Justin A. Lamar, David K. Stevens
  • Publication number: 20110020212
    Abstract: A method and apparatus for degasification of Claus-derived sulfur by the use of gas-liquid eductor using the liquid sulfur as the ejector motive force and ambient sweep air as the active degassing agent combined with a static mixer and packed bed for promoting the intimate contact of the air and the sulfur.
    Type: Application
    Filed: July 21, 2010
    Publication date: January 27, 2011
    Applicant: KPS TECHNOLOGY & ENGINEERING LLC
    Inventors: Mark R. Tonjes, David K. Stevens, Lindsay D. Dreitzler, Alan D. Mosher
  • Publication number: 20100123099
    Abstract: A method for producing hydrogen from a light hydrocarbon gas with the hydrocarbon gas being converted to particulate carbon and hydrogen and thereafter quenched with liquid sulfur with the purified hydrogen being recovered as a product.
    Type: Application
    Filed: April 30, 2009
    Publication date: May 20, 2010
    Inventors: Peter D. Clark, Justin A. Lamar, David K. Stevens
  • Publication number: 20100108315
    Abstract: A process to reduce the hydrogen sulfide content of a hydrogen sulfide-containing subterranean formation and of products recovered from the subterranean formation by injecting sulfur dioxide into the subterranean formation.
    Type: Application
    Filed: April 30, 2009
    Publication date: May 6, 2010
    Inventors: David K. Stevens, Peter D. Clark, Justin A. Lamar
  • Patent number: 7282193
    Abstract: A method for producing sulfur and energy from an acid gas stream containing hydrogen sulfide by partially combusting the acid gas stream to produce a combustion product gas, mixing a sulfur dioxide stream with the combustion product gas, separating sulfur from the mixture, combusting sulfur to produce sulfur dioxide and heat energy and passing at least a portion of the sulfur dioxide to the combustion product gas.
    Type: Grant
    Filed: June 20, 2005
    Date of Patent: October 16, 2007
    Assignee: Black & Veatch Corporation
    Inventors: Peter D. Clark, David K. Stevens
  • Patent number: 6884282
    Abstract: A system and a method for increasing the selectivity of H2S absorption in an aqueous amine treating processes for streams containing high CO2:H2S ratio mixtures in an absorption column by maintaining the temperature in the absorption column by withdrawing, cooling and returning cooled aqueous amine to the column at at least one location intermediate the sour gas inlet to the column and the lean gas outlet from the column.
    Type: Grant
    Filed: May 13, 2003
    Date of Patent: April 26, 2005
    Inventors: David K. Stevens, Kevin M. Robertson, Mark R. Tonjes, Lindsay Wedel Dreitzler
  • Publication number: 20030213363
    Abstract: A system and a method for increasing the selectivity of H2S absorption in an aqueous amine treating processes for streams containing high CO2:H2S ratio mixtures in an absorption column by maintaining the temperature in the absorption column by withdrawing, cooling and returning cooled aqueous amine to the column at at least one location intermediate the sour gas inlet to the column and the lean gas outlet from the column.
    Type: Application
    Filed: May 13, 2003
    Publication date: November 20, 2003
    Inventors: David K. Stevens, Kevin M. Robertson, Mark R. Tonjes, Lindsay Wedel Dreitzler
  • Patent number: 5904910
    Abstract: A method for producing hydrogen and sulfur from a first gaseous mixture containing hydrogen sulfide and ammonia by separating ammonia from the first gaseous mixture to produce a second gaseous mixture containing hydrogen sulfide; combusting a portion of the hydrogen sulfide in the second gaseous mixture to produce a third gaseous mixture containing hydrogen sulfide and sulfur dioxide; heating the ammonia to a temperature of at least 1800.degree. F. to produce a fourth gaseous mixture containing nitrogen and hydrogen; and, combining the third gaseous mixture and the fourth gaseous mixture and passing the combined gaseous mixture to a sulfur recovery process wherein the hydrogen sulfide and sulfur dioxide are recovered as sulfur.The ammonia may be partially oxidized by the use of substoichiometric amounts of oxygen or thermally dissociated.
    Type: Grant
    Filed: November 7, 1997
    Date of Patent: May 18, 1999
    Assignee: Black & Veatch Pritchard, Inc.
    Inventors: David K. Stevens, James S. McCormick
  • Patent number: 4196312
    Abstract: An improved drive unit for accumulation live roller conveyors utilizing frictional engagement of a radial surface provided on drive wheels against the rollers is described. The drive unit includes multiple drive wheels each functioning to rotate two rollers simultaneously and each provided with a radial frictional drive surface which engages the rollers. The drive wheels are rotatably mounted in spaced and aligned relation on a support bar and the support bar is arcuately pivotable on a frame supporting the rollers towards the roller surfaces in order to selectively bring the radial drive wheel surfaces into contact with the roller surfaces.
    Type: Grant
    Filed: April 3, 1978
    Date of Patent: April 1, 1980
    Assignee: David A. DeGood
    Inventors: David A. DeGood, David K. Stevens
  • Patent number: 4164998
    Abstract: A live roller conveyor is described of the type which can accumulate conveyed articles on a pass line. Article accumulation is usually automatically achieved on the pass line by disconnecting pre-selected rollers from a power source. The power source for a driven roller includes a drive wheel moveably mounted on the frame supporting the rollers and having a radial drive surface which is rotatably mounted on a shaft having its longitudinal axis spaced from the longitudinal axis of the roller such that the drive surface can be moved into frictional engagement with an end surface of a roller to rotate the roller. The drive surface on the drive wheel is preferably in the form of a tensioned belt which extends around a portion of the circumference of the drive wheel and around a spaced apart rotatable drive shaft for rotation of the drive wheel.
    Type: Grant
    Filed: February 16, 1977
    Date of Patent: August 21, 1979
    Assignee: David A. DeGood
    Inventors: David A. DeGood, David K. Stevens