Patents by Inventor April J. Evans

April J. Evans 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).

  • Pyrethrum stabilization by inactivation of natural acetylenic impurities
    Patent number: 4798825
    Abstract: A composition and method for obtaining an improved stable composition of naturally occurring pyrethroid substances which naturally contain polyacetylenic substances includes inactivating the polyacetylenic substances by selective hydrogenation or removal of the polyacetylenic substances by extraction.
    Type: Grant
    Filed: September 21, 1987
    Date of Patent: January 17, 1989
    Assignee: Amoco Corporation
    Inventor: April J. Evans
  • Catalyst for demetallation and desulfurization of heavy hydrocarbons
    Patent number: 4707466
    Abstract: Disclosed is an improved catalyst suitable for use in an ebullated bed process for the hydrodemetallation, hydrodesulfurization, and hydrocracking of heavy hydrocarbon feedstocks containing asphaltenes, metals, and sulfur compounds. The disclosed catalyst comprises a relatively small amount of cobalt, i.e., 0.4 to 0.8 wt. % incorporated with a high macropore volume Group VIB metal containing catalyst.
    Type: Grant
    Filed: February 24, 1987
    Date of Patent: November 17, 1987
    Assignee: Amoco Corporation
    Inventors: William I. Beaton, Albert L. Hensley, April J. Evans
  • Process for demetallation and desulfurization of heavy hydrocarbons
    Patent number: 4657664
    Abstract: Disclosed is an improved multi-stage process for the hydroconversion of heavy hydrocarbon feedstocks containing asphaltenes, metals and sulfur compounds. The process is characterized by the use of a relatively inexpensive demetallation catalyst in a first reaction zone comprising a Group VIB and/or a Group VIII metal deposed on a high macropore volume inorganic support followed by the use of a desulfurization catalyst in a second reaction zone comprising a Group VIB and a Group VIII metal on a high macropore volume inorganic oxide support.
    Type: Grant
    Filed: December 20, 1985
    Date of Patent: April 14, 1987
    Assignee: Amoco Corporation
    Inventors: April J. Evans, Albert L. Hensley
  • Process for demetallation and desulfurization of heavy hydrocarbons
    Patent number: 4657665
    Abstract: Disclosed is an improved ebullated bed process for the hydroconversion of heavy hydrocarbon feedstocks containing asphaltenes, metals, and sulfur compounds. The disclosed process is characterized by the use of a catalyst comprising a relatively small amount of cobalt, i.e., 0.4 to 0.8 wt. % incorporated with a high macropore volume Group VIB metal containing catalyst.
    Type: Grant
    Filed: December 20, 1985
    Date of Patent: April 14, 1987
    Assignee: Amoco Corporation
    Inventors: William I. Beaton, Albert L. Hensley, April J. Evans
  • Selective conversion of cyano compounds to amides and carboxylic acids
    Patent number: 4629700
    Abstract: A process for producing aromatic compound having at least one cyano group and one amide group or carboxyl group which process comprises subjecting aromatic polynitrile compound containing no carboxyl groups in a simple medium to the action of one or more microorganisms which have a nitrilase system capable of selectively hydrolyzing one cyano group of the polynitrile.
    Type: Grant
    Filed: November 30, 1983
    Date of Patent: December 16, 1986
    Assignee: Standard Oil Company (Indiana)
    Inventors: William D. Prevatt, Cavit Akin, April J. Evans