Patents by Inventor Douglas A. Wersal

Douglas A. Wersal 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).

  • Air filter cartridge
    Patent number: 9446340
    Abstract: Filters capable of dissipating static charges. One example includes a filter media pack comprising fluted media secured to facing media; the fluted media having cellulose fibers; and the fluted media including an amount of carbon black sufficient to impart a static charge dissipative property thereto. One example includes an air filter cartridge having a filter media pack comprising fluted media secured to facing media; the fluted media comprising cellulose fibers; the fluted media having at least one side coated with a static charge dissipative amount of a metallic coating. These filters are useable in, for example, dust collectors.
    Type: Grant
    Filed: November 6, 2009
    Date of Patent: September 20, 2016
    Assignee: Donaldson Company, Inc.
    Inventors: Brian D. Babcock, Heather M. Tate, Mark D. Belcher, Brain Zauner, Kyle W. Undesser, Douglas A. Wersal
  • FILTRATION MEDIA, MEDIA PACK ASSEMBLIES, AND METHODS
    Publication number: 20160074789
    Abstract: The technology disclosed herein relates to a filter media having a fiber matrix and a binder distributed throughout the fiber matrix. Conductive particles are impregnated in the binder matrix and a flame retardant distributed throughout the fiber matrix and the binder matrix. The filter media can be incorporated into various types of media pack assemblies for air filtration including coiled media, pleated media, and stacked filter media. A method is also disclosed where conductive particles are distributed in a binder and a fiber matrix is impregnated with the binder. A solution containing at least 5% flame retardant solids is formed and the fiber matrix is saturated in the solution. The saturated, impregnated fiber matrix is dried and cured.
    Type: Application
    Filed: September 10, 2015
    Publication date: March 17, 2016
    Inventors: Joseph Israel, Douglas A. Wersal, Andrew J. Untz
  • AIR FILTER CARTRIDGE
    Publication number: 20110252758
    Abstract: Filters capable of dissipating static charges. One example includes a filter media pack comprising fluted media secured to facing media; the fluted media having cellulose fibers; and the fluted media including an amount of carbon black sufficient to impart a static charge dissipative property thereto. One example includes an air filter cartridge having a filter media pack comprising fluted media secured to facing media; the fluted media comprising cellulose fibers; the fluted media having at least one side coated with a static charge dissipative amount of a metallic coating. These filters are useable in, for example, dust collectors.
    Type: Application
    Filed: November 6, 2009
    Publication date: October 20, 2011
    Applicant: Donaldson Company Inc.
    Inventors: Brian D. Babcock, Heather M. Tate, Mark D. Belcher, Brian Zauner, Kyle W. Undesser, Douglas A. Wersal