Patents by Inventor Andrew C. Dahlgren

Andrew C. Dahlgren 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).

  • Publication number: 20230390685
    Abstract: A gas turbine air intake system uses a filter element having a seal member with radial projections and radial recesses. The seal member forms a seal with components on the tube sheet of the system and at the end opposite of the tube sheet. At the end opposite of the tube sheet, there can be an assembly cover, or alternatively, an additional filter cartridge.
    Type: Application
    Filed: June 29, 2023
    Publication date: December 7, 2023
    Applicant: Donaldson Company, Inc.
    Inventors: Jason A. TIFFANY, Brent L. ANDERSON, Richard P. DEJONG, Andrew C. DAHLGREN, Wim VAN GELDER, Olivier RONNEAU, Mathijs VERSTRAETE, Gert PROOST, Massimo MOVIA, Eli Payton ROSS, Michael R. CARLSON
  • Patent number: 11691101
    Abstract: A gas turbine air intake system uses a filter element having a seal member with radial projections and radial recesses. The seal member forms a seal with components on the tube sheet of the system and at the end opposite of the tube sheet. At the end opposite of the tube sheet, there can be an assembly cover, or alternatively, an additional filter cartridge.
    Type: Grant
    Filed: January 23, 2019
    Date of Patent: July 4, 2023
    Assignee: Donaldson Company, Inc.
    Inventors: Jason A. Tiffany, Brent L. Anderson, Richard P. DeJong, Andrew C. Dahlgren, Wim Van Gelder, Olivier Ronneau, Mathijs Verstraete, Gert Proost, Massimo Movia, Eli Payton Ross, Michael R. Carlson
  • Publication number: 20210046415
    Abstract: A gas turbine air intake system uses a filter element having a seal member with radial projections and radial recesses. The seal member forms a seal with components on the tube sheet of the system and at the end opposite of the tube sheet. At the end opposite of the tube sheet, there can be an assembly cover, or alternatively, an additional filter cartridge.
    Type: Application
    Filed: January 23, 2019
    Publication date: February 18, 2021
    Applicant: Donaldson Company, Inc.
    Inventors: Jason A. TIFFANY, Brent L. ANDERSON, Richard P. DEJONG, Andrew C. DAHLGREN, Wim VAN GELDER, Olivier RONNEAU, Mathijs VERSTRAETE, Gert PROOST, Massimo MOVIA, Eli Payton ROSS, Michael R. CARLSON
  • Patent number: 6726745
    Abstract: A filter assembly includes a shaped adsorbent article disposed in a housing. The shaped adsorbent article has one or more projections extending from a surface of the article toward the housing to provide for flow of fluid between the shaped adsorbent article and the housing. The filter assembly may optionally include a diffusion channel for additional filtering and/or one or more porous polymer films disposed over inlet or outlet openings in the housing to reduce or prevent particulate contamination. The filter assembly may be used in a device, such as a computer disk drive, to filter a fluid, such as air, within and/or entering or exiting the device.
    Type: Grant
    Filed: July 31, 2002
    Date of Patent: April 27, 2004
    Assignee: Donaldson Company, Inc.
    Inventors: Daniel L. Tuma, Andrew C. Dahlgren, Vijay Garikipati, Randy J. Logan
  • Publication number: 20020194989
    Abstract: A filter assembly includes a shaped adsorbent article disposed in a housing. The shaped adsorbent article has one or more projections extending from a surface of the article toward the housing to provide for flow of fluid between the shaped adsorbent article and the housing. The filter assembly may optionally includes a diffusion channel for additional filtering and/or one or more porous polymer films disposed over inlet or outlet openings in the housing to reduce or prevent particulate contamination. The filter assembly may be used in a device, such as a computer disk drive, to filter a fluid, such as air, within and/or entering or exiting the device.
    Type: Application
    Filed: July 31, 2002
    Publication date: December 26, 2002
    Applicant: Donaldson Company, Inc.
    Inventors: Daniel L. Tuma, Andrew C. Dahlgren, Vijay Garikipati, Randy J. Logan
  • Patent number: 6491741
    Abstract: A filter assembly includes a shaped adsorbent article disposed in a housing. The shaped adsorbent article has one or more projections extending from a surface of the article toward the housing to provide for flow of fluid between the shaped adsorbent article and the housing. The filter assembly may optionally include a diffusion channel for additional filtering and/or one or more porous polymer films disposed over inlet or outlet openings in the housing to reduce or prevent particulate contamination. The filter assembly may be used in a device, such as a computer disk drive, to filter a fluid, such as air, within and/or entering or exiting the device.
    Type: Grant
    Filed: December 11, 2000
    Date of Patent: December 10, 2002
    Assignee: Donaldson Company, Inc.
    Inventors: Daniel L. Tuma, Andrew C. Dahlgren, Vijay Garikipati, Randy J. Logan
  • Publication number: 20010000381
    Abstract: A filter assembly includes a shaped adsorbent article disposed in a housing. The shaped adsorbent article has one or more projections extending from a surface of the article toward the housing to provide for flow of fluid between the shaped adsorbent article and the housing. The filter assembly may optionally includes a diffusion channel for additional filtering and/or one or more porous polymer films disposed over inlet or outlet openings in the housing to reduce or prevent particulate contamination. The filter assembly may be used in a device, such as a computer disk drive, to filter a fluid, such as air, within and/or entering or exiting the device.
    Type: Application
    Filed: December 11, 2000
    Publication date: April 26, 2001
    Applicant: Donaldson Company, Inc.
    Inventors: Daniel L. Tuma, Andrew C. Dahlgren, Vijay Garikipati, Randy J. Logan
  • Patent number: 6168651
    Abstract: A filter assembly includes a shaped adsorbent article disposed in a housing. The shaped adsorbent article has one or more projections extending from a surface of the article toward the housing to provide for flow of fluid between the shaped adsorbent article and the housing. The filter assembly may optionally include a diffiusion channel for additional filtering and/or one or more porous polymer films disposed over inlet or outlet openings in the housing to reduce or prevent particulate contamination. The filter assembly may be used in a device, such as a computer disk drive, to filter a fluid, such as air, within and/or entering or exiting the device.
    Type: Grant
    Filed: July 14, 1999
    Date of Patent: January 2, 2001
    Assignee: Donaldson Company, Inc.
    Inventors: Daniel L. Tuma, Andrew C. Dahlgren, Vijay Garikipati, Randy J. Logan
  • Patent number: 6146446
    Abstract: A filter assembly includes a shaped adsorbent article disposed in a housing. The shaped adsorbent article has one or more projections extending from a surface of the article toward the housing to provide for flow of fluid between the shaped adsorbent article and the housing. The filter assembly may optionally include a diffusion channel for additional filtering and/or one or more porous polymer films disposed over inlet or outlet openings in the housing to reduce or prevent particulate contamination. The filter assembly may be used in a device, such as a computer disk drive, to filter a fluid, such as air, within and/or entering or exiting the device.
    Type: Grant
    Filed: October 8, 1998
    Date of Patent: November 14, 2000
    Assignee: Donaldson Company, Inc.
    Inventors: Daniel L. Tuma, Andrew C. Dahlgren, Vijay Garikipati
  • Patent number: 5997614
    Abstract: A filter has a channel layer film defining a channel, a boundary layer mounted to at least a portion of the channel layer film and forming a non-adhesive boundary for the channel, and filter media disposed in fluid communication with the channel. The boundary layer typically includes a non-porous or semipermeable film. The filter is configured and arranged to provide for flow of at least a portion of a fluid along the channel and into the filter media. This filter can be used in a device as a filter over a vent in a housing of the device.
    Type: Grant
    Filed: July 13, 1998
    Date of Patent: December 7, 1999
    Assignee: Donaldson Company, Inc.
    Inventors: Daniel L. Tuma, Randy J. Logan, Andrew C. Dahlgren