Patents by Inventor Douglas G. Crofoot

Douglas G. Crofoot 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).

  • Bag house filter with fine fiber and spun bonded media
    Patent number: 7318852
    Abstract: Disclosed are improved polymer materials. Also disclosed are fine fiber materials that can be made from the improved polymeric materials in the form of microfiber and nanofiber structures. The microfiber and nanofiber structures can be used in a variety of useful applications including the formation of filter materials.
    Type: Grant
    Filed: April 6, 2006
    Date of Patent: January 15, 2008
    Assignee: Donaldson Company, Inc.
    Inventors: Hoo Y. Chung, John R. B. Hall, Mark A. Gogins, Douglas G. Crofoot, Thomas M. Weik
  • Polymer, polymer microfiber, polymer nanofiber and applications including filter structures
    Patent number: 7318853
    Abstract: Disclosed are improved polymer materials. Also disclosed are fine fiber materials that can be made from the improved polymeric materials in the form of microfiber and nanofiber structures. The microfiber and nanofiber structures can be used in a variety of useful applications including the formation of filter materials.
    Type: Grant
    Filed: November 2, 2006
    Date of Patent: January 15, 2008
    Assignee: Donaldson Company, Inc.
    Inventors: Hoo Y. Chung, John R. B. Hall, Mark A. Gogins, Douglas G. Crofoot, Thomas M. Weik
  • Air filter with fine fiber and spun bonded media
    Patent number: 7316723
    Abstract: Disclosed are improved polymer materials. Also disclosed are fine fiber materials that can be made from the improved polymeric materials in the form of microfiber and nanofiber structures. The microfiber and nanofiber structures can be used in a variety of useful applications including the formation of filter materials.
    Type: Grant
    Filed: April 6, 2006
    Date of Patent: January 8, 2008
    Assignee: Donaldson Company, Inc.
    Inventors: Hoo Y. Chung, John R. B. Hall, Mark A. Gogins, Douglas G. Crofoot, Thomas M. Weik
  • Polymer, polymer microfiber, polymer nanofiber and applications including filter structures
    Patent number: 7270693
    Abstract: Disclosed are improved polymer materials. Also disclosed are fine fiber materials that can be made from the improved polymeric materials in the form of microfiber and nanofiber structures. The microfiber and nanofiber structures can be used in a variety of useful applications including the formation of filter materials.
    Type: Grant
    Filed: January 16, 2006
    Date of Patent: September 18, 2007
    Assignee: Donaldson Company, Inc.
    Inventors: Hoo Y. Chung, John R.B. Hall, Mark A. Gogins, Douglas G. Crofoot, Thomas M. Weik
  • Polymer, polymer microfiber, polymer nanofiber and applications including filter structures
    Patent number: 7179317
    Abstract: Disclosed are improved polymer materials. Also disclosed are fine fiber materials that can be made from the improved polymeric materials in the form of microfiber and nanofiber structures. The microfiber and nanofiber structures can be used in a variety of useful applications including the formation of filter materials.
    Type: Grant
    Filed: July 19, 2004
    Date of Patent: February 20, 2007
    Assignee: Donaldson Company, Inc.
    Inventors: Hoo Y. Chung, John R. B. Hall, Mark A. Gogins, Douglas G. Crofoot, Thomas M. Weik
  • Polymer, polymer microfiber, polymer nanofiber and applications including filter structures
    Patent number: 7090715
    Abstract: Disclosed are improved polymer materials. Also disclosed are fine fiber materials that can be made from the improved polymeric materials in the form of microfiber and nanofiber structures. The microfiber and nanofiber structures can be used in a variety of useful applications including the formation of filter materials.
    Type: Grant
    Filed: September 30, 2003
    Date of Patent: August 15, 2006
    Assignee: Donaldson Company, Inc.
    Inventors: Hoo Y. Chung, John R. B. Hall, Mark A. Gogins, Douglas G. Crofoot, Thomas M. Weik
  • Polymer, polymer microfiber, polymer nanofiber and applications including filter structures
    Patent number: 7070640
    Abstract: Disclosed are improved polymer materials. Also disclosed are fine fiber materials that can be made from the improved polymeric materials in the form of microfiber and nanofiber structures. The microfiber and nanofiber structures can be used in a variety of useful applications including the formation of filter materials.
    Type: Grant
    Filed: January 14, 2004
    Date of Patent: July 4, 2006
    Assignee: Donaldson Company, Inc.
    Inventors: Hoo Y. Chung, John R. B. Hall, Mark A. Gogins, Douglas G. Crofoot, Thomas M. Weik
  • Process if making fine fiber material
    Patent number: 6955775
    Abstract: Improved polymer materials and fine fiber materials can be made from the improved polymeric materials in the form of microfiber and nanofiber structures. The microfiber and nanofiber structures can be used in a variety of useful applications including the formation of filter materials.
    Type: Grant
    Filed: September 30, 2003
    Date of Patent: October 18, 2005
    Assignee: Donaldson Company, Inc.
    Inventors: Hoo Y. Chung, John R. B. Hall, Mark A. Gogins, Douglas G. Crofoot, Thomas M. Weik
  • Polymer, polymer microfiber, polymer nanofiber and applications including filter structures
    Patent number: 6924028
    Abstract: Disclosed are improved polymer materials. Also disclosed are fine fiber materials that can be made from the improved polymeric materials in the form of microfiber and nanofiber structures. The microfiber and nanofiber structures can be used in a variety of useful applications including the formation of filter materials.
    Type: Grant
    Filed: September 30, 2003
    Date of Patent: August 2, 2005
    Assignee: Donaldson Company, Inc.
    Inventors: Hoo Y. Chung, John R. B. Hall, Mark A. Gogins, Douglas G. Crofoot, Thomas M. Weik
  • Polymer, polymer microfiber, polymer nanofiber and applications including filter structures
    Publication number: 20040187454
    Abstract: Disclosed are improved polymer materials. Also disclosed are fine fiber materials that can be made from the improved polymeric materials in the form of microfiber and nanofiber structures. The microfiber and nanofiber structures can be used in a variety of useful applications including the formation of filter materials.
    Type: Application
    Filed: January 14, 2004
    Publication date: September 30, 2004
    Applicant: Donaldson Company, Inc.
    Inventors: Hoo Y. Chung, John R.B. Hall, Mark A. Gogins, Douglas G. Crofoot, Thomas M. Weik
  • Polymer, polymer microfiber, polymer nanofiber and applications including filter structures
    Publication number: 20040123572
    Abstract: Disclosed are improved polymer materials. Also disclosed are fine fiber materials that can be made from the improved polymeric materials in the form of microfiber and nanofiber structures. The microfiber and nanofiber structures can be used in a variety of useful applications including the formation of filter materials.
    Type: Application
    Filed: September 30, 2003
    Publication date: July 1, 2004
    Applicant: Donaldson Company, Inc.
    Inventors: Hoo Y. Chung, John R.B. Hall, Mark A. Gogins, Douglas G. Crofoot, Thomas M. Weik
  • Air permeable garment and fabric with integral aerosol filtration
    Publication number: 20040116025
    Abstract: A multilayer fabric for protection from aerosol and gas phase agents comprising a bilayer structure comprising an unfilled Fine fiber layer substantially free of materials within the pores of the Fine fiber layer secured to an outer shell, the Fine fiber layer acting as an aerosol filter, and an optional interior fabric layer having a reactive layer for the removal of gas phase agents.
    Type: Application
    Filed: December 17, 2002
    Publication date: June 17, 2004
    Inventors: Mark A. Gogins, Hoo Young Chung, Douglas G. Crofoot, Ismael Ferrer, Dmitry Luzhansky
  • Filter structure with two or more layers of fine fiber having extended useful service life
    Patent number: 6746517
    Abstract: The use of fine fiber or fiber having a fiber diameter of about 0.0001 to 0.5 microns has become an important design tool for filter media. Common filter media have been prepared with a layer of fine fiber on typically formed the upstream or intake side of the media structure. The fine fiber increases the efficiency of filtration by trapping small particles which increases the overall particulate filtration efficiency of the structure. Improved fine fiber structures have been developed in which a controlled amount of fine fiber is placed on both sides of the media to result in an improvement in filter efficiency but a substantial improvement in lifetime.
    Type: Grant
    Filed: May 31, 2001
    Date of Patent: June 8, 2004
    Assignee: Donaldson Company, Inc.
    Inventors: James D. Benson, Douglas G. Crofoot, Mark A. Gogins, Thomas M. Weik
  • Polymer, polymer microfiber, polymer nanofiber and applications including filter structures
    Patent number: 6743273
    Abstract: Disclosed are improved polymer materials. Also disclosed are fine fiber materials that can be made from the improved polymeric materials in the form of microfiber and nanofiber structures. The microfiber and nanofiber structures can be used in a variety of useful applications including the formation of filter materials.
    Type: Grant
    Filed: May 31, 2001
    Date of Patent: June 1, 2004
    Assignee: Donaldson Company, Inc.
    Inventors: Hoo Y. Chung, John R. B. Hall, Mark A. Gogins, Douglas G. Crofoot, Thomas M. Weik
  • Polymer, polymer microfiber, polymer nanofiber and applications including filter structures
    Publication number: 20040060269
    Abstract: Disclosed are improved polymer materials. Also disclosed are fine fiber materials that can be made from the improved polymeric materials in the form of microfiber and nanofiber structures. The microfiber and nanofiber structures can be used in a variety of useful applications including the formation of filter materials.
    Type: Application
    Filed: September 30, 2003
    Publication date: April 1, 2004
    Applicant: Donaldson Company, Inc.
    Inventors: Hoo Y. Chung, John R.B. Hall, Mark A. Gogins, Douglas G. Crofoot, Thomas M. Weik
  • Polymer, polymer microfiber, polymer nanofiber and applications including filter structures
    Publication number: 20040060268
    Abstract: Disclosed are improved polymer materials. Also disclosed are fine fiber materials that can be made from the improved polymeric materials in the form of microfiber and nanofiber structures. The microfiber and nanofiber structures can be used in a variety of useful applications including the formation of filter materials.
    Type: Application
    Filed: September 30, 2003
    Publication date: April 1, 2004
    Applicant: Donaldson Company, Inc.
    Inventors: Hoo Y. Chung, John R. B. Hall, Mark A. Gogins, Douglas G. Crofoot, Thomas M. Weik
  • Polymer, polymer microfiber, polymer nanofiber and applications including filter structures
    Publication number: 20030106294
    Abstract: Disclosed are improved polymer materials. Also disclosed are fine fiber materials that can be made from the improved polymeric materials in the form of microfiber and nanofiber structures. The microfiber and nanofiber structures can be used in a variety of useful applications including the formation of filter materials.
    Type: Application
    Filed: May 31, 2001
    Publication date: June 12, 2003
    Inventors: Hoo Y. Chung, John R.B. Hall, Mark A. Gogins, Douglas G. Crofoot, Thomas M. Weik
  • Filter structure with two or more layers of fine fiber having extended useful service life
    Publication number: 20020046656
    Abstract: The use of fine fiber or fiber having a fiber diameter of about 0.0001 to 0.5 microns has become an important design tool for filter media. Common filter media have been prepared with a layer of fine fiber on typically formed the upstream or intake side of the media structure. The fine fiber increases the efficiency of filtration by trapping small particles which increases the overall particulate filtration efficiency of the structure. Improved fine fiber structures have been developed in which a controlled amount of fine fiber is placed on both sides of the media to result in an improvement in filter efficiency but a substantial improvement in lifetime.
    Type: Application
    Filed: May 31, 2001
    Publication date: April 25, 2002
    Inventors: James D. Benson, Douglas G. Crofoot, Mark A. Gogins, Thomas M. Weik
  • Self-spaced pleated filter
    Patent number: 5066400
    Abstract: A self-spaced pleated filter element is provided having panel elements including repeating cycles of corrugations separated by spans of uncorrugated filter material.
    Type: Grant
    Filed: October 9, 1990
    Date of Patent: November 19, 1991
    Assignee: Donaldson Company, Inc.
    Inventors: Gary J. Rocklitz, Douglas G. Crofoot, Richard L. Zelinka