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Publication number: 20100212272Abstract: Filter media which may be used in ASHRAE applications are described. The media include a fiber web and has desirable performance characteristics.Type: ApplicationFiled: February 24, 2009Publication date: August 26, 2010Applicant: Hollingsworth & Vose CompanyInventors: David F. Sealey, Marianne Lane
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Patent number: 8545587Abstract: Multi-phase filter media, as well as related articles, components, filter elements, and methods, are disclosed.Type: GrantFiled: November 27, 2011Date of Patent: October 1, 2013Assignee: Hollingsworth & Vose CompanyInventors: Douglas M. Guimond, Mark Snyder
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Patent number: 8357220Abstract: Multi-phase filter media, as well as related articles, components, filter elements, and methods, are disclosed.Type: GrantFiled: June 19, 2009Date of Patent: January 22, 2013Assignee: Hollingsworth & Vose CompanyInventors: Douglas M. Guimond, Mark Snyder
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Patent number: 8608817Abstract: Filter media, as well as related assemblies, systems and methods. Filter media may contain one or more layers formed of a meltblown material.Type: GrantFiled: November 7, 2008Date of Patent: December 17, 2013Assignee: Hollingsworth & Vose CompanyInventors: John A. Wertz, David Thomas Healey, William S. Freeman, John L. Manns, Mark Rowlands
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Patent number: 8083828Abstract: The fiber webs described herein may be incorporated into filter media and filter elements. The webs may exhibit a high permeability and stiffness, at a low thickness. The stiffness can be sufficient for the webs to be pleated to include sharp, well-defined peaks which can be maintained in a stable configuration during use.Type: GrantFiled: June 19, 2009Date of Patent: December 27, 2011Assignee: Hollingsworth & Vose CompanyInventors: Bruce Smith, Sudhakar Jaganathan
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Patent number: 6514325Abstract: An electret filter media includes an additive or mixtures thereof that enhance the charge stability of the media. The filter media achieves acceptable alpha values for a range of filtration challenges without significant decay in alpha values over time. Preferred charge additives include fatty acid amides and mixtures thereof.Type: GrantFiled: March 12, 2001Date of Patent: February 4, 2003Assignee: Hollingsworth & Vose CompanyInventors: Stephen T. Cox, David T. Healey
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Patent number: 8778046Abstract: The fiber webs described herein may be incorporated into filter media and filter elements. The fiber webs may exhibit a high dust holding capacity. The fiber webs may also exhibit a low thickness. The fiber webs may be sufficiently flexible and/or deformable so that they may be processed to include a series of waves (also known as flutes) that extend along the cross-machine direction.Type: GrantFiled: August 16, 2013Date of Patent: July 15, 2014Assignee: Hollingsworth & Vose CompanyInventors: James M. Witsch, Douglas M. Guimond
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Patent number: 8778047Abstract: The fiber webs described herein may be incorporated into filter media and filter elements. The fiber webs may exhibit a high dust holding capacity. The fiber webs may also exhibit a low thickness. The fiber webs may be sufficiently flexible and/or deformable so that they may be processed to include a series of waves (also known as flutes) that extend along the cross-machine direction.Type: GrantFiled: August 16, 2013Date of Patent: July 15, 2014Assignee: Hollingsworth & Vose CompanyInventors: James M. Witsch, Douglas M. Guimond
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Patent number: 5645627Abstract: An electret filter media includes an additive or mixtures thereof that enhance the charge stability of the media. The filter media achieves acceptable alpha values for a range of filtration challenges without significant decay in alpha values over time. Preferred charge additives include fatty acid amides, oleophobic fluorochemical surfactants, and mixtures thereof.Type: GrantFiled: February 28, 1995Date of Patent: July 8, 1997Assignee: Hollingsworth & Vose CompanyInventors: Norman Lifshutz, Richard E. Gahan, Graham C. Stevens
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Patent number: 4119543Abstract: A filter medium particularly adapted for use in an oil filter for an internal combustion engine having a water-laid web of fibers, at least 70% of which are cellulose, impregnated with resin in a pattern at its wire side to a depth of 15 to 45% of its total thickness, the pattern having zones free from resin amounting to 35 to 60% of the total area of the wire side, each zone having at least one dimension no greater than 4 mm.Type: GrantFiled: July 8, 1977Date of Patent: October 10, 1978Assignee: Hollingsworth & Vose CompanyInventors: Grover C. Lawson, James C. Wilson
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Patent number: 8790492Abstract: The fiber webs described herein may be incorporated into filter media and filter elements. The fiber webs may exhibit a high dust holding capacity. The fiber webs may also exhibit a low thickness. The fiber webs may be sufficiently flexible and/or deformable so that they may be processed to include a series of waves (also known as flutes) that extend along the cross-machine direction.Type: GrantFiled: August 16, 2013Date of Patent: July 29, 2014Assignee: Hollingsworth & Vose CompanyInventors: James M. Witsch, Douglas M. Guimond
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Patent number: 8663358Abstract: Filter media are provided having improved conductivity to enhance filtration efficiency and/or dissipate static charge, and methods for making the same. In one exemplary embodiment, the filter media can include a filtration substrate, and at least one conductive coating disposed on at least a portion of the filtration substrate. In use, the conductive coating is coupled to an energy source and it is effective to emit ions when energy is delivered thereto to increase the efficiency of the filtration substrate and/or to dissipate or eliminate static charge generated during filtration.Type: GrantFiled: May 9, 2011Date of Patent: March 4, 2014Assignee: Hollingsworth & Vose CompanyInventors: Wai M. Choi, Karin N. Soper
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Patent number: 7964012Abstract: Filter media are provided having improved conductivity to enhance filtration efficiency and/or dissipate static charge, and methods for making the same. In one exemplary embodiment, the filter media can include a filtration substrate, and at least one conductive coating disposed on at least a portion of the filtration substrate. In use, the conductive coating is coupled to an energy source and it is effective to emit ions when energy is delivered thereto to increase the efficiency of the filtration substrate and/or to dissipate or eliminate static charge generated during filtration.Type: GrantFiled: August 2, 2006Date of Patent: June 21, 2011Assignee: Hollingsworth & Vose CompanyInventors: Wai M. Choi, Karin N. Soper
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Patent number: 8679218Abstract: Filter media are described. The filter media may include multiple layers. In some embodiments, the filter media include a nanofiber layer adhered to another layer. In some embodiments, the layer to which the nanofiber layer is adhered is formed of multiple fiber types (e.g., fibers that give rise to structures having different air permeabilities and/or pressure drops). In some embodiments, the nanofiber layer is adhered to a single-phase or a multi-phase layer. In some embodiments, the nanofiber layer is manufactured from a meltblown process. The filter media may be designed to have advantageous properties including, in some cases, a high dust particle capture efficiency and/or a high dust holding capacity.Type: GrantFiled: April 27, 2010Date of Patent: March 25, 2014Assignee: Hollingsworth & Vose CompanyInventors: John A. Wertz, Douglas M. Guimond
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Patent number: 8114197Abstract: Articles such as filter media, which include dendrimers and/or other components, are provided. The filter media may further include a water repellant (e.g., a fluorinated species) to impart desirable properties to the media such as high water repellency. The filter media may also have a high efficiency as a function of pressure drop (i.e., high gamma values). In some embodiments, the filter media includes a fiber web which may be formed of various components such as glass fibers. The fiber web can also include additional components such as synthetic fibers, binder components, as well as other additives. The media may be incorporated into a variety of filter element products.Type: GrantFiled: January 22, 2010Date of Patent: February 14, 2012Assignee: Hollingsworth & Vose CompanyInventors: David F. Sealey, Stuart Williams
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Patent number: 8956437Abstract: Articles such as filter media, which include dendrimers and/or other components, are provided. The filter media may further include a water repellant (e.g., a fluorinated species) to impart desirable properties to the media such as high water repellency. The filter media may also have a high efficiency as a function of pressure drop (i.e., high gamma values). In some embodiments, the filter media includes a fiber web which may be formed of various components such as glass fibers. The fiber web can also include additional components such as synthetic fibers, binder components, as well as other additives. The media may be incorporated into a variety of filter element products.Type: GrantFiled: December 29, 2011Date of Patent: February 17, 2015Assignee: Hollingsworth & Vose CompanyInventors: David F. Sealey, Stuart Williams