Search Patents
  • Pre-coalescing multi-layered filter media
    Patent number: 10279291
    Abstract: Fiber webs that may be used as filter media are provided. In some embodiments, the filter media may include multiple layers. Each layer may be designed to have separate functions in the filter media. For example, a first layer may be provided for improving dust holding capacity, a second layer for improving efficiency, and a third layer for providing support and strength to the media. By designing the layers to have separate functions, each layer may be optimized to enhance its function without negatively impacting the performance of another layer of the media.
    Type: Grant
    Filed: August 31, 2015
    Date of Patent: May 7, 2019
    Assignee: Hollingsworth & Vose Company
    Inventors: Máté Nagy, Siqiang Zhu
  • FILTER MEDIA COMPRISING FLUORINATED AND NON-FLUORINATED WATER REPELLENT ADDITIVES
    Publication number: 20220161171
    Abstract: Filter media comprising fluorinated water-repellent additives and/or water-repellent additives having minimal or no fluorine atoms are generally provided. Filter media disclosed herein may include fluorinated water-repellent additives but not water-repellent additives having minimal or no fluorine atoms, water-repellent additives having minimal or no fluorine atoms but not fluorinated water-repellent additives, or both fluorinated water-repellent additives and water-repellent additives having minimal or no fluorine atoms.
    Type: Application
    Filed: November 23, 2021
    Publication date: May 26, 2022
    Applicant: Hollingsworth & Vose Company
    Inventors: Dimitry Papkov, Phillip P. Carpenter, Felix Ahrens
  • FILTER MEDIA INCLUDING A WAVED FILTRATION LAYER
    Publication number: 20170080368
    Abstract: Filter media including a waved filtration layer are described herein. The filtration layer may be held in a waved configuration by a support layer. In some cases, the filtration layer may have a combination of characteristics (e.g., mean flow pore size, basis weight, amongst others) that can lead to enhanced filtration performance (e.g., reduced air permeability decrease), in particular, in high humidity environments. The filter media may be used to form a variety of filter elements for use in various applications.
    Type: Application
    Filed: September 18, 2015
    Publication date: March 23, 2017
    Applicant: Hollingsworth & Vose Company
    Inventors: Bruce Smith, David T. Healey, Ingrid Staisch
  • Multi-region battery separators
    Patent number: 9577236
    Abstract: Disclosed is a battery separator, comprising two fiber regions comprising glass fibers, and a middle fiber region disposed between them comprising larger average diameter fibers and specified amounts of silica, or fine fibers, or both; and processes for making the separator. Also disclosed is a battery separator, comprising a fiber region and either one or two silica-containing region(s) adjacent thereto, each of the regions containing a specified amount of silica; and processes for making the separator. Such separators are useful, e.g., in lead-acid batteries.
    Type: Grant
    Filed: February 9, 2016
    Date of Patent: February 21, 2017
    Assignee: Hollingsworth & Vose Company
    Inventors: Akshay Ashirgade, Zhiping Jiang
  • UNDULATED FILTER MEDIA
    Publication number: 20220193588
    Abstract: Filter media comprising non-woven fiber webs and having one or more advantageous structural properties are generally described. In some embodiments, a filter media and/or non-woven fiber web described herein has one or more properties that are both beneficial and easily obtainable by undulating the non-woven fiber web, such as by performing a creping procedure. This property may be characteristic of the procedure employed to form the undulations (e.g., creping and/or microcreping), or may be attainable via one or more methods of undulation.
    Type: Application
    Filed: December 18, 2020
    Publication date: June 23, 2022
    Applicant: Hollingsworth & Vose Company
    Inventors: Sudheer Jinka, Praveen Kumar Yegya Raman, Howard Yu, Xinquan Cheng, Sudhakar Jaganathan
  • Multi-region battery separators
    Patent number: 9728756
    Abstract: Disclosed is a battery separator, comprising two fiber regions comprising glass fibers, and a middle fiber region disposed between them comprising larger average diameter fibers and specified amounts of silica, or fine fibers, or both; and processes for making the separator. Also disclosed is a battery separator, comprising a fiber region and either one or two silica-containing region(s) adjacent thereto, each of the regions containing a specified amount of silica; and processes for making the separator. Such separators are useful, e.g., in lead-acid batteries.
    Type: Grant
    Filed: February 8, 2017
    Date of Patent: August 8, 2017
    Assignee: Hollingsworth & Vose Company
    Inventors: Akshay Ashirgade, Zhiping Jiang
  • Multi-region battery separators
    Patent number: 9627668
    Abstract: Disclosed is a battery separator, comprising two fiber regions comprising glass fibers, and a middle fiber region disposed between them comprising larger average diameter fibers and specified amounts of silica, or fine fibers, or both; and processes for making the separator. Also disclosed is a battery separator, comprising a fiber region and either one or two silica-containing region(s) adjacent thereto, each of the regions containing a specified amount of silica; and processes for making the separator. Such separators are useful, e.g., in lead-acid batteries.
    Type: Grant
    Filed: December 14, 2016
    Date of Patent: April 18, 2017
    Assignee: Hollingsworth & Vose Company
    Inventors: Akshay Ashirgade, Zhiping Jiang
  • Multi-region battery separators
    Patent number: 10431796
    Abstract: Disclosed is a battery separator, comprising two fiber regions comprising glass fibers, and a middle fiber region disposed between them comprising larger average diameter fibers and specified amounts of silica, or fine fibers, or both; and processes for making the separator. Also disclosed is a battery separator, comprising a fiber region and either one or two silica-containing region(s) adjacent thereto, each of the regions containing a specified amount of silica; and processes for making the separator. Such separators are useful, e.g., in lead-acid batteries.
    Type: Grant
    Filed: July 6, 2017
    Date of Patent: October 1, 2019
    Assignee: Hollingsworth & Vose Company
    Inventors: Akshay Ashirgade, Zhiping Jiang, Nicolas Clement
  • Filter paper and method of making same
    Patent number: 4161422
    Abstract: 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: Grant
    Filed: May 10, 1978
    Date of Patent: July 17, 1979
    Assignee: Hollingsworth & Vose Company
    Inventors: Grover C. Lawson, James C. Wilson
  • DURABLE FIBER WEBS
    Publication number: 20190263717
    Abstract: Fiber webs that may be coated and used in filter media are provided. In some embodiments, the fiber web is a non-woven web that is coated with a resin including at least two components (e.g., a first component and a second component) that may react with one another to form a copolymer. In some embodiments, the coated fiber web may be sufficiently self-supporting, durable, and strong, such that filter media and/or elements formed of the web do not require additional support structures (e.g., a scrim).
    Type: Application
    Filed: March 1, 2019
    Publication date: August 29, 2019
    Applicant: Hollingsworth & Vose Company
    Inventors: Richard O. Angus, JR., Cameron Thomson, Sneha Swaminathan
  • SYSTEMS AND METHODS FOR MAKING FIBER WEBS
    Publication number: 20140238629
    Abstract: Systems and methods for forming fiber webs, including those suitable for use as filter media and battery separators, are provided. In some embodiments, the systems and methods involve designs which allow improved control of the fiber web forming process. For example, in certain embodiments involving the flowing of more than one fiber mixtures, the amount of mixing of the fiber mixtures may be controlled to produce fiber webs having different structural and/or performance characteristics. In some embodiments, the systems and methods can be used to form fiber webs having a gradient in a property across a portion of, or the entire, thickness of the fiber web.
    Type: Application
    Filed: May 7, 2014
    Publication date: August 28, 2014
    Applicant: Hollingsworth & Vose Company
    Inventors: Milind Godsay, Mark S. Millar
  • CHARGING OF FILTER MEDIA
    Publication number: 20130168893
    Abstract: Methods and systems for charging fiber webs, including those suitable for use as filter media, are provided. In some embodiments, the methods provided herein involve charging a fiber web by passing a substance through the web under suitable conditions to produce a charged article. The substance may be, for example, a substantially non-polar liquid or gas, a compressed fluid, and/or a supercritical fluid (e.g., carbon dioxide). In some embodiments, the method of charging includes releasing the substance from a container, passing the substance through the fiber web, and, optionally, drawing the substance into a vacuum apparatus after it passes through the fiber web.
    Type: Application
    Filed: December 29, 2011
    Publication date: July 4, 2013
    Applicant: Hollingsworth & Vose Company
    Inventors: Sudhakar Jaganathan, Cameron Thomson
  • High Capacity Filter Medium
    Publication number: 20070220852
    Abstract: Various high performance, high efficiency, long service interval air filter media that are cost effective and easy to manufacture are provided. The filter media of the present invention can have at least two layers comprising blends of binder and non-binder fibers that are thermally bonded to one another and set to caliper in a high velocity forced draft oven. The layers can also be subsequently resin saturated, dried, and optionally cured. The resulting media can be characterized as having a gradient in properties such as fiber composition, fiber diameter, solidity, basis weight, and saturant content.
    Type: Application
    Filed: March 27, 2006
    Publication date: September 27, 2007
    Applicant: Hollingsworth and Vose Company
    Inventors: Norman Lifshutz, Douglas Klauber, Richard Gahan
  • Filter media including a waved filtration layer
    Patent number: 10449474
    Abstract: Filter media including a waved filtration layer are described herein. The filtration layer may be held in a waved configuration by a support layer. In some cases, the filtration layer may have a combination of characteristics (e.g., mean flow pore size, basis weight, amongst others) that can lead to enhanced filtration performance (e.g., reduced air permeability decrease), in particular, in high humidity environments. The filter media may be used to form a variety of filter elements for use in various applications.
    Type: Grant
    Filed: September 18, 2015
    Date of Patent: October 22, 2019
    Assignee: Hollingsworth & Vose Company
    Inventors: Bruce Smith, David T. Healey, Ingrid Staisch
  • ARTICLES COMPRISING FILTER MEDIA WITH IRREGULAR STRUCTURE AND/OR REVERSIBLY STRETCHABLE LAYERS
    Publication number: 20230415081
    Abstract: Filtration articles and filter elements comprising reversibly stretchable layer filter media are generally provided. The filtration articles and filter elements described herein may be used for various applications, including applications as a respirator or respiratory protective equipment, a medical filter, an indoor air filtration article for HVAC and HEPA applications, a cabin air filter for vehicles, a room air purifier filter, a vacuum cleaner filter, a heavy duty air filter, a hydraulic fluid filter, and a process liquid filtration filter.
    Type: Application
    Filed: February 2, 2023
    Publication date: December 28, 2023
    Applicant: Hollingsworth & Vose Company
    Inventors: Bruce Smith, Mohammad A. Hassan, Maxim Silin, Sudheer Jinka, Gregory Wagner Farell, David T. Healey
  • FILTER MEDIA COMPRISING POLYAMIDE FIBERS
    Publication number: 20210370208
    Abstract: Filter media, including those suitable for hydraulic, fuel, HVAC, HEPA, and/or other applications, and related methods are provided. In some embodiments, a filter media described herein may include a layer (e.g., a fine fiber layer) comprising a plurality of fibers comprising polyamide 11. In some embodiments, a filter media comprises a layer (e.g., a fine fiber layer) comprising a plurality of electrospun fibers comprising a material having one or more advantageous properties. In an exemplary set of embodiments, the plurality of fibers comprise polyamide 11 (e.g., Nylon 11). In some embodiments, the polyamide 11 fibers are produced by an electrospinning process.
    Type: Application
    Filed: May 27, 2020
    Publication date: December 2, 2021
    Applicant: Hollingsworth & Vose Company
    Inventors: Praveen Kumar Yegya-Raman, Sneha Swaminathan
  • NANOFIBERS COMPRISING NANOPARTICLES
    Publication number: 20200179848
    Abstract: Articles and methods relating to filter media are generally provided. In some embodiments, a filter media comprises a non-woven fiber web and a backer layer. The non-woven fiber web may comprise a plurality of continuous nanofibers, e.g., continuous nanofibers having an average diameter of less than or equal to 250 nm. The plurality of the nanofibers may comprise a plurality of nanoparticles at least partially embedded therein. In some embodiments, the plurality of nanoparticles makes up less than or equal to 15 wt % of the plurality of nanofibers. In some embodiments, a solidity of the non-woven fiber web is less than or equal to a solidity of the backer layer.
    Type: Application
    Filed: December 5, 2018
    Publication date: June 11, 2020
    Applicant: Hollingsworth & Vose Company
    Inventors: Keith Higginson, Andrew Willis
  • SYSTEMS AND METHODS FOR MAKING FIBER WEBS
    Publication number: 20130025809
    Abstract: Systems and methods for forming fiber webs, including those suitable for use as filter media and battery separators, are provided. In some embodiments, the systems and methods involve designs which allow improved control of the fiber web forming process. For example, in certain embodiments involving the flowing of more than one fiber mixtures, the amount of mixing of the fiber mixtures may be controlled to produce fiber webs having different structural and/or performance characteristics. In some embodiments, the systems and methods can be used to form fiber webs having a gradient in a property across a portion of, or the entire, thickness of the fiber web.
    Type: Application
    Filed: July 26, 2012
    Publication date: January 31, 2013
    Applicant: Hollingsworth & Vose Company
    Inventors: Milind Godsay, Mark S. Millar
  • Fiber webs coated with fiber-containing resins
    Patent number: 10137392
    Abstract: Fiber webs that may be coated and used in filter media are provided. In some embodiments, the fiber web is a non-woven web that is coated with a resin comprising fibers. For example, the resin may include fibers that have sizes (e.g., diameters) in the nano or micron range. In some cases, the fibers distributed within the resin are fibrillated fibers. The respective characteristics and amounts of the fibers in the resin may be selected to impart desirable properties including enhanced mechanical properties and filtration properties (e.g., relatively high strength and air permeability), amongst other benefits.
    Type: Grant
    Filed: December 14, 2012
    Date of Patent: November 27, 2018
    Assignee: Hollingsworth & Vose Company
    Inventor: Mark Snyder
  • Systems and methods for making fiber webs
    Patent number: 8753483
    Abstract: Systems and methods for forming fiber webs, including those suitable for use as filter media and battery separators, are provided. In some embodiments, the systems and methods involve designs which allow improved control of the fiber web forming process. For example, in certain embodiments involving the flowing of more than one fiber mixtures, the amount of mixing of the fiber mixtures may be controlled to produce fiber webs having different structural and/or performance characteristics. In some embodiments, the systems and methods can be used to form fiber webs having a gradient in a property across a portion of, or the entire, thickness of the fiber web.
    Type: Grant
    Filed: July 26, 2012
    Date of Patent: June 17, 2014
    Assignee: Hollingsworth & Vose Company
    Inventors: Milind Godsay, Mark S. Millar
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