Patents Assigned to Hollingsworth & Vose Company
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Publication number: 20170232372Abstract: Filter media including a filtration layer comprising fibers (e.g., synthetic fibers) comprising a flame retardant and related components, systems, and methods associated herewith are provided. In some embodiments, a filtration layer may include a nonwoven web (e.g., wet-laid nonwoven web) comprising fibers including a certain flame retardant that has a relatively low concentration of or is substantially free of certain undesirable and/or toxic components (e.g., halogens). In certain embodiments, the nonwoven web may also comprise a blend of fibers. For instance, in some embodiments, the nonwoven web may also comprise a blend of coarse and fine diameter synthetic fibers that impart beneficial performance properties to the filtration layer. In some embodiments, the filtration layer may be designed to have a desirable flame retardancy (e.g., F1 rating, K1 rating) and performance properties without compromising certain mechanical properties (e.g., pleatability of the media) and/or environmental attributes (e.g.Type: ApplicationFiled: September 30, 2016Publication date: August 17, 2017Applicant: Hollingsworth & Vose CompanyInventors: Xiaodan Zhang, Douglas M. Guimond, Carrie Liu, Nagendra Anantharamaiah, Sudhakar Jaganathan, Gerald Gadbois, Maxim Silin, Mark A. Gallimore
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Patent number: 9728756Abstract: 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: GrantFiled: February 8, 2017Date of Patent: August 8, 2017Assignee: Hollingsworth & Vose CompanyInventors: Akshay Ashirgade, Zhiping Jiang
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Patent number: 9718020Abstract: Various high performance, high efficiency filter media are provided that are cost effective and easy to manufacture. In particular, various filter media are provided having at least one layer with a waved configuration that results in an increased surface area, thereby enhancing various properties of the filter media. The filter media can be used to form a variety of filter elements for use in various applications.Type: GrantFiled: September 30, 2013Date of Patent: August 1, 2017Assignee: Hollingsworth & Vose CompanyInventors: David T. Healey, Richard Gahan
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Patent number: 9694306Abstract: Polymer compositions that may be used to form fibers for a fiber web are generally described. In some embodiments, certain properties of the polymer compositions (e.g., molecular weight distribution, melt flow index, melt elasticity, and/or melt toughness) may allow the formation of fiber webs having fine fibers and a relatively low amount of process defects. In some instances, these properties of the polymer composition may be achieved by combining two or more polymer components. Fiber webs formed using the polymer composition may have increased performance and/or better structural characteristics compared to fibers webs formed using a single polymer component.Type: GrantFiled: May 24, 2013Date of Patent: July 4, 2017Assignee: Hollingsworth & Vose CompanyInventors: Nagendra Anantharamaiah, William S. Freeman, Bruce Smith
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Patent number: 9687771Abstract: Various high performance, high efficiency filter media are provided that are cost effective and easy to manufacture. In particular, various filter media are provided having at least one layer with a waved configuration that results in an increased surface area, thereby enhancing various properties of the filter media. The filter media can be used to form a variety of filter elements for use in various applications.Type: GrantFiled: October 8, 2014Date of Patent: June 27, 2017Assignee: Hollingsworth & Vose CompanyInventors: David T. Healey, Richard E. Gahan
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Publication number: 20170179454Abstract: In some embodiments, a battery separator described herein may comprise a layer having a relatively low apparent density; for example, the density that includes any unoccupied space within the outermost boundaries of the layer may be relatively low. The low apparent density may be attributed to, at least in part, the geometry of the layer. For instance, in some embodiments, the layer may include undulations and/or have at least one non-planar surface (e.g., a corrugated layer; an embossed layer). In some embodiments, a battery comprising a layer having a relatively low apparent density may have desirable properties, including relatively low electrical resistance and/or relatively high capacity. The battery separators described herein may be well suited for a variety of battery types, including lead acid batteries.Type: ApplicationFiled: March 20, 2015Publication date: June 22, 2017Applicant: Hollingsworth & Vose CompanyInventors: Gubbi Krishnappa Natesh, Krishna Marchigowda, Basavaraju Girisha, Kameswara Rao Patchigolla Venkata, Nicolas Clement, Akshay Ashirgade, Sachin Kumar, John A. Wertz, Richard O. Angus, JR., Zhiping Jiang
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Publication number: 20170170442Abstract: 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: ApplicationFiled: February 8, 2017Publication date: June 15, 2017Applicant: Hollingsworth & Vose CompanyInventors: Akshay Ashirgade, Zhiping Jiang
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Publication number: 20170128892Abstract: Fiber webs which are used in filter media are described herein. In some embodiments, the fiber webs include fibrillated fibers and optionally non-fibrillated fibers, amongst other optional components (e.g., binder resin). In some embodiments, the fiber webs include limited amounts of, or no, glass fiber. The respective characteristics and amounts of the fibrillated fibers are selected to impart desirable properties including mechanical properties and filtration properties (e.g., dust holding capacity and efficiency), amongst other benefits.Type: ApplicationFiled: October 18, 2016Publication date: May 11, 2017Applicant: Hollingsworth & Vose CompanyInventors: Howard Yu, Sneha Swaminathan
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Patent number: 9627668Abstract: 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: GrantFiled: December 14, 2016Date of Patent: April 18, 2017Assignee: Hollingsworth & Vose CompanyInventors: Akshay Ashirgade, Zhiping Jiang
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Publication number: 20170092917Abstract: 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: ApplicationFiled: December 14, 2016Publication date: March 30, 2017Applicant: Hollingsworth & Vose CompanyInventors: Akshay Ashirgade, Zhiping Jiang
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Publication number: 20170080368Abstract: 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: ApplicationFiled: September 18, 2015Publication date: March 23, 2017Applicant: Hollingsworth & Vose CompanyInventors: Bruce Smith, David T. Healey, Ingrid Staisch
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Patent number: 9577236Abstract: 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: GrantFiled: February 9, 2016Date of Patent: February 21, 2017Assignee: Hollingsworth & Vose CompanyInventors: Akshay Ashirgade, Zhiping Jiang
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Publication number: 20160361674Abstract: Filter media comprising fine staple fibers and related components, systems, and methods associated therewith are provided. In some embodiments, a filter media may include a layer (e.g., a wet laid layer) comprising polymeric staple fibers having a relatively small average diameter (e.g., less than or equal to about 1 micron). The polymeric staple fiber layer may be designed to impart desirable properties to the filter media, such as a high particulate efficiency and/or fluid separation efficiency, while having relatively minimal or no adverse effects on one or more properties of the filter media that are important for a given application. The filter media, described herein, may be particularly well-suited for a variety of applications.Type: ApplicationFiled: June 9, 2016Publication date: December 15, 2016Applicant: Hollingsworth & Vose CompanyInventors: Sneha Swaminathan, Svetlana Krupnikov
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Patent number: 9511330Abstract: Fiber webs which are used in filter media are described herein. In some embodiments, the fiber webs include fibrillated fibers and optionally non-fibrillated fibers, amongst other optional components (e.g., binder resin). In some embodiments, the fiber webs include limited amounts of, or no, glass fiber. The respective characteristics and amounts of the fibrillated fibers are selected to impart desirable properties including mechanical properties and filtration properties (e.g., dust holding capacity and efficiency), amongst other benefits.Type: GrantFiled: December 19, 2013Date of Patent: December 6, 2016Assignee: Hollingsworth & Vose CompanyInventors: Howard Yu, Sneha Swaminathan
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Publication number: 20160303498Abstract: Filter media comprising nanofibers and related components, systems, and methods associated therewith are provided. In some embodiments, a filter media may comprise a first fiber web and a second fiber web designed to impart beneficial properties to the filter media. For instance, in some embodiments, the first fiber web may provide high particulate efficiency and the second fiber web may provide suitable capacity. In some embodiments, the first and second fiber webs may have certain properties (e.g., water contact angle, surface energy) that are similar or substantially the same. The similarities between the first and second fiber webs may serve to enhance the structural stability of the filter media under various conditions (e.g., high temperature, high pressure, steam sterilization) and/or permeability to certain fluids (e.g., water). Filter media, as described herein, may be particularly well-suited for applications that involve liquid filtration.Type: ApplicationFiled: April 17, 2015Publication date: October 20, 2016Applicant: Hollingsworth & Vose CompanyInventors: Abdoulaye Doucouré, Randall B. Keisler
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Publication number: 20160301053Abstract: Battery separators are generally provided. In some embodiments, the battery separators may comprise a non-woven web including a plurality of inorganic particles (e.g., silica). The non-woven web may include, in some embodiments, a plurality of relatively coarse glass fibers (e.g., having an average diameter of greater than about 1.5 microns), e.g., such that the non-woven web has a particular largest pore size and median pore size. The combination of inorganic particles with a non-woven web having features described herein may exhibit enhanced electrolyte stratification distance and/or reduced electrolyte filling time. In some embodiments, such improvements may be achieved while having relatively minimal or no adverse effects on another property of the battery separator and/or the overall battery.Type: ApplicationFiled: April 10, 2015Publication date: October 13, 2016Applicant: Hollingsworth & Vose CompanyInventor: Zhiping Jiang
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Publication number: 20160214044Abstract: Filter media having a gradient in a property and methods associated with such media are provided. In some embodiments, a filter media may have a gradient in mean pore size. The gradient in mean pore size may be across at least a portion of the thickness of the filter media. In some embodiments, the gradient can be represented by an exponential function. The exponential gradient in mean pore size may impart desirable properties to the filter media including enhanced filtration properties (e.g., relatively high dust holding capacity and efficiency), amongst other benefits. The filter media may be particularly well-suited for applications that involve filtering liquids (e.g., hydraulics, fuel, lube, water), though the media may also be used in other applications.Type: ApplicationFiled: August 22, 2014Publication date: July 28, 2016Applicant: HOLLINGSWORTH & VOSE COMPANYInventors: Maxim Silin, Sudhakar Jaganathan
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Publication number: 20160184751Abstract: 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: ApplicationFiled: December 30, 2015Publication date: June 30, 2016Applicant: Hollingsworth & Vose CompanyInventors: John A. Wertz, Douglas M. Guimond
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Publication number: 20160175752Abstract: Filter media comprising a pre-filter layer and related components, systems, and methods associated therewith are provided. In some embodiments, the pre-filter layer may be designed to impart desirable properties to the filter media, such as a high gamma and/or long service life, while having relatively minimal or no adverse effects on another property of the filter media that is important for a given application. For instance, a pre-filter layer may be used to improve the upstream removal of fine particulate matter, which may clog a downstream efficiency layer comprising submicron fibers and reduce filtration performance. The pre-filter layer may be configured to increase service life and/or increase the gamma of the filter media. Filter media, as described herein, may be particularly well-suited for applications that involve filtering air, though the media may also be used in other applications.Type: ApplicationFiled: December 19, 2014Publication date: June 23, 2016Applicant: Hollingsworth & Vose CompanyInventors: Sudhakar Jaganathan, Nagendra Anantharamaiah, Maxim Silin
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Publication number: 20160166960Abstract: 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: ApplicationFiled: November 11, 2015Publication date: June 16, 2016Applicant: Hollingsworth & Vose CompanyInventors: Wai Ming Choi, Karin N. Soper