Search Patents
  • Graft polymerization, separators, and batteries including the separators
    Patent number: 6955865
    Abstract: A non-woven sheet of polyolefin fibers having opposed major surfaces is disclosed. Some areas of one or both of the major surfaces are hydrophilic as a consequence of an acrylic graft polymerized with the surfaces of the fibers in those areas while the fibers in other areas of that major surface are free of the graft and, as a consequence, remain hydrophobic. A battery separator composed of at least two such non-woven sheets is also disclosed, as well as batteries having a separator composed of at least one such non-woven sheet. Also disclosed is a non-woven sheet of polyolefin fibers where opposed major surfaces of the sheet are hydrophilic as a consequence of such an acrylic acid graft, but the ion exchange coefficients of the two major surfaces are different.
    Type: Grant
    Filed: May 6, 2002
    Date of Patent: October 18, 2005
    Assignee: Hollingsworth & Vose Company
    Inventor: Wai Ming Choi
  • Gasket material
    Patent number: 5240766
    Abstract: A composite gasket material includes a fiber component (3-15% by wt.), an elastomeric binder component (3-15% by wt.), and a solid filer component (60-90% by wt.). The material may additionally include a phenolic or epoxy resin (up to 5 wt. %) and a silicone resin (up to 5 wt. %). The filler includes as a component a salt formed from a multivalent metal cation and a sterically hindered dicarboxylic acid. The salt ingredient typically comprises from about 20 to 80 wt. % of the filler. Gaskets made from this composite material exhibit improved sealability and thermal stability while retaining other desirable mechanical properties. These materials are able to withstand operating temperatures up to about 450.degree. C.
    Type: Grant
    Filed: April 1, 1992
    Date of Patent: August 31, 1993
    Assignee: Hollingsworth & Vose Company
    Inventor: Richard P. Foster
  • Filter media with irregular structure and/or reversibly stretchable layers
    Patent number: 11420143
    Abstract: Articles and methods relating to filter media are generally provided. In some embodiments, a filter media has an irregular surface structure. For instance, the filter media may comprise a plurality of peaks that are irregular in one or more ways. A ratio of a peak height standard deviation to an average peak height may be greater than or equal to 0.05, and/or a ratio of a peak spacing standard deviation to an average peak spacing may be greater than or equal to 0.08. In some embodiments, a filter media comprises a non-woven fiber web having a layer thickness of greater than 0.3 mm and/or a stiffness of less than or equal to 100 mg.
    Type: Grant
    Filed: May 4, 2020
    Date of Patent: August 23, 2022
    Assignee: Hollingsworth & Vose Company
    Inventors: Bruce Smith, Mohammad A. Hassan, Maxim Silin, Sudheer Jinka, Greg Wagner Farell, David T. Healey
  • BATTERY SEPARATORS COMPRISING INORGANIC PARTICLES
    Publication number: 20160301053
    Abstract: 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: Application
    Filed: April 10, 2015
    Publication date: October 13, 2016
    Applicant: Hollingsworth & Vose Company
    Inventor: Zhiping Jiang
  • Battery separators comprising inorganic particles
    Patent number: 9786885
    Abstract: 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: Grant
    Filed: April 10, 2015
    Date of Patent: October 10, 2017
    Assignee: Hollingsworth & Vose Company
    Inventor: Zhiping Jiang
  • FILTER MEDIA INCLUDING A FILTRATION LAYER COMPRISING SYNTHETIC FIBERS
    Publication number: 20190321760
    Abstract: Filter media comprising a filtration layer comprising synthetic fibers (e.g., pleatable backer layer) and related components, systems, and methods associated herewith are provided. In some embodiments, the filtration layer comprising synthetic fibers may be a non-woven web comprising a blend of coarse and fine diameter fibers. The filtration layer comprising synthetic fibers may be designed to have desirable performance properties without compromising certain mechanical properties, such as the pleatability of the media. In some embodiments, a filter media, described herein, may comprise the filtration layer comprising synthetic fibers and an efficiency layer. 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: Application
    Filed: February 21, 2019
    Publication date: October 24, 2019
    Applicant: Hollingsworth & Vose Company
    Inventors: Nagendra Anantharamaiah, Sudhakar Jaganathan, Gerald Gadbois, Maxim Silin, Mark A. Gallimore
  • Metal composite gasket material
    Patent number: 5286574
    Abstract: A composite gasket material includes a fiber component (3-15% by wt.), an elastomeric binder component (3-15% by wt.), and a solid filer component (60-90% by wt.). The material may additionally include a phenolic or epoxy resin (up to 5 wt. %) and a silicone resin (up to 5 wt. %). The filler includes as a component a salt formed from a multivalent metal cation and a sterically hindered dicarboxylic acid. The salt ingredient typically comprises from about 20 to 80 wt. % of the filler. Gaskets made from this composite material exhibit improved sealability and thermal stability while retaining other desirable mechanical properties. These materials are able to withstand operating temperatures up to about 450.degree. C.
    Type: Grant
    Filed: June 11, 1993
    Date of Patent: February 15, 1994
    Assignee: Hollingsworth & Vose Company
    Inventor: Richard P. Foster
  • Filter media and articles including dendrimers and/or other components
    Patent number: 8114197
    Abstract: 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: Grant
    Filed: January 22, 2010
    Date of Patent: February 14, 2012
    Assignee: Hollingsworth & Vose Company
    Inventors: David F. Sealey, Stuart Williams
  • FILTER MEDIA INCLUDING A FILTRATION LAYER COMPRISING SYNTHETIC FIBERS
    Publication number: 20170232371
    Abstract: Filter media comprising a filtration layer comprising synthetic fibers (e.g., pleatable backer layer) and related components, systems, and methods associated herewith are provided. In some embodiments, the filtration layer comprising synthetic fibers may be a non-woven web comprising a blend of coarse and fine diameter fibers. The filtration layer comprising synthetic fibers may be designed to have desirable performance properties without compromising certain mechanical properties, such as the pleatability of the media. In some embodiments, a filter media, described herein, may comprise the filtration layer comprising synthetic fibers and an efficiency layer. 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: Application
    Filed: February 17, 2016
    Publication date: August 17, 2017
    Applicant: Hollingsworth & Vose Company
    Inventors: Nagendra Anantharamaiah, Sudhakar Jaganathan, Gerald Gadbois, Maxim Silin, Mark A. Gallimore
  • FILTER MEDIA INCLUDING A MULTI-PHASE PRE-FILTER
    Publication number: 20180361287
    Abstract: Filter media, as well as related components, systems, and methods, are described herein. In some embodiments, the filter media comprises one or more layers including, for example, a pre-filter layer and a main filter layer. The pre-filter layer may comprise a non-woven web (e.g., a wet-laid non-woven web). In some instances, the non-woven web comprises two or more phases. Each phase of the pre-filter layer may be characterized by a surface average fiber diameter (SAFD), and the SAFD may vary across at least a portion of the thickness of the pre-filter layer. The filter media may have improved dust-holding capacities for dust particles having a wide range of particle sizes, and/or improved mechanical strength (e.g., stiffness).
    Type: Application
    Filed: July 17, 2017
    Publication date: December 20, 2018
    Applicant: Hollingsworth & Vose Company
    Inventors: Xiaodan Zhang, Maxim Silin, Douglas M. Guimond, David T. Healey
  • FILTER MEDIA SUITABLE FOR HYDRAULIC APPLICATIONS
    Publication number: 20150182885
    Abstract: Filter media, including those suitable for hydraulic applications, and related components, systems, and methods associated therewith are provided. The filter media described herein may include two or more layers, at least one of the layers having a relatively high percentage of microglass fibers. Additionally, the filter media may be designed such that the ratio of average fiber diameters between two layers is relatively small, which can lead to a relatively low resistance ratio between the layers. In some embodiments, at least one layer of the filter media comprises synthetic polymer fibers. Certain filter media described herein may have desirable properties including high dirt holding capacity and a low resistance to fluid flow. The media may be incorporated into a variety of filter element products including hydraulic filters.
    Type: Application
    Filed: December 29, 2014
    Publication date: July 2, 2015
    Applicant: Hollingsworth & Vose Company
    Inventors: Cameron Thomson, Milind Godsay, Randall Keisler
  • FILTER MEDIA SUITABLE FOR HYDRAULIC APPLICATIONS
    Publication number: 20110079553
    Abstract: Filter media, including those suitable for hydraulic applications, and related components, systems, and methods associated therewith are provided. The filter media described herein may include two or more layers, at least one of the layers having a relatively high percentage of microglass fibers. Additionally, the filter media may be designed such that the ratio of average fiber diameters between two layers is relatively small, which can lead to a relatively low resistance ratio between the layers. In some embodiments, at least one layer of the filter media comprises synthetic polymer fibers. Certain filter media described herein may have desirable properties including high dirt holding capacity and a low resistance to fluid flow. The media may be incorporated into a variety of filter element products including hydraulic filters.
    Type: Application
    Filed: October 6, 2010
    Publication date: April 7, 2011
    Applicant: Hollingsworth & Vose Company
    Inventors: Cameron Thomson, Milind Godsay, Randall Keisler
  • FILTER MEDIA WITH FINE STAPLE FIBERS
    Publication number: 20150174509
    Abstract: Filter media, including those suitable for hydraulic applications, and related components, systems, and methods associated therewith are provided. In some embodiments, a filter media may include a non-woven layer comprising blend of glass fibers and polymeric staple fibers. The polymeric staple fibers may have a relatively small diameter. The non-woven layer comprising the fiber may have desirable properties such as one or more of a low micron rating for beta efficiency, high dust holding capacity, and/or a low resistance to fluid flow. In certain embodiments, the filter media may include two or more layers, at least one of the layers including a non-woven layer comprising the fiber blend. In some such cases, the filter media may include one or more layers that serve to enhance the overall properties of the filter media.
    Type: Application
    Filed: December 20, 2013
    Publication date: June 25, 2015
    Applicant: Hollingsworth & Vose Company
    Inventor: Sneha Swaminathan
  • Battery separators comprising inorganic particles
    Patent number: 10644289
    Abstract: 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: Grant
    Filed: July 12, 2017
    Date of Patent: May 5, 2020
    Assignee: Hollingsworth & Vose Company
    Inventor: Zhiping Jiang
  • FILTER MEDIA AND ELEMENTS WITH FINE STAPLE FIBERS
    Publication number: 20150360156
    Abstract: Filter media, including those suitable for fuel and/or hydraulic applications, and related components, systems, and methods associated therewith are provided. In some embodiments, a filter media may include a non-woven layer comprising blend of glass fibers and polymeric staple fibers. The polymeric staple fibers may have a relatively small diameter. The non-woven layer comprising the fiber may have desirable properties such as one or more of a low micron rating for beta efficiency, high dust holding capacity, and/or a low resistance to fluid flow. In certain embodiments, the filter media may include two or more layers, at least one of the layers including a non-woven layer comprising the fiber blend. In some such cases, the filter media may include one or more layers that serve to enhance the overall properties of the filter media.
    Type: Application
    Filed: June 19, 2015
    Publication date: December 17, 2015
    Applicant: Hollingsworth & Vose Company
    Inventor: Sneha Swaminathan
  • SYSTEMS AND METHODS FOR MAKING FIBER WEBS
    Publication number: 20130009335
    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 may involve the use of one or more fiber mixtures to form a fiber web. The fiber mixtures may flow in different portions of a system for forming a fiber web that may be separated by a lamella, and may join at a fiber web forming zone to produce a fiber web having multiple layers. The amount of mixing of the fiber mixtures at or near the fiber web forming zone may be controlled to produce fiber webs having different structural and/or performance characteristics. In some embodiments, the systems and methods described herein 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 11, 2012
    Publication date: January 10, 2013
    Applicant: Hollingsworth & Vose Company
    Inventors: Douglas M. Guimond, Mark S. Millar, David Vallery, Milind Godsay
  • Glass fiber separators for lead-acid batteries
    Patent number: 6495286
    Abstract: A glass fiber separator material is disclosed. The separator is composed of a mass of intermeshed glass fibers substantially all of which have a fiber diameter not greater than about 20 &mgr;m, and at least 5 percent w/w of which have a fiber diameter less than 1 &mgr;m, and, distributed through the glass fibers, and from 0.2 percent w/w to 20 percent w/w of cellulose fibrils. The fibrils are from a slurry having a Canadian freeness sufficiently low that the separator material has a tensile strength greater than an otherwise identical separator where glass fibers having an average diameter greater than 1 &mgr;m replace the cellulose fibrils.
    Type: Grant
    Filed: October 9, 2001
    Date of Patent: December 17, 2002
    Assignee: Hollingsworth & Vose Company
    Inventors: George C. Zguris, Frank C. Harmon, Jr.
  • Systems and methods for making fiber webs
    Patent number: 8877011
    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 may involve the use of one or more fiber mixtures to form a fiber web. The fiber mixtures may flow in different portions of a system for forming a fiber web that may be separated by a lamella, and may join at a fiber web forming zone to produce a fiber web having multiple layers. The amount of mixing of the fiber mixtures at or near the fiber web forming zone may be controlled to produce fiber webs having different structural and/or performance characteristics. In some embodiments, the systems and methods described herein 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: May 11, 2012
    Date of Patent: November 4, 2014
    Assignee: Hollingsworth & Vose Company
    Inventors: Douglas M. Guimond, Mark S. Millar, David Vallery, Milind Godsay
  • BATTERY SEPARATORS AND RELATED METHODS
    Publication number: 20180145298
    Abstract: Battery separators and related methods are generally provided. The battery separators may include one or more fiber webs. In some embodiments, one or more fiber webs of the battery separator comprises a plurality of glass fibers wherein at least a portion of the glass fibers are fused. The fiber web(s) may include, for example, glass fibers having particular glass compositions (e.g., a particular Li2O content), and/or at least two different glass fibers having a minimum difference in softening temperatures. The one or more fiber webs may be designed to have desirable properties such as relatively high structural integrity (e.g., during acid filling of the battery such as in lead-acid batteries), enhanced separator stability, and/or enhanced wettability (e.g., wettability to acid) as compared to certain existing battery separators.
    Type: Application
    Filed: November 23, 2016
    Publication date: May 24, 2018
    Applicant: Hollingsworth & Vose Company
    Inventors: Yuri Vulfson, Nicolas Clement, John J. Herrington, III
  • Filter media suitable for hydraulic applications
    Patent number: 8951420
    Abstract: Filter media, including those suitable for hydraulic applications, and related components, systems, and methods associated therewith are provided. The filter media described herein may include two or more layers, at least one of the layers having a relatively high percentage of microglass fibers. Additionally, the filter media may be designed such that the ratio of average fiber diameters between two layers is relatively small, which can lead to a relatively low resistance ratio between the layers. The filter media has desirable properties including high dirt holding capacity with low basis weight and a low resistance to fluid flow. The media may be incorporated into a variety of filter element products including hydraulic filters.
    Type: Grant
    Filed: April 3, 2009
    Date of Patent: February 10, 2015
    Assignee: Hollingsworth & Vose Company
    Inventors: Milind Godsay, Randall Keisler
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