Patents by Inventor Ronald W. Call
Ronald W. Call 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).
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Patent number: 11626349Abstract: A multi-layered battery separator for a lithium secondary battery includes a first layer of a dry processed membrane bonded to a second layer of a wet processed membrane. The first layer may be made of a polypropylene based resin. The second layer may be made of a polyethylene based resin. The separator may have more than two layers. The separator may have a ratio of TD/MD tensile strength in the range of about 1.5-3.0. The separator may have a thickness of about 35.0 microns or less. The separator may have a puncture strength of greater than about 630 gf. The separator may have a dielectric breakdown of at least about 2000V.Type: GrantFiled: March 19, 2020Date of Patent: April 11, 2023Assignee: Celgard, LLCInventors: Lie Shi, Jill V. Watson, Ronald W. Call, Ronnie E. Smith
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Publication number: 20210043904Abstract: A battery separator comprises a co-extruded, microporous membrane having at least two layers made of extrudable polymers and having: a uniform thickness defined by a standard deviation of <0.80 microns (?m); or an interply adhesion as defined by a peel strength >60 grams.Type: ApplicationFiled: October 26, 2020Publication date: February 11, 2021Inventors: Ronald W. Call, C. William Fulk, JR., Lie Shi, Xiaomin Zhang, Khuy V. Nguyen
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Patent number: 10818899Abstract: A battery separator comprises a co-extruded, microporous membrane having at least two layers made of extrudable polymers and having: a uniform thickness defined by a standard deviation of <0.80 microns (?m); or an interply adhesion as defined by a peel strength >60 grams.Type: GrantFiled: May 15, 2018Date of Patent: October 27, 2020Assignee: Celgard, LLCInventors: Ronald W. Call, C. William Fulk, Jr., Lie Shi, Xiaomin Zhang, Khuy V. Nguyen
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Publication number: 20200219796Abstract: A multi-layered battery separator for a lithium secondary battery includes a first layer of a dry processed membrane bonded to a second layer of a wet processed membrane. The first layer may be made of a polypropylene based resin. The second layer may be made of a polyethylene based resin. The separator may have more than two layers. The separator may have a ratio of TD/MD tensile strength in the range of about 1.5-3.0. The separator may have a thickness of about 35.0 microns or less. The separator may have a puncture strength of greater than about 630 gf. The separator may have a dielectric breakdown of at least about 2000V.Type: ApplicationFiled: March 19, 2020Publication date: July 9, 2020Inventors: Lie Shi, Jill V. Watson, Ronald W. Call, Ronnie E. Smith
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Patent number: 10601012Abstract: A multi-layered battery separator for a lithium secondary battery includes a first layer of a dry processed membrane bonded to a second layer of a wet processed membrane. The first layer may be made of a polypropylene based resin. The second layer may be made of a polyethylene based resin. The separator may have more than two layers. The separator may have a ratio of TD/MD tensile strength in the range of about 1.5-3.0. The separator may have a thickness of about 35.0 microns or less. The separator may have a puncture strength of greater than about 630 gf. The separator may have a dielectric breakdown of at least about 2000V.Type: GrantFiled: September 2, 2016Date of Patent: March 24, 2020Assignee: Celgard, LLCInventors: Lie Shi, Jill V. Watson, Ronald W. Call, Ronnie E. Smith
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Publication number: 20180261817Abstract: A battery separator comprises a co-extruded, microporous membrane having at least two layers made of extrudable polymers and having: a uniform thickness defined by a standard deviation of <0.80 microns (?m); or an interply adhesion as defined by a peel strength >60 grams.Type: ApplicationFiled: May 15, 2018Publication date: September 13, 2018Inventors: Ronald W. Call, C. William Fulk, JR., Lie Shi, Xiaomin Zhang, Khuy V. Nguyen
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Patent number: 10003058Abstract: A battery separator comprises a co-extruded, microporous membrane having at least two layers made of extrudable polymers and having: a uniform thickness defined by a standard deviation of <0.80 microns (?m); or an interply adhesion as defined by a peel strength >60 grams.Type: GrantFiled: November 17, 2006Date of Patent: June 19, 2018Assignee: Celgard, LLCInventors: Ronald W. Call, C. William Fulk, Jr., Lie Shi, Xiaomin Zhang, Khuy V. Nguyen
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Publication number: 20180134024Abstract: A microporous battery separator is provided having a first co-extruded multilayered portion and a second co-extruded multilayered portion. The two portions are bonded together. In a preferred embodiment, the battery separator has two substantially identical multilayered portions bonded together face-to-face. Each of the two multilayered portions has at least one strength layer and at least one shutdown layer. Methods for making the battery separators are also provided. Preferably, a tubular multilayered film is extruded, and collapsed onto itself to form a multilayered battery separator precursor. The precursor is then bonded and annealed before it is stretched to form a microporous multilayer battery separator.Type: ApplicationFiled: January 16, 2018Publication date: May 17, 2018Inventors: Ronald W.. Call, Donald K. Simmons, Ta-Hua Yu
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Patent number: 9908317Abstract: A microporous battery separator is provided having a first co-extruded multilayered portion and a second co-extruded multilayered portion. The two portions are bonded together. In a preferred embodiment, the battery separator has two substantially identical multilayered portions bonded together face-to-face. Each of the two multilayered portions has at least one strength layer and at least one shutdown layer. Methods for making the battery separators are also provided. Preferably, a tubular multilayered film is extruded, and collapsed onto itself to form a multilayered battery separator precursor. The precursor is then bonded and annealed before it is stretched to form a microporous multilayer battery separator.Type: GrantFiled: May 7, 2007Date of Patent: March 6, 2018Assignee: Celgard, LLCInventors: Ronald W. Call, Donald K. Simmons, Ta-Hua Yu
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Patent number: 9570727Abstract: A battery separator is a microporous membrane. The membrane has a major volume of a thermoplastic polymer and a minor volume of an inert particulate filler. The filler is dispersed throughout the polymer. The membrane exhibits a maximum Z-direction compression of 95% of the original membrane thickness. Alternatively, the battery separator is a microporous membrane having a TMA compression curve with a first substantially horizontal slope between ambient temperature and 125° C., a second substantially horizontal slope at greater than 225° C. The curve of the first slope has a lower % compression than the curve of the second slope. The curve of the second slope is not less than 5% compression. The TMA compression curve is graphed so that the Y-axis represents % compression from original thickness and the X-axis represents temperature.Type: GrantFiled: October 18, 2005Date of Patent: February 14, 2017Assignee: Celgard LLCInventors: Zhengming Zhang, Khuy V. Nguyen, Pankaj Arora, Ronald W. Call, Donald K. Simmons, Tien Dao
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Patent number: 9455432Abstract: A multi-layered battery separator for a lithium secondary battery includes a first layer of a dry processed membrane bonded to a second layer of a wet processed membrane. The first layer may be made of a polypropylene based resin. The second layer may be made of a polyethylene based resin. The separator may have more than two layers. The separator may have a ratio of MD/TD tensile strength in the range of about 1.5-3.0. The separator may have a thickness of about 35.0 microns or less. The separator may have a puncture strength of greater than about 630 gf. The separator may have a dielectric breakdown of at least about 2000V.Type: GrantFiled: March 14, 2014Date of Patent: September 27, 2016Assignee: Celgard, LLCInventors: Lie Shi, Jill V. Watson, Ronald W. Call, Ronnie E. Smith
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Patent number: 9112214Abstract: A battery separator comprises a multi-layered film, individual layers of film having been bonded together by heat and pressure, having a peel strength of greater than or equal to 40 grams per inch (1.6 g/mm) and a thickness of ?25 microns. A method for making a battery separator comprises the steps of: extruding and winding up a first precursor film, extruding and winding up a second precursor film, unwinding the first and second precursor films, stacking up the first and second precursor films to form a single stacked precursor, laminating the single stacked precursor film, winding up the laminated single stacked precursor film, stacking up a plurality of laminated single stacked precursor films, and making microporous the stacked plurality of laminated single stacked precursor films.Type: GrantFiled: March 7, 2007Date of Patent: August 18, 2015Assignee: Celgard Inc.Inventor: Ronald W. Call
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Publication number: 20140272533Abstract: A multi-layered battery separator for a lithium secondary battery includes a first layer of a dry processed membrane bonded to a second layer of a wet processed membrane. The first layer may be made of a polypropylene based resin. The second layer may be made of a polyethylene based resin. The separator may have more than two layers. The separator may have a ratio of TD/MD tensile strength in the range of about 1.5-3.0. The separator may have a thickness of about 35.0 microns or less. The separator may have a puncture strength of greater than about 630 gf. The separator may have a dielectric breakdown of at least about 2000V.Type: ApplicationFiled: March 14, 2014Publication date: September 18, 2014Applicant: Celgard, LLCInventors: Lie SHI, Jill V. Watson, Ronald W. Call, Ronnie E. Smith
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Patent number: 8486556Abstract: A multi-layer microporous battery separator which comprises: a high molecular weight polypropylene layer having a melt flow index of ?1.2 measured at layer; a polyethylene layer; and a high molecular weight polypropylene layer having a melt flow index of ?1.2 measured at layer. The resulting microporous battery separator which is formed by a dry stretch process produces the microporous battery separator which has a porosity of ?37% while maintaining a gurley from 13-25 seconds and a thickness of ?25 microns.Type: GrantFiled: April 7, 2010Date of Patent: July 16, 2013Assignee: Celgard LLCInventors: Ronald W. Call, Lie Shi, Zhengming Zhang, Shizuo Ogura, Xiangyun Wei, Premanand Ramadass
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Patent number: 7790320Abstract: A battery separator is a microporous membrane. The membrane has a major volume of a thermoplastic polymer and a minor volume of an inert particulate filler. The filler is dispersed throughout the polymer. The membrane exhibits a maximum Z-direction compression of 95% of the original membrane thickness. Alternatively, the battery separator is a microporous membrane having a TMA compression curve with a first substantially horizontal slope between ambient temperature and 125° C., a second substantially horizontal slope at greater than 225° C. The curve of the first slope has a lower % compression than the curve of the second slope. The curve of the second slope is not less than 5% compression. The TMA compression curve is graphed so that the Y-axis represents % compression from original thickness and the X-axis represents temperature.Type: GrantFiled: January 2, 2007Date of Patent: September 7, 2010Assignee: Celgard LLCInventors: Pankaj Arora, Ronald W. Call, Tien Dao, Khuy V. Nguyen, Donald K. Simmons, Zhengming Zhang
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Publication number: 20100209758Abstract: A multi-layer microporous battery separator which comprises: a high molecular weight polypropylene layer having a melt flow index of ?1.2 measured at layer; a polyethylene layer; and a high molecular weight polypropylene layer having a melt flow index of ?1.2 measured at layer. The resulting microporous battery separator which is formed by a dry stretch process produces the microporous battery separator which has a porosity of ?37% while maintaining a gurley from 13-25 seconds and a thickness of ?25 microns.Type: ApplicationFiled: April 7, 2010Publication date: August 19, 2010Inventors: Ronald W. Call, Lie Shi, Zhengming Zhang, Shizuo Ogura, Xiangyun Wei, Premanand Ramadass
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Publication number: 20080268345Abstract: A battery separator is a microporous membrane. The membrane has a major volume of a thermoplastic polymer and a minor volume of an inert particulate filler. The filler is dispersed throughout the polymer. The membrane exhibits a maximum Z-direction compression of 95% of the original membrane thickness. Alternatively, the battery separator is a microporous membrane having a TMA compression curve with a first substantially horizontal slope between ambient temperature and 125° C., a second substantially horizontal slope at greater than 225° C. The curve of the first slope has a lower % compression than the curve of the second slope. The curve of the second slope is not less than 5% compression. The TMA compression curve is graphed so that the Y-axis represents % compression from original thickness and the X-axis represents temperature.Type: ApplicationFiled: October 18, 2005Publication date: October 30, 2008Inventors: Zhengming Zhang, Khuy V. Nguyen, Pankaj Arora, Ronald W. Call, Donald K. Simmons, Tien Dao
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Publication number: 20080118827Abstract: A battery separator comprises a co-extruded, microporous membrane having at least two layers made of extrudable polymers and having: a uniform thickness defined by a standard deviation of <0.80 microns (?m); or an interply adhesion as defined by a peel strength >60 grams.Type: ApplicationFiled: November 17, 2006Publication date: May 22, 2008Inventors: Ronald W. Call, C. William Fulk, Lie Shi, Xiaomin Zhang, Khuy V. Nguyen
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Patent number: 6921608Abstract: The present invention is directed to a battery separator. The battery separator comprises a microporous film having a first portion and a second portion. The first portion is bonded to the second portion. The bond has a strength greater than 5 g/in. The film has a thickness less than 1.7 mils, a Gurley of less than 50 sec/10 cc, and a puncture strength of greater than 400 g/mil.Type: GrantFiled: August 21, 2002Date of Patent: July 26, 2005Assignee: Celgard, Inc.Inventors: Ronald W. Call, J. Robert Dees, Shizuo Ogura, Donald K. Simmons, Xiangyun Wei
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Patent number: 6692867Abstract: A method for removing a pin from a battery assembly by the step of providing a separator comprising: a microporous membrane having an exterior surface portion of polypropylene, the polypropylene including at least 50 ppm of metallic stearate, preferably calcium stearate Static and being adapted to exhibit a pin removal force ≦7100 g.Type: GrantFiled: October 12, 2001Date of Patent: February 17, 2004Assignee: Celgard Inc.Inventors: Robert A. Nark, Ronald W. Call, Donald K. Simmons, Mark W. Ferebee