Patents by Inventor Alketa Gjoka
Alketa Gjoka 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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Publication number: 20230372880Abstract: Described are porous polymeric membrane composites that contain crosslinked fluorinated ionomer at a surface of a microporous membrane support, and related methods.Type: ApplicationFiled: May 19, 2023Publication date: November 23, 2023Inventors: Alketa Gjoka, Jad Ali Jaber, David Crespo, Saksatha Ly
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Patent number: 11618016Abstract: A polysulfone membrane is modified so that monomers are wafted onto the surface of the membrane. The polysulfone membranes can be grafted by contacting the membrane with a grafting solution and exposing the membrane to electromagnetic radiation, typically within the ultraviolet portion of the spectrum. The monomers that are grafted are typically anionic or cationic. The grafted membranes can be used for filtering impurities, such as positively and negatively charged particles, from a liquid. Anionic membranes provide improved filtration of negatively charged impurities, while cationic membranes provide improved filtration of positively charged impurities.Type: GrantFiled: October 18, 2021Date of Patent: April 4, 2023Assignee: ENTEGRIS, INC.Inventors: Jad Ali Jaber, Alketa Gjoka, Saksatha Ly
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Patent number: 11273436Abstract: A polysulfone membrane is modified so that monomers are grafted onto the surface of the membrane. The polysulfone membranes can be grafted by contacting the membrane with a grafting solution and exposing the membrane to electromagnetic radiation, typically within the ultraviolet portion of the spectrum. The monomers that are grafted are typically anionic or cationic. The grafted membranes can be used for filtering impurities, such as positively and negatively charged particles, from a liquid. Anionic membranes provide improved filtration of negatively charged impurities, while cationic membranes provide improved filtration of positively charged impurities.Type: GrantFiled: November 19, 2015Date of Patent: March 15, 2022Assignee: ENTEGRIS, INC.Inventors: Jad Ali Jaber, Alketa Gjoka, Saksatha Ly
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Publication number: 20220032282Abstract: A polysulfone membrane is modified so that monomers are wafted onto the surface of the membrane. The polysulfone membranes can be grafted by contacting the membrane with a grafting solution and exposing the membrane to electromagnetic radiation, typically within the ultraviolet portion of the spectrum. The monomers that are grafted are typically anionic or cationic. The grafted membranes can be used for filtering impurities, such as positively and negatively charged particles, from a liquid. Anionic membranes provide improved filtration of negatively charged impurities, while cationic membranes provide improved filtration of positively charged impurities.Type: ApplicationFiled: October 18, 2021Publication date: February 3, 2022Inventors: Jad Ali Jaber, Alketa Gjoka, Saksatha Ly
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Patent number: 10792620Abstract: Grafted, asymmetric, porous, ultra high molecular weight polyethylene membranes having a bubble point between about 5.38 bar (78 psi) and 11.03 bar (160 psi) are disclosed. Monomers are grafted to the porous polymeric membrane surfaces, the monomers having one or more of neutral groups or ion exchange groups grafted to one or more surfaces of the membrane. A combination of two photoinitiators can be used to graft the monomers to the asymmetric, porous, ultra high molecular weight membrane resulting in grafted microporous membranes that have water flow rates that are at least 50% of the water flow rate of an ungrafted, asymmetric, porous ultra high molecular weight polyethylene membrane. The grafted membrane also wets in water.Type: GrantFiled: November 19, 2015Date of Patent: October 6, 2020Assignee: ENTEGRIS, INC.Inventors: Jad Ali Jaber, Alketa Gjoka
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Patent number: 10179842Abstract: Microporous membrane composites that are non-dewetting are disclosed. These microporous membrane composites are wet with solutions of methanol and water and are non-dewetting following autoclave treatment in water. The microporous membrane composites comprise a microporous membrane support that is coated with a crosslinked ionomer comprising hydrophilic groups. Compared to the microporous membrane support, the microporous membrane composite has a flow loss on average in isopropyl alcohol of less than 82%.Type: GrantFiled: January 29, 2016Date of Patent: January 15, 2019Assignee: Entegris, Inc.Inventors: Alketa Gjoka, Ven Anantha Raman, Matthias Gebert, Claudio Oldani, Alessandro Ghielmi
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Publication number: 20180290109Abstract: Grafted, asymmetric, porous, ultra high molecular weight polyethylene membranes having a bubble point between about 5.38 bar (78 psi) and 11.03 bar (160 psi) are disclosed. Monomers are grafted to the porous polymeric membrane surfaces, the monomers having one or more of neutral groups or ion exchange groups grafted to one or more surfaces of the membrane. A combination of two photoinitiators can be used to graft the monomers to the asymmetric, porous, ultra high molecular weight membrane resulting in grafted microporous membranes that have water flow rates that are at least 50% of the water flow rate of an ungrafted, asymmetric, porous ultra high molecular weight polyethylene membrane. The grafted membrane also wets in water.Type: ApplicationFiled: November 19, 2015Publication date: October 11, 2018Inventors: Jad Ali JABER, Alketa GJOKA
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Publication number: 20180185835Abstract: A polysulfone membrane is modified so that monomers are grafted onto the surface of the membrane. The polysulfone membranes can be grafted by contacting the membrane with a grafting solution and exposing the membrane to electromagnetic radiation, typically within the ultraviolet portion of the spectrum. The monomers that are grafted are typically anionic or cationic. The grafted membranes can be used for filtering impurities, such as positively and negatively charged particles, from a liquid. Anionic membranes provide improved filtration of negatively charged impurities, while cationic membranes provide improved filtration of positively charged impurities.Type: ApplicationFiled: November 19, 2015Publication date: July 5, 2018Inventors: Jad Ali Jaber, Alketa Gjoka, Saksatha Ly
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Patent number: 9359480Abstract: Microporous membrane composites that are non-dewetting are disclosed. These microporous membrane composites are wet with solutions of methanol and water and are non-dewetting following autoclave treatment in water. The microporous membrane composites comprise a microporous membrane support that is coated with a crosslinked ionomer comprising hydrophilic groups. Compared to the microporous membrane support, the microporous membrane composite has a flow loss on average in isopropyl alcohol of less than 82%.Type: GrantFiled: March 31, 2010Date of Patent: June 7, 2016Assignees: Entegris, Inc., Solvay Specialty Polymers Italy S.P.A.Inventors: Alketa Gjoka, Ven Anantha Raman, Matthias Gebert, Claudio Oldani, Alessandro Ghielmi
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Publication number: 20160144322Abstract: Microporous membrane composites that are non-dewetting are disclosed. These microporous membrane composites are wet with solutions of methanol and water and are non-dewetting following autoclave treatment in water. The microporous membrane composites comprise a microporous membrane support that is coated with a crosslinked ionomer comprising hydrophilic groups. Compared to the microporous membrane support, the microporous membrane composite has a flow loss on average in isopropyl alcohol of less than 82%.Type: ApplicationFiled: January 29, 2016Publication date: May 26, 2016Inventors: ALKETA GJOKA, VEN ANANTHA RAMAN, MATTHIAS GEBERT, CLAUDIO OLDANI, ALESSANDRO GHIELMI
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Patent number: 8789708Abstract: Versions of the invention include compositions and methods for making them that include a polymeric porous membrane with one or more atmospheric pressure microwave plasma modified surfaces. The modified porous membrane is stable, non-dewetting, and retains its mechanical strength.Type: GrantFiled: October 30, 2013Date of Patent: July 29, 2014Assignee: Entegris, Inc.Inventors: Jijun Ge, Alketa Gjoka, Jieh-Hwa Shyu
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Patent number: 8668093Abstract: Versions of the invention include compositions and methods for making them that include a polymeric porous membrane with one or more atmospheric pressure microwave plasma modified surfaces. The modified porous membrane is stable, non-dewetting, and retains its mechanical strength.Type: GrantFiled: May 11, 2011Date of Patent: March 11, 2014Assignee: Entegris, Inc.Inventors: Jijun Ge, Alketa Gjoka, Jieh-Hwa Shyu
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Publication number: 20140048476Abstract: Versions of the invention include compositions and methods for making them that include a polymeric porous membrane with one or more atmospheric pressure microwave plasma modified surfaces. The modified porous membrane is stable, non-dewetting, and retains its mechanical strength.Type: ApplicationFiled: October 30, 2013Publication date: February 20, 2014Applicant: Entegris, Inc.Inventors: Jijun Ge, Alketa Gjoka, Jieh-Hwa Shyu
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Publication number: 20120118816Abstract: Microporous membrane composites that are non-dewetting are disclosed. These microporous membrane composites are wet with solutions of methanol and water and are non-dewetting following autoclave treatment in water. The microporous membrane composites comprise a microporous membrane support that is coated with a crosslinked ionomer comprising hydrophilic groups. Compared to the microporous membrane support, the microporous membrane composite has a flow loss on average in isopropyl alcohol of less than 82%.Type: ApplicationFiled: March 31, 2010Publication date: May 17, 2012Applicant: Entegris, Inc.Inventors: Alketa Gjoka, Ven Anantha Raman, Matthias Gebert, Claudio Oldani, Alessandro Ghielmi
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Publication number: 20110210063Abstract: Versions of the invention include compositions and methods for making them that include a polymeric porous membrane with one or more atmospheric pressure microwave plasma modified surfaces. The modified porous membrane is stable, non-dewetting, and retains its mechanical strength.Type: ApplicationFiled: May 11, 2011Publication date: September 1, 2011Inventors: Jijun GE, Alketa Gjoka, Jieh-Hwa Shyu
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Patent number: 7963401Abstract: Versions of the invention include compositions and methods for making them that include a polymeric porous membrane with one or more atmospheric pressure microwave plasma modified surfaces. The modified porous membrane is stable, non-dewetting, and retains its mechanical strength.Type: GrantFiled: March 28, 2007Date of Patent: June 21, 2011Assignee: Entegris, Inc.Inventors: Jijun Ge, Alketa Gjoka, Jieh-Hwa Shyu
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Publication number: 20100320142Abstract: Versions of the invention include compositions and methods for making them that include a polymeric porous membrane with one or more atmospheric pressure microwave plasma modified surfaces. The modified porous membrane is stable, non-dewetting, and retains its mechanical strength.Type: ApplicationFiled: March 28, 2007Publication date: December 23, 2010Inventors: Jijun Ge, Alketa Gjoka, Jieh-Hwa Shyu