Patents by Inventor Antal I. Jakli
Antal I. Jakli 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: 9416487Abstract: A piezoelectric device includes a fiber mat comprising polymer fibers with ferroelectric particles embedded in the polymer fibers. The ferroelectric particles are oriented to generate a net polarization in the fiber mat. The ferroelectric particles may comprise barium titanate particles. The polymer fibers may comprise polylactic acid (PLA) fibers. The piezoelectric device may further include substrates sandwiching the fiber mat, and the fiber mat may be formed by electrospinning polymer fibers containing ferroelectric particles onto one of the substrates. The piezoelectric device may be a piezoelectric actuator configured to receive an input voltage applied across the fiber mat and to output a mechanical displacement in response to the voltage, or the piezoelectric device may be configured to output a voltage in response to a mechanical force applied to the fiber mat.Type: GrantFiled: October 11, 2013Date of Patent: August 16, 2016Assignee: Kent State UniversityInventors: Antal I. Jakli, Ebru Aylin Buyuktanir, John L. West, Jason Morvan, John Ernest Harden, Jr.
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Publication number: 20150102704Abstract: A piezoelectric device includes a fiber mat comprising polymer fibers with ferroelectric particles embedded in the polymer fibers. The ferroelectric particles are oriented to generate a net polarization in the fiber mat. The ferroelectric particles may comprise barium titanate particles. The polymer fibers may comprise polylactic acid (PLA) fibers. The piezoelectric device may further include substrates sandwiching the fiber mat, and the fiber mat may be formed by electrospinning polymer fibers containing ferroelectric particles onto one of the substrates. The piezoelectric device may be a piezoelectric actuator configured to receive an input voltage applied across the fiber mat and to output a mechanical displacement in response to the voltage, or the piezoelectric device may be configured to output a voltage in response to a mechanical force applied to the fiber mat.Type: ApplicationFiled: October 11, 2013Publication date: April 16, 2015Applicant: KENT STATE UNIVERSITYInventors: Antal I. Jakli, Ebru Aylin Buyuktanir, John L. West, Jason Morvan, John Ernest Harden, JR.
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Patent number: 8595923Abstract: There are provided methods for creating energy conversion devices based on the giant flexoelectric effect in non-calamitic liquid crystals. By preparing a substance comprising at least one type of non-calamitic liquid crystal molecules and stabilizing the substance to form a mechanically flexible material, flexible conductive electrodes may be applied to the material to create an electro-mechanical energy conversion device which relies on the giant flexoelectric effect to produce electrical and/or mechanical energy that is usable in such applications as, for example, power sources, energy dissipation, sensors/transducers, and actuators.Type: GrantFiled: March 19, 2010Date of Patent: December 3, 2013Assignee: Kent State UniversityInventors: Antal I. Jakli, John Ernest Harden, Jr., Samuel Sprunt, James T. Gleeson, Peter Palffy-Muhoray
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Patent number: 8035279Abstract: There are provided methods for creating energy conversion devices based on the giant flexoelectric effect in non-calamitic liquid crystals. By preparing a substance comprising at least one type of non-calamitic liquid crystal molecules and stabilizing the substance to form a mechanically flexible material, flexible conductive electrodes may be applied to the material to create an electro-mechanical energy conversion device which relies on the giant flexoelectric effect to produce electrical and/or mechanical energy that is usable in such applications as, for example, power sources, energy dissipation, sensors/transducers, and actuators.Type: GrantFiled: March 19, 2010Date of Patent: October 11, 2011Assignee: Kent State UniversityInventors: Antal I. Jakli, John Ernest Harden, Jr., Samuel Sprunt, James T. Gleeson, Peter Palffy-Muhoray
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Patent number: 7832093Abstract: There are provided methods for creating energy conversion devices based on the giant flexoelectric effect in non-calamitic liquid crystals. By preparing a substance comprising at least one type of non-calamitic liquid crystal molecules and stabilizing the substance to form a mechanically flexible material, flexible conductive electrodes may be applied to the material to create an electro-mechanical energy conversion device which relies on the giant flexoelectric effect to produce electrical and/or mechanical energy that is usable in such applications as, for example, power sources, energy dissipation, sensors/transducers, and actuators.Type: GrantFiled: June 11, 2007Date of Patent: November 16, 2010Assignee: Kent State UniversityInventors: Antal I. Jakli, John Ernest Harden, Jr., Samuel Sprunt, James T. Gleeson, Peter Palffy-Muhoray
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Patent number: 7782438Abstract: The invention is directed to liquid crystal display and electro-optical devices having faster switching times, a wider viewing angle, continuous gray level, improved transmittance of the clear state, approximately no threshold voltage and low power consumption. The aspects of the invention are achieved by a liquid crystal device comprising an orthogonal nematic, smectic or columnar liquid crystal phase, which is uniaxial in absence of electric field, but becomes biaxial when electric field is applied normal to the director (in between electrodes for planar alignment, or in-plane electric field in case of homeotropic alignment). This electric field induced biaxiality (EFIB) mode is provided using any dielectric orthogonal nematic, smectic or columnar bent-core liquid crystal phase. The nature of the switching is dielectric (not piezoelectric) and does not involve variation of layer spacing variation, so as to be mechanically much more stable than prior systems.Type: GrantFiled: June 13, 2007Date of Patent: August 24, 2010Assignee: Kent State UniversityInventor: Antal I. Jakli
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Publication number: 20100207493Abstract: There are provided methods for creating energy conversion devices based on the giant flexoelectric effect in non-calamitic liquid crystals. By preparing a substance comprising at least one type of non-calamitic liquid crystal molecules and stabilizing the substance to form a mechanically flexible material, flexible conductive electrodes may be applied to the material to create an electro-mechanical energy conversion device which relies on the giant flexoelectric effect to produce electrical and/or mechanical energy that is usable in such applications as, for example, power sources, energy dissipation, sensors/transducers, and actuators.Type: ApplicationFiled: March 19, 2010Publication date: August 19, 2010Applicant: KENT STATE UNIVERSITYInventors: Antal I. Jakli, John Ernest Harden, JR., Samuel Sprunt, James T. Gleeson
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Publication number: 20100182026Abstract: There are provided methods for creating energy conversion devices based on the giant flexoelectric effect in non-calamitic liquid crystals. By preparing a substance comprising at least one type of non-calamitic liquid crystal molecules and stabilizing the substance to form a mechanically flexible material, flexible conductive electrodes may be applied to the material to create an electro-mechanical energy conversion device which relies on the giant flexoelectric effect to produce electrical and/or mechanical energy that is usable in such applications as, for example, power sources, energy dissipation, sensors/transducers, and actuators.Type: ApplicationFiled: March 19, 2010Publication date: July 22, 2010Applicant: KENT STATE UNIVERSITYInventors: Antal I. Jakli, John Ernest Harden, JR., Samuel Sprunt, James T. Gleeson
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Publication number: 20080303376Abstract: Devices and methods for energy conversion based on the giant flexoelectric effect in non-calamitic liquid crystals. By preparing a substance comprising at least one type of non-calamitic liquid crystal molecules and stabilizing the substance to form a mechanically flexible material, flexible conductive electrodes may be applied to the material to create an electro-mechanical energy conversion device which relies on the giant flexoelectric effect to produce electrical and/or mechanical energy that is usable in such applications as, for example, power sources, energy dissipation, sensors/transducers, and actuators. The ability to directly and accurately measure the giant flexoelectric effect for different types of non-calamitic liquid crystal molecules is important for identifying molecules that may be effective for particular applications.Type: ApplicationFiled: June 11, 2007Publication date: December 11, 2008Applicant: KENT STATE UNIVERSITYInventors: Antal I. JAKLI, John Ernest HARDEN, Jr., Samuel SPRUNT, James T. GLEESON
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Publication number: 20080002121Abstract: The invention is directed to liquid crystal display and electro-optical devices having faster switching times, a wider viewing angle, continuous gray level, improved transmittance of the clear state, approximately no threshold voltage and low power consumption. The aspects of the invention are achieved by a liquid crystal device comprising an orthogonal nematic, smectic or columnar liquid crystal phase, which is uniaxial in absence of electric field, but becomes biaxial when electric field is applied normal to the director (in between electrodes for planar alignment, or in-plane electric field in case of homeotropic alignment). This electric field induced biaxiality (EFIB) mode is provided using any dielectric orthogonal nematic, smectic or columnar bent-core liquid crystal phase. The nature of the switching is dielectric (not piezoelectric) and does not involve variation of layer spacing variation, so as to be mechanically much more stable than prior systems.Type: ApplicationFiled: June 13, 2007Publication date: January 3, 2008Applicant: KENT STATE UNIVERSITYInventor: Antal I. Jakli