Patents by Inventor Qibing Pei
Qibing Pei 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: 8237324Abstract: A bistable electroactive polymer transducer is provided for electrically actuated deformation of rigid electroactive polymer members. The polymers have glass transition temperatures (Tg) above ambient conditions and turn into rubbery elastomers above Tg and have high dielectric breakdown strength in the rubbery state. They can be electrically deformed to various rigid shapes with maximum strain greater than 100% and as high as 400%. The actuation is made bistable by cooling below Tg to preserve the deformation. The dielectric actuation mechanism includes a pair of compliant electrodes in contact with a dielectric elastomer which deforms when a voltage bias is applied between the pair of electrodes. In some of the configurations, the dielectric elastomer is also a shape memory polymer. The deformations of such bistable electroactive polymers can be repeated rapidly for numerous cycles.Type: GrantFiled: December 10, 2009Date of Patent: August 7, 2012Assignee: The Regents of the University of CaliforniaInventors: Qibing Pei, Zhibin Yu
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Publication number: 20120169184Abstract: Described herein are transducers and their fabrication. The transducers convert between mechanical and electrical energy. Some transducers of the present invention include a pre-strained polymer. The pre-strain improves the conversion between electrical and mechanical energy. The present invention provides methods for fabricating electromechanical devices including one or more electroactive polymers.Type: ApplicationFiled: February 1, 2012Publication date: July 5, 2012Applicant: Bayer MaterialScience AGInventors: Ronald E. Pelrine, Roy D. Kornbluth, Qibing Pei, Seajin Oh, Jose P. Joseph
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Patent number: 8093783Abstract: The invention describes rolled electroactive polymer devices. The invention also describes employment of these devices in a wide array of applications and methods for their fabrication. A rolled electroactive polymer device converts between electrical and mechanical energy; and includes a rolled electroactive polymer and at least two electrodes to provide the mechanical/electrical energy conversion. Prestrain is typically applied to the polymer. In one embodiment, a rolled electroactive polymer device employs a mechanism, such as a spring, that provides a force to prestrain the polymer. Since prestrain improves mechanical/electrical energy conversion for many electroactive polymers, the mechanism thus improves performance of the rolled electroactive polymer device.Type: GrantFiled: May 24, 2010Date of Patent: January 10, 2012Assignee: SRI InternationalInventors: Marcus A. Rosenthal, Qibing Pei, Neville A. Bonwit
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Patent number: 8042264Abstract: The invention describes rolled electroactive polymer devices. The invention also describes employment of these devices in a wide array of applications and methods for their fabrication. A rolled electroactive polymer device converts between electrical and mechanical energy; and includes a rolled electroactive polymer and at least two electrodes to provide the mechanical/electrical energy conversion. Prestrain is typically applied to the polymer. In one embodiment, a rolled electroactive polymer device employs a mechanism, such as a spring, that provides a force to prestrain the polymer. Since prestrain improves mechanical/electrical energy conversion for many electroactive polymers, the mechanism thus improves performance of the rolled electroactive polymer device.Type: GrantFiled: June 30, 2010Date of Patent: October 25, 2011Assignee: SRI InternationalInventors: Marcus A. Rosenthal, Qibing Pei, Neville A. Bonwit
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Publication number: 20110209337Abstract: The present invention provides electroactive polymers, transducers and devices that maintain pre-strain in one or more portions of an electroactive polymer. Electroactive polymers described herein may include a pre-strained portion and a stiffened portion configured to maintain pre-strain in the pre-strained portion. One fabrication technique applies pre-strain to a partially cured electroactive polymer. The partially cured polymer is then further cured to stiffen and maintain the pre-strain. In another fabrication technique, a support layer is coupled to the polymer that maintains pre-strain in a portion of an electroactive polymer. Another embodiment of the invention cures a polymer precursor to maintain pre-strain in an electroactive polymer.Type: ApplicationFiled: March 9, 2011Publication date: September 1, 2011Applicant: Bayer MaterialScience AGInventors: QIBING PEI, Ronald E. Pelrine, Marcus Rosenthal
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Publication number: 20110155307Abstract: Described herein are transducers and their fabrication. The transducers convert between mechanical and electrical energy. Some transducers of the present invention include a pre-strained polymer. The pre-strain improves the conversion between electrical and mechanical energy. The present invention provides methods for fabricating electromechanical devices including one or more electroactive polymers.Type: ApplicationFiled: March 18, 2011Publication date: June 30, 2011Applicant: SRI InternationalInventors: Ronald E. Pelrine, Roy D. Kornbluh, Qibing Pei, Seajin Oh, Jose P. Joseph
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Patent number: 7939900Abstract: Polymerizable anions and/or cations can be used as the ionically conductive species for the formation of a p-i-n junction in conjugated polymer thin films. After the junction is formed, the ions are polymerized in situ, and the junction is locked thereafter. The resulting polymer p-i-n junction diodes could have a high current rectification ratio. Electroluminescence with high quantum efficiency and low operating voltage may be produced from this locked junction. The diodes may also be used for photovoltaic energy conversion. In a photovoltaic cell, the built-in potential helps separate electron-hole pairs and increases the open-circuit voltage.Type: GrantFiled: March 4, 2008Date of Patent: May 10, 2011Assignee: The Regents of the University of CaliforniaInventor: Qibing Pei
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Patent number: 7921541Abstract: The present invention provides electroactive polymers, transducers and devices that maintain pre-strain in one or more portions of an electroactive polymer. Electroactive polymers described herein may include a pre-strained portion and a stiffened portion configured to maintain pre-strain in the pre-strained portion. One fabrication technique applies pre-strain to a partially cured electroactive polymer. The partially cured polymer is then further cured to stiffen and maintain the pre-strain. In another fabrication technique, a support layer is coupled to the polymer that maintains pre-strain in a portion of an electroactive polymer. Another embodiment of the invention cures a polymer precursor to maintain pre-strain in an electroactive polymer.Type: GrantFiled: July 29, 2007Date of Patent: April 12, 2011Assignee: SRI InternationalInventors: Qibing Pei, Ronald E. Pelrine, Marcus Rosenthal
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Patent number: 7923064Abstract: Described herein are transducers and their fabrication. The transducers convert between mechanical and electrical energy. Some transducers of the present invention include a pre-strained polymer. The pre-strain improves the conversion between electrical and mechanical energy. The present invention provides methods for fabricating electromechanical devices including one or more electroactive polymers.Type: GrantFiled: July 9, 2007Date of Patent: April 12, 2011Assignee: SRI InternationalInventors: Ronald E. Pelrine, Roy D. Kornbluh, Qibing Pei, Seajin Oh, Jose P. Joseph
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Patent number: 7911115Abstract: The present invention relates to polymers, transducers and devices that convert between electrical and mechanical energy. When a voltage is applied to electrodes contacting an electroactive polymer, the polymer deflects. This deflection may be used to do mechanical work. Similarly, when the electroactive polymer deflects, an electric field is produced in the polymer. This electric field may be used to produce electrical energy. An active area is a portion of a polymer having sufficient electrostatic force to enable deflection of the portion and/or sufficient deflection to enable a change in electrostatic force. The present invention relates to transducers and devices including multiple active areas. The invention also relates to methods for actuating one or more active areas.Type: GrantFiled: July 12, 2007Date of Patent: March 22, 2011Assignee: SRI InternationalInventors: Ronald E. Pelrine, Roy D. Kornbluh, Qibing Pei, Joseph S. Eckerle
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Publication number: 20110025170Abstract: The invention describes rolled electroactive polymer devices. The invention also describes employment of these devices in a wide array of applications and methods for their fabrication. A rolled electroactive polymer device converts between electrical and mechanical energy; and includes a rolled electroactive polymer and at least two electrodes to provide the mechanical/electrical energy conversion. Prestrain is typically applied to the polymer. In one embodiment, a rolled electroactive polymer device employs a mechanism, such as a spring, that provides a force to prestrain the polymer. Since prestrain improves mechanical/electrical energy conversion for many electroactive polymers, the mechanism thus improves performance of the rolled electroactive polymer device.Type: ApplicationFiled: May 24, 2010Publication date: February 3, 2011Applicant: SRI INTERNATIONALInventors: Marcus A. ROSENTHAL, Qibing PEI, Neville A. BONWIT
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Publication number: 20100263181Abstract: The invention describes rolled electroactive polymer devices. The invention also describes employment of these devices in a wide array of applications and methods for their fabrication. A rolled electroactive polymer device converts between electrical and mechanical energy; and includes a rolled electroactive polymer and at least two electrodes to provide the mechanical/electrical energy conversion. Prestrain is typically applied to the polymer. In one embodiment, a rolled electroactive polymer device employs a mechanism, such as a spring, that provides a force to prestrain the polymer. Since prestrain improves mechanical/electrical energy conversion for many electroactive polymers, the mechanism thus improves performance of the rolled electroactive polymer device.Type: ApplicationFiled: June 30, 2010Publication date: October 21, 2010Applicant: SRI INTERNATIONALInventors: Marcus A. Rosenthal, Qibing Pei, Neville A. Bonwit
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Patent number: 7785656Abstract: The present invention provides electroactive polymers, transducers and devices that maintain pre-strain in one or more portions of an electroactive polymer. Electroactive polymers described herein may include a pre-strained portion and a stiffened portion configured to maintain pre-strain in the pre-strained portion. One fabrication technique applies pre-strain to a partially cured electroactive polymer. The partially cured polymer is then further cured to stiffen and maintain the pre-strain. In another fabrication technique, a support layer is coupled to the polymer that maintains pre-strain in a portion of an electroactive polymer. Another embodiment of the invention cures a polymer precursor to maintain pre-strain in an electroactive polymer.Type: GrantFiled: August 19, 2008Date of Patent: August 31, 2010Assignee: SRI InternationalInventors: Qibing Pei, Ronald E. Pelrine, Marcus Rosenthal
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Patent number: 7761981Abstract: The invention describes rolled electroactive polymer devices. The invention also describes employment of these devices in a wide array of applications and methods for their fabrication. A rolled electroactive polymer device converts between electrical and mechanical energy; and includes a rolled electroactive polymer and at least two electrodes to provide the mechanical/electrical energy conversion. Prestrain is typically applied to the polymer. In one embodiment, a rolled electroactive polymer device employs a mechanism, such as a spring, that provides a force to prestrain the polymer. Since prestrain improves mechanical/electrical energy conversion for many electroactive polymers, the mechanism thus improves performance of the rolled electroactive polymer device.Type: GrantFiled: April 3, 2007Date of Patent: July 27, 2010Assignee: SRI InternationalInventors: Marcus A. Rosenthal, Qibing Pei, Neville A. Bonwit
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Publication number: 20100171393Abstract: A bistable electroactive polymer transducer is provided for electrically actuated deformation of rigid electroactive polymer members. The polymers have glass transition temperatures (Tg) above ambient conditions and turn into rubbery elastomers above Tg and have high dielectric breakdown strength in the rubbery state. They can be electrically deformed to various rigid shapes with maximum strain greater than 100% and as high as 400%. The actuation is made bistable by cooling below Tg to preserve the deformation. The dielectric actuation mechanism includes a pair of compliant electrodes in contact with a dielectric elastomer which deforms when a voltage bias is applied between the pair of electrodes. In some of the transducers of the present invention, the dielectric elastomer is also a shape memory polymer. The deformations of such bistable electroactive polymers can be repeated rapidly for numerous cycles.Type: ApplicationFiled: December 10, 2009Publication date: July 8, 2010Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIAInventors: Qibing Pei, Zhibin Yu
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Publication number: 20100024180Abstract: The present invention provides electroactive polymers, transducers and devices that maintain pre-strain in one or more portions of an electroactive polymer. Electroactive polymers described herein may include a pre-strained portion and a stiffened portion configured to maintain pre-strain in the pre-strained portion. One fabrication technique applies pre-strain to a partially cured electroactive polymer. The partially cured polymer is then further cured to stiffen and maintain the pre-strain. In another fabrication technique, a support layer is coupled to the polymer that maintains pre-strain in a portion of an electroactive polymer. Another embodiment of the invention cures a polymer precursor to maintain pre-strain in an electroactive polymer.Type: ApplicationFiled: July 29, 2007Publication date: February 4, 2010Applicant: SRI INTERNATIONALInventors: Qibing Pei, Ronald E. Pelrine, Marcus Rosenthal
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Publication number: 20100026143Abstract: The present invention relates to polymers, transducers and devices that convert between electrical and mechanical energy. When a voltage is applied to electrodes contacting an electroactive polymer, the polymer deflects. This deflection may be used to do mechanical work. Similarly, when the electroactive polymer deflects, an electric field is produced in the polymer. This electric field may be used to produce electrical energy. An active area is a portion of a polymer having sufficient electrostatic force to enable deflection of the portion and/or sufficient deflection to enable a change in electrostatic force. The present invention relates to transducers and devices including multiple active areas. The invention also relates to methods for actuating one or more active areas.Type: ApplicationFiled: July 12, 2007Publication date: February 4, 2010Applicant: SRI INTERNATIONALInventors: Ronald E. Pelrine, Roy D. Kornbluh, Qibing Pei, Joseph S. Eckerle
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Publication number: 20090184606Abstract: The invention describes electroactive polymer devices in both rolled and unrolled configurations. The invention also describes employment of these devices in a wide array of applications and methods for their fabrication. An electroactive polymer device converts between electrical and mechanical energy; and, in one embodiment includes a rolled electroactive polymer and one or more electrodes to provide the mechanical/electrical energy conversion. In one embodiment, the electroactive polymer has a non-uniform surface on which an electrode having a non-uniform shape is disposed.Type: ApplicationFiled: March 26, 2009Publication date: July 23, 2009Applicant: SRI INTERNATIONALInventors: Marcus A. Rosenthal, Qibing Pei, Neville A. Bonwit
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Publication number: 20090095343Abstract: The synthesis, characterization, optical and electrochemical properties of a regioregular copolymer, poly(3-octylthiophene-2,5-diyl-co-3-decyloxythiophene-2,5-diyl) (POT-co-DOT), and an alternating regioregular copolymer poly{(9,9-dioctylfluorene)-2,7-diyl-alt-[4,7-bis(3-decyloxythien-2-yl)-2,1,3-benzothiadiazole]-5?,5?-diyl} (PF-co-DTB) is disclosed. The incorporation of 3-alkoxythiophene units onto the conjugated backbones enhances the electron-donating property of the polymer and lowers its bandgap. The fabrication and performance of photovoltaic cells with bulk heterojunction architecture based on blends of these copolymers with PCBM are also described.Type: ApplicationFiled: September 15, 2008Publication date: April 16, 2009Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIAInventors: Qibing Pei, Yang Yang, Chenjun Shi
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Patent number: 7468575Abstract: Described herein are transducers, their use and fabrication. The transducers convert between mechanical and electrical energy. The present invention further relates to compliant electrodes that conform to the shape of a polymer included in a transducer.Type: GrantFiled: July 9, 2007Date of Patent: December 23, 2008Assignee: SRI InternationalInventors: Ronald E. Pelrine, Roy D. Kornbluh, Qibing Pei, Jose P. Joseph