Patents Assigned to Ohio Aerospace Institute
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Patent number: 10546666Abstract: A thin micro-multilayer electrical insulator having a plurality of layers of polymeric materials is high performance and lightweight. The insulator provides a structured material with improved dielectric strength and partial corona discharge resistance that can be used in high voltage and high temperature applications. The durable insulator is well suited for use in insulating high voltage aircraft wiring and power transmission composites in hybrid and all electric airplanes. The insulator can have multiple layers of different polymeric materials such as fluorine-containing polymers and polyimides.Type: GrantFiled: April 11, 2019Date of Patent: January 28, 2020Assignees: OHIO AEROSPACE INSTITUTE, U.S. GOVERNMENT AS REPRESENTED BY THE ADMINISTRATOR OF THE NATIONAL AERONAUTICS AND SPACE ADMINISTRATIONInventor: Euy-sik Shin
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Patent number: 10428181Abstract: Porous cross-linked partially aliphatic polyimide networks are provided. The polyimide networks comprise a polyamic acid oligomer that (i) comprises a repeating unit of a dianhydride and a diamine and terminal functional groups, (ii) has an average degree of polymerization of 10 to 70, (iii) has been cross-linked via a cross-linking agent, comprising three or more cross-linking groups, at a balanced stoichiometry of the cross-linking groups to the terminal functional groups, and (iv) has been chemically imidized to yield the porous cross-linked polyimide network. The polyimide networks are partially aliphatic based on (a) the diamine comprising a first diamine and a second diamine, wherein the first diamine comprises a linear aliphatic backbone chain, and the second diamine does not, and/or (b) the dianhydride comprising a first dianhydride and a second dianhydride, wherein the first dianhydride comprises a linear aliphatic backbone chain, and the second dianhydride does not.Type: GrantFiled: October 11, 2017Date of Patent: October 1, 2019Assignees: OHIO AEROSPACE INSTITUTE, U.S. GOVERNMENT AS REPRESENTED BY THE ADMINISTRATOR OF THE NATIONAL AERONAUTICS AND SPACE ADMINISTRATIONInventors: Mary Ann B. Meador, Baochau N. Nguyen, Haiquan Guo
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Patent number: 9109088Abstract: Porous cross-linked polyimide networks are provided. The networks comprise an anhydride end-capped polyamic acid oligomer. The oligomer (i) comprises a repeating unit of a dianhydride and a diamine and terminal anhydride groups, (ii) has an average degree of polymerization of 10 to 50, (iii) has been cross-linked via a cross-linking agent, comprising three or more amine groups, at a balanced stoichiometry of the amine groups to the terminal anhydride groups, and (iv) has been chemically imidized to yield the porous cross-linked polyimide network. Also provided are porous cross-linked polyimide aerogels comprising a cross-linked and imidized anhydride end-capped polyamic acid oligomer, wherein the oligomer comprises a repeating unit of a dianhydride and a diamine, and the aerogel has a density of 0.10 to 0.333 g/cm3 and a Young's modulus of 1.7 to 102 MPa. Also provided are thin films comprising aerogels, and methods of making porous cross-linked polyimide networks.Type: GrantFiled: February 1, 2013Date of Patent: August 18, 2015Assignees: OHIO AEROSPACE INSTITUTE, THE UNITED STATES OF AMERICA AS REPRESENTED BY THE ADMINISTRATOR OF THE NATIONAL AERONAUTICS AND SPACE ADMINISTRATIONInventors: Mary Ann B. Meador, Haiquan Guo
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Publication number: 20150141544Abstract: Porous cross-linked polyimide networks are provided. The networks comprise an anhydride end-capped polyamic acid oligomer. The oligomer (i) comprises a repeating unit of a dianhydride and a diamine and terminal anhydride groups, (ii) has an average degree of polymerization of 10 to 50, (iii) has been cross-linked via a cross-linking agent, comprising three or more amine groups, at a balanced stoichiometry of the amine groups to the terminal anhydride groups, and (iv) has been chemically imidized to yield the porous cross-linked polyimide network. Also provided are porous cross-linked polyimide aerogels comprising a cross-linked and imidized anhydride end-capped polyamic acid oligomer, wherein the oligomer comprises a repeating unit of a dianhydride and a diamine, and the aerogel has a density of 0.10 to 0.333 g/cm3 and a Young's modulus of 1.7 to 102 MPa. Also provided are thin films comprising aerogels, and methods of making porous cross-linked polyimide networks.Type: ApplicationFiled: February 1, 2013Publication date: May 21, 2015Applicants: U.S. Government as represented by the Administrator of the National Aeronautics and Spac, OHIO AEROSPACE INSTITUTEInventors: OHIO AEROSPACE INSTITUTE, U.S. Government as represented by the Administrator of the National Aeronautics and Spa
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Patent number: 8974903Abstract: Porous cross-linked polyimide-urea networks are provided. The networks comprise a subunit comprising two anhydride end-capped polyamic acid oligomers in direct connection via a urea linkage. The oligomers (a) each comprise a repeating unit of a dianhydride and a diamine and a terminal anhydride group and (b) are formulated with 2 to 15 of the repeating units. The subunit was formed by reaction of the diamine and a diisocyanate to form a diamine-urea linkage-diamine group, followed by reaction of the diamine-urea linkage-diamine group with the dianhydride and the diamine to form the subunit. The subunit has been cross-linked via a cross-linking agent, comprising three or more amine groups, at a balanced stoichiometry of the amine groups to the terminal anhydride groups. The subunit has been chemically imidized to yield the porous cross-linked polyimide-urea network. Also provided are wet gels, aerogels, and thin films comprising the networks, and methods of making the networks.Type: GrantFiled: March 14, 2013Date of Patent: March 10, 2015Assignees: Ohio Aerospace Institute, The United States of America, represented by the Administrator of the National Aeronautics and Space AdministrationInventors: Mary Ann B. Meador, Baochau N. Nguyen
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Publication number: 20140272358Abstract: Porous cross-linked polyimide-urea networks are provided. The networks comprise a subunit comprising two anhydride end-capped polyamic acid oligomers in direct connection via a urea linkage. The oligomers (a) each comprise a repeating unit of a dianhydride and a diamine and a terminal anhydride group and (b) are formulated with 2 to 15 of the repeating units. The subunit was formed by reaction of the diamine and a diisocyanate to form a diamine-urea linkage-diamine group, followed by reaction of the diamine-urea linkage-diamine group with the dianhydride and the diamine to form the subunit. The subunit has been cross-linked via a cross-linking agent, comprising three or more amine groups, at a balanced stoichiometry of the amine groups to the terminal anhydride groups. The subunit has been chemically imidized to yield the porous cross-linked polyimide-urea network. Also provided are wet gels, aerogels, and thin films comprising the networks, and methods of making the networks.Type: ApplicationFiled: March 14, 2013Publication date: September 18, 2014Applicant: OHIO AEROSPACE INSTITUTEInventors: Mary Ann B. Meador, Baochau N. Nguyen
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Patent number: 8258251Abstract: Ceramic oxide aerogels having improved flexibility are disclosed. Preferred embodiments exhibit high modulus and other strength properties despite their improved flexibility. The gels may be polymer cross-linked via organic polymer chains to further improve strength properties, without substantially detracting from the improved flexibility. Methods of making such aerogels are also disclosed.Type: GrantFiled: May 7, 2010Date of Patent: September 4, 2012Assignees: The United States of America, as represented by the Administrator of the National Aeronautics and Space Administration, Ohio Aerospace InstituteInventors: Mary Ann B. Meador, Baochau N. Nguyen, Haiquan Guo
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Patent number: 8242162Abstract: Aromatic molecules that can be used as sensors are described. The aromatic sensors include a polycyclic aromatic hydrocarbon core with a five-membered imide rings fused to the core and at least two pendant aryl groups. The aromatic sensor molecules can detect target analytes or molecular strain as a result of changes in their fluorescence, in many cases with on-off behavior. Aromatic molecules that fluoresce at various frequencies can be prepared by altering the structure of the aromatic core or the substituents attached to it. The aromatic molecules can be used as sensors for various applications such as, for example, the detection of dangerous chemicals, biomedical diagnosis, and the detection of damage or strain in composite materials. Methods of preparing aromatic sensor molecules are also described.Type: GrantFiled: December 14, 2007Date of Patent: August 14, 2012Assignees: Ohio Aerospace Institute, The United States of America as represented by the Administrator of the National Aeronautics and Space AdministrationInventors: Michael A. Meador, Daniel S. Tyson, Ulvi F. Ilan
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Patent number: 8227363Abstract: Structurally stable and mechanically strong ceramic oxide aerogels are provided. The aerogels are cross-linked via organic polymer chains that are attached to and extend from surface-bound functional groups provided or present over the internal surfaces of a mesoporous ceramic oxide particle network via appropriate chemical reactions. The functional groups can be hydroxyl groups, which are native to ceramic oxides, or they can be non-hydroxyl functional groups that can be decorated over the internal surfaces of the ceramic oxide network. Methods of preparing such mechanically strong ceramic oxide aerogels also are provided.Type: GrantFiled: February 8, 2010Date of Patent: July 24, 2012Assignees: Ohio Aerospace Institute, The United States of America as represented by the Administrator of National Aeronautics and Space AdministrationInventors: Nicholas Leventis, Mary Ann B. Meador, James C. Johnston, Eve F. Fabrizio, Ulvi F. Ilhan
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Publication number: 20100292428Abstract: Ceramic oxide aerogels having improved flexibility are disclosed. Preferred embodiments exhibit high modulus and other strength properties despite their improved flexibility. The gels may be polymer cross-linked via organic polymer chains to further improve strength properties, without substantially detracting from the improved flexibility. Methods of making such aerogels are also disclosed.Type: ApplicationFiled: May 7, 2010Publication date: November 18, 2010Applicants: OHIO AEROSPACE INSTITUTE, U.S. Government, represented by the Administrator of the National Aeronautics and Space AdministratiInventors: Mary Ann B. Meador, Baochau N. Nguyen, Haiquan Guo
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Publication number: 20100179288Abstract: Structurally stable and mechanically strong ceramic oxide aerogels are provided. The aerogels are cross-linked via organic polymer chains that are attached to and extend from surface-bound functional groups provided or present over the internal surfaces of a mesoporous ceramic oxide particle network via appropriate chemical reactions. The functional groups can be hydroxyl groups, which are native to ceramic oxides, or they can be non-hydroxyl functional groups that can be decorated over the internal surfaces of the ceramic oxide network. Methods of preparing such mechanically strong ceramic oxide aerogels also are provided.Type: ApplicationFiled: February 8, 2010Publication date: July 15, 2010Applicants: Ohio Aerospace Institute, U.S. Government, represented by the Administrator of the National Aeronautics & Space AdministrationInventors: Nicholas Leventis, Mary Ann B. Meador, James C. Johnston, Eve F. Fabrizio, Ulvi F. Ilhan
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Patent number: 7732496Abstract: Structurally stable and mechanically strong ceramic oxide aerogels are provided. The aerogels are cross-linked via organic polymer chains that are attached to and extend from surface-bound functional groups provided or present over the internal surfaces of a mesoporous ceramic oxide particle network via appropriate chemical reactions. The functional groups can be hydroxyl groups, which are native to ceramic oxides, or they can be non-hydroxyl functional groups that can be decorated over the internal surfaces of the ceramic oxide network. Methods of preparing such mechanically strong ceramic oxide aerogels also are provided.Type: GrantFiled: November 3, 2005Date of Patent: June 8, 2010Assignees: Ohio Aerospace Institute, The United States of America as represented by the Administrator of the National Aeronautics and Space AdministrationInventors: Nicholas Leventis, Mary Ann B. Meador, James C. Johnston, Eve F. Fabrizio, Ulvi F. Ilhan
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Patent number: 7718283Abstract: An alpha voltaic battery includes at least one layer of a semiconductor material comprising at least one p/n junction, at least one absorption and conversion layer on the at least one layer of semiconductor layer, and at least one alpha particle emitter. The absorption and conversion layer prevents at least a portion of alpha particles from the alpha particle emitter from damaging the p/n junction in the layer of semiconductor material. The absorption and conversion layer also converts at least a portion of energy from the alpha particles into electron-hole pairs for collection by the one p/n junction in the layer of semiconductor material.Type: GrantFiled: August 22, 2008Date of Patent: May 18, 2010Assignees: Rochester Institute of Technology, Glenn Research Center, Ohio Aerospace InstituteInventors: Ryne P. Raffaelle, Phillip Jenkins, David Wilt, David Scheiman, Donald Chubb, Stephanie Castro
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Publication number: 20080318357Abstract: An alpha voltaic battery includes at least one layer of a semiconductor material comprising at least one p/n junction, at least one absorption and conversion layer on the at least one layer of semiconductor layer, and at least one alpha particle emitter. The absorption and conversion layer prevents at least a portion of alpha particles from the alpha particle emitter from damaging the p/n junction in the layer of semiconductor material. The absorption and conversion layer also converts at least a portion of energy from the alpha particles into electron-hole pairs for collection by the one p/n junction in the layer of semiconductor material.Type: ApplicationFiled: August 22, 2008Publication date: December 25, 2008Applicants: ROCHESTER INSTITUTE OF TECHNOLOGY, GLENN RESEARCH CENTER, OHIO AEROSPACE INSTITUTEInventors: Ryne P. Raffaelle, Phillip Jenkins, David Wilt, David Scheiman, Donald Chubb, Stephanie Castro
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Publication number: 20080311465Abstract: An alpha voltaic battery includes at least one layer of a semiconductor material comprising at least one p/n junction, at least one absorption and conversion layer on the at least one layer of semiconductor layer, and at least one alpha particle emitter. The absorption and conversion layer prevents at least a portion of alpha particles from the alpha particle emitter from damaging the p/n junction in the layer of semiconductor material. The absorption and conversion layer also converts at least a portion of energy from the alpha particles into electron-hole pairs for collection by the one p/n junction in the layer of semiconductor material.Type: ApplicationFiled: August 22, 2008Publication date: December 18, 2008Applicants: ROCHESTER INSTITUTE OF TECHNOLOGY, GLENN RESEARCH CENTER, OHIO AEROSPACE INSTITUTEInventors: Ryne P. Raffaelle, Phillip Jenkins, David Wilt, David Scheiman, Donald Chubb, Stephanie Castro
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Patent number: 7449065Abstract: A method and the benefits resulting from the product thereof are disclosed for the growth of large, low-defect single-crystals of tetrahedrally-bonded crystal materials. The process utilizes a uniquely designed crystal shape whereby the direction of rapid growth is parallel to a preferred crystal direction. By establishing several regions of growth, a large single crystal that is largely defect-free can be grown at high growth rates. This process is particularly suitable for producing products for wide-bandgap semiconductors, such as SiC, GaN, AlN, and diamond. Large low-defect single crystals of these semiconductors enable greatly enhanced performance and reliability for applications involving high power, high voltage, and/or high temperature operating conditions.Type: GrantFiled: December 2, 2006Date of Patent: November 11, 2008Assignee: Ohio Aerospace InstituteInventors: J. Anthony Powell, Philip G. Neudeck, Andrew J. Trunek, David J. Spry
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Publication number: 20080242870Abstract: Aromatic molecules that can be used as sensors are described. The aromatic sensors include a polycyclic aromatic hydrocarbon core with a five-membered imide rings fused to the core and at least two pendant aryl groups. The aromatic sensor molecules can detect target analytes or molecular strain as a result of changes in their fluorescence, in many cases with on-off behavior. Aromatic molecules that fluoresce at various frequencies can be prepared by altering the structure of the aromatic core or the substituents attached to it. The aromatic molecules can be used as sensors for various applications such as, for example, the detection of dangerous chemicals, biomedical diagnosis, and the detection of damage or strain in composite materials. Methods of preparing aromatic sensor molecules are also described.Type: ApplicationFiled: December 14, 2007Publication date: October 2, 2008Applicant: Ohio Aerospace InstituteInventors: Michael A. Meador, Daniel S. Tyson, Ulvi F. IIan
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Patent number: 7186466Abstract: A thermal barrier coating composition is provided. The composition has a base oxide, a primary stabilizer, and at least two additional cationic oxide dopants. Preferably, a pair of group A and group B defect cluster-promoting oxides is used in conjunction with the base and primary stabilizer oxides. The new thermal barrier coating is found to have significantly lower thermal conductivity and better sintering resistance. In preferred embodiments, the base oxide is selected from zirconia and hafnia. The group A and group B cluster-promoting oxide dopants preferably are selected such that the group A dopant has a smaller cationic radius than the primary stabilizer oxide, and so that the primary stabilizer oxide has a small cationic radius than that of the group B dopant.Type: GrantFiled: November 17, 2005Date of Patent: March 6, 2007Assignees: Ohio Aerospace Institute, The United States of America as represented by the Administrator of the National Aeronautics and Space AdministrationInventors: Dongming Zhu, Robert A. Miller
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Patent number: 7001859Abstract: A thermal barrier coating composition is provided. The composition has a base oxide, a primary stabilizer, and at least two additional cationic oxide dopants. Preferably, a pair of group A and group B defect cluster-promoting oxides is used in conjunction with the base and primary stabilizer oxides. The new thermal barrier coating is found to have significantly lower thermal conductivity and better sintering resistance. In preferred embodiments, the base oxide is selected from zirconia and hafnia. The group A and group B cluster-promoting oxide dopants preferably are selected such that the group A dopant has a smaller cationic radius than the primary stabilizer oxide, and so that the primary stabilizer oxide has a small cationic radius than that of the group B dopant.Type: GrantFiled: August 27, 2004Date of Patent: February 21, 2006Assignees: Ohio Aerospace Institute, The United States of America as represented by the Administrator of the National Aeronautics and Space AdministrationInventors: Dongming Zhu, Robert A. Miller
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Patent number: 6992202Abstract: A single source precursor for depositing ternary I-III-VI2 chalcopyrite materials useful as semiconductors. The single source precursor has the I-III-VI2 stoichiometry “built into” a single precursor molecular structure which degrades on heating or pyrolysis to yield the desired I-III-VI2 ternary chalcopyrite. The single source precursors effectively degrade to yield the ternary chalcopyrite at low temperature, e.g. below 500° C., and are useful to deposit thin film ternary chalcopyrite layers via a spray CVD technique. The ternary single source precursors according to the invention can be used to provide nanocrystallite structures useful as quantum dots. A method of making the ternary single source precursors is also provided.Type: GrantFiled: October 31, 2003Date of Patent: January 31, 2006Assignees: Ohio Aerospace Institute, The United States of America as represented by the Administrator of the National Aeronautics and Space AdministrationInventors: Kulbinder K. Banger, Aloysius F. Hepp, Jerry D. Harris, Michael Hyun-Chul Jin, Stephanie L. Castro