Patents by Inventor Viorel-Georgel Dumitru
Viorel-Georgel Dumitru 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: 20160056239Abstract: A diamond based oxygen sensor is able to function in harsh environment conditions. The oxygen sensor includes a gateless field effect transistor including a synthetic, quasi-intrinsic, hydrogen-passivated, monocrystalline diamond layer exhibiting a 2-dimension hole gas effect. The oxygen sensor also includes a sensing layer comprising yttrium-stabilized zirconia deposited onto a surface of the gateless field effect transistor.Type: ApplicationFiled: August 18, 2015Publication date: February 25, 2016Inventors: Mihai Brezeanu, Bogdan-Catalin Serban, Viorel Georgel Dumitru, Octavian Buiu
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Publication number: 20160038908Abstract: The present disclosure relates to a nanostructured palladium-based flammable gas detector synthesized using sonochemistry. The nanostructured palladium-based flammable gas detectors may use nanostructured sensing materials to allow reduction of power consumption, where the nanostructures reduce power consumption due to their large specific area and increased porosity.Type: ApplicationFiled: July 30, 2015Publication date: February 11, 2016Inventors: Cornel P. COBIANU, Bogdan-Catalin SERBAN, Alisa STRATULAT, Viorel Georgel DUMITRU, Mihai BREZEANU, Octavian BUIU
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Publication number: 20160011161Abstract: A metal oxide heterostructure includes mixing a first precursor and a second precursor to form a precursor aqueous mixture, adding at least one constituent to the precursor aqueous mixture to form a first solution, adding a nanostructuring reagent to the first solution to form a second solution, sonochemically treating the second solution to provide a metal oxide powder, filtering, washing, and drying the metal oxide powder to provide a metal oxide nanocomposite heterostructure for a sensing layer of a hydrogen sulfide sensor. A method for forming a hydrogen sulfide sensor includes the metal oxide heterostructure, forming a sensing material, contacting the sensing material with interdigitated electrodes to form a sensing layer, and thermally consolidating the sensing layer to form the hydrogen sulfide sensor.Type: ApplicationFiled: July 6, 2015Publication date: January 14, 2016Inventors: Cornel P. COBIANU, Viorel Georgel DUMITRU, Bogdan-Catalin SERBAN, Alisa STRATULAT, Mihai BREZEANU, Octavian BUIU
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Patent number: 9136490Abstract: A solar cell includes multiple organic materials (including at least one donor material and at least one acceptor material) and multiple inorganic materials. The organic and inorganic materials collectively form multiple hybrid heterojunction structures. Each hybrid heterojunction structure includes at least two organic materials and at least one inorganic material. A first of the inorganic materials could include nanowires and/or nanotubes, and a second of the inorganic materials could include nanoparticles and/or quantum dots. At least some of the nanoparticles or quantum dots could have different sizes, where the different sizes are associated with different absorption bandgaps. Excitons photo-generated in at least one of the organic materials may dissociate into holes and electrons. Also, electrons and holes photo-generated in at least one of the inorganic material may separate. Further, one or more of the inorganic materials may transport at least some of the electrons towards one of multiple electrodes.Type: GrantFiled: October 13, 2008Date of Patent: September 15, 2015Assignee: Honeywell International Inc.Inventors: Viorel-Georgel Dumitru, Mihai N Mihaila, Bogdan-Catalin Serban
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Publication number: 20150177184Abstract: The present disclosure relates to a carbon dioxide sensor able to function in harsh environment, conditions. The carbon dioxide sensor can include a gate-less field effect transistor including a synthetic, quasi-intrinsic, hydrogen-passivated, single-crystal diamond layer exhibiting a 2-dimension hole gas effect, and a sensing layer comprising both a polymer and a hygroscopic material deposited onto a surface of the gate-less field effect transistor.Type: ApplicationFiled: December 17, 2014Publication date: June 25, 2015Inventors: Mihai BREZEANU, Bogdan Catalin SERBAN, Octavian BUIU, Viorel Georgel DUMITRU
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Publication number: 20150177078Abstract: A dynamic strain sensor includes a strain sensitive transistor and a light emitting diode coupled to the strain sensitive transistor. The dynamic strain sensor can include a piezoelectric layer incorporated into the structure of the strain sensitive transistor. The dynamic strain sensor can sense dynamic strain and can measure and monitor the dynamic strain wirelessly.Type: ApplicationFiled: December 9, 2014Publication date: June 25, 2015Inventors: Viorel Georgel DUMITRU, Stefan Dan COSTEA, Ion GEORGESCU, Mihai BREZEANU
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Publication number: 20150022491Abstract: The present disclosure relates to a touch sensor and touch sensitive display having a plurality of first and second conductive lines arranged substantially orthogonally with a sensing material to sense a change in capacitance between them. The first and second conductive lines and the sensing material defining an array of sensitive transistors.Type: ApplicationFiled: July 16, 2014Publication date: January 22, 2015Inventors: Viorel Georgel Dumitru, Stefan Dan Costea, Ion Georgescu, Mihai Brezeanu, Bogdan-Catalin Serban
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Patent number: 8826724Abstract: Chemical sensors such as carbon dioxide sensors and methods for making such sensors are disclosed. An example carbon dioxide sensor may include a substrate, with a sensing beam supported by the substrate. The sensing beam may be configured to resonant. A sensing layer may be disposed on the sensing beam, wherein the sensing layer may include an amino group and is configured to sense carbon dioxide. In some instances, a reference beam may also be supported by the substrate, and may be configured to resonant. A reference layer may be disposed on the reference beam, wherein the reference layer may includes an amino group that has been poisoned so that it will be substantially non-sensitive to carbon dioxide.Type: GrantFiled: December 21, 2011Date of Patent: September 9, 2014Assignee: Honeywell International Inc.Inventors: Bogdan Serban, Mihai N. Mihalia, Cornel Cobianu, Viorel Georgel Dumitru, Octavian Buiu
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Patent number: 8710354Abstract: A solar cell may include a light sensitive molecule such as a hyperpolarizable molecule. In one example, a solar cell may include a layer of hyperpolarizable molecules disposed between a p-type electrode and an n-type electrode. In some cases, at least some of the hyperpolarizable molecules may include an electron donating group that is bonded or otherwise linked to the n-type electrode as well as an electron accepting group that is bonded or otherwise linked to the p-type electrode. In some instances, at least some of the hyperpolarizable molecules may include an electron donating group that is bonded or otherwise linked to the p-type electrode as well as an electron accepting group that is bonded or otherwise linked to the n-type electrode.Type: GrantFiled: December 17, 2008Date of Patent: April 29, 2014Assignee: Honeywell International Inc.Inventors: Mihai N. Mihaila, Bogdan Catalin Serban, Viorel Georgel Dumitru, Mircea Bercu, Cazimir Bostan, Stephan Dan Costea
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Patent number: 8609427Abstract: A sulfur dioxide sensor comprising a first beam having a functionalized sensing surface capable of sensing sulfur dioxide, the first beam capable of producing a first resonant frequency; and a second beam having a functionalized reference surface not capable of sensing sulfur dioxide, the second beam capable of producing a second resonant frequency, wherein differential sensing of sulfur dioxide may be performed, further wherein the first beam is functionalized with a liquid phase of a first polymeric compound and the second beam is functionalized with a liquid phase of a second polymeric compound is provided. In one embodiment, the sensor is a nano-sensor capable of low drift accurately detecting sulfur dioxide levels at the zeptograms level. Methods of making and using a sulfur dioxide sensor are also provided.Type: GrantFiled: December 7, 2010Date of Patent: December 17, 2013Assignee: Honeywell Romania s.r.l.Inventors: Bogdan Catalin Serban, Cornel P. Cobianu, Mihai N. Mihaila, Viorel Georgel Dumitru
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Patent number: 8563319Abstract: A nitrogen dioxide sensor comprising a first beam having a first functionalized sensing surface capable of sensing nitrogen dioxide, the first beam capable of producing a first resonant frequency; and a second beam having a second functionalized reference surface not capable of sensing nitrogen dioxide, the second beam capable of producing a second resonant frequency, wherein differential sensing of nitrogen dioxide may be performed, further wherein the first beam and the second beam are each functionalized with one or more soft bases having comparable viscoelastic properties is provided. In one embodiment, the sensor is a nano-sensor capable of low drift and accurate detection of nitrogen dioxide levels at the zeptogram level. Methods of making and using a nitrogen dioxide sensor are also provided.Type: GrantFiled: December 7, 2010Date of Patent: October 22, 2013Assignee: Honeywell Romania S.R.L.Inventors: Bogdan Catalin Serban, Cornel P. Cobianu, Mihai N. Mihaila, Viorel Georgel Dumitru, Octavian Buiu
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Patent number: 8544314Abstract: A carbon dioxide sensor comprising a first beam that includes a functionalized surface and a second beam that includes a functionalized surface such that reduced-drift differential sensing of carbon dioxide may be performed by monitoring changes in the resonant frequency of the first beam relative to the resonant frequency of second beam.Type: GrantFiled: December 7, 2010Date of Patent: October 1, 2013Assignee: Honeywell Romania S.R.L.Inventors: Bogdan Catalin Serban, Cornel P. Cobianu, Mihai N. Mihaila, Viorel Georgel Dumitru
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Patent number: 8546817Abstract: An example sensor that includes a first Schottky diode, a second Schottky diode and an integrated circuit. The sensor further includes a voltage generator that generates a first voltage across the first Schottky diode and a second voltage across the second Schottky diode. When the first Schottky diode and the second Schottky diode are subjected to different strain, the integrated circuit measures the values of the currents flowing through the first Schottky diode and the second Schottky diode to determine the strain on an element where the first Schottky diode and the second Schottky diode are attached.Type: GrantFiled: November 30, 2011Date of Patent: October 1, 2013Assignee: Honeywell International Inc.Inventors: Viorel Georgel Dumitru, Mihai Brezeanu, Stefan Dan Costea, Ion Georgescu, Viorel Avramescu, Bogdan Catalin Serban
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Patent number: 8519449Abstract: A piezoelectric strain sensor and method thereof for detecting strain, vibration, and/or pressure. The sensor incorporates a sequence of piezoelectric and semiconductor layers in a thin-film transistor structure. The thin-film transistor structure can be configured on a flexible substrate via a low-cost fabrication technique. The piezoelectric layer generates an electric charge resulting in a modulation of a transistor current, which is a measure of external strain. The sensor can be formed as a single gate field-effect piezoelectric sensor and a dual gate field-effect piezoelectric sensor. The semiconductor layer can be configured from a nanowire array resulting in a metal-piezoelectric-nanowire field effect transistor. The single and dual gate field-effect piezoelectric sensor offer increased sensitivity and device control due to the presence of the piezoelectric layer in the transistor structure and low cost manufacturability on large area flexible substrates.Type: GrantFiled: July 23, 2010Date of Patent: August 27, 2013Assignee: Honeywell International Inc.Inventors: Viorel-Georgel Dumitru, Cornel Cobianu, Stefan-Dan Costea, Bogdan-Catalin Serban
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Patent number: 8373063Abstract: A solar cell is disclosed that includes an electron conductor layer and a quantum dot layer. The quantum dot layer may include a plurality of quantum dots. A bridge layer may be coupled to the electron conductor layer and to the quantum dot layer. The bridge layer may include an antibiotic, a sulfur-containing amino acid, a vitamin, and/or a vitamin analogue. In some cases, a hole conductor layer may be coupled to the quantum dot layer.Type: GrantFiled: March 26, 2009Date of Patent: February 12, 2013Assignee: Honeywell International Inc.Inventors: Bogdan Serban, Mihai N. Mihaila, Cazimir Bostan, Viorel Georgel Dumitru
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Patent number: 8299355Abstract: A solar cell including a quantum dot and an electron conductor, with a bifunctional ligand disposed between the quantum dot and the electron conductor. The bifunctional ligand molecule may include an electron conductor anchor that bonds to the electron conductor and a first quantum dot anchor that bonds to the quantum dot. A hole conductor such as a conductive polymer may include a second quantum dot anchor. In some instances, the first quantum dot may include selenium.Type: GrantFiled: March 26, 2009Date of Patent: October 30, 2012Assignee: Honeywell International Inc.Inventors: Bogdan Serban, Mihai N. Mihaila, Viorel Georgel Dumitru, Cazimir Bostan, Stefan Dan Costea
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Patent number: 8288649Abstract: A solar cell may include a quantum dot and an electron conductor. A bifunctional ligand may be disposed between the quantum dot and the electron conductor. The ligand molecule may include an electron conductor anchor that bonds to the electron conductor and a first quantum dot anchor that bonds to the quantum dot. A hole conductor such as a conductive polymer may include a second quantum dot anchor.Type: GrantFiled: February 25, 2009Date of Patent: October 16, 2012Assignee: Honeywell International Inc.Inventors: Bogdan Serban, Mihai N. Mihaila, Viorel Georgel Dumitru, Stephan Dan Costea
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Patent number: 8283561Abstract: A solar cell including a quantum dot and an electron conductor, and a bifunctional ligand disposed between the quantum dot and the electron conductor. The bifunctional ligand molecule may include an electron conductor anchor that bonds to the electron conductor and a first quantum dot anchor that bonds to the quantum dot. A hole conductor such as a conductive polymer may include a second quantum dot anchor.Type: GrantFiled: March 26, 2009Date of Patent: October 9, 2012Assignee: Honeywell International Inc.Inventors: Bogdan Serban, Mihai N. Mihaila, Stefan Dan Costea, Viorel Georgel Dumitru
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Patent number: 8230720Abstract: A resonant nanosensor apparatus associated with a functionalized monolayer for detecting carbon dioxide and a method of forming the same. A wafer including a sensing vibrating beam and a reference vibrating beam may be functionalized with a functional group in order to form a sensing self monolayer. The sensing self assembled monolayer may be configured by bridging oxygen or carbon atoms covalently bonded with respect to the vibrating beams. A liquid solution of hydrochloric acid may then be applied to the sensing self assembled monolayer at the surface of the reference beam by a direct printing process to obtain a reference monolayer. The liquid solution of HCl transforms the functional groups responsible for the carbon dioxide detection into protonated groups, which do not react with carbon dioxide, but possess visco-elastic properties similar to that of the sensing monolayer.Type: GrantFiled: August 16, 2010Date of Patent: July 31, 2012Assignee: Honeywell International Inc.Inventors: Bogdan-Catalin Serban, Cornel Cobianu, Mihai N. Mihaila, Viorel-Georgel Dumitru
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Publication number: 20120164029Abstract: Chemical sensors such as carbon dioxide sensors and methods for making such sensors are disclosed. An example carbon dioxide sensor may include a substrate, with a sensing beam supported by the substrate. The sensing beam may be configured to resonant. A sensing layer may be disposed on the sensing beam, wherein the sensing layer may include an amino group and is configured to sense carbon dioxide. In some instances, a reference beam may also be supported by the substrate, and may be configured to resonant. A reference layer may be disposed on the reference beam, wherein the reference layer may includes an amino group that has been poisoned so that it will be substantially non-sensitive to carbon dioxide.Type: ApplicationFiled: December 21, 2011Publication date: June 28, 2012Applicant: HONEYWELL ROMANIA S.R.L.Inventors: Bogdan Serban, Mihai N. Mihalia, Cornel Cobianu, Viorel Georgel Dumitru, Octavian Buiu