Patents by Inventor David E. Hardt
David E. Hardt 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: 11495858Abstract: A photovoltaic (PV) cell health monitoring apparatus includes a Radio Frequency Identification (RFID) tag mounted to the PV cell and having identifying information of the PV cell, and a sensor in communication with the RFID tag for measuring health information of the PV cell. The RFID tag stores the measured health information together with time and locality information of the PV cell and responds to an interrogation signal by transmitting the stored information together with the identifying information. A dust sensor in the form of a comb-like electrode array measures electrical capacitance as an indication of an amount of dust on an exposed surface of the PV cell. An RFID tag antenna arranged as a meander-line patch antenna covered with polyethylene has a dual function as a temperature sensor.Type: GrantFiled: February 24, 2020Date of Patent: November 8, 2022Assignees: KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, MASSACHUSETTS INSTITUTE OF TECHNOLOGYInventors: Muhammad A. Hawwa, Hussain M. Al-Qahtani, M. Wasim Raad, David E. Hardt
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Patent number: 10846584Abstract: A photovoltaic (PV) cell health monitoring apparatus includes a Radio Frequency Identification (RFID) tag mounted to the PV cell and having identifying information of the PV cell, and a sensor in communication with the RFID tag for measuring health information of the PV cell. The RFID tag stores the measured health information together with time and locality information of the PV cell and responds to an interrogation signal by transmitting the stored information together with the identifying information. A dust sensor in the form of a comb-like electrode array measures electrical capacitance as an indication of an amount of dust on an exposed surface of the PV cell. An RFID tag antenna arranged as a meander-line patch antenna covered with polyethylene has a dual function as a temperature sensor.Type: GrantFiled: December 12, 2018Date of Patent: November 24, 2020Assignee: King Fahd University of Petroleum and MineralsInventors: Muhammad A. Hawwa, Hussain M. Al-Qahtani, M. Wasim Raad, David E. Hardt
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Publication number: 20200259141Abstract: A photovoltaic (PV) cell health monitoring apparatus includes a Radio Frequency Identification (RFID) tag mounted to the PV cell and having identifying information of the PV cell, and a sensor in communication with the RFID tag for measuring health information of the PV cell. The RFID tag stores the measured health information together with time and locality information of the PV cell and responds to an interrogation signal by transmitting the stored information together with the identifying information. A dust sensor in the form of a comb-like electrode array measures electrical capacitance as an indication of an amount of dust on an exposed surface of the PV cell. An RFID tag antenna arranged as a meander-line patch antenna covered with polyethylene has a dual function as a temperature sensor.Type: ApplicationFiled: February 24, 2020Publication date: August 13, 2020Applicants: KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, MASSACHUSETTS INSTITUTE OF TECHNOLOGYInventors: Muhammad A. HAWWA, Hussain M. AL-QAHTANI, M. Wasim RAAD, David E. HARDT
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Publication number: 20200193258Abstract: A photovoltaic (PV) cell health monitoring apparatus includes a Radio Frequency Identification (RFID) tag mounted to the PV cell and having identifying information of the PV cell, and a sensor in communication with the RFID tag for measuring health information of the PV cell. The RFID tag stores the measured health information together with time and locality information of the PV cell and responds to an interrogation signal by transmitting the stored information together with the identifying information. A dust sensor in the form of a comb-like electrode array measures electrical capacitance as an indication of an amount of dust on an exposed surface of the PV cell. An RFID tag antenna arranged as a meander-line patch antenna covered with polyethylene has a dual function as a temperature sensor.Type: ApplicationFiled: December 12, 2018Publication date: June 18, 2020Applicants: KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, MASSACHUSETTS INSTITUTE OF TECHNOLOGYInventors: Muhammad A. HAWWA, Hussain M. AL-QAHTANI, M. Wasim RAAD, David E. HARDT
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Patent number: 9678011Abstract: System for visualization of conformal contact. The system visualizes conformal contact between a patterned stamp and a transparent impression surface. A patterned stamp is provided that includes a fluorescent structure for contact with the impression surface. A source of UV light is provided for transmission through the transparent impression surface to interact with the fluorescent structure to generate visible light re-emitted by the fluorescent structure. An imaging system captures the visible light to form a high-contrast image of an area of conformal contact between the patterned stamp and the impression surface. The high-contrast image comprises bright and dark regions representing contact and no contact respectively.Type: GrantFiled: January 30, 2015Date of Patent: June 13, 2017Assignees: Massachusetts Institute of Technology, King Fahd University of Petroleum and MineralsInventors: Larissa F. Nietner, Scott T. Nill, David E. Hardt, Muhammad A. Hawwa, Hussain Al-Qahtani
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Publication number: 20150219559Abstract: System for visualization of conformal contact. The system visualizes conformal contact between a patterned stamp and a transparent impression surface. A patterned stamp is provided that includes a fluorescent structure for contact with the impression surface. A source of UV light is provided for transmission through the transparent impression surface to interact with the fluorescent structure to generate visible light re-emitted by the fluorescent structure. An imaging system captures the visible light to form a high-contrast image of an area of conformal contact between the patterned stamp and the impression surface. The high-contrast image comprises bright and dark regions representing contact and no contact respectively.Type: ApplicationFiled: January 30, 2015Publication date: August 6, 2015Inventors: Larissa F. Nietner, Scott T. Nill, David E. Hardt, Muhammad A. Hawwa, Hassen Ouakad, Hussain Al-Qahtani
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Publication number: 20140037909Abstract: A practical implementation of a flexible and transparent capacitive sensor is disclosed. The results show that, while PDMS is an inherently nonlinear material, linear behavior with minimal hysteresis can be obtained over an appropriately small range of operation. Moreover, high resolution has been achieved during these tests.Type: ApplicationFiled: August 1, 2013Publication date: February 6, 2014Inventors: Muhammad A. Hawwa, Hussain Al-Qahtani, Hassen Ouakad, David E. Hardt, Joseph Edward Petrzelka, Brian Anthony
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Publication number: 20130337102Abstract: Precision embossing press. The press includes a rigid symmetric box frame and upper and lower parallel embossing platens mounted within the box frame for movement towards one another to provide an embossing compressive force on a work piece between the platens while maintaining parallelism between the platens. A thermal system controls platen temperature to heat the work piece for embossing and to cool the work piece for de-molding. A pneumatic actuator moves the lower platen toward the upper platen to emboss the work piece. A closed loop control system employing feedback and feed forward control loops controls platen temperatures and embossing force.Type: ApplicationFiled: June 12, 2013Publication date: December 19, 2013Applicant: Massachusetts Institute of TechnologyInventors: David E. Hardt, Maia Reynolds Bageant, Joseph Edward Petrzelka
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Publication number: 20110254199Abstract: A method of forming micro-based devices is provided that includes dispensing a liquid curable resin into a mold set with a reservoir section. Also, the method includes spinning the reservoir section and mold set so as to completely fill the patterning portion of the mold set with the liquid curable resin. The mold set is placed in a heating and cooling station that produces a cured part e. Also, the method includes moving the mold set and the cured part to a parting station, where the cured part is removed from the mold set.Type: ApplicationFiled: April 26, 2011Publication date: October 20, 2011Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGYInventors: Aaron D. Mazzeo, Anthony J. Schrauth, David E. Hardt
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Patent number: 5544195Abstract: A high-bandwidth continuous-flow arc furnace for stream welding applications includes a metal mass contained in a crucible having an orifice. A power source charges an electrode for generating an arc between the electrode and the mass. The arc heats the metal mass to a molten state. A pressurized gas source propels the molten metal mass through the crucible orifice in a continuous stream. As the metal is ejected, a metal feeder replenishes the molten metal bath. A control system regulates the electrode current, shielding gas pressure, and metal source to provide a continuous flow of molten metal at the crucible orifice. Independent control over the electrode current and shield gas pressure decouples the metal flow temperature and the molten metal flow rate, improving control over resultant weld characteristics.Type: GrantFiled: December 19, 1994Date of Patent: August 6, 1996Assignee: Massachusetts Institute of TechnologyInventors: David E. Hardt, Steven G. Lee