Patents by Inventor Rajesh Rajamani
Rajesh Rajamani 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: 20240093653Abstract: A method of estimating in-cylinder pressure includes receiving a vibration signal from a vibration sensor mounted proximate a compression ignition (CI) engine, receiving angular position information for the CI engine, and determining in-cylinder pressure based on the angular position information and on a combustion component of the vibration signal.Type: ApplicationFiled: September 12, 2023Publication date: March 21, 2024Inventors: Rajesh Rajamani, Woongsun Jeon
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Publication number: 20230293050Abstract: An example wearable respiratory motion sensor system includes a plurality of inertial measurement units (IMUs) to be positioned on a subject and generate accelerometer and gyroscope signals. The wearable respiratory motion sensor system also includes a processor to compute three-dimensional displacements of a rib cage and an abdomen of the subject based on the generated accelerometer and gyroscope signals.Type: ApplicationFiled: July 27, 2021Publication date: September 21, 2023Applicant: Regents of the University of MinnesotaInventors: Rajesh Rajamani, Paolo Pianosi, Gregory W. Johnson
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Publication number: 20230069973Abstract: A device includes a substrate, an electrode, an electrical pad, and a signal line. The signal line is coupled to the substrate and covered by an insulation layer. The signal line is coupled to the electrical pad and the electrode. At least one of the electrode and the signal line includes a diamagnetic material and paramagnetic material, wherein a ratio of the diamagnetic material and the paramagnetic material is selected based on the susceptibility properties of a physiological tissue. The term paramagnetic herein refers to magnetic susceptibility greater than that of the surrounding tissue and diamagnetic refers to magnetic susceptibility lower than that of the tissue.Type: ApplicationFiled: August 16, 2022Publication date: March 9, 2023Inventors: Corey Edward Cruttenden, Rajesh Rajamani, Wei Chen, Xiao-Hong Zhu, Mahdi Ahmadi
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Publication number: 20220330903Abstract: A sensing and processing system includes a plurality of wearable sensing devices each including an inertial measurement unit (IMU) to be positioned on a subject and generate accelerometer signals and gyroscope signals. The system includes a processor to identify near-fall events indicative of the subject nearly falling down based on the generated accelerometer signals and gyroscope signals, and wherein the processor is to generate, for each of the near-fall events, subject response data indicative of a recovery response of the subject to recover from the near-fall event.Type: ApplicationFiled: April 19, 2022Publication date: October 20, 2022Applicant: Regents of the University of MinnesotaInventors: Robert McGovern, Ali Nouriani, Rajesh Rajamani
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Patent number: 11439810Abstract: A device includes a substrate, an electrode, an electrical pad, and a signal line. The signal line is coupled to the substrate and covered by an insulation layer. The signal line is coupled to the electrical pad and the electrode. At least one of the electrode and the signal line includes a diamagnetic material and paramagnetic material, wherein a ratio of the diamagnetic material and the paramagnetic material is selected based on the susceptibility properties of a physiological tissue. The term paramagnetic herein refers to magnetic susceptibility greater than that of the surrounding tissue and diamagnetic refers to magnetic susceptibility lower than that of the tissue.Type: GrantFiled: July 18, 2018Date of Patent: September 13, 2022Assignee: Regents of the University of MinnesotaInventors: Corey Edward Cruttenden, Rajesh Rajamani, Wei Chen, Xiao-Hong Zhu, Mahdi Ahmadi
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Publication number: 20220195689Abstract: One example is directed to an end effector position estimation system for an off-road vehicle, which includes at least one inertial measurement unit (IMU) configured to be positioned on at least one of actuators and links of the vehicle that together move the end effector of the vehicle, and configured to generate measurement signals. The position estimation system includes at least one other IMU configured to be positioned on a base of the vehicle, and configured to generate other measurement signals. The position estimation system includes an estimation unit to estimate a position of the end effector of the vehicle based at least in part on the measurement signals and the other measurement signals, wherein the estimation unit is configured to perform an estimation method that removes an influence of terrain-induced vibrations and terrain slope in the measurement signals based on the other measurement signals.Type: ApplicationFiled: December 17, 2021Publication date: June 23, 2022Applicant: Regents of the University of MinnesotaInventors: Rajesh Rajamani, Gregory W. Johnson
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Patent number: 10914566Abstract: A position sensing system for measuring a position of a moving object includes an electromagnet configured to generate an alternating magnetic field, and a magnetic sensor configured to measure an intensity of a first magnetic field that is based on the alternating magnetic field. A controller is configured to estimate a position of the moving object based on the measured intensity of the first magnetic field.Type: GrantFiled: July 24, 2017Date of Patent: February 9, 2021Assignee: Regents of the University of MinnesotaInventors: Ryan Madson, Rajesh Rajamani
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Patent number: 10837802Abstract: A position sensing system for measuring a position of a linearly moving object includes a high magnetic permeability material positioned on the moving object, an electromagnet configured to generate an alternating magnetic field, and at least one magnetic sensor configured to measure an intensity of a first magnetic field that is based on the alternating magnetic field. A controller is configured to estimate a linear position of the moving object based on the measured intensity of the first magnetic field.Type: GrantFiled: August 20, 2018Date of Patent: November 17, 2020Assignee: Regents of the University of MinnesotaInventors: Heng Wang, Rajesh Rajamani, Ryan Madson
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Patent number: 10548523Abstract: A pressure sensing catheter system includes a urethral catheter and a sensor array formed on the urethral catheter. The sensor array includes a plurality of pressure sensors distributed along a length of the urethral catheter. The sensor array is configured to produce a dynamic pressure distribution profile along a urethra.Type: GrantFiled: April 8, 2015Date of Patent: February 4, 2020Assignee: Regents of the University of MinnesotaInventors: Mahdi Ahmadi, Rajesh Rajamani, Gerald Timm
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Patent number: 10436604Abstract: A position sensing system for measuring a position of a moving object includes a first magnetic sensor configured to measure an intensity of a magnetic field produced by the moving object. The system includes a controller configured to estimate a position of the moving object based on a nonlinear model of the magnetic field produced by the moving object as a function of position around the moving object, and based on the measured intensity of the magnetic field produced by the moving object.Type: GrantFiled: March 5, 2019Date of Patent: October 8, 2019Assignee: Regents of the University of MinnesotaInventors: Rajesh Rajamani, Saber Taghvaeeyan
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Publication number: 20190204116Abstract: A position sensing system for measuring a position of a moving object includes a first magnetic sensor configured to measure an intensity of a magnetic field produced by the moving object. The system includes a controller configured to estimate a position of the moving object based on a nonlinear model of the magnetic field produced by the moving object as a function of position around the moving object, and based on the measured intensity of the magnetic field produced by the moving object.Type: ApplicationFiled: March 5, 2019Publication date: July 4, 2019Applicant: Regents of the University of MinnesotaInventors: Rajesh Rajamani, Saber Taghvaeeyan
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Patent number: 10260904Abstract: A position sensing system for measuring a position of a moving object includes a first magnetic sensor configured to measure an intensity of a magnetic field produced by the moving object. The system includes a controller configured to estimate a position of the moving object based on a nonlinear model of the magnetic field produced by the moving object as a function of position around the moving object, and based on the measured intensity of the magnetic field produced by the moving object.Type: GrantFiled: March 19, 2014Date of Patent: April 16, 2019Assignee: Regents of the University of MinnesotaInventors: Rajesh Rajamani, Saber Taghvaeeyan
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Publication number: 20190078946Abstract: Supercapacitor-based sensors having flexible solid-state electrolytic elements are described. The deformation of the electrolytic element in response to an applied force or strain changes the area of capacitive layers defined by contacting surfaces of the electrolytic element and one or more electrodes of the sensor. The resulting change in capacitance of the capacitive double layers is indicative of the magnitude of the applied force or of the strain. The flexible solid-state electrolytic element may include cellulosic material distributed in a cured ionic polymeric matrix. Techniques for forming the flexible solid-state electrolytic element include wetting a cellulosic material with a photocurable composition comprising an ionic liquid, a prepolymer composition, and a photoinitiator, and photocuring the photocurable composition for a predetermined curing period by exposing the wetted cellulosic material to a predetermined curing wavelength.Type: ApplicationFiled: September 11, 2018Publication date: March 14, 2019Inventors: Ye Zhang, Rajesh Rajamani, Serdar A. Sezen
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Patent number: 10206621Abstract: This disclosure describes devices, system, and a method for the prediction and prevention of acute decompensated heart failure or other patient conditions involving fluid accumulation in legs or hands. In one example, a wearable device contains a drift-free leg-size sensor and a tissue-elasticity sensor. Both sensors may be relatively inexpensive and developed using innovative new sensing ideas. Preliminary tests with the sensor prototypes show promising results: the leg-size sensor is capable of measuring 1 mm changes in leg diameter and the tissue-elasticity sensor can detect 0.15 MPa differences in elasticity. In another example, a wearable system includes sensors for measuring a variety of physiological parameters, a processing module, and a communication module. A low-profile instrumented sock, e.g., a wearable device, with multiple sensors can provide an indication of heart failure status for a patient.Type: GrantFiled: August 18, 2016Date of Patent: February 19, 2019Assignees: Regents of the University of Minnesota, Mayo Foundation for Medical Education and ResearchInventors: Song Zhang, Rajesh Rajamani, Bruce Johnson
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Publication number: 20190022375Abstract: A device includes a substrate, an electrode, an electrical pad, and a signal line. The signal line is coupled to the substrate and covered by an insulation layer. The signal line is coupled to the electrical pad and the electrode. At least one of the electrode and the signal line includes a diamagnetic material and paramagnetic material, wherein a ratio of the diamagnetic material and the paramagnetic material is selected based on the susceptibility properties of a physiological tissue. The term paramagnetic herein refers to magnetic susceptibility greater than that of the surrounding tissue and diamagnetic refers to magnetic susceptibility lower than that of the tissue.Type: ApplicationFiled: July 18, 2018Publication date: January 24, 2019Inventors: Corey Edward Cruttenden, Rajesh Rajamani, Wei Chen, Xiao-Hong Zhu, Mahdi Ahmadi
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Publication number: 20190011289Abstract: A position sensing system for measuring a position of a linearly moving object includes a high magnetic permeability material positioned on the moving object, an electromagnet configured to generate an alternating magnetic field, and at least one magnetic sensor configured to measure an intensity of a first magnetic field that is based on the alternating magnetic field. A controller is configured to estimate a linear position of the moving object based on the measured intensity of the first magnetic field.Type: ApplicationFiled: August 20, 2018Publication date: January 10, 2019Applicant: Regents of the University of MinnesotaInventors: Heng Wang, Rajesh Rajamani, Ryan Madson
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Patent number: 10144474Abstract: Bicycle collision systems, apparatus, and methods may include, or use, one or more various sensing apparatus to detect vehicles or other objects that may collide, or potentially collide, with a bicycle. The sensing apparatus may include at least one of side sensing apparatus, rear sensing apparatus, and front sensing apparatus. Further, alert apparatus may be used to alert not only the cyclist but also the driver of a vehicle of an imminent collision.Type: GrantFiled: June 30, 2017Date of Patent: December 4, 2018Assignee: REGENTS OF THE UNIVERSITY OF MINNESOTAInventors: Rajesh Rajamani, Woongsun Jeon
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Publication number: 20180023940Abstract: A position sensing system for measuring a position of a moving object includes an electromagnet configured to generate an alternating magnetic field, and a magnetic sensor configured to measure an intensity of a first magnetic field that is based on the alternating magnetic field. A controller is configured to estimate a position of the moving object based on the measured intensity of the first magnetic field.Type: ApplicationFiled: July 24, 2017Publication date: January 25, 2018Applicant: Regents of the University of MinnesotaInventors: Ryan Madson, Rajesh Rajamani
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Publication number: 20180001952Abstract: Bicycle collision systems, apparatus, and methods may include, or use, one or more various sensing apparatus to detect vehicles or other objects that may collide, or potentially collide, with a bicycle. The sensing apparatus may include at least one of side sensing apparatus, rear sensing apparatus, and front sensing apparatus. Further, alert apparatus may be used to alert not only the cyclist but also the driver of a vehicle of an imminent collision.Type: ApplicationFiled: June 30, 2017Publication date: January 4, 2018Inventors: Rajesh Rajamani, Woongsun Jeon
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Patent number: 9797819Abstract: A device includes a first sensor and a second sensor. The first sensor is configured to generate a first signal corresponding to a detected first force. The second sensor is configured to generate a second signal corresponding to a detected second force. The first force and the second force has a substantially common direction. The device includes a processor configured to determine a measure of tension using the first signal and using the second signal. The measure of tension corresponds to displacement of an elongate member.Type: GrantFiled: March 7, 2013Date of Patent: October 24, 2017Assignee: Regents of the University of MinnesotaInventors: Rajesh Rajamani, Kalpesh Singal