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).

  • Publication number: 20190204116
    Abstract: 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: Application
    Filed: March 5, 2019
    Publication date: July 4, 2019
    Applicant: Regents of the University of Minnesota
    Inventors: Rajesh Rajamani, Saber Taghvaeeyan
  • Patent number: 10260904
    Abstract: 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: Grant
    Filed: March 19, 2014
    Date of Patent: April 16, 2019
    Assignee: Regents of the University of Minnesota
    Inventors: Rajesh Rajamani, Saber Taghvaeeyan
  • Publication number: 20190078946
    Abstract: 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: Application
    Filed: September 11, 2018
    Publication date: March 14, 2019
    Inventors: Ye Zhang, Rajesh Rajamani, Serdar A. Sezen
  • Patent number: 10206621
    Abstract: 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: Grant
    Filed: August 18, 2016
    Date of Patent: February 19, 2019
    Assignees: Regents of the University of Minnesota, Mayo Foundation for Medical Education and Research
    Inventors: Song Zhang, Rajesh Rajamani, Bruce Johnson
  • Publication number: 20190022375
    Abstract: 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: Application
    Filed: July 18, 2018
    Publication date: January 24, 2019
    Inventors: Corey Edward Cruttenden, Rajesh Rajamani, Wei Chen, Xiao-Hong Zhu, Mahdi Ahmadi
  • Publication number: 20190011289
    Abstract: 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: Application
    Filed: August 20, 2018
    Publication date: January 10, 2019
    Applicant: Regents of the University of Minnesota
    Inventors: Heng Wang, Rajesh Rajamani, Ryan Madson
  • Patent number: 10144474
    Abstract: 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: Grant
    Filed: June 30, 2017
    Date of Patent: December 4, 2018
    Assignee: REGENTS OF THE UNIVERSITY OF MINNESOTA
    Inventors: Rajesh Rajamani, Woongsun Jeon
  • Publication number: 20180023940
    Abstract: 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: Application
    Filed: July 24, 2017
    Publication date: January 25, 2018
    Applicant: Regents of the University of Minnesota
    Inventors: Ryan Madson, Rajesh Rajamani
  • Publication number: 20180001952
    Abstract: 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: Application
    Filed: June 30, 2017
    Publication date: January 4, 2018
    Inventors: Rajesh Rajamani, Woongsun Jeon
  • Patent number: 9797819
    Abstract: 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: Grant
    Filed: March 7, 2013
    Date of Patent: October 24, 2017
    Assignee: Regents of the University of Minnesota
    Inventors: Rajesh Rajamani, Kalpesh Singal
  • Publication number: 20170049394
    Abstract: 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: Application
    Filed: August 18, 2016
    Publication date: February 23, 2017
    Applicants: Regents of the University of Minnesota, Mayo Foundation for Medical Education and Research
    Inventors: Song Zhang, Rajesh Rajamani, Bruce Johnson
  • Publication number: 20160282141
    Abstract: 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: Application
    Filed: March 19, 2014
    Publication date: September 29, 2016
    Applicant: Regents of the University of Minnesota
    Inventors: Rajesh Rajamani, Saber Taghvaeeyan
  • Publication number: 20150282753
    Abstract: 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: Application
    Filed: April 8, 2015
    Publication date: October 8, 2015
    Inventors: Mahdi Ahmadi, Rajesh Rajamani, Gerald Timm
  • Patent number: 9060713
    Abstract: Some embodiments of a tissue sensor may include a micro-fabricated structure that can be coupled to a medical instrument, such as a probe, an endoscopic tool, or another minimally invasive instrument. The tissue sensor can be configured to provide information indicate of tissue properties, such as tissue elasticity characteristics or the type of tissue.
    Type: Grant
    Filed: April 7, 2010
    Date of Patent: June 23, 2015
    Assignee: Regents of the University of Minnesota
    Inventors: Rajesh Rajamani, Peng Peng, Ahmet Serdar Sezen, Arthur G. Erdman
  • Publication number: 20130238257
    Abstract: 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: Application
    Filed: March 7, 2013
    Publication date: September 12, 2013
    Inventors: Rajesh Rajamani, Kalpesh Singal
  • Publication number: 20120041345
    Abstract: Some embodiments of a tissue sensor may include a micro-fabricated structure that can be coupled to a medical instrument, such as a probe, an endoscopic tool, or another minimally invasive instrument. The tissue sensor can be configured to provide information indicate of tissue properties, such as tissue elasticity characteristics or the type of tissue.
    Type: Application
    Filed: April 7, 2010
    Publication date: February 16, 2012
    Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA
    Inventors: Rajesh Rajamani, Peng Peng, Ahmet Serdar Sezen, Arthur G. Erdman
  • Patent number: 7995777
    Abstract: A thin film acoustic transducer is formed with an electrically actuatable substantially transparent thin film. Substantially transparent conductive thin films are supported on both sides of the electrically actuatable substantially transparent thin film. The thin film transducer may be used to sense sound, or produce sound in various embodiments. In further embodiments, the film may be attached to a window, and operate as a speaker for an audio system, or may provide noise cancellation functions. In further embodiments, the film may be attached to a computer monitor, touch panel, poster, or other surface, and operate as a speaker. A method of forming carbon nanotube thin films uses a layer by layer assembly technique and a positively charged hydrophilic layer on a thin film substrate.
    Type: Grant
    Filed: October 3, 2006
    Date of Patent: August 9, 2011
    Inventors: Xun Yu, Rajesh Rajamani, Kim A. Stelson, Tianhong Cui
  • Publication number: 20110127090
    Abstract: In general, the disclosure is directed to techniques for sensing the weight of a load object passing over a measurement surface. In some examples, a weigh-in motion (WIM) sensor is provided that includes a first beam that exhibits a linear elastance function, and a second beam that exhibits a nonlinear elastance function. In additional examples, the WIM sensor may include a measurement circuit configured to generate information corresponding to a weight of the load object, a wireless transmission circuit configured to transmit the information to a receiving station, and an energy harvesting circuit configured to harvest an amount of energy from vehicle vibrations. The energy harvested may be sufficient to power the wireless transmission circuit. In further examples, a WIM system is provided that includes a sequence of sensors. Information from the sequence of sensors may be used to remove noise in the raw data due to vehicle vibration.
    Type: Application
    Filed: November 30, 2010
    Publication date: June 2, 2011
    Inventors: Krishna Vijayaraghavan, Sean Pruden, Rajesh Rajamani
  • Publication number: 20070081681
    Abstract: A thin film acoustic transducer is formed with an electrically actuatable substantially transparent thin film. Substantially transparent conductive thin films are supported on both sides of the electrically actuatable substantially transparent thin film. The thin film transducer may be used to sense sound, or produce sound in various embodiments. In further embodiments, the film may be attached to a window, and operate as a speaker for an audio system, or may provide noise cancellation functions. In further embodiments, the film may be attached to a computer monitor, touch panel, poster, or other surface, and operate as a speaker. A method of forming carbon nanotube thin films uses a layer by layer assembly technique and a positively charged hydrophilic layer on a thin film substrate.
    Type: Application
    Filed: October 3, 2006
    Publication date: April 12, 2007
    Inventors: Xun Yu, Rajesh Rajamani, Kim Stelson, Tianhong Cui
  • Patent number: 5866861
    Abstract: In an elevator active guidance system, in order to avoid the action of one actuator (23) from interfering with the action of another, a controller (21) is provided that uses a force law based on a model of the elevator (40), and uses information from all of the sensors (22) in combination to determine, according to the force law, the force each actuator (23) should provide. The model of the elevator (40) is used to determine how the elevator (40) will respond to the forces exerted by the actuators (23). In the preferred embodiment, the elevator (40) is assumed to respond to the actuator forces as a rigid body. The full model is built up from this basic assumption, finally including all of the geometric and inertial attributes of the elevator necessary to describe its rigid body motion in response to forces from actuators (23).
    Type: Grant
    Filed: August 27, 1996
    Date of Patent: February 2, 1999
    Assignee: Otis Elevator Company
    Inventors: Rajesh Rajamani, Timothy M. Remmers, Randall K. Roberts