Patents by Inventor Nadarajah Narendran

Nadarajah Narendran 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).

  • Patent number: 7703942
    Abstract: A light emitting apparatus having a light source for emitting short wavelength radiation and an optic device configured to receive the radiation emitted from the light source. A device directs at least some of the short wavelength radiation emitted from the light source into the optic device and a down conversion material receives at least some of the short wavelength radiation directed into the optic device in one spectral region and emits the radiation in another spectral region.
    Type: Grant
    Filed: December 20, 2006
    Date of Patent: April 27, 2010
    Assignee: Rensselaer Polytechnic Institute
    Inventors: Nadarajah Narendran, Jean Paul Freyssinier, Yimin Gu
  • Publication number: 20080117500
    Abstract: A light emitting apparatus has a radiation source for emitting short wavelength radiation. A down conversion material receives and down converts at least some of the short wavelength radiation emitted by the radiation source and back transfers a portion of the received and down converted radiation. An optic device adjacent the down conversion material at least partially surrounds the radiation source. The optic device is configured to extract at least some of the back transferred radiation. A sealant substantially seals a space between the radiation source and the optic device.
    Type: Application
    Filed: December 22, 2006
    Publication date: May 22, 2008
    Inventors: Nadarajah Narendran, Yimin Gu
  • Publication number: 20080105887
    Abstract: A broad bandwidth light source including: a solid state light emitting device that generates short wavelength light; and quantum dot material and phosphor material that are each irradiated by some of the short wavelength light. The short wavelength light has a spectrum with a first peak wavelength shorter than about 500 nm. The quantum dot material absorbs some of the short wavelength light and reemits it as long wavelength light having a spectrum with a second peak wavelength longer than about 600 nm. The phosphor material absorbs some of the short wavelength light and reemits it as mid wavelength light having a spectrum with a peak wavelength between the first and second peak wavelength. The light source is configured such that some of each light (short, mid, and long wavelength) is emitted coincidently as a light having a chromaticity value near the blackbody locus and a color rendering index greater than 80.
    Type: Application
    Filed: June 20, 2006
    Publication date: May 8, 2008
    Inventors: Nadarajah Narendran, Yimin Gu
  • Publication number: 20080094829
    Abstract: A light emitting apparatus has a radiation source for emitting multi-colored radiation. A diffuser material receives at least a portion of the multi-colored radiation emitted by the radiation source and converts the multi-colored radiation into forward transferred radiation and back transferred radiation. An optic device is coupled to the diffuser material and is adapted to receive the back transferred radiation and extract at least a portion of the back transferred radiation from the optic device.
    Type: Application
    Filed: December 20, 2006
    Publication date: April 24, 2008
    Inventors: Nadarajah Narendran, Yimin Gu
  • Publication number: 20080054281
    Abstract: A light emitting apparatus having a light source for emitting short wavelength radiation and an optic device configured to receive the radiation emitted from the light source. A device directs at least some of the short wavelength radiation emitted from the light source into the optic device and a down conversion material receives at least some of the short wavelength radiation directed into the optic device in one spectral region and emits the radiation in another spectral region.
    Type: Application
    Filed: December 20, 2006
    Publication date: March 6, 2008
    Inventors: Nadarajah Narendran, Jean Paul Freyssinier, Yimin Gu
  • Publication number: 20080030993
    Abstract: A light emitting apparatus includes a source of light for emitting light; a down conversion material receiving the emitted light, and converting the emitted light into transmitted light and backward transmitted light; and an optic device configured to receive the backward transmitted light and transfer the backward transmitted light outside of the optic device. The source of light is a semiconductor light emitting diode, a laser diode (LD), or a resonant cavity light emitting diode (RCLED). The down conversion material includes one of phosphor or other material for absorbing light in one spectral region and emitting light in another spectral region. The optic device, or lens, includes light transmissive material.
    Type: Application
    Filed: May 5, 2005
    Publication date: February 7, 2008
    Inventors: Nadarajah Narendran, Yimin Gu, Jean Paul Freyssinier
  • Publication number: 20050285145
    Abstract: A system for transmitting a color image over a network. The system has a light source, a first reference color chart exhibiting a first spectral response, a camera capturing an image of the first reference color chart for transmission to a receiver, and a receiver for displaying the image. The displayed image exhibits a second spectral response. The system also has a second reference color generator replicating the first spectral response, a comparator for generating a signal responsive to a difference between the replicated first spectral response and the second spectral response, and an adjuster for adjusting the displayed image responsive to the signal.
    Type: Application
    Filed: June 23, 2004
    Publication date: December 29, 2005
    Inventor: Nadarajah Narendran
  • Patent number: 5760391
    Abstract: An optical sensor grating in a fiber-optic experiences a measurable parameter, such as strain, pressure and/or temperature. A passive nonuniform optical grating receives a light signal reflected by the optical sensor grating and spread out by a lens. A photodiode array behind the passive nonuniform optical grating senses a light intensity distribution of the reflected light signal. A microprocessor employs a simple peak detection algorithm to detect a maximum or minimum intensity of the reflected light signal at the photodiode array, and correlates the location of the maximum or minimum intensity to the measurable parameter experienced by the optical sensor grating.
    Type: Grant
    Filed: July 17, 1996
    Date of Patent: June 2, 1998
    Assignee: Mechanical Technology, Inc.
    Inventor: Nadarajah Narendran
  • Patent number: 5594819
    Abstract: A metallized glass fiber optic is braze-bonded or solder-bonded to a metal shim to form a sensor unit that may be spot welded to a structure for monitoring structural strain. Preferably shim thermal characteristics are selected to match those of the structure being monitored, and a cover plate protects the fiber after attachment to the shim. Alternatively, a non-metallized optical fiber is attached to the metal shim using a special ceramic adhesive coat whose metal constituents thermally match the thermal expansion co-efficient of the shim. After adhesive curing, a protective cover plate is attached. An embodiment for use with an extrinsic Fabry-Perot type sensor provides a metal plate with a fiber-sized groove that guides the target and the transmit/receive fiber optic elements together to form an air gap. Another embodiment metallizes the fiber optic elements with a mask ring having a depressed region into which a cover plate is attached.
    Type: Grant
    Filed: July 26, 1995
    Date of Patent: January 14, 1997
    Assignee: Electric Power Research Institute
    Inventors: Nadarajah Narendran, Joseph M. Weiss
  • Patent number: 5451772
    Abstract: A distributed optical fiber sensor for sensing physical characteristics of an object, such as strain, includes several discontinuities, each pair of discontinuities being placed at one specific location on the object. A laser beam is past through the fiber and the discontinuities generate components from the beams having parameters indicative of the respective physical characteristics. The components combine in a composite beam which is detected outside the beam and separated into the respective components.
    Type: Grant
    Filed: January 13, 1994
    Date of Patent: September 19, 1995
    Assignee: Mechanical Technology Incorporated
    Inventor: Nadarajah Narendran
  • Patent number: 5436988
    Abstract: An optical slip ring for acting as an interface between rotary member and a stationary detector includes a source for generating a light beam directed at a sensor on the rotary member and an optical fiber transmitting said beam to the sensor. The sensor generates in response a sensor signal indicative of a physical parameter of interest. This sensor signal is transmitted through the fiber to an output lens for pick up by a stationary detector.
    Type: Grant
    Filed: January 13, 1994
    Date of Patent: July 25, 1995
    Assignee: Mechanical Technology Inc.
    Inventor: Nadarajah Narendran