Patents by Inventor Ishwar D. Aggarwal

Ishwar D. Aggarwal 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: 20220227675
    Abstract: The present invention provides a method for making a high strength, small grain size ceramic having a transgranular fracture mode by rapid densification of a green body and subsequent cooling of the densified ceramic. The ceramic may include dislocations, defects, dopants, and/or secondary phases that are formed as a result of the process and resulting in stress fields capable of redirecting or arresting cracks within the material. This ceramic can maintain transparency from ultraviolet to mid-wave infrared.
    Type: Application
    Filed: April 8, 2022
    Publication date: July 21, 2022
    Inventors: Michael Hunt, Guillermo R. Villalobos, Benjamin Rock, Shyam S. Bayya, Woohong Kim, Ishwar D. Aggarwal, Bryan Sadowski, Jasbinder S. Sanghera
  • Patent number: 11299428
    Abstract: The present invention provides a method for making a high strength, small grain size ceramic having a trans-granular fracture mode by rapid densification of a green body and subsequent cooling of the densified ceramic. The ceramic may include dislocations, defects, dopants, and/or secondary phases that are formed as a result of the process and resulting in stress fields capable of redirecting or arresting cracks within the material. This ceramic can maintain transparency from ultraviolet to mid-wave infrared.
    Type: Grant
    Filed: April 27, 2017
    Date of Patent: April 12, 2022
    Assignee: The Government of the United States of America, as represented by the Secretary of the Navy
    Inventors: Michael Hunt, Guillermo R. Villalobos, Benjamin Rock, Shyam S. Bayya, Woohong Kim, Ishwar D. Aggarwal, Bryan Sadowski, Jasbinder S. Sanghera
  • Patent number: 11231525
    Abstract: The invention relates to methods for fabricating antireflective surface structures (ARSS) on an optical element using a seed layer of material deposited on the surface of the optical element. The seed layer is removed during or after the etching, and serves to control etching time as well as the transmission region of the optical element having ARSS. Optical elements having ARSS on at least one surface are also provided.
    Type: Grant
    Filed: November 14, 2017
    Date of Patent: January 25, 2022
    Assignee: The Government of the United States of America, as represented by the Secretary of the Navy
    Inventors: Lynda E. Busse, Jesse A. Frantz, Leslie Brandon Shaw, Jasbinder S. Sanghera, Ishwar D. Aggarwal, Menelaos K. Poutous
  • Patent number: 11130675
    Abstract: A nanoparticle containing monoclinic lutetium oxide. A method of: dispersing a lutetium salt solution in a stream of oxygen gas to form droplets, and combusting the droplets to form nanoparticles containing lutetium oxide. The combustion occurs at a temperature sufficient to form monoclinic lutetium oxide in the nanoparticles. An article containing lutetium oxide and having an average grain size of at most 10 microns.
    Type: Grant
    Filed: August 15, 2012
    Date of Patent: September 28, 2021
    Assignee: The Government of the United States of America, as represented by the Secretary of the Navy
    Inventors: Colin C. Baker, Woohong Kim, Guillermo R. Villalobos, Jasbinder S. Sanghera, Ishwar D. Aggarwal
  • Patent number: 11035984
    Abstract: The invention relates to methods for fabricating antireflective surface structures (ARSS) on an optical element using a three-dimensional film layer applied to the surface of the optical element. The methods beneficially permit materials that do not exhibit local variation in physical and chemical properties to be provided with ARSS. Optical elements having ARSS on at least one surface are also provided.
    Type: Grant
    Filed: December 7, 2017
    Date of Patent: June 15, 2021
    Assignee: The Government of the United States of America, as represented by the Secretary of the Navy
    Inventors: Jesse A. Frantz, Lynda E. Busse, L. Brandon Shaw, Jasbinder S. Sanghera, Ishwar D. Aggarwal, Menelaos K. Poutous
  • Publication number: 20210109256
    Abstract: A method for producing nanostructured, hydrophilic, transmissive, anti-reflective surfaces is described. The method for providing a hydrophilic surface includes steps of providing a substrate that is transmissive in at least one wavelength in the infrared to ultraviolet range of the electromagnetic spectrum and comprises at least one surface including nanostructures of a size smaller than the at least one wavelength; and functionalizing the at least one surface with hydroxyl groups thereon. This method provides devices having excellent transmittance and anti-reflectance properties and which are resistant to seawater.
    Type: Application
    Filed: December 22, 2020
    Publication date: April 15, 2021
    Inventors: Darryl A. Boyd, Jesse A. Frantz, Shyam S. Bayya, Lynda E. Busse, Jasbinder S. Sanghera, Woohong Kim, Ishwar D. Aggarwal
  • Patent number: 10948656
    Abstract: The present invention is generally directed to a device comprising multiple specialty glass optical fibers that combines several different mid-infrared optical signals from multiple optical fibers into one signal in a single optical fiber. In addition, the present invention provides for a method of making the device.
    Type: Grant
    Filed: December 22, 2009
    Date of Patent: March 16, 2021
    Assignee: The Government of the United States of America, as Represented by the Secretary of the Navy
    Inventors: Daniel J. Gibson, Leslie Brandon Shaw, Jasbinder S. Sanghera, Frederic H. Kung, Ishwar D. Aggarwal
  • Patent number: 10934172
    Abstract: A ?-SiC coating made by the method of mixing SiO2 with carbon and heating the mixture in vacuum wherein the carbon is oxidized to CO gas and reduces the SiO2 to SiO gas and reacting a carbon material, comprising stainless steel with a carbon coating, with the SiO gas at a temperature in the range of 1300 to 1600° C. resulting in a SiC coating on the stainless steel.
    Type: Grant
    Filed: May 26, 2017
    Date of Patent: March 2, 2021
    Assignee: The Government of the United States of America, as represented by the Secretary of the Navy
    Inventors: Guillermo R. Villalobos, Michael Hunt, Bryan Sadowski, Jasbinder S. Sanghera, Ishwar D. Aggarwal
  • Publication number: 20210048561
    Abstract: An antireflection optical element formed from an optical material. The optical material includes a first plurality of antireflective surface structures in the form of first protuberances from the optical material. The first plurality of antireflective surface structures are constructed to aid in transmission of a first wavelength range through the optical material. Also included are a second plurality of antireflective surface structures in the form second protuberances from the first plurality of antireflective surface structures. The second plurality of antireflective surface structures are constructed to aid in transmission a second wavelength range through the optical material. The first wavelength range comprises longer wavelengths than the second wavelength range.
    Type: Application
    Filed: August 14, 2020
    Publication date: February 18, 2021
    Inventors: Lynda E. Busse, Leslie B. Shaw, Jesse A. Frantz, Jasbinder S. Sanghera, Ishwar D. Aggarwal
  • Patent number: 10884188
    Abstract: A method for creating a random anti-reflective surface structure on an optical fiber including a holder configured to hold the optical fiber comprising a groove and a fiber connector, an adhesive material to hold the optical fiber in the holder and fill any gap between the optical fiber and the holder, a glass to cover the adhesive material and the optical fiber, and a reactive ion etch device. The reactive ion etch device comprises a plasma and is configured to expose an end face of the optical fiber to the plasma. The plasma is configured to etch a random anti-reflective surface structure on the end face of the optical fiber.
    Type: Grant
    Filed: May 14, 2020
    Date of Patent: January 5, 2021
    Assignee: The Government of the United States of America, as represented by the Secretary of the Navy
    Inventors: Jesse A. Frantz, Lynda E. Busse, Jason D. Myers, L. Brandon Shaw, Jasbinder S. Sanghera, Ishwar D. Aggarwal, Catalin M. Florea
  • Publication number: 20200271862
    Abstract: A method for creating a random anti-reflective surface structure on an optical fiber including a holder configured to hold the optical fiber comprising a groove and a fiber connector, an adhesive material to hold the optical fiber in the holder and fill any gap between the optical fiber and the holder, a glass to cover the adhesive material and the optical fiber, and a reactive ion etch device. The reactive ion etch device comprises a plasma and is configured to expose an end face of the optical fiber to the plasma. The plasma is configured to etch a random anti-reflective surface structure on the end face of the optical fiber.
    Type: Application
    Filed: May 14, 2020
    Publication date: August 27, 2020
    Inventors: Jesse A. Frantz, Lynda E. Busse, Jason D. Myers, L. Brandon Shaw, Jasbinder S. Sanghera, Ishwar D. Aggarwal, Catalin M. Florea
  • Patent number: 10689284
    Abstract: The present invention is directed to a method for making infrared transmitting graded index optical elements by selecting at least two different infrared-transmitting materials, each with a different refractive index, having similar thermo-viscous behavior; assembling the infrared-transmitting materials into a stack comprising one or more layers of each infrared-transmitting material resulting in the stack having a graded index profile; and forming the stack into a desired shape. Also disclosed is the related optical element made by this method.
    Type: Grant
    Filed: February 10, 2012
    Date of Patent: June 23, 2020
    Assignee: THE GOVERNMENT OF THE UNITED STATES, AS REPRESENTED BY THE SECRETARY OF THE NAVY
    Inventors: Daniel J. Gibson, Jasbinder S. Sanghera, Guillermo R. Villalobos, Ishwar D. Aggarwal, Dean A Scribner
  • Patent number: 10663667
    Abstract: A system and method for creating a random anti-reflective surface structure on an optical fiber including a holder configured to hold the optical fiber comprising a groove and a fiber connector, an adhesive material to hold the optical fiber in the holder and fill any gap between the optical fiber and the holder, a glass to cover the adhesive material and the optical fiber, and a reactive ion etch device. The reactive ion etch device comprises a plasma and is configured to expose an end face of the optical fiber to the plasma. The plasma is configured to etch a random anti-reflective surface structure on the end face of the optical fiber.
    Type: Grant
    Filed: November 9, 2018
    Date of Patent: May 26, 2020
    Assignee: The Government of the United States of America, as represented by the Secretary of the Navy
    Inventors: Jesse A. Frantz, Lynda E. Busse, Jason D. Myers, L. Brandon Shaw, Jasbinder S. Sanghera, Ishwar D. Aggarwal, Catalin M. Florea
  • Publication number: 20200059060
    Abstract: Fiber optic amplification includes a photonic crystal fiber coupled to a pump laser through a first coupler. The pump laser emits a first electromagnetic radiation wave into the photonic crystal fiber at a first oscillation frequency and a second electromagnetic radiation wave into the photonic crystal fiber at a second oscillation frequency equaling the first oscillation frequency. The first and second electromagnetic radiation waves interact to generate a signal comprising an electromagnetic radiation wave at a third oscillation frequency and an idler comprising a fourth electromagnetic radiation wave at a fourth oscillation frequency to be generated and amplified through parametric amplification. Parametric amplification is achieved by four wave mixing. The photonic crystal fiber emits a parametric output signal based on the four wave mixing. A nonlinear crystal frequency doubles the parametric output signal through second-harmonic generation.
    Type: Application
    Filed: August 20, 2019
    Publication date: February 20, 2020
    Inventors: L. Brandon Shaw, Rafael R. Gattass, Rajesh Thapa, Lynda E. Busse, Ishwar D. Aggarwal, Daniel L. Rhonehouse, Jasbinder S. Sanghera, Jason Auxier
  • Patent number: 10486977
    Abstract: A method of purifying a spinel powder includes contacting a spinel powder with an acid solution to form an acid-washed spinel composition and contacting the acid-washed spinel composition with a basic solution to form a purified composition. The purified powder is suited to formation of low-absorption shaped bodies, such as windows for high intensity laser devices.
    Type: Grant
    Filed: July 26, 2016
    Date of Patent: November 26, 2019
    Assignee: The Government of the United States of America, as represented by the Secretary of the Navy
    Inventors: Woohong Kim, Guillermo R. Villalobos, Colin C. Baker, Shyam S. Bayya, Michael Hunt, Bryan Sadowski, Ishwar D. Aggarwal, Jasbinder S. Sanghera
  • Publication number: 20190311889
    Abstract: A method for forming a high purity, copper indium gallium selenide (CIGS) sputtering target is disclosed. The method includes sealing precursor materials for forming the bulk material in a reaction vessel. The precursor materials include copper, at least one chalcogen selected from selenium, sulfur, and tellurium, and at least one element from group IIIA of the periodic table, which may be selected from gallium, indium, and aluminum. The sealed reaction vessel is heated to a temperature at which the precursor materials react to form the bulk material. The bulk material is cooled in the vessel to a temperature below the solidification temperature of the bulk material and opened to release the formed bulk material. A sputtering target formed by the method can have an oxygen content of 10 ppm by weight, or less.
    Type: Application
    Filed: May 22, 2019
    Publication date: October 10, 2019
    Inventors: Vinh Q. Nguyen, Jesse A. Frantz, Jasbinder S. Sanghera, Ishwar D. Aggarwal, Allan J. Bruce, Michael Cyrus, Sergey V. Frolov
  • Patent number: 10347473
    Abstract: A method for forming a high purity, copper indium gallium selenide (CIGS) bulk material is disclosed. The method includes sealing precursor materials for forming the bulk material in a reaction vessel. The precursor materials include copper, at least one chalcogen selected from selenium, sulfur, and tellurium, and at least one element from group IIIA of the periodic table, which may be selected from gallium, indium, and aluminum. The sealed reaction vessel is heated to a temperature at which the precursor materials react to form the bulk material. The bulk material is cooled in the vessel to a temperature below the solidification temperature of the bulk material and opened to release the formed bulk material. A sputtering target formed by the method can have an oxygen content of 10 ppm by weight, or less.
    Type: Grant
    Filed: September 17, 2010
    Date of Patent: July 9, 2019
    Assignees: The United States of America, as represented by the Secretary of the Navy, Sunlight Photonics Inc.
    Inventors: Vinh Q Nguyen, Jesse A. Frantz, Jasbinder S. Sanghera, Ishwar D. Aggarwal, Allan J. Bruce, Michael Cyrus, Sergey V. Frolov
  • Patent number: 10254169
    Abstract: The present invention provides an optical detector device, including: a metal absorber layer; and a dielectric cover layer coupled to the metal absorber layer, wherein the dielectric cover layer includes one or more antireflective structured surfaces. The optical detector device further includes one or more of a passive substrate layer and an active thermoelectric element layer coupled to the metal absorber layer opposite the dielectric cover layer. The one or more antireflective structured surfaces each utilize a random pattern.
    Type: Grant
    Filed: August 6, 2015
    Date of Patent: April 9, 2019
    Assignees: The Government of the United States of America, as represented by the Secretary of the Navy, The University of North Carolina at Charlotte
    Inventors: Menelaos K. Poutous, Ishwar D. Aggarwal, Jasbinder S. Sanghera, Lynda E. Busse, Brandon L. Shaw
  • Publication number: 20190094465
    Abstract: A system and method for creating a random anti-reflective surface structure on an optical fiber including a holder configured to hold the optical fiber comprising a groove and a fiber connector, an adhesive material to hold the optical fiber in the holder and fill any gap between the optical fiber and the holder, a glass to cover the adhesive material and the optical fiber, and a reactive ion etch device. The reactive ion etch device comprises a plasma and is configured to expose an end face of the optical fiber to the plasma. The plasma is configured to etch a random anti-reflective surface structure on the end face of the optical fiber.
    Type: Application
    Filed: November 9, 2018
    Publication date: March 28, 2019
    Inventors: Jesse A. Frantz, Lynda E. Busse, Jason D. Myers, L. Brandon Shaw, Jasbinder S. Sanghera, Ishwar D. Aggarwal, Catalin M. Florea
  • Publication number: 20190025470
    Abstract: A spinel-based optical element made by a method for reducing transmission losses in the spinel-based optical element by building a structure on the surface of the optical element without the use of a previously prepared master. The structure can be built through reactive ion etching (RIE) of a pattern obtained through photolithography and liftoff, through RIE of a pattern through e-beam writing and liftoff, through RIE of a pattern using a self organized metal mask, or by direct hot-pressing the structure during fabrication of the optical element.
    Type: Application
    Filed: September 27, 2018
    Publication date: January 24, 2019
    Inventors: Jasbinder S. Sanghera, Catalin M. Florea, Guillermo R. Villalobos, Ishwar D. Aggarwal, Bryan Sadowski