Patents by Inventor Pushkar Tandon

Pushkar Tandon 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).

  • Optical fiber with low fictive temperature
    Patent number: 10696580
    Abstract: An optical fiber with low fictive temperature along with a system and method for making the optical fiber are provided. The system includes a reheating stage that heats the fiber along the process pathway to a temperature sufficient to lower the fictive temperature of the fiber by relaxing the glass structure and/or driving the glass toward a more nearly equilibrium state. The fiber is drawn from a preform, conveyed along a process pathway, cooled and subsequently reheated to increase the time of exposure of the fiber to temperatures conducive to lowering the fictive temperature of the fiber. The process pathway may include multiple reheating stages as well as one or more fiber-turning devices.
    Type: Grant
    Filed: November 13, 2018
    Date of Patent: June 30, 2020
    Assignee: Corning Incorporated
    Inventors: Dana Craig Bookbinder, Ming-Jun Li, Bruce Warren Reding, Pushkar Tandon
  • Fiber coatings with low pullout force
    Patent number: 10689544
    Abstract: Fiber coatings with low Young's modulus, low fiber pullout force for fibers in the as-drawn state, and small time-dependent increases in pullout force as the fiber ages. The fiber coatings are cured products of coating compositions that include an oligomer formed from an isocyanate, a hydroxy acrylate compound and a polyol. The oligomer includes a polyether urethane acrylate and a di-adduct compound. The reaction mixture used to form the oligomer includes a molar ratio of isocyanate:hydroxy acrylate:polyol of n:m:p, where when p is 2, n is in the range from 3.0 to 5.0 and m is in the range from 1.50n-3 to 2.50n-5. Control of the n:m:p ratio leads to compositions that, when cured, provide coatings and cured products having low Young's modulus, low pullout force on glass, and weak variations with time as the fiber ages.
    Type: Grant
    Filed: May 1, 2019
    Date of Patent: June 23, 2020
    Assignee: Corning Incorporated
    Inventors: John William Botelho, Ching-Kee Chien, Jill Ann Cummings, Pushkar Tandon, Ruchi Tandon
  • LOW BEND LOSS OPTICAL FIBER WITH STEP INDEX CORE
    Publication number: 20200158945
    Abstract: A single mode optical fiber, comprising: (i) a silica based core having a step refractive index profile with an alpha of greater than 10, a relative refractive index ?1MAX, and an outer radius r1, wherein 6.25 microns>r1?4.75 microns, the core further comprising Cl, Ge, or a combination thereof; (ii) a first cladding region in contact with and surrounding the core, the first cladding region having a relative refractive index ?2MIN, an inner radius r1, and an outer radius r2, wherein r2<20 microns; and (iii) an outer cladding region surrounding the first cladding region, the outer cladding region having a relative refractive index ?3. The fiber <1300 nm, a 22 m cable cutoff wavelength <1260 nm; and a bend loss <0.005 dB/turn when the optical fiber is bent around a 30 mm mandrel; <0.5 dB/turn when the fiber is bent around a 20 mm mandrel.
    Type: Application
    Filed: November 16, 2018
    Publication date: May 21, 2020
    Inventors: Scott Robertson Bickham, Dana Craig Bookbinder, Ming-Jun Li, Snigdharaj Kumar Mishra, Pushkar Tandon
  • LOW BEND LOSS OPTICAL FIBER WITH A CHLORINE DOPED CORE AND OFFSET TRENCH
    Publication number: 20200150336
    Abstract: An optical fiber includes (i) a chlorine doped silica based core having a core alpha (Core?)?4, a radius r1, and a maximum refractive index delta ?1max % and (ii) a cladding surrounding the core. The cladding surrounding the core includes a) a first inner cladding region adjacent to and in contact with the core and having a refractive index delta ?2, a radius r2, and a minimum refractive index delta ?2min such that ?2min<?1max, b) a second inner cladding adjacent to and in contact with the first inner cladding having a refractive index ?3, a radius r3, and a minimum refractive index delta ?3min such that ?3min<?2, and c) an outer cladding region surrounding the second inner cladding region and having a refractive index ?5, a radius rmax, and a minimum refractive index delta ?3min such that ?3min<?2.
    Type: Application
    Filed: January 14, 2020
    Publication date: May 14, 2020
    Inventors: Dana Craig Bookbinder, Ming-Jun Li, Snigdharaj Kumar Mishra, Pushkar Tandon
  • Rollable optical fiber ribbon with low attenuation, large mode field diameter optical fiber and cable
    Patent number: 10649163
    Abstract: A rollable optical fiber ribbon utilizing low attenuation, bend insensitive fibers and cables incorporating such rollable ribbons are provided. The optical fibers are supported by a ribbon body, and the ribbon body is formed from a flexible material such that the optical fibers are reversibly movable from an unrolled position to a rolled position. The optical fibers have a large mode filed diameter, such as ?9 microns at 1310 nm facilitating low attenuation splicing/connectorization. The optical fibers are also highly bend insensitive, such as having a macrobend loss of ?0.5 dB/turn at 1550 nm for a mandrel diameter of 15 mm.
    Type: Grant
    Filed: August 6, 2018
    Date of Patent: May 12, 2020
    Assignee: CORNING RESEARCH & DEVELOPMENT CORPORATION
    Inventors: Dana Craig Bookbinder, Ming-Jun Li, Pushkar Tandon
  • Low attenuation optical fiber cable with small sized active particles
    Patent number: 10620393
    Abstract: A low attenuation optical cable is provided. The cable includes an outer cable jacket and at least one buffer tube surrounded by the cable jacket. The cable includes a plural number of optical fibers located within the channel of the at least one buffer tube. The cable includes small sized active particles located within the buffer tube, and an average maximum outer dimension of the active particles within the buffer tube is ?50 microns. The small sized active particles reduce microbending-based attenuation otherwise seen with larger sized active particles, particularly within densely packed buffer tubes.
    Type: Grant
    Filed: May 30, 2019
    Date of Patent: April 14, 2020
    Assignee: Corning Optical Communications LLC
    Inventors: Dana Craig Bookbinder, Anne Germaine Bringuier, Donald Kennedy Hall, Inna Igorevna Kouzmina, Ming-Jun Li, David Alan Seddon, Pushkar Tandon, Ruchi Tandon
  • Laser cut composite glass article and method of cutting
    Patent number: 10611668
    Abstract: The present disclosure relates to a process for cutting and separating arbitrary shapes of thin substrates of transparent materials, particularly tailored composite fusion drawn glass sheets, and the disclosure also relates to a glass article prepared by the method. The developed laser method can be tailored for manual separation of the parts from the panel or full laser separation by thermally stressing the desired profile. The self-separation method involves the utilization of an ultra-short pulse laser that can be followed by a CO2 laser (coupled with high pressure air flow) for fully automated separation.
    Type: Grant
    Filed: April 25, 2017
    Date of Patent: April 7, 2020
    Assignee: Corning Incorporated
    Inventors: Dana Craig Bookbinder, Stephan Lvovich Logunov, Sasha Marjanovic, Albert Roth Nieber, Garrett Andrew Piech, Kamjula Pattabhirami Reddy, Pushkar Tandon, Sergio Tsuda, Natesan Venkataraman, Robert Stephen Wagner
  • Method and system for forming perforations
    Patent number: 10611667
    Abstract: The embodiments disclosed herein relate to methods, systems, and system components for creating and arranging small (micron and smaller) defects or perforations in transparent materials in a particular manner, and, more particularly, to the arrangement of these defects, each of which has an average crack length, in a predetermined spaced-apart relation (each defect separated from an adjacent defect by a predetermined distance) defining a contour in a transparent material to lower the relative interface fracture toughness for subsequent planned induced separation.
    Type: Grant
    Filed: July 14, 2015
    Date of Patent: April 7, 2020
    Assignee: Corning Incorporated
    Inventors: Dana Craig Bookbinder, Stephan Lvovich Logunov, Albert Roth Nieber, Pushkar Tandon, Sergio Tsuda
  • HALOGEN DOPED OPTICAL FIBERS
    Publication number: 20200087195
    Abstract: A method of forming an optical fiber preform includes: flowing a silicon halide and an oxidizer inside of a substrate tube, wherein a molar ratio of the silicon halide to the oxidizer is from about 1.5 to about 5.0; applying a plasma to the substrate tube to heat the substrate tube to a temperature of from about 1000° C. to about 1700° C.; and depositing silica glass comprising a halogen inside the substrate tube.
    Type: Application
    Filed: September 12, 2019
    Publication date: March 19, 2020
    Inventors: Steven Bruce Dawes, Pushkar Tandon
  • WIDEBAND MULTIMODE CO-DOPED OPTICAL FIBER EMPLOYING GeO2 AND Al2O3 DOPANTS
    Publication number: 20200088935
    Abstract: The wideband multimode co-doped optical fiber has a silica core co-doped with GeO2 and Al2O3. The GeO2 concentration is maximum at the fiber centerline and monotonically decreases radially out to the core radius. The Al2O3 concentration is minimum at the centerline and monotonically increases radially out to maximum concentration at the core radius. The cladding has an inner cladding region of relative refractive index ?2, an intermediate cladding region having a relative refractive index ?3, and an outer cladding region having a relative refractive index ?4, wherein ?3<?2, ?4. The optical fiber has a bandwidth BW?5 GHz·km with a peak wavelength ?P within a wavelength range of 800 nm to 1200 nm and over a wavelength band ?? of at least 100 nm.
    Type: Application
    Filed: September 5, 2019
    Publication date: March 19, 2020
    Inventors: Dana Craig Bookbinder, Ming-Jun Li, Pushkar Tandon
  • Low bend loss optical fiber with a chlorine doped core and offset trench
    Patent number: 10591668
    Abstract: An optical fiber includes (i) a chlorine doped silica based core having a core alpha (Core?)?4, a radius r1, and a maximum refractive index delta ?1 max% and (ii) a cladding surrounding the core. The cladding surrounding the core includes a) a first inner cladding region adjacent to and in contact with the core and having a refractive index delta ?2, a radius r2, and a minimum refractive index delta ?2 min such that ?2 min<?1 max, b) a second inner cladding adjacent to and in contact with the first inner cladding having a refractive index ?3, a radius r3, and a minimum refractive index delta ?3 min such that ?3 min<?2, and c) an outer cladding region surrounding the second inner cladding region and having a refractive index ?5, a radius rmax, and a minimum refractive index delta ?3 min such that ?3 min<?2.
    Type: Grant
    Filed: July 25, 2018
    Date of Patent: March 17, 2020
    Assignee: Corning Incorporated
    Inventors: Dana Craig Bookbinder, Ming-Jun Li, Snigdharaj Kumar Mishra, Pushkar Tandon
  • METHODS AND APPARATUSES FOR CURING OPTICAL FIBER COATINGS
    Publication number: 20200062643
    Abstract: An optical fiber curing component includes a tube having a body defining an interior surface and an exterior surface. The tube defines a first aperture and a second aperture on opposite ends of a cavity. The tube defines a central axis extending through the cavity. A plurality of light sources is coupled to the body of the tube and configured to emit light toward the central axis of the tube. Each of the light sources intersect a common plane defined perpendicular to the central axis of the tube. A reflective coating is positioned on the interior surface of the body and configured to reflect the light toward the central axis of the tube.
    Type: Application
    Filed: August 12, 2019
    Publication date: February 27, 2020
    Inventors: Dana Craig Bookbinder, Darren Andrew Stainer, Pushkar Tandon, Ruchi Tandon
  • FIBER COATINGS WITH LOW PULLOUT FORCE
    Publication number: 20200064546
    Abstract: An optical fiber includes an outer diameter less than 220 ?m, a glass fiber that includes a glass core and a glass cladding, a primary coating, and a secondary coating. The glass cladding surrounds and is in direct contact with the glass core. The primary coating surrounds and is in direct contact with the glass fiber. The primary coating can have a Young's modulus less than 0.5 MPa and a thickness less than 30.0 ?m. The secondary coating surrounds and is in direct contact with the primary coating. The secondary coating can have a thickness less than 27.5 m. A pullout force of the optical fiber can be less than a predetermined threshold when in an as-drawn state. The pullout force may increase by less than a factor of 2.0 upon aging the primary and secondary coatings on the glass fiber for at least 60 days.
    Type: Application
    Filed: November 4, 2019
    Publication date: February 27, 2020
    Inventors: Ching-Kee Chien, Pushkar Tandon, Ruchi Tandon
  • Low loss optical fiber with core codoped with two or more halogens
    Patent number: 10571628
    Abstract: A co-doped optical fiber is provided having an attenuation of less than about 0.17 dB/km at a wavelength of 1550 nm. The fiber includes a core in the fiber having a graded refractive index profile with an alpha of greater than 5. The fiber also includes a cladding in the fiber that surrounds the core addition, the core includes silica that is co-doped with two or more halogens.
    Type: Grant
    Filed: November 16, 2018
    Date of Patent: February 25, 2020
    Assignee: Corning Incorporated
    Inventors: Dana Craig Bookbinder, Steven Bruce Dawes, Ming-Jun Li, Pushkar Tandon
  • Low bend loss optical fiber with graded index core
    Patent number: 10564349
    Abstract: A single mode optical fiber, comprising: (i) a silica based core having a graded refractive index profile with an alpha of less than 5, a relative refractive index ?1max, and an outer radius r1, wherein 10 microns>r1?6.5 microns, the core comprising Cl, Ge, or a combination thereof; (ii) a first cladding region in contact with and surrounding the core, the first cladding region having a relative refractive index ?2min, an inner radius r1, and an outer radius r2, wherein r2<20 microns; and (iii) an outer cladding region surrounding the first cladding region, the outer cladding region having a relative refractive index ?3. The fiber has MFD at 1310 nm>than 9 microns, a zero dispersion wavelength <1306 nm; a 22 m cable cutoff wavelength <1260nm; and a bend loss <0.005 dB/turn when the fiber is bent around a 30 mm mandrel; and <0.5dB/turn when the fiber is bent around a 20 mm mandrel.
    Type: Grant
    Filed: November 16, 2018
    Date of Patent: February 18, 2020
    Assignee: CORNING INCORPORATED
    Inventors: Scott Robertson Bickham, Dana Craig Bookbinder, Ming-Jun Li, Snigdharaj Kumar Mishra, Pushkar Tandon
  • HALOGEN CO-DOPED OPTICAL FIBERS
    Publication number: 20200049881
    Abstract: A method of forming an optical fiber, including: exposing a soot core preform to a dopant gas at a pressure of from 1.5 atm to 40 atm, the soot core preform comprising silica, the dopant gas comprising a first halogen doping precursor and a second halogen doping precursor, the first halogen doping precursor doping the soot core preform with a first halogen dopant and the second halogen precursor doping the soot core preform with a second halogen dopant; and sintering the soot core preform to form a halogen-doped closed-pore body, the halogen-doped closed-pore body having a combined concentration of the first halogen dopant and the second halogen dopant of at least 2.0 wt %.
    Type: Application
    Filed: August 1, 2019
    Publication date: February 13, 2020
    Inventors: Dana Craig Bookbinder, Steven Bruce Dawes, Phong Diep, Brian Lee Harper, Pushkar Tandon
  • HALOGEN-DOPED SILICA PREFORMS FOR OPTICAL FIBERS
    Publication number: 20200048136
    Abstract: Preparation of halogen-doped silica is described. The preparation includes doping silica with high halogen concentration and sintering halogen-doped silica to a closed-pore state in a gas-phase environment that has a low partial pressure of impermeable gases. Impermeable gases are difficult to remove from halogen-doped fiber preforms and lead to defects in optical fibers drawn from the preforms. A low partial pressure of impermeable gases in the sintering environment leads to a low concentration of impermeable gases and a low density of gas-phase voids in densified halogen-doped silica. Preforms with fewer defects result.
    Type: Application
    Filed: August 1, 2019
    Publication date: February 13, 2020
    Inventors: Dana Craig Bookbinder, Steven Bruce Dawes, Richard Michael Fiacco, Brian Lee Harper, Pushkar Tandon
  • PATTERN-PLUGGED HONEYCOMB BODIES, PARTICULATE FILTERS, AND EXTRUSION DIES THEREFOR
    Publication number: 20190374896
    Abstract: A honeycomb body having intersecting porous walls which includes first through fourth cells, wherein the cells extend from inlet to outlet face and are plugged to define a repeating structural unit with three inlets and one outlet channel. Repeating structural unit includes a first channel including length L1, width W2, and area A1, a second channel including length L2, the width W2, and area A2, a third channel including the length L1, width W1, and area A3, and a fourth channel including the length L2, the width W1, and A4, wherein the first through third channels are inlets and the fourth channel is a rectangular outlet and at least one of W1>W2 and L1?L2, i.e. W1>W2, or L1?L2, or W1>W2 and L1?L2. Repeating structural unit has a quadrilateral outer perimeter. Particulate filters including the honeycomb body, honeycomb extrusion dies, and methods of manufacturing the honeycomb body are provided.
    Type: Application
    Filed: January 31, 2018
    Publication date: December 12, 2019
    Inventors: Douglas Munroe Beall, Dana Craig Bookbinder, Pushkar Tandon
  • Method of applying an ink layer onto an optical fiber
    Patent number: 10501370
    Abstract: An optical fiber and its manufacture are provided. The optical fiber includes an optical waveguide and a cured primary coating layer surrounding the optical waveguide. The optical fiber further includes a cured secondary coating layer surrounding the cured primary coating layer. The optical fiber further includes a cured tertiary ink coating layer surrounding the cured secondary coating layer. The cured tertiary ink coating layer has a glass transition temperature (Tg-ink) of greater than or equal to 75° C.
    Type: Grant
    Filed: November 8, 2018
    Date of Patent: December 10, 2019
    Assignee: Corning Incorporated
    Inventors: Dana Craig Bookbinder, Robert Clark Moore, Darren Andrew Stainer, Pushkar Tandon, Ruchi Tandon, Michael James Todt
  • HIGH CHLORINE CONTENT LOW ATTENUATION OPTICAL FIBER
    Publication number: 20190369325
    Abstract: An optical fiber having a core comprising silica and greater than 1.5 wt % chlorine and less than 0.5 wt % F, said core having a refractive index ?1MAX, and an inner cladding region having refractive index ?2MIN surrounding the core, where ?1MAX>?2MIN.
    Type: Application
    Filed: August 19, 2019
    Publication date: December 5, 2019
    Inventors: George Edward Berkey, Dana Craig Bookbinder, Ming-Jun Li, Pushkar Tandon