Patents Examined by John Hoffmann
  • Patent number: 10131566
    Abstract: Methods for modifying multi-mode optical fiber manufacturing processes are disclosed. In one embodiment, a method for modifying a process for manufacturing multi-mode optical fiber includes measuring at least one characteristic of a multi-mode optical fiber. The at least one characteristic is a modal bandwidth or a differential mode delay at one or more wavelengths. The method further includes determining a measured peak wavelength of the multi-mode optical fiber based on the measured characteristic, determining a difference between the target peak wavelength and the measured peak wavelength, and modifying the process for manufacturing multi-mode optical fiber based on the difference between the target peak wavelength and the measured peak wavelength.
    Type: Grant
    Filed: April 16, 2014
    Date of Patent: November 20, 2018
    Assignee: Corning Incorporated
    Inventors: Jennifersue A. Bowker, Xin Chen, Jason Edward Hurley, Elios Klemo, Igor Rafaelyevich Mejouev, Daniel Aloysius Nolan, Dale Robert Powers
  • Patent number: 9926218
    Abstract: A glass sheet forming system (10) has two parallel forming lines (12) that can utilize any two of three forming stations (18) to provide versatility in use for forming different glass sheet jobs of different sizes and shapes while reducing switchover time from one job to the next.
    Type: Grant
    Filed: November 2, 2015
    Date of Patent: March 27, 2018
    Assignee: GLASSTECH, INC.
    Inventor: James P. Schnabel, Jr.
  • Patent number: 9919947
    Abstract: When a GRIN lens fiber is drawn from a preform, control of a fiber diameter is improved in order to increase a production yield of the GRIN lens fiber having a fiber diameter within a desired range. The problem is solved by controlling the drawing speed using a fiber diameter c, which is obtained by correcting a fiber diameter a using the fiber diameter b and a fiber diameter ?. The fiber diameter a is measured using a diameter measuring instrument A that measures an outer diameter of the GRIN lens fiber, which is being elongated inside a heating furnace, the fiber diameter b is measured using a diameter measuring instrument B that measures an outer diameter of the GRIN lens fiber outside the heating furnace, and the fiber diameter ? is a value of the fiber diameter a measured a specified period of time T earlier.
    Type: Grant
    Filed: March 30, 2009
    Date of Patent: March 20, 2018
    Assignee: TOYO SEIKAN GROUP HOLDINGS, LTD.
    Inventor: Toshiaki Fukuda
  • Patent number: 9873629
    Abstract: Methods for forming optical fiber preforms with low-index trenches are disclosed. According to one embodiment, the method includes depositing silica-based glass soot on a bait rod to form a low-index trench region of the optical fiber preform. The silica-based glass soot is deposited such that the low-index trench region has a first density. Thereafter a barrier layer having a second density greater than the first density is formed around the low-index trench region. Therafter, an overclad region is deposited around the barrier layer. The bait rod is then removed from a central channel of the trench-overclad assembly. A separate core assembly is inserted into the central channel. A down-dopant gas is then directed through the central channel of the trench-overclad assembly as the trench-overclad assembly is heated to dope the low-index trench region. The barrier layer prevents diffusion of the down-dopant from the low-index trench region into the overclad region.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: January 23, 2018
    Assignee: Corning Incorporated
    Inventors: Steven Bruce Dawes, Robert A Knowlton, Pushkar Tandon, Ji Wang
  • Patent number: 9790121
    Abstract: Methods of fabricating a glass ribbon comprise the step of bending a glass ribbon in a cutting zone to provide a bent target segment with a bent orientation in the cutting zone. The methods further include the step of severing at least one of the edge portions from the central portion of the bent target segment within the cutting zone. Further methods are provided including the step of bending a glass ribbon in a bending zone downstream from a downward zone, wherein the glass ribbon includes an upwardly concave surface through the bending zone. The methods further include the step of severing at least one of the edge portions from the central portion of a target segment within the bending zone.
    Type: Grant
    Filed: July 13, 2011
    Date of Patent: October 17, 2017
    Assignee: Corning Incorporated
    Inventors: Anatoli Anatolyevich Abramov, James William Brown, Chester Hann Huei Chang, Sean Matthew Garner, Xinghua Li
  • Patent number: 9688564
    Abstract: A method of elongating a glass base material to obtain a glass rod having a smaller diameter, using a glass base material elongating apparatus including a feeder at least for the glass base material, a heating furnace, and an elongating mechanism of the glass base material below the heating furnace, is such that a horizontal plane position measuring unit of the glass base material is provided inside or near the heating furnace, the feeder has a glass base material horizontal plane position adjusting unit, and the elongating mechanism has three or more sets of elongating rollers capable of switching between grasping and releasing for keeping the position of the glass rod in the horizontal plane to be constant, and the glass base material is elongated with the position thereof in the horizontal plane kept as targeted by controlling the glass base material horizontal plane position adjusting unit.
    Type: Grant
    Filed: February 29, 2012
    Date of Patent: June 27, 2017
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventor: Tetsuya Otosaka
  • Patent number: 9688561
    Abstract: The invention relates to a method of making a mineral melt comprising providing a circulating combustion chamber (1) which comprises an upper zone (2), a lower zone (3) and a base zone (4), injecting particulate fuel, particulate mineral material and primary combustion gas which has optionally an oxygen level of at least 25% by volume into the upper zone of the circulating combustion chamber so that the fuel undergoes pyrolysis in the upper zone to produce char, thereby melting the particulate mineral materials to form a mineral melt and generating exhaust gases, injecting secondary combustion gas which has optionally an Oxygen level of at least 25% by volume into the lower zone of the circulating combustion chamber so that the char combusts, thereby completing combustion of the fuel, and separating the mineral melt from the hot exhaust gases so that the hot exhaust gases pass though an outlet in the circulating combustion chamber and the mineral melt collects in the base zone.
    Type: Grant
    Filed: January 14, 2008
    Date of Patent: June 27, 2017
    Assignee: ROCKWOOL INTERNATIONAL A/S
    Inventors: Lars Elmekilde Hansen, Lars Boellund, Lars Kresten Hansen, Peter Farkas Binderup Hansen, Leif Moeller Jensen
  • Patent number: 9643879
    Abstract: A method for manufacturing a precursor for a primary preform for optical fibers by an internal plasma deposition process including the steps of providing a hollow substrate tube, creating a first plasma reaction zone having first reaction conditions and depositing non-vitrified silica layers along at least a portion of the inner surface of the substrate tube, subsequently creating a second plasma reaction zone having second reaction conditions different from the first reaction conditions and depositing vitrified silica layers along at least a portion of the substrate tube, and cooling the substrate tube to produce the precursor for a primary preform.
    Type: Grant
    Filed: June 24, 2014
    Date of Patent: May 9, 2017
    Assignee: Draka Comteq B.V.
    Inventors: Igor Milicevic, Mattheus Jacobus Nicolaas Van Stralen, Johannes Antoon Hartsuiker, Gertjan Krabshuis
  • Patent number: 9611164
    Abstract: The invention relates to a process and to an installation for preparing a final glass, comprising a main furnace with electrodes and/or overhead burners, which is fed with main batch materials generating a main molten glass, and a submerged-combustion auxiliary furnace, said auxiliary furnace being fed with auxiliary batch materials, the auxiliary molten glass feeding the main furnace toward its upstream end in the first third of its length, the auxiliary glass being substantially of the same composition as the main glass. The downstream zone of the main furnace is thus used to remove both gases coming from the main glass and gases coming from the auxiliary glass, in order to finish melting the batch stones and impurities contained in the auxiliary glass and to homogenize the two glass streams from their redox standpoint, when this is necessary.
    Type: Grant
    Filed: March 19, 2008
    Date of Patent: April 4, 2017
    Assignees: SAINT-GOBAIN GLASS FRANCE, SAINT-GOBAIN ISOVER
    Inventors: Pierre Jeanvoine, Stephane Maugendre
  • Patent number: 9481599
    Abstract: A method of making a multimode optical fiber is disclosed. In one embodiment the method includes calculating a core radius that maximizes the bandwidth of the multimode optical fiber wherein the effect of draw tension is accounted for. The embodiments herein illustrate how core radius can be tuned so the time delay of the outermost guided mode group is reduced. The resultant core radius may be targeted for a value off-nominal from what would be expected for a particular commercial optical fiber type.
    Type: Grant
    Filed: December 20, 2011
    Date of Patent: November 1, 2016
    Assignee: CORNING INCORPORATED
    Inventors: Scott Robertson Bickham, Oleksandr Kogan, Ming-Jun Li, Snigdharaj Kumar Mishra, Pushkar Tandon
  • Patent number: 9199868
    Abstract: Isopipes (13) for making a glass or a glass-ceramic using a fusion process are provided. The isopipes are made from an alumina material which has a higher static fatigue than existing alumina materials intended for use as isopipes. In particular, the alumina materials have times-to-failure (static fatigues) of greater than one hour at 1200° C. at an applied stress of 10,000 psi. These high levels of static fatigue allow alumina isopipes to replace zircon isopipes in the manufacture of high performance glass sheets by the fusion process, including glass sheets which are incompatible with zircon isopipes but compatible with alumina isopipes, e.g., chip and scratch resistant glass sheets which have high alkali contents.
    Type: Grant
    Filed: July 11, 2011
    Date of Patent: December 1, 2015
    Assignee: Corning Incorporated
    Inventors: Thomas D. Ketcham, Joseph J. McIntosh, Steven M. Milillo, Eunyoung Park
  • Patent number: 9051205
    Abstract: Disclosed is a method and device for manufacturing an optical preform. The method includes supplying dopant-containing glass-forming gases to the interior of a hollow glass substrate tube. Furthermore, the supply flow of dopant-containing glass-forming gases includes a main gas flow and one or more secondary gas flows. The secondary gas flows are divided into subflows, which are supplied to the interior of the hollow glass substrate tube together with the main gas flow. The method further includes effecting deposition of glass layers on the interior surface of the hollow glass substrate tube.
    Type: Grant
    Filed: December 19, 2009
    Date of Patent: June 9, 2015
    Assignee: Draka Comteq, B.V.
    Inventors: Igor Milicevic, Mattheus Jacobus Nicolaas van Stralen, Johannes Antoon Hartsuiker, Roland Gerhardus Jacobus Maria Heuvelmans
  • Patent number: 8869561
    Abstract: A device for the refining of a glass melt at high temperatures according to the skull pot principle is provided. The device includes a skull crucible having walls that are constructed from a plurality of pipes, a high-frequency coil for coupling electrical energy into the contents of the skull crucible, and an inlet and an outlet of the skull crucible being arranged in a melt surface region of the glass melt, wherein the inlet and the outlet are essentially arranged lying opposite one another.
    Type: Grant
    Filed: February 12, 2010
    Date of Patent: October 28, 2014
    Assignee: Schott AG
    Inventors: Erich Rodek, Wolfgang Schmid-Bauer, Hilgegard Römer, Günter Weidmann, Werner Kiefer
  • Patent number: 8863556
    Abstract: The invention provides techniques for drawing fibers that include conducting, semiconducting, and insulating materials in intimate contact and prescribed geometries. The resulting fiber exhibits engineered electrical and optical functionalities along extended fiber lengths. The invention provides corresponding processes for producing such fibers, including assembling a fiber preform of a plurality of distinct materials, e.g., of conducting, semiconducting, and insulating materials, and drawing the preform into a fiber.
    Type: Grant
    Filed: October 3, 2007
    Date of Patent: October 21, 2014
    Assignee: Massachusetts Institute of Technology
    Inventors: Mehmet Bayindir, Fabien Sorin, Dursen S. Hinczewski, Shandon D. Hart, Yoel Fink, John D Joannopoulos
  • Patent number: 8826693
    Abstract: An apparatus and method for heat treating a plurality of glass substrates. The glass substrates are supported on support platform and housed in a heat treating furnace. The substrates are supported in a substantially vertical orientation by restraining pins extending through walls of the furnace, and are separated from each other by frame-shaped spacing members. The spacing members reduce convection currents between the substrates and reduce or eliminate the post-heat treating distortion of each glass substrate to less than 100 ?m over the entire surface of the substrate.
    Type: Grant
    Filed: August 30, 2010
    Date of Patent: September 9, 2014
    Assignee: Corning Incorporated
    Inventors: Frank T. Coppola, Monica J. Mashewske
  • Patent number: 8806900
    Abstract: Several versions of ceramic bushing/s consisting local heating element/s integrated in apparatus for manufacturing mineral/basalt fibers from natural basalt rocks have been designed based on alternatives to Pt/Pt-Rd bushings approach. The ceramic bushing/s having local heating element/s concept promotes minimization or complete replacement of platinum group metals from the process of continuous basalt fiber manufacturing. More specifically, the invention discloses ceramic bushing/s comprising in combination apparatus are designed for manufacturing continuous mineral (basalt) fibers from 7 to 20 micrometers (?m), and also the coarse fibers from 20 ?m to 100 micrometers (?m) in amorphous structural state which exhibit flexible/ductile properties.
    Type: Grant
    Filed: March 30, 2006
    Date of Patent: August 19, 2014
    Assignee: Reforcetech AS
    Inventor: Alexesy V. Brik
  • Patent number: 8800323
    Abstract: An optical fiber which, at an optical fiber connecting end having a plurality of voids around the periphery of a core, has a light-permeable substance, such as a resin or glass whose refractive index is lower than that of quartz type substances, filled in the voids adjacent to the connecting end. An optical fiber connecting section where an optical fiber having a plurality of voids in a clad around the periphery of a core is connected to another optical fiber, wherein the optical fiber is connected end-to-end to aforesaid another optical fiber through a refractive index matching agent whose refractive index at the minimum temperature in actual use is lower than that of the core.
    Type: Grant
    Filed: March 5, 2008
    Date of Patent: August 12, 2014
    Assignees: Hitachi Metals, Ltd., Nippon Telegraph and Telephone Corporation
    Inventors: Yoshinori Kurosawa, Bing Yao, Kazumasa Ohsono, Masao Tachikura, Hisanori Nakai, Toshio Kurashima, Eiji Araki, Katumi Hiramatu
  • Patent number: 8794038
    Abstract: The invention relates to a multimode optical fiber having a refractive index profile, comprising a light-guiding core surrounded by one or more cladding layers. The present invention furthermore relates to an optical communication system comprising a transmitter, a receiver and a multimode optical fiber.
    Type: Grant
    Filed: August 4, 2008
    Date of Patent: August 5, 2014
    Assignee: Draka Comteq, B.V.
    Inventors: Pieter Matthuse, Mattheus Jacobus Nicolaas Van Stralen, Mark Peter Marie Jetten, Gert-Jan Krabshuis
  • Patent number: 8789393
    Abstract: A porous layer is formed by depositing a silica glass particle around a core rod. The porous layer is dehydrated. The dehydrated porous layer is sintered under a decreased pressure until the dehydrated porous layer becomes a translucent glass layer containing a closed pore. The translucent glass layer is vitrified under an ambient atmosphere including an inert gas other than a helium gas.
    Type: Grant
    Filed: November 29, 2005
    Date of Patent: July 29, 2014
    Assignee: The Furukawa Electric Co., Ltd.
    Inventors: Nobuaki Orita, Akihiro Kanao, Hideya Moridaira
  • Patent number: 8769995
    Abstract: The present invention provides a method for making a multicore large diameter optical waveguide having a cross-section of at least about 0.3 millimeters, two or more inner cores, a cladding surrounding the two or more inner cores, and one or more side holes for reducing the bulk modulus of compressibility and maintaining the anti-buckling strength of the large diameter optical waveguide. The method features the steps of: assembling a preform for drawing a multicore large diameter optical waveguide having a cross-section of at least about 0.3 millimeters, by providing an outer tube having a cross-section of at least about 0.3 millimeters and arranging two or more preform elements in relation to the outer tube; heating the preform; and drawing the large diameter optical waveguide from the heated preform. In one embodiment, the method also includes the step of arranging at least one inner tube inside the outer tube.
    Type: Grant
    Filed: July 25, 2006
    Date of Patent: July 8, 2014
    Assignee: Weatherford/Lamb, Inc.
    Inventors: Edward M. Dowd, Joseph J. Baraglia, Andrew S. Kuczma, Brian J. Pike, Thomas W. Engel, Martin A. Putnam