Patents Assigned to Heraeus Quarzglas GmbH & Co., KG
  • Patent number: 11884571
    Abstract: A process for producing a fluorinated quartz glass is described, including providing an SiO2 soot body; reacting the SiO2 soot body with a fluorinating agent having a boiling point of greater than or equal to ?10° C. to obtain a fluorinated SiO2 soot body; and vitrifying the fluorinated SiO2 soot body.
    Type: Grant
    Filed: August 6, 2021
    Date of Patent: January 30, 2024
    Assignee: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Stefan Ochs, Martin Trommer, Thomas Kayser
  • Patent number: 11878937
    Abstract: Described is a process for the refinement of a quartz powder, comprising the step of separating microparticles of refractory minerals, in particular minerals containing rare earth metal compounds, from the quartz powder by an elutriation step.
    Type: Grant
    Filed: July 10, 2020
    Date of Patent: January 23, 2024
    Assignees: Heraeus Quarzglas GmbH & Co. KG, Heraeus Conamic UK Limited
    Inventors: Ian George Sayce, Michael Schindler, Fabian Schildt, Eduard Visnow
  • Patent number: 11834362
    Abstract: One aspect is a method for producing a multilayered silica glass body. The method involves producing a multilayered silica glass body in which a transparent silica glass layer is provided on the surface of a siliceous substrate made of a siliceous material. The method includes preparing the siliceous substrate, preparing a silica slurry in which silica particles are dispersed in a liquid, applying the silica slurry to the surface of the siliceous substrate, leveling the silica slurry applied to the surface of the siliceous substrate by applying vibration to the siliceous substrate, drying the leveled silica slurry, and vitrifying the dried silica slurry by heating to form a transparent silica glass layer. As a result, a transparent silica glass layer of uniform thickness is obtained at excellent yield, and a method for producing a multilayered silica glass body easily in a short time is provided.
    Type: Grant
    Filed: September 3, 2019
    Date of Patent: December 5, 2023
    Assignees: Heraeus Quarzglas GmbH & Co. KG, Shin-Etsu Quartz Products Co., Ltd.
    Inventors: Tatsuya Mori, Akihiko Sugama
  • Patent number: 11739019
    Abstract: An apparatus and related process for producing a high-strength weld between two glass components. Chucks clamp and move respective first ends of the glass components toward each other inside an enclosure, where the second ends are heated, softened, and welded together in a weld zone. The enclosure has layers of stacked quartz glass bricks and allows the weld zone to cool slowly and avoid stress. A propane quartz melting torch directs a flame inside the enclosure and toward the second ends as the glass components move toward each other. The flame softens the second ends and creates substantially smooth polished surfaces in the weld zone having an increased hydroxide content. At least 80% of the weld zone has a hydroxide content greater than about 10 ppm average in a 10 ?m depth from the surface and the tensile strength of the weld zone is above about 10 MPa.
    Type: Grant
    Filed: January 17, 2020
    Date of Patent: August 29, 2023
    Assignees: HERAEUS QUARTZ NORTH AMERICA LLC, HERAEUS QUARZGLAS GMBH & CO. KG
    Inventors: Oliver Ganz, Kenneth Robert Koch, Tim Alan Pontsler
  • Patent number: 11708290
    Abstract: One aspect relates to a process for the preparation of a quartz glass body, including providing a silicon dioxide granulate, wherein the silicon dioxide granulate was made from pyrogenic silicon dioxide powder and the silicon dioxide granulate has a BET surface area in a range from 20 to 40 m2/g, making a glass melt out of silicon dioxide granulate in an oven and making a quartz glass body out of at least part of the glass melt. The oven has at least a first and a further chamber connected to one another via a passage. The temperature in the first chamber is lower than the temperature in the further chambers. On aspect relates to a quartz glass body which is obtainable by this process. One aspect relates to a light guide, an illuminant and a formed body, which are each obtainable by further processing of the quartz glass body.
    Type: Grant
    Filed: August 4, 2020
    Date of Patent: July 25, 2023
    Assignee: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Matthias Otter, Walter Lehmann, Michael Hünermann, Nils Christian Nielsen, Nigel Robert Whippey, Boris Gromann, Abdoul-Gafar Kpebane, Matthias Söhn
  • Patent number: 11674755
    Abstract: In a known method for treating pourable, inorganic grain, a heated rotary tube is used that rotates about an axis of rotation and surrounds a treatment chamber that is divided into a plurality of treatment zones by means of separating elements. The grain is supplied to the treatment chamber at a grain inlet side and is transported, in a grain transport direction, to a grain outlet side and is exposed to a treatment gas in the process. In order, proceeding herefrom, to allow for reliable and reproducible thermal treatment of pourable inorganic grain, in particular SiO2 grain in the rotary kiln, in a manner having low and effective consumption of treatment gas, it is proposed for spent treatment gas to be suctioned out of a reaction zone of the treatment chamber, by a gas manifold that rotates about the longitudinal axis thereof.
    Type: Grant
    Filed: May 12, 2020
    Date of Patent: June 13, 2023
    Assignee: Heraeus Quarzglas GmbH & Co. KG
    Inventor: Matthias Söhn
  • Publication number: 20230063663
    Abstract: A method for homogenizing glass includes the method: providing a cylindrical blank composed of the glass having a cylindrical outer surface that extends along a longitudinal axis of the blank between a first end face and a second end face, forming a shear zone in the blank by softening a longitudinal section of the blank and subjecting it to a thermal-mechanical intermixing treatment, and displacing the shear zone along the longitudinal axis of the blank. The displacement of the shear zone along the longitudinal axis of the blank is superimposed by a simultaneous oscillating motion of the shear zone along the longitudinal axis of the blank. The first end of the blank is rotated at a first rotational speed and the second end of the blank is rotated at a second rotational speed. An oscillating motion of the shear zone is generated by periodically varying the first and/or second rotational speed.
    Type: Application
    Filed: October 27, 2022
    Publication date: March 2, 2023
    Applicant: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Stephan Thomas, Jan Vydra, Martin Trommer, Michael Huenermann, Andreas Langner, Walter Lehmann, Stefan Hengster, Klaus Becker
  • Publication number: 20220411310
    Abstract: Producing a molded body made of opaque quartz glass includes providing SiO2 grains obtained by comminuting quartz glass having a purity of at least 99.9 wt % SiO2, forming a slurry containing a suspension liquid and the SiO2 grains and which has a total solids content, wet grinding the SiO2 grains in the slurry so as to form ground SiO2 grain particles, forming a porous green body from the slurry, and sintering the porous green body. To provide a low cost quartz glass, the wet grinding of the SiO2 grains takes place at least temporarily in the presence of SiO2 nanoparticles, the proportion of which in the total solids content of the slurry is in the range of 0.1 wt % to 10 wt %, and the slurry has a solids content in the range of 76 to 80 wt % after addition of the SiO2 nanoparticles and after the wet grinding.
    Type: Application
    Filed: June 22, 2022
    Publication date: December 29, 2022
    Applicant: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Andreas GÖTZENDORFER, Gerrit SCHEICH, Nadine TSCHOLITSCH, Joerg HAMMERSCHMIDT, Miriam Sonja HÖNER
  • Patent number: 11535547
    Abstract: Known heating burners for producing a welded joint between components of quartz glass include a burner head in which at least one burner nozzle is formed, a burner-head cooling system for the temperature control of the burner head and a supply line connected to the burner nozzle for a fuel gas. Starting from this, to modify a heating burner in such a way that impurities in the weld seam between quartz-glass components to be connected are largely avoided, it is suggested that the burner head should include a base body of silver or of a silver-based alloy.
    Type: Grant
    Filed: February 16, 2021
    Date of Patent: December 27, 2022
    Assignee: Heraeus Quarzglas GmbH & Co. KG
    Inventor: Oliver Ganz
  • Patent number: 11512017
    Abstract: In known methods for producing a glass component, a void-containing intermediate product containing doped or non-doped SiO2 is inserted into a sheath tube composed of glass, which has a longitudinal axis and an inner bore, and is thermally treated therein. In order to subject the intermediate product to a thermal and/or reactive treatment that is reproducible and uniform in its effect from this starting point, it is proposed in one embodiment that into the sheath tube's inner bore a first gas-permeable gas diffuser is inserted which is displaceable along the sheath tube's longitudinal axis and is pressed against the intermediate product during the thermal treatment.
    Type: Grant
    Filed: February 28, 2020
    Date of Patent: November 29, 2022
    Assignee: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Jacqueline Plass, Dörte Schönfeld, Clemens Schmitt, Alexander Laaz, Andreas Langner, Gerhard Schötz, Walter Lehmann, Michael Hünermann, Stefan Weidlich, Jürgen Schäfer
  • Patent number: 11492282
    Abstract: One aspect relates to a process for the preparation of a quartz glass body. The process includes providing silicon dioxide particles, making a glass melt out of the silicon dioxide particles in an oven and making a quartz glass body out of at least part of the glass melt. The oven has a gas outlet through which gas is removed from the oven, wherein the dew point of the gas on exiting the oven through the gas outlet is less than 0° C. One aspect further relates to a quartz glass body which is obtainable by this process. One aspect further relates to a light guide, an illuminant and a formed body, which are each obtainable by further processing of the quartz glass body.
    Type: Grant
    Filed: December 16, 2016
    Date of Patent: November 8, 2022
    Assignee: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Nigel Robert Whippey, Boris Gromann, Matthias Söhn
  • Patent number: 11492285
    Abstract: One aspect relates to a process for the preparation of a quartz glass body including, providing a silicon dioxide granulate obtainable from a silicon dioxide powder, wherein the silicon dioxide granulate has a larger particle size than the silicon dioxide powder, making a 5 glass melt out of silicon dioxide granulate and making a quartz glass body out of at least part of the glass melt. The melting crucible has at least one inlet and at least one outlet. A least part of the glass melt is removed via the melting crucible outlet. One aspect further relates to a quartz glass body which is obtainable by this process. One aspect further relates to a light guide, an illuminant and a formed body, which are each obtainable by further processing 10 of the quartz glass body.
    Type: Grant
    Filed: December 16, 2016
    Date of Patent: November 8, 2022
    Assignee: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Matthias Otter, Walter Lehmann, Michael Hünermann, Nils Christian Nielsen, Mirko Wittrin, Markus Wilde
  • Publication number: 20220348490
    Abstract: Provided is a heat reflective member, which is prevented from braking even in a high-temperature environment. It generates no dust in use, and can be washed with a chemical liquid. The heat reflective member has a laminated structure in which quartz glass layers are formed on an upper surface and a lower surface of a siliceous sintered powder layer. The heat reflective member includes: an impermeable layer which is formed at a portion of the siliceous sintered powder layer at an end portion of the heat reflective member, which has a thickness at least larger than half of a thickness of the siliceous sintered powder layer, and through which a gas or a liquid is prevented from penetrating; and a buffer layer which is formed between the impermeable layer and the siliceous sintered powder layer, and which changes in density from the impermeable layer toward the sintered powder layer.
    Type: Application
    Filed: September 18, 2020
    Publication date: November 3, 2022
    Applicants: SHIN-ETSU QUARTZ PRODUCTS CO., LTD., YAMAGATA SHIN-ETSU QUARTZ CO., LTD., HERAEUS QUARZGLAS GMBH & CO. KG
    Inventors: Kazuhiro YAMAGUCHI, Daiki FUJITA, Yoshihiro HARADA, Toru SEGAWA, Tomonori WATANABE
  • Patent number: 11485671
    Abstract: A method for homogenizing glass includes the method: providing a cylindrical blank composed of the glass having a cylindrical outer surface that extends along a longitudinal axis of the blank between a first end face and a second end face, forming a shear zone in the blank by softening a longitudinal section of the blank and subjecting it to a thermal-mechanical intermixing treatment, and displacing the shear zone along the longitudinal axis of the blank. To enable a radial mixing within the shear zone in addition to the tangential mixing with the lowest possible time and energy input, starting from this method, cylindrical sections of the blank are adjacent to the shear zone on both sides, the first cylindrical section having a first central axis and the second cylindrical section having a second central axis, the first central axis and the second central axis being temporarily non-coaxial with each other.
    Type: Grant
    Filed: October 24, 2019
    Date of Patent: November 1, 2022
    Assignee: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Stephan Thomas, Jan Vydra, Martin Trommer, Michael Huenermann, Andreas Langner, Walter Lehmann, Stefan Hengster, Klaus Becker
  • Patent number: 11485669
    Abstract: In a known method for producing a quartz glass component, a crystal formation layer containing a crystallization promoter is produced on a coating surface of a base body of quartz glass. Starting therefrom, to provide a method for producing a quartz glass component of improved thermal strength and long-term stability which displays a comparatively small deformation particularly also in the case of rapid heating-up processes, it is suggested according to one aspect that a porous crystal formation layer containing amorphous SiO2 particles is produced with a mean thickness in the range of 0.1 to 5 mm, and that a substance which contains cesium and/or rubidium is used as the crystallization promoter.
    Type: Grant
    Filed: July 9, 2018
    Date of Patent: November 1, 2022
    Assignee: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Christian Schenk, Nadine Tscholitsch, Thomas Baier
  • Publication number: 20220324740
    Abstract: One aspect is a reflective member, which has a laminated structure in which transparent quartz glass members are formed on an upper surface and a lower surface of an opaque siliceous sintered powder layer. The opaque siliceous sintered powder layer has a thickness of 0.1 mm or more and a thickness distribution of ±0.05 mm or less. When a load is applied to each of the transparent quartz glass members on an upper surface and a lower surface of the laminated structure in a direction parallel to the laminated structure, the reflective member is fractured at a load of 5 N or more per square centimeter. The laminated structure includes a semi-transparent portion having a width of 0.01 mm or less, which has an intermediate opacity between an opacity of the opaque siliceous sintered powder layer and an opacity of each of the transparent quartz glass members.
    Type: Application
    Filed: August 17, 2020
    Publication date: October 13, 2022
    Applicants: SHIN-ETSU QUARTZ PRODUCTS CO., LTD., YAMAGATA SHIN-ETSU QUARTZ CO., LTD., HERAEUS QUARZGLAS GMBH & CO. KG
    Inventors: Toru SEGAWA, Kazuhiro YAMAGUCHI, Tomonori WATANABE, Daiki FUJITA
  • Patent number: 11459262
    Abstract: A known method for homogenizing glass includes the following steps: providing a cylindrical blank composed of the glass, having a cylindrical outer surface which extends between a first end face and a second end face, forming a shear zone in the blank by softening a longitudinal section of the blank and subjecting it to a thermal-mechanical intermixing treatment, and moving the shear zone along the longitudinal axis of the blank. To reduce the risk of cracks and fractures during homogenizing, it is proposed that a thermal radiation dissipator is used that at least partially surrounds the shear zone, the lateral dimension of which in the direction of the longitudinal axis of the blank is greater than the shear zone and smaller than the length of the blank, the thermal radiation dissipator being moved synchronously with the shear zone along the longitudinal axis of the blank.
    Type: Grant
    Filed: October 24, 2019
    Date of Patent: October 4, 2022
    Assignee: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Stephan Thomas, Jan Vydra, Martin Trommer, Michael Huenermann, Andreas Langner, Walter Lehmann, Stefan Hengster, Klaus Becker
  • Publication number: 20220306513
    Abstract: In a method of manufacturing a tube of quartz glass by molding a hollow cylinder having a wall thickness of at least 20 mm, the cylinder is continuously fed under rotation about a rotational axis into a heating zone at a relative feed rate VC, softened and radially expanded under the effect of a gas pressure. A tube strand is continuously formed and is withdrawn at a withdrawal rate VT. In order to mold thick-walled initial hollow cylinders of quartz glass into tubes with larger diameter, the gas pressure is used as an actuating variable of a diameter regulation for the tube outer diameter or for a geometrical correlated parameter thereof, and in a pressure build-up phase the gas pressure is gradually increased from a lower initial value to a higher final value, and that the following applies to the ratio of VC and VT:VT=VC±0.2·VC.
    Type: Application
    Filed: March 29, 2022
    Publication date: September 29, 2022
    Applicant: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Matthias SÖHN, Boris GROMANN, Eduard VISNOW
  • Publication number: 20220267188
    Abstract: Known methods of producing a three-dimensional glass object comprise the step of shaping of a glass fiber, wherein the glass fiber provided with a protective sheath is fed continuously to a heating source, the protective sheath is removed under the influence of heat, and the glass fiber is softened. In order to facilitate the production of filigree or optically distortion-free and transparent glass objects as much as possible, and also enable the adjustment of optical and mechanical properties with high spatial resolution, in one aspect the glass fiber has a protective sheath with a layer thickness in the range of 10 nm to 10 ?m.
    Type: Application
    Filed: April 30, 2020
    Publication date: August 25, 2022
    Applicant: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Miriam Sonja HÖNER, Achim HOFMANN
  • Patent number: 11390556
    Abstract: A diffuser material of synthetically produced, pore-containing quartz glass and a method for the manufacture of a molded body consisting fully or in part thereof. The diffuser material has a chemical purity of at least 99.9% SiO2, a cristobalite content of not more than 1%, and a density in the range of 2.0 to 2.18 g/cm3. Starting therefrom, to indicate a diffuser material which is improved with respect to diffuse reflectivity with Lambertian behavior over a wide wavelength range, high material homogeneity and UV radiation resistance, the quartz glass has a hydroxyl group content in the range of at least 200 wt. ppm and at least 80% of the pores have a maximum pore dimension of less than 20 ?m.
    Type: Grant
    Filed: February 13, 2017
    Date of Patent: July 19, 2022
    Assignee: HERAEUS QUARZGLAS GMBH & CO. KG
    Inventors: Gerrit Scheich, Frank Nuernberg, Andreas Goetzendorfer, Nadine Tscholitsch, Bernhard Franz, Ursula Klett, Matthew Donelon