Patents by Inventor Achim Hofmann

Achim Hofmann 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: 10343954
    Abstract: The invention relates to gas generating compositions for use in safety devices for vehicles. In particular, the invention relates to said compositions based on guanidine nitrate used in pedestrian protection devices. The composition substantially comprises 75 to 98% by weight of guanidine nitrate as fuel and 2 to 25% by weight of a burn accelerator selected from the group of the transition metal compounds, the metal nitrates, metal chlorates, metal perchlorates, ammonium perchlorate and mixtures thereof, wherein the transition metal compounds are selected from the compounds of the transition metals Ti, Cr, Mn, Fe, Cu, Zn, Zr and Mo and wherein the gas generating composition exhibits a burn rate of from 3 to 17 mm/s at 20 MPa.
    Type: Grant
    Filed: July 9, 2015
    Date of Patent: July 9, 2019
    Assignee: TRW AIRBAG SYSTEMS GMBH
    Inventors: Jorg Friedrich, Achim Hofmann, Karl-Heinz Rodig, Siegfried Zeuner
  • Publication number: 20190127226
    Abstract: A process for the production of a porous carbon product. The process includes the steps of (a) providing a substrate surface; (b) depositing silicon dioxide as a layer on the substrate surface, thereby obtaining a porous silicon di-oxide material; (c) contacting the porous silicon dioxide material on the substrate surface with a first carbon source thereby obtaining a first precursor comprising the porous silicon dioxide material and the first car-bon source; (d) heating the first precursor thereby obtaining a second precursor comprising the porous silicon dioxide material and carbon; and (e) at least partially removing the silicon dioxide in the second precursor, thereby obtaining the porous carbon product. Also disclosed are a porous carbon product and a device that uses a porous carbon product.
    Type: Application
    Filed: October 24, 2018
    Publication date: May 2, 2019
    Inventors: Achim Hofmann, Michael Hünermann, Dominik Samuelis, Martin Trommer, Frank Wessely
  • Publication number: 20190062198
    Abstract: One aspect relates to a light guide comprising a jacket and one or more cores, wherein the jacket surrounds the cores. Each core has a refractive index profile perpendicular to the maximum extension of the core, wherein at least one refractive index nK of each refractive index profile is greater than the refractive index nM1 of the jacket. The jacket is made of silicon dioxide and has an OH content of less than 10 ppm, a chlorine content of less than 60 ppm, and an aluminium content of less than 200 ppb. One aspect also relates to a silicon dioxide granulate I, characterized by a chlorine content of less than 200 ppm and an aluminium content of less than 200 ppb, in each case based on the total weight of the silicon dioxide granulate I.
    Type: Application
    Filed: December 16, 2016
    Publication date: February 28, 2019
    Applicant: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Michael HÜNERMANN, Achim HOFMANN, Heinz FABIAN, Matthias OTTER, Thomas KAYSER
  • Publication number: 20190055150
    Abstract: One aspect relates to a process for the preparation of a quartz glass body, including providing a silicon dioxide granulate composed of a pyrogenic silicon dioxide powder, making a glass melt out of the silicon dioxide granulate and making a quartz glass body out of at least part of the glass melt. The quartz glass body has an OH content of less than 10 ppm, a chlorine content of less than 60 ppm and an aluminium content of less than 200 ppb. One aspect also relates to a quartz glass body which is obtainable by this process. Furthermore, one aspect relates to a formed body and a structure, each of which is obtainable by further processing of the quartz glass body.
    Type: Application
    Filed: December 16, 2016
    Publication date: February 21, 2019
    Applicant: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Heinz FABIAN, Achim HOFMANN, Michael HÜNERMANN, Matthias OTTER, Thomas KAYSER
  • Patent number: 10029938
    Abstract: A method for producing synthetic quartz glass by fusion of SiO2 granulate involves synthesizing amorphous SiO2 primary particles, granulating the amorphous SiO2 primary particles to form an open-pore SiO2 granulate, sintering the open-pore SiO2 granulate by heating in a sintering atmosphere at a sintering temperature and for a sintering period to form a densified SiO2 granulate, and melting the densified SiO2 granulate at a melting temperature to form the synthetic quartz glass. To provide an inexpensive production of low-bubble transparent components of quartz glass despite the use of still open-pore SiO2 granulate, the sintering atmosphere, sintering temperature and sintering duration are adjusted such that the densified SiO2 granulate still comprises open pores but manifests a material-specific infrared transmission T1700 at a wavelength of 1700 nm. This transmission is in the range of 50-95% of the infrared transmission T1700 of quartz glass granules of the same material.
    Type: Grant
    Filed: September 24, 2015
    Date of Patent: July 24, 2018
    Assignee: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Achim Hofmann, Thomas Kayser, Matthias Otter, Bodo Kühn
  • Patent number: 10024577
    Abstract: Common solar radiation receivers are equipped with a chamber for transmission of an operating gas which is directed along to an absorber for solar radiation for thermal absorption. The absorber has a dome-shaped entry window made of quartz glass, wherein the inner side facing the absorber assumes a nominal interior temperature Ti of at least 950° C. during proper use, preferably at least 1000° C., whereas the outer side facing away from the absorber is exposed to the environment and subject to risk of devitrification. The invention relates to modifying the known solar radiation receiver so that a high absorber temperature can be set and thus a high efficiency of the solar thermal heating is enabled, without increasing the risk of devitrification in the region of the outer side of the entry window.
    Type: Grant
    Filed: September 13, 2012
    Date of Patent: July 17, 2018
    Assignee: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Klaus Becker, Achim Hofmann, Michael Hünermann, Christian Schenk
  • Publication number: 20180154858
    Abstract: The invention relates to an inflatable airbag (1) for protecting a person (5), comprising a flexible cover (10) which includes at least two finger-type extensions (11), wherein the flexible cover (10) delimits a dosed gas expansion compartment (12) by the finger-type extensions (11). The invention excels by the fact that the finger-type extensions (11) are arranged relative to each other such that in an inflated state the airbag (1) takes a three-dimensional shape and in the inflated state the finger-type extensions (11) at least in portions delimit a clearance (13), wherein the cover (10) is deferrable for absorbing impact energy while deforming, especially reducing, the clearance (13).
    Type: Application
    Filed: June 28, 2016
    Publication date: June 7, 2018
    Inventors: Daniele Aranzulla, Martin Burkhardtsmaier, Achim Hofmann
  • Patent number: 9840224
    Abstract: An inflator for a protective device in a vehicle includes a diffuser (10) forming a substantially rotation-symmetric external housing of the locator with a closing member (12), wherein the diffuser (10) includes a plurality of discharge orifices (78) arranged in a row, and which are of circular shape. The inflator also includes a circumferential wall (16, 22) which surrounds a combustion chamber (44) and a filter (46) which extends at least partially along the wall (16, 22), wherein the wall (16, 22) has at least one supporting portion (124) which constitutes an axial support for the filter (46) and is integrally formed with the wall (16, 22), and wherein either plural supporting portions (124) are formed by embossed beads, the heads being spaced apart from each other in circumferential direction, and wherein a supporting portion (124) is formed by a completely circumferential embossed bead.
    Type: Grant
    Filed: November 3, 2015
    Date of Patent: December 12, 2017
    Assignee: TRW Airbag Systems GmbH
    Inventors: Sebastian Bierwirth, Achim Hofmann, Hans-Peter Neumayer, Dieter Spitzenberger, Hannes Nuiding, Thomas Schober, Josef Bommer, Tobias Breddermann, Dietmar Schwebel
  • Publication number: 20170341617
    Abstract: An inflator as well as a method of manufacturing an inflator, a module including an inflator and an airbag module. In an inflator, especially for a protective device in a vehicle, comprising plural components a sealant is applied in the area of abutting components, especially a sealant which adheres to both abutting components.
    Type: Application
    Filed: August 15, 2017
    Publication date: November 30, 2017
    Inventors: Sebastian Bierwirth, Achim Hofmann, Hans-Peter Neumayer, Dieter Spitzenberger, Franz Fuerstenberger, Hannes Nuiding, Dieter Leier, Georg Schoenhuber, Joerg Friedrich
  • Patent number: 9815431
    Abstract: An inflator for a protective device in a vehicle includes a diffuser (10) forming a substantially rotation-symmetric external housing of the inflator with a closing member (12), wherein the diffuser (10) includes a plurality of discharge orifices (78) arranged in a row, and which are of circular shape. The inflator also includes an igniter sleeve (38) which at least partially encloses an igniter (34) and an igniter chamber (42) filled with a booster charge and is adjacent to a first combustion chamber (44) filled with fuel, wherein the igniter sleeve (38), related to a central axis B of the igniter sleeve (38), has overflow orifices (98) unevenly distributed in circumferential direction.
    Type: Grant
    Filed: November 3, 2015
    Date of Patent: November 14, 2017
    Assignee: TRW AIRBAG SYSTEMS GmbH
    Inventors: Sebastian Bierwirth, Achim Hofmann, Hans-Peter Neumayer, Dieter Spitzenberger, Hannes Nuiding, Thomas Schober, Josef Bommer, Tobias Breddermann, Dietmar Schwebel
  • Publication number: 20170174170
    Abstract: The invention relates to an inflatable airbag (1) for the protection of a person comprising a flexible sheath (10) which comprises at least two fingerlike extensions (11), wherein the flexible sheath (10) delimits a closed gas expansion chamber by the fingerlike extensions (11). The invention excels by the fact that the fingerlike extensions (11) are connected, especially stitched, glued or welded, to each other so that in an inflated state the airbag (1) takes a three-dimensional shape. The invention further relates to an airbag module, a vehicle occupant restraint system as well as vehicle parts comprising such airbag.
    Type: Application
    Filed: April 30, 2015
    Publication date: June 22, 2017
    Inventors: Daniele Aranzulla, Achim Hofmann
  • Patent number: 9643564
    Abstract: An inflator for a protective device in a vehicle includes a diffuser (10) forming a substantially rotation-symmetric external housing of the inflator with a closing member (12), wherein the diffuser (10) includes a plurality of discharge orifices (78) arranged in a row, and which are of circular shape. The inflator also includes a combustion chamber sleeve (60) which at least partially encloses a combustion chamber (56) filled with fuel, wherein the combustion chamber sleeve (60) is designed such that it changes its shape by pressure formed during combustion of the fuel so as to release a discharge orifice (112) leading out of the combustion chamber (56) into a further combustion chamber (44) of the inflator, for a combustion gas formed during combustion of the fuel.
    Type: Grant
    Filed: November 3, 2015
    Date of Patent: May 9, 2017
    Assignee: TRW Airbag Systems GmbH
    Inventors: Sebastian Bierwirth, Achim Hofmann, Hans-Peter Neumayer, Dieter Spitzenberger, Hannes Nuiding, Thomas Schober, Josef Bommer, Tobias Breddermann, Dietmar Schwebel
  • Patent number: 9580348
    Abstract: The production of a quartz glass grit comprises the granulation of pyrogenetically produced silicic acid, and the formation of a SiO2 granulate and the vitrification of the SiO2 granulate using a treatment gas, which contains at least 30% by volume of helium and/or hydrogen. Said process is time consuming and cost intensive.
    Type: Grant
    Filed: April 17, 2013
    Date of Patent: February 28, 2017
    Assignee: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Walter Lehmann, Achim Hofmann, Thomas Kayser, Martin Arndt
  • Patent number: 9511738
    Abstract: An inflator for a protective device in a vehicle includes a diffuser (10) forming a substantially rotation-symmetric external housing of the inflator with a closing member (12), wherein the diffuser (10) includes a plurality of discharge orifices (78) arranged in a row, and which are of circular shape. The inflator also includes a filter (46) and a combustion chamber component at least partially enclosing at least one of a combustion chamber (56) and a combustion chamber sleeve (60), wherein the filter (46) extends in a ring-shaped manner about the combustion chamber (56) and, at a position of its ring-shaped extension, includes a critical filter portion (120) which is closer to the combustion chamber component than the remaining filter areas situated at its ring-shaped extension, wherein the critical filter portion (120) has a reduced thickness compared to areas of the filter that are adjacent to the critical filter portion (120).
    Type: Grant
    Filed: November 3, 2015
    Date of Patent: December 6, 2016
    Assignee: TRW Airbag Systems GmbH
    Inventors: Sebastian Bierwirth, Achim Hofmann, Hans-Peter Neumayer, Dieter Spitzenberger, Hannes Nuiding, Thomas Schober, Josef Bommer, Tobias Breddermann, Dietmar Schwebel
  • Patent number: 9452729
    Abstract: An inflator, especially for a protective device in a vehicle, includes a diffuser (10) which preferably forms a substantially rotation-symmetric external housing of the inflator with a closing member (12). The diffuser (10) includes more than 12, preferably more than 14, further preferably 23 discharge orifices (78) arranged in a row. Moreover, the inflator exhibits a plurality of further peculiarities.
    Type: Grant
    Filed: September 27, 2011
    Date of Patent: September 27, 2016
    Assignee: TRW Airbag Systems GmbH
    Inventors: Sebastian Bierwirth, Achim Hofmann, Hans-Peter Neumayer, Dieter Spitzenberger, Hannes Nuiding, Thomas Schober, Josef Bommer, Tobias Breddermann, Dietmar Schwebel
  • Patent number: 9393929
    Abstract: A vehicle safety system includes a module including an airbag and an inflator. The inflator includes a housing (12) in which a combustion chamber (16) containing a pyrotechnic propellant is arranged in which hot gas is generated and which housing includes at least one escape orifice (22) toward the environment of the inflator (10), as well as a coolant reservoir (24) arranged in the housing (12) in which coolant is accommodated prior to activation of the inflator (10) and which has at least one coolant outlet orifice (28?). The coolant outlet orifice (28) is arranged in direct vicinity of the outlet orifice (22). Upon activation of the inflator (10) coolant flows out of the inflator into the protection system and wets an adjacent wall (32) of the protection system against which also the hot gas is flowing.
    Type: Grant
    Filed: May 15, 2014
    Date of Patent: July 19, 2016
    Assignee: TRW Airbag Systems GmbH
    Inventors: Manfred Biebl, Michael Gabler, Achim Hofmann, Dieter Leier, Ning Wei
  • Publication number: 20160168005
    Abstract: A method for producing a large quartz-glass pipe is provided. In a first forming step, an intermediate cylinder made of quartz glass and having an intermediate-cylinder wall thickness and outside diameter is formed by using a forming tool and is then cooled. In a second shaping step, at least one length segment of the cooled intermediate cylinder is fed to a heating zone, heated to a softening temperature zone by zone therein, and, while rotating about the longitudinal axis of the intermediate cylinder, shaped into the large quartz-glass pipe having a final wall thickness and outside diameter. The quartz glass is synthetically produced and has an average hydroxyl group content of 10 ppm by weight or less. If the intermediate cylinder is divided into length segments of 1 cm, adjacent length segments have a difference of less than 2 ppm by weight in the average hydroxyl group content thereof.
    Type: Application
    Filed: July 8, 2014
    Publication date: June 16, 2016
    Applicant: Heraeus Quarzglas GmbH & Co., KG
    Inventors: Boris GROMANN, Burtchard OBERLE, Christian SCHENK, Gero FISCHER, Pèlagie DECLERCK, Bemhard FRANZ, Ulrich LEIN, Alexander LAAZ, Achim HOFMANN
  • Publication number: 20160090319
    Abstract: A method for producing synthetic quartz glass by fusion of SiO2 granulate involves synthesizing amorphous SiO2 primary particles, granulating the amorphous SiO2 primary particles to form an open-pore SiO2 granulate, sintering the open-pore SiO2 granulate by heating in a sintering atmosphere at a sintering temperature and for a sintering period to form a densified SiO2 granulate, and melting the densified SiO2 granulate at a melting temperature to form the synthetic quartz glass. To provide an inexpensive production of low-bubble transparent components of quartz glass despite the use of still open-pore SiO2 granulate, the sintering atmosphere, sintering temperature and sintering duration are adjusted such that the densified SiO2 granulate still comprises open pores but manifests a material-specific infrared transmission T1700 at a wavelength of 1700 nm. This transmission is in the range of 50-95% of the infrared transmission T1700 of quartz glass granules of the same material.
    Type: Application
    Filed: September 24, 2015
    Publication date: March 31, 2016
    Inventors: Achim HOFMANN, Thomas KAYSER, Matthias OTTER, Bodo KÜHN
  • Publication number: 20160052485
    Abstract: An inflator for a protective device in a vehicle includes a diffuser (10) forming a substantially rotation-symmetric external housing of the locator with a dosing member (12), wherein the diffuser (10) includes a plurality of discharge orifices (78) arranged in a row, and which are of circular shape. The inflator also includes a circumferential wall (18, 22) which surrounds a combustion chamber (44) and a filter (46) which extends at least partially along the wall (16, 22), wherein the wall (16, 22) has at least one supporting portion (124) which constitutes an axial support for the filter (46) and is integrally formed with the wall (16, 22), and wherein either plural supporting portions (124) are formed by embossed beads, the heads being spaced apart from each other in circumferential direction, and wherein a supporting portion (124) is formed by a completely circumferential embossed bead.
    Type: Application
    Filed: November 3, 2015
    Publication date: February 25, 2016
    Inventors: Sebastian Bierwirth, Achim Hofmann, Hans-Peter Neumayer, Dieter Spitzenberger, Hannes Nuiding, Thomas Schober, Josef Bommer, Tobias Breddermann, Dietmar Schwebel
  • Publication number: 20160052484
    Abstract: An inflator for a protective device in a vehicle includes a diffuser (10) forming a substantially rotation-symmetric external housing of the inflator with a closing member (12), wherein the diffuser (10) includes a plurality of discharge orifices (78) arranged in a row, and which are of circular shape. The inflator also includes a filter (46) and a combustion chamber component at least partially enclosing at least one of a combustion chamber (56) and a combustion chamber sleeve (60), wherein the filter (46) extends in a ring-shaped manner about the combustion chamber (56) and, at a position of its ring-shaped extension, includes a critical filter portion (120) which is closer to the combustion chamber component than the remaining filter areas situated at its ring-shaped extension, wherein the critical filter portion (120) has a reduced thickness compared to areas of the filter that are adjacent to the critical filter portion (120).
    Type: Application
    Filed: November 3, 2015
    Publication date: February 25, 2016
    Inventors: Sebastian Bierwirth, Achim Hofmann, Hans-Peter Neumayer, Dieter Spitzenberger, Hannes Nuiding, Thomas Schober, Josef Bommer, Tobias Breddermann, Dietmar Schwebel