Patents by Inventor Ferdinand Leifeld

Ferdinand Leifeld 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: 20210046668
    Abstract: The disclosure relates to a method for the production of wood fiberboards such as MDF boards.
    Type: Application
    Filed: February 12, 2019
    Publication date: February 18, 2021
    Inventors: Ferdinand Leifeld, Sabine Both, Achim Fessenbecker
  • Patent number: 10875944
    Abstract: A process for producing aqueous solutions of acrylic acid polymers by polymerization of acrylic acid in feed operation with a free-radical starter in the presence of hypophosphite in water as solvent, which comprises (i) initially charging water and optionally acrylic acid in acidic, unneutralized form, optionally one or more ethylenicaliy unsaturated comonomers, optionally aqueous hypophosphite solution and optionally initiator, (ii) adding acrylic acid in acidic, unneutralized form, optionally one or more ethylenicaliy unsaturated comonomers, aqueous free-radical starter solution and aqueous hypophosphite solution, (iii) adding a base to the aqueous solution after termination of the acrylic acid feed, wherein the comonomer content does not exceed 30 wt % based on the total monomer content, wherein the acrylic acid, the aqueous free-radical starter solution and the aqueous hypophosphite solution are added such that the molar ratio x of acrylic acid to phosphorus-bound hydrogen [AA]/[P—H] over a time period
    Type: Grant
    Filed: February 2, 2017
    Date of Patent: December 29, 2020
    Assignee: BASF SE
    Inventors: Johannes Barth, Gledison Fonseca, Dieter Faul, Martin Ernst, Juergen Detering, Ferdinand Leifeld, Gazi Tuerkoglu
  • Publication number: 20200299426
    Abstract: A process for producing aqueous solutions of acrylic acid polymers by polymerization of acrylic acid in feed operation with a free-radical starter in the presence of hypophosphite in water as solvent, which comprises (i) initially charging water and optionally acrylic acid in acidic, unneutralized form, optionally one or more ethylenicaliy unsaturated comonomers, optionally aqueous hypophosphite solution and optionally initiator, (ii) adding acrylic acid in acidic, unneutralized form, optionally one or more ethylenicaliy unsaturated comonomers, aqueous free-radical starter solution and aqueous hypophosphite solution, (iii) adding a base to the aqueous solution after termination of the acrylic acid feed, wherein the comonomer content does not exceed 30 wt % based on the total monomer content, wherein the acrylic acid, the aqueous free-radical starter solution and the aqueous hypophosphite solution are added such that the molar ratio x of acrylic acid to phosphorus-bound hydrogen [AA]/[P—H] over a time peri
    Type: Application
    Filed: February 2, 2017
    Publication date: September 24, 2020
    Inventors: Johannes Barth, Gledison Fonseca, Dieter Faul, Martin Ernst, Juergen Detering, Ferdinand Leifeld, Gazi Tuerkoglu
  • Publication number: 20200123707
    Abstract: A method of increasing the throughput and/or decreasing the energy usage of a pulping process includes the steps of providing a plurality of lignocellulosic chips, providing a refining composition, applying the refining composition to the plurality of lignocellulosic chips, and mechanically refining the plurality of lignocellulosic chips to form pulp. The refining composition includes water and a lubricating additive including the reaction product of a sugar and an alcohol. The step of applying the refining composition to the lignocellulosic chips is conducted less than 5 minutes prior to, or concurrently with, the step of mechanically refining the wood chips to form pulp.
    Type: Application
    Filed: June 12, 2018
    Publication date: April 23, 2020
    Inventors: John Andrew Randolph, Laurence J. Rys, Ferdinand Leifeld, Achim Fessenbecker
  • Publication number: 20190276568
    Abstract: An acrylic acid polymer having a weight average molecular weight Mw in the range from 3500 to 2000 g/mol and a polydispersity index Mw/Mn?2.5, wherein 30% to 60% of the acid groups of the acrylic acid polymers have been neutralized with calcium ions, 30% to 70% of the acrylic acid polymers have been neutralized with sodium ions and 0% to 10% of the acid groups of the acrylic acid polymers have not been neutralized.
    Type: Application
    Filed: October 24, 2017
    Publication date: September 12, 2019
    Inventors: Ferdinand Leifeld, Achim FESSENBECKER, Steffen HENKES, Massimiliano BORDIGNON, Vandana KURKAL-SIEBERT, Laszlo SZARVAS, Qing Feng TONG
  • Patent number: 10337144
    Abstract: Described is a method for processing cellulose-containing biomass with sulfuric acid and certain additives, especially for the pretreatment of cellulose-containing biomass prior to saccharification.
    Type: Grant
    Filed: February 18, 2016
    Date of Patent: July 2, 2019
    Assignee: BASF SE
    Inventors: Frank Rittig, Stefan Koch, Alois Kindler, Michael Koch, Ferdinand Leifeld, Vaidotas Navickas, Markus Gruen
  • Patent number: 10316106
    Abstract: Described is a method for processing cellulose-containing biomass with sulfuric acid and certain additives, especially for the pretreatment of cellulose-containing biomass prior to saccharification.
    Type: Grant
    Filed: February 18, 2016
    Date of Patent: June 11, 2019
    Assignee: BASF SE
    Inventors: Frank Rittig, Stefan Koch, Alois Kindler, Michael Koch, Ferdinand Leifeld, Vaidotas Navickas, Markus Gruen
  • Publication number: 20180051414
    Abstract: Described is a method for processing cellulose-containing biomass with sulfuric acid and certain additives, especially for the pretreatment of cellulose-containing biomass prior to saccharification.
    Type: Application
    Filed: February 18, 2016
    Publication date: February 22, 2018
    Applicant: BASF SE
    Inventors: Frank RITTIG, Stefan KOCH, Alois KINDLER, Michael KOCH, Ferdinand LEIFELD, Vaidotas NAVICKAS, Markus GRUEN
  • Publication number: 20180044438
    Abstract: Described is a method for processing cellulose-containing biomass with sulfuric acid and certain additives, especially for the pretreatment of cellulose-containing biomass prior to saccharification.
    Type: Application
    Filed: February 18, 2016
    Publication date: February 15, 2018
    Applicant: BASF SE
    Inventors: Frank RITTIG, Stefan KOCH, Alois KINDLER, Michael KOCH, Ferdinand LEIFELD, Vaidotas NAVICKAS, Markus GRUEN
  • Patent number: 6584651
    Abstract: A carding machine includes a main carding cylinder and a doffer to which fiber material is transferred from the main carding cylinder and a fiber removing device positioned downstream of the doffer as viewed in an advancing direction of the fiber material through the carding machine. A gathering device including at least one gathering roll is disposed downstream of the doffer for effecting a negative draft on the fiber material between the doffer and the gathering roll.
    Type: Grant
    Filed: May 1, 2001
    Date of Patent: July 1, 2003
    Assignee: Trutzschler GmbH Co. KG
    Inventors: Ferdinand Leifeld, Bernhard Rübenach
  • Publication number: 20010039695
    Abstract: A carding machine includes a main carding cylinder and a doffer to which fiber material is transferred from the main carding cylinder and a fiber removing device positioned downstream of the doffer as viewed in an advancing direction of the fiber material through the carding machine. A gathering device including at least one gathering roll is disposed downstream of the doffer for effecting a negative draft on the fiber material between the doffer and the gathering roll.
    Type: Application
    Filed: May 1, 2001
    Publication date: November 15, 2001
    Inventors: Ferdinand Leifeld, Bernhard Rubenach
  • Patent number: 6289599
    Abstract: An apparatus for measuring the thickness of a plurality of side-by-side running slivers includes a supporting surface guiding the side-by-side running slivers thereon in a single plane; a holding member; and a plurality of sensor elements movably secured to the holding member to be movable in a direction transverse to the plane. Each sliver is contacted by a separate sensor element for causing excursions thereof by thickness fluctuations of the running sliver. Each sensor element is yieldingly pressed against a respective sliver, and each sensor element cooperates with the supporting surface for pressing the running slivers against the supporting surface. An adding device adds the excursions of the sensor elements, and a transducer converts the excursion values into electric pulses.
    Type: Grant
    Filed: September 17, 1998
    Date of Patent: September 18, 2001
    Assignee: Trützschler GmbH & Co. KG
    Inventors: Ferdinand Leifeld, Josef Temburg
  • Patent number: 6249935
    Abstract: A fiber processing machine includes a rotatably supported clothed opening roll; a withdrawing roll adjoining the opening roll and supported for rotation for forwarding the fiber material to the opening roll; an optical sensor system for detecting foreign material carried on the opening roll along with fiber material; an air stream generating device for directing an air blast to the clothing of the opening roll; a control-and-regulating device to which the optical sensor system and the air stream generating device are connected for operating the air stream generating device upon detecting foreign material by the optical sensor system to remove and carry away the foreign material from the clothing of the opening roll by an air stream; and a collecting chamber for receiving the air stream carrying the foreign material.
    Type: Grant
    Filed: February 19, 1999
    Date of Patent: June 26, 2001
    Assignee: Trützschler GmbH & Co. KG
    Inventor: Ferdinand Leifeld
  • Patent number: 6223398
    Abstract: A textile fiber processing machine includes a device for forming a fiber web from a fiber lap; a device for advancing the fiber web to a web outputting device for discharging the web thereby in a direction of advance; and two cooperating calender rolls defining a nip receiving the web discharged by the web outputting device. The calender rolls are situated immediately adjacent the web outputting device downstream thereof as viewed in the direction of web advance. Further, a heating arrangement is provided for heating at least one of the calender rolls for thermo-bonding the web as it passes through the nip of the calender rolls.
    Type: Grant
    Filed: March 26, 1999
    Date of Patent: May 1, 2001
    Assignee: Trutzschler GmbH & Co., KG
    Inventor: Ferdinand Leifeld
  • Patent number: 6223609
    Abstract: An apparatus for advancing a sliver and sensing thickness variations thereof in a fiber processing machine includes a tongue-and-groove roll pair composed of a tongue roll and a groove roll. The groove roll is radially fixedly supported and has a circumferentially extending groove including a groove bottom. The tongue roll projects into the groove and defines, with the groove roll, a nip through which the sliver passes for being compressed and advanced by the tongue-and-groove roll pair. The apparatus further has a sensing device including a biased, movably supported sensor element projecting into the groove of the groove roll and cooperating with the groove bottom upstream of the nip as viewed in a direction of sliver advance for pressing the sliver against the groove bottom and for undergoing excursions in response to thickness variations of the sliver passing between the sensor element and the groove bottom.
    Type: Grant
    Filed: November 18, 1999
    Date of Patent: May 1, 2001
    Assignee: Trützschler GmbH & Co. KG
    Inventors: Ferdinand Leifeld, Pedro Corrales
  • Patent number: 6216318
    Abstract: A fiber processing machine for forming a fiber lap from fiber tufts, includes a fiber feeding assembly which has a feed roll having a rotary axis; a carrier element extending adjacent and along the feed roll; and a feed tray array cooperating with the feed roll for drawing fiber material into a nip defined between the feed tray array and the feed roll and for discharging the fiber material from the nip. The feed tray array is composed of a series of individual feed trays lined up along the feed roll. Individual, separate rotary supports for mounting each feed tray on the carrier element provide for a pivotal motion of each feed tray in a plane generally perpendicular to the rotary axis of the feed roll.
    Type: Grant
    Filed: September 2, 1999
    Date of Patent: April 17, 2001
    Assignee: Trützschler GmbH & Co. KG
    Inventor: Ferdinand Leifeld
  • Patent number: 6167593
    Abstract: A fiber processing machine for forming a fiber lap from fiber tufts includes a generally vertically oriented reserve chute, a generally vertically oriented feed chute having an inlet adjoining the outlet of the reserve chute, and a fiber feeding assembly drawing fiber from the reserve chute and advancing fiber into the feed chute. The fiber feeding assembly includes a generally horizontally oriented feed roll having a rotary axis extending parallel to the horizontal width of the reserve chute, and a feed tray array cooperating with the feed roll and being composed of a series of individual feed trays lined up along the feed roll and rotatable about an axis. Each feed tray defines a nip with the feed roll. Measuring elements are coupled to each feed tray for emitting signals representing an extent of excursion of the respective feed tray as the fiber material passes through the respective nip. A control and regulating device is connected to the measuring elements for receiving the signals therefrom.
    Type: Grant
    Filed: September 9, 1999
    Date of Patent: January 2, 2001
    Assignee: Tr{umlaut over (u)}tzschler GmbH & Co. KG
    Inventor: Ferdinand Leifeld
  • Patent number: 6163931
    Abstract: A feeding device for advancing fiber material includes a driven feed roll; a support element immovably held during operation and extending spaced from and generally parallel to the feed roll; and a feed tray assembly composed of a plurality of side-by-side positioned feed tray segments. Each feed tray segment is of a resilient material and has a first portion (end portion) immovably affixed to the support element and a movable, second portion having a surface oriented toward the feed roll and cooperating therewith for advancing the fiber material passing through a nip defined between the feed roll and each feed tray segment. The second portion of each feed tray segment is displaceable toward and away from the feed roll.
    Type: Grant
    Filed: November 30, 1999
    Date of Patent: December 26, 2000
    Assignee: Trutzschler GmbH & Co. KG
    Inventor: Ferdinand Leifeld
  • Patent number: 6119312
    Abstract: A device for guiding and compressing a sliver running through the device in a travel direction includes first and second guide elements adjoining one another in the travel direction. Each guide element has two opposite first sides and two opposite second sides. Each guide element is formed of two face-to-face disposed wall elements which are spaced from one another perpendicularly to the travel direction and which form the first sides of the guide element. The second sides of each guide element are open in a direction perpendicular to the travel direction. The first and second guide elements are offset at an angle with respect to one another as related to the travel direction.
    Type: Grant
    Filed: May 3, 1999
    Date of Patent: September 19, 2000
    Assignee: Trutzschler GmbH & Co. KG
    Inventor: Ferdinand Leifeld
  • Patent number: 6088882
    Abstract: A regulated drawing unit for drawing fiber material includes an inlet through which the fiber material passes before being drafted; an outlet through which the fiber material passes after being drafted; a first arrangement defining a drawing field including drawing roll pairs spaced from one another in a direction of advance of fiber material; a drive system operatively connected to at least one of the drawing roll pairs for setting an extent of draft of the drawing field; a programmable control system having a memory and being connected to the drive system; a sensor for determining the mass of the fiber material running through a location and for applying signals to the memory; and a second arrangement for deriving information from data stored in the memory for adjusting the roll pair. The second arrangement includes a third arrangement for forming, from the information, a spectrogram of the fiber material and for evaluating properties of the spectrogram to use such properties in adjusting the roll pair.
    Type: Grant
    Filed: June 30, 1998
    Date of Patent: July 18, 2000
    Assignee: Trutzschler GmbH & Co. KG
    Inventor: Ferdinand Leifeld