Patents by Inventor Stefan Woestmann

Stefan Woestmann 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: 20250196422
    Abstract: A filtering device for filtering a fluid, in particular a liquefied plastic, includes a housing having a receptacle for receiving a screen carrier and having a fluid inlet channel and a fluid outlet channel, a screen carrier movably received along a longitudinal axis inside the receptacle and having a screen carrier inlet, a screen carrier outlet and a cavity for receiving a filter element, wherein the cavity is in fluid communication with the screen carrier inlet and the screen carrier outlet, and the screen carrier can be moved from a screen replacement position via a venting position area into a filtering position. The screen carrier has a throttle recess which is arranged adjacent to the screen carrier outlet and is in fluid communication with the cavity, and which opens a variable flow cross-section between the cavity and the fluid outlet channel.
    Type: Application
    Filed: March 20, 2023
    Publication date: June 19, 2025
    Applicant: NORDSON CORPORATION
    Inventors: Stefan WOESTMANN, Markus WALBERSMANN, Robert MIDDLER
  • Publication number: 20240141455
    Abstract: A cold-rolled flat steel product has a tensile strength of 750-940 MPa, a high strength, an improved weldability and optimized shaping properties, and can be produced at low cost. The cold-rolled flat steel product consists of a steel composed, in percent by mass, of C: 0.040-0.100%; Mn: 2.10-2.50%; Si: 0.10-0.40%; Cr: 0.30-0.90%; Ti: 0.020-0.080%, B: 0.0005-0.0020%; N: 0.003-0.010%; Al: up to 0.10%; Ca: up to 0.005%; P: up to 0.025%; S: up to 0.010%; optionally one or more of the following elements: Mo: up to 0.20%; Nb: up to 0.050%; Cu: up to 0.10%; V: up to 0.020%; Ni: up to 0.10%, the remainder being iron and unavoidable impurities, and total content of impurities is limited to at most 0.5% by mass and contents of phosphorus (ā€œPā€) and sulfur (ā€œSā€) belong to the impurities.
    Type: Application
    Filed: March 3, 2022
    Publication date: May 2, 2024
    Inventors: Ekaterina Bocharova, Olga Sukhopar, Georg Paul, Stefan Woestmann
  • Patent number: 9504938
    Abstract: A filtering device (100) for high-viscosity fluids has a partial channel (34) in the housing (30) and a displacing piston (40) which can be inserted into the partial channel (34, 35). The displacing piston (40) has at least one inner fluid line (42) that extends from an inlet opening (41) therein to an outlet opening (43) on its circumference. The outer diameter of the displacing piston (40) corresponds to the inside diameter of the partial channel (34, 35). The displacing piston (40) can be positioned, in a production position, with its outlet opening (43) in front of the inlet of the discharge channel (33) into the partial channel (34, 35) and can be retracted to a backflushing initial position within the partial channel (34).
    Type: Grant
    Filed: March 13, 2012
    Date of Patent: November 29, 2016
    Assignee: NORDSON HOLDINGS S.A.R.L. & CO. KG
    Inventor: Stefan Woestmann
  • Publication number: 20140332460
    Abstract: A filtering device (100) for high-viscosity fluids has a partial channel (34) in the housing (30) and a displacing piston (40) which can be inserted into the partial channel (34, 35). The displacing piston (40) has at least one inner fluid line (42) that extends from an inlet opening (41) therein to an outlet opening (43) on its circumference. The outer diameter of the displacing piston (40) corresponds to the inside diameter of the partial channel (34, 35). The displacing piston (40) can be positioned, in a production position, with its outlet opening (43) in front of the inlet of the discharge channel (33) into the partial channel (34, 35) and can be retracted to a backflushing initial position within the partial channel (34).
    Type: Application
    Filed: March 13, 2012
    Publication date: November 13, 2014
    Applicant: KREYENBORG VERWALTUNGEN UND BETEILIGUNGEN GMBH & CO. KG
    Inventor: Stefan Woestmann
  • Publication number: 20140263021
    Abstract: A plate filtering device (10) for plastic melts has at least two stationary housing components (7, 9) with a movable plate (4) with a filter insert (5) disposed between them. A locking bushing (6) that extends up to the movable plate is placed at the downstream housing component (9), and its inner recess forms a part of the flow channel. A seal bushing (3) that can be pressed against the movable plate (4) and/or the filter insert (5) is located in movable fashion in the front housing component (7). A funnel area (3.2) is formed on the side facing away from the filter insert (5). A sealing ring (2) is located between the sealing bushing (3) and a retaining ring (1). The sealing ring exhibits at least one angled conical surface (2.1) and one face area (2.2) that is oriented at a right angle to the direction of fluid flow. At the seal bushing (3), an effective pressure area (3.1, 3.1?, 3.1?) that extends into the flow channel (8) is formed within the inner width of the sealing ring (2).
    Type: Application
    Filed: May 29, 2014
    Publication date: September 18, 2014
    Applicant: KREYENBORG GMBH
    Inventors: Stefan Woestmann, Jan-Udo Kreyenborg
  • Patent number: 8153012
    Abstract: The invention relates to a device for filtering a fluid, in particular a liquefied plastic, with a housing with backflush channel and screen carrier and filter element whereby, in order to accelerate and improve the backflush effect, one or more displacement cylinders are provided that guide material removed from the production at adjustable high pressure and speed to the screen to be cleaned from the clean screen side to the dirty screen side, whereby an additional pressure generator ensures constant process pressure.
    Type: Grant
    Filed: July 7, 2005
    Date of Patent: April 10, 2012
    Assignee: Kreyenborg Verwaltungen und Beteiligungen GmbH & Co. KG
    Inventors: Stefan Woestmann, Dirk Bussmann
  • Patent number: 8017010
    Abstract: A device for filtering a liquid synthetic material. The device has a housing, a feed channel, a discharge channel, and backflow channels. The feed duct is subdivided into split-feed channels (2A, 2B). The cross-section of the orifice of the split-feed channels, where they open into the filter chambers, is smaller than the normal cross-section of the feed channels.
    Type: Grant
    Filed: January 10, 2007
    Date of Patent: September 13, 2011
    Assignee: Kreyenborg Verwaltungen und Beteiligungen GmbH & Co., KG
    Inventor: Stefan Woestmann
  • Patent number: 8017002
    Abstract: The invention relates to an arrangement and a device for filtering a fluid, particularly for plastic processing plants, wherein the pressure drop, or the flow rate reduction, created by the withdrawal of material from the process is sensitively balanced in that pressure constancy and flow rate constancy are achieved at the discharge duct (3).
    Type: Grant
    Filed: July 6, 2007
    Date of Patent: September 13, 2011
    Assignee: Kreyenborg Verwaltungen und Beteiligungen GmbH & Co., KG
    Inventor: Stefan Woestmann
  • Publication number: 20110180472
    Abstract: A plate filtering device (10) for plastic melts has at least two stationary housing components (7, 9) with a movable plate (4) with a filter insert (5) disposed between them. A locking bushing (6) that extends up to the movable plate is placed at the downstream housing component (9), and its inner recess forms a part of the flow channel. A seal bushing (3) that can be pressed against the movable plate (4) and/or the filter insert (5) is located in movable fashion in the front housing component (7). A funnel area (3.2) is formed on the side facing away from the filter insert (5). A sealing ring (2) is located between the sealing bushing (3) and a retaining ring (1). The sealing ring exhibits at least one angled conical surface (2.1) and one face area (2.2) that is oriented at a right angle to the direction of fluid flow. At the seal bushing (3), an effective pressure area (3.1, 3.1?, 3.1?) that extends into the flow channel (8) is formed within the inner width of the sealing ring (2).
    Type: Application
    Filed: July 28, 2010
    Publication date: July 28, 2011
    Applicant: KREYENBORG BETEILIGUNGEN UND VERWALTUNGEN GmbH & CO. KG
    Inventors: STEFAN WOESTMANN, Jan-Udo Kreyenborg
  • Publication number: 20080283460
    Abstract: The invention relates to an arrangement and a device for filtering a fluid, particularly for plastic processing plants, wherein the pressure drop, or the flow rate reduction, created by the withdrawal of material from the process is sensitively balanced in that pressure constancy and flow rate constancy are achieved at the discharge duct (3).
    Type: Application
    Filed: July 6, 2007
    Publication date: November 20, 2008
    Applicant: KREYENBORG VERWALTUNGEN UND BETELIGUNGEN GMBH & CO., KG
    Inventor: Stefan Woestmann
  • Publication number: 20080197061
    Abstract: A device for filtering a liquid synthetic material. The device has a housing, a feed channel, a discharge channel, and backflow channels. The feed duct is subdivided into split-feed channels (2A, 2B). The cross-section of the orifice of the split-feed channels, where they open into the filter chambers, is smaller than the normal cross-section of the feed channels.
    Type: Application
    Filed: January 10, 2007
    Publication date: August 21, 2008
    Applicant: KREYENBORG VERWALTUNGEN UND BETEILIGUNGEN GMBH & CO., KG
    Inventor: Stefan Woestmann