Patents Assigned to Hydac Filtertechnik GmbH
  • Patent number: 12263424
    Abstract: A filter device for the filtration of fluids has a filter housing (10), which can be closed by a cover (40), and has a filter element (30) accommodated in a replaceable manner in the filter housing. At least one functional element is present on the cover (40) and on the filter housing (10) and on the filter element (30) in such a way that the filtration of the fluid is only possible when all functional elements interact simultaneously.
    Type: Grant
    Filed: January 13, 2021
    Date of Patent: April 1, 2025
    Assignee: HYDAC FILTERTECHNIK GMBH
    Inventors: Volkmar Klein, Michael Sakraschinsky, Stefan Hennes
  • Patent number: 12257540
    Abstract: A filter element has a filter mat web (10) with free, mutually adjacent web ends (12) joined along a joint (16) forming a hollow body. The joint (16) is made of at least one connecting part (18), which is provided with groove-shaped receiving channels (20, 22. Each of the receiving channels is used to receive one web end (12) of the filter mat (10).
    Type: Grant
    Filed: July 27, 2021
    Date of Patent: March 25, 2025
    Assignee: HYDAC FILTERTECHNIK GMBH
    Inventor: Harald Mees
  • Patent number: 12201926
    Abstract: A filter device has a filter housing (14), in which a replaceable filter element (18) is accommodated, and has a filter head (26) for securing the filter housing (14) to a third component, such as a tank wall (10) of a storage tank. The filter housing (14) is mounted on the filter head (26) in an articulated manner by a bearing (28) providing more than one degree of freedom.
    Type: Grant
    Filed: September 1, 2020
    Date of Patent: January 21, 2025
    Assignee: HYDAC FILTERTECHNIK GMBH
    Inventors: Gerhard Stehle, Michael Sakraschinsky, Florentin Van Uffelen
  • Patent number: 12109514
    Abstract: A filter device has a filter housing (2) and a filter element (15) accommodated in the filter housing. The element material (44) of the filter element for filtering a liquid extends between two end caps (40, 42). At least one end cap (40) is mounted on an element receptacle (14). A bearing (46, 54), providing more than one degree of freedom, is used to articulate the filter element (15) on the element receptacle (14) via its one end cap (40). The bearing has a convex bearing surface (46) that is guided in a concave bearing surface (54). The respective bearing surface (46, 54) is part of a respective shell (55a, 55b). At least one shell (55b) has a passage (55c) for liquid media.
    Type: Grant
    Filed: November 12, 2019
    Date of Patent: October 8, 2024
    Assignee: HYDAC FILTERTECHNIK GMBH
    Inventors: Volkmar Klein, Stefan Hennes
  • Publication number: 20240226781
    Abstract: The invention relates to a filter device at least consisting of two coaxially arranged filter elements (12, 14) which delimit a cavity (16) between them, characterised in that the inner side (18) of the outer filter element (14), which faces the cavity (16), has at least in some parts a separating arrangement (20) for gas bubbles such as air bubbles, and the cavity (16) opens at the head end into at least one discharge opening (22) for gas bubbles coming in.
    Type: Application
    Filed: January 20, 2022
    Publication date: July 11, 2024
    Applicant: HYDAC Filtertechnik GmbH
    Inventors: Alexander Nenno, Andre Michael Schneider, Klaus Morgens, Marco Tassone
  • Publication number: 20240149191
    Abstract: The invention relates to a method for forming a filter medium, which is suitable for filtering fluids, for a filter element, said method having at least the following steps: —applying at least one self-contained sealant (16, 28) onto a fluid-permeable media web (14) in a specifiable direction (26), —producing a solid composite at least between parts of the sealant (16, 28) and the media web (14), —pleating the composite, thereby forming individual filter folds, —producing a hollow body such that in order to —obtain at least one seal region on the media web (14), the respective sealant (16, 28) is arranged on the inner face of the hollow body, a seal is produced for each filter fold, and an end-face seal of the media web (14) is produced. An application medium is applied as the sealant (16, 28) onto the media web (14) in a strip-shaped manner along at least one longitudinal edge (51) of the media web (14), said sealant forming the respective seal region when cured.
    Type: Application
    Filed: February 25, 2022
    Publication date: May 9, 2024
    Applicant: HYDAC Filtertechnik GmbH
    Inventors: Michael Sakraschinsky, Harald Mees
  • Publication number: 20240139654
    Abstract: The disclosure relates to a method for forming a filter medium, which is suitable for filtering fluids, for a filter element, said method comprising: applying at least one self-contained sealant onto a fluid-permeable media web in a specifiable direction, producing a solid composite at least between parts of the sealant and the media web, pleating the composite, thereby forming individual filter folds, producing a hollow body in that the two lateral edges of the media web which lie opposite each other so as to adjoin each other and which run transversely to the specified direction are connected together such that in order to obtain at least one seal region on the media web, the respective sealant is arranged on the inner face of the hollow body, a seal is produced for each filter fold, and an end-face seal of the media web is produced.
    Type: Application
    Filed: February 25, 2022
    Publication date: May 2, 2024
    Applicant: HYDAC Filtertechnik GmbH
    Inventors: Michael Sakraschinsky, Harald Mees
  • Patent number: 11376949
    Abstract: A closure device for a fluid container, in particular a hydraulic tank, has a base (4), which can be attached to the container opening and has a cover part (2), which encloses a ventilation and/or a filter device (36). The cover part (2) is held on the base (4) so as to be freely rotatable in a functional unlocking position. In a functional locking position, the closure device permits the container opening to be unlocked by a safety device (48, 50, 58) while connecting the cover part (2) to the base (4). The safety device (48, 50, 58) can be actuated by a magnetic device generating a magnetic field (62). The magnetic device establishes the functional locking position of the cover (2) and the base (4) by magnetic force.
    Type: Grant
    Filed: November 16, 2018
    Date of Patent: July 5, 2022
    Assignee: HYDAC FILTERTECHNIK GMBH
    Inventor: Michael Kerber
  • Patent number: 11305216
    Abstract: A filter device for transmission oil has a filter element (24) insertable into a transmission oil pan (70) with a filter medium (32) separating an unfiltered side from a filtrate chamber connected to an outlet (38, 50, 72), to which a suction oil pump can be connected. The filter medium (32) has a first structural layer (46) having a predetermined surface area and predeterminable filter properties and has a second structural layer (44, 60) having predeterminable filter properties. The surface area of the second structural layer (44; 60) is different from the surface area of the first structural layer (46). The structural layers (44, 46, 60) encompass an inner filter cavity (30) and are pleated having the same type of pleats. The pleated structural layers (44, 46, 60) extend in axial alignment between two end caps (22, 34) of the filter element (24).
    Type: Grant
    Filed: September 6, 2018
    Date of Patent: April 19, 2022
    Assignee: HYDAC FILTERTECHNIK GMBH
    Inventors: Matthias Schwender, Edwin Koch, Daniel Kleemann, Ute Lehmann, Alexander Nenno, Andre Michael Schneider
  • Patent number: 11033838
    Abstract: A filter element (1), with a preferably multilayer structure of a filter medium (3), in pleated form has filter pleats (5, 7) of different pleat heights (h1, h2). The filter pleats (7) with a first pleat height (h1) oppose the filter pleats (5) lower second pleat height (h2). The filter element has a throughflow direction for fluid to be cleaned away from a dirty side to a clean side (R). The transitions arranged adjacent to the inner side all conclude along a fictitious circular cylinder (9), which penetrates the filter medium (3) coaxially to its longitudinal axis (LA).
    Type: Grant
    Filed: December 24, 2012
    Date of Patent: June 15, 2021
    Assignee: HYDAC FILTERTECHNIK GMBH
    Inventor: Timo Lang
  • Patent number: 10926202
    Abstract: A filter device has a filter element (1) received in a filter housing of at least two interconnectable housing parts (17, 19). The filter element (1) can be fixed to a housing part (19) in a removable manner by one screw connection (32, 33). An additional screw connection (17, 41) is provided for connecting the housing parts (17, 19). To transmit a torque between threaded elements (33) of the one screw connection (32, 33) and of the additional screw connection (41), the threaded elements are rotatable relative to each other. A coupling device (43, 46, 61) is added that allows an additional rotational movement of the threaded element (17) of the additional screw connection (41) when the threaded element (33) of the one screw connection (32, 33) reaches the fixed rotational state.
    Type: Grant
    Filed: August 13, 2016
    Date of Patent: February 23, 2021
    Assignee: HYDAC FILTERTECHNIK GMBH
    Inventors: Patrick Maurer, Stefan Hennes, Michael Sakraschinsky
  • Patent number: 10639565
    Abstract: A method for producing a filter element for filtering fluids, such as hydraulic fluids, lubricants or fuels, includes the following steps: a) providing at least one section of a filter mat web (14) made of one or more layers of at least one filter medium; b) connecting the ends of the at least one section to form an annular body (12) and placing that annular body onto a support pipe (16); c) wrapping at least one cutout of a film web (8) around the outside of the annular body (12) located on the support pipe (16) and d) placing end areas (24) of the at least one cutout of the film web (8) one on top of the other and connecting the overlapping end areas (24).
    Type: Grant
    Filed: January 25, 2011
    Date of Patent: May 5, 2020
    Assignee: HYDAC FILTERTECHNIK GMBH
    Inventor: Harald Mees
  • Patent number: 10617976
    Abstract: A filter apparatus has a filter housing (1) accommodating at least one filter element (17) having an inner filter cavity (23) enclosed by a filter medium (27). The housing (1) contains an element bolder (19) that interacts with the filter element (17) located in its functional position. The element holder (19) has a projecting accommodating part (43) with an outer configuration adapted to the shape of an opening (37) located at the end of the filter element (17) to be secured to the element holder (19). The accommodating part (43) fits through the opening (37) of the filter element (17) located in the functional position.
    Type: Grant
    Filed: December 21, 2017
    Date of Patent: April 14, 2020
    Assignee: HYDAC FILTERTECHNIK GMBH
    Inventors: Norbert Sann, Martin Braune
  • Patent number: 10610811
    Abstract: A filter device for filtering fluid particularly an aqueous urea solution, includes a filter housing (1), a filter element (11) and a compensating element (31) for compensating fluctuations in the pressure and/or volume of the fluid. At least one elastically-flexible membrane (31) serves as the compensating element. The membrane wall of of the membrane is held in a retaining part (35) and maintains a separation between the fluid and a compressible filling medium such as a working gas.
    Type: Grant
    Filed: June 14, 2016
    Date of Patent: April 7, 2020
    Assignee: HYDAC FILTERTECHNIK GMBH
    Inventor: Sebastian Fiedler
  • Patent number: 10478760
    Abstract: A filter element for fluid filtration, in particular for hydraulic fluid, has element components, such as pleated and multi-layer filter material (10) that extends between two end caps (26) and has a fluid-permeable supporting tube (14) forming a hollow cylinder. At least one element component of the filter element is provided at least partially with at least one luminescent material or marker such that the material or marker is excited to a characteristic, detectable wave emission when exposed to a certain exciter wave or wave spectrum.
    Type: Grant
    Filed: June 9, 2015
    Date of Patent: November 19, 2019
    Assignee: HYDAC FILTERTECHNIK GMBH
    Inventors: Volkmar Klein, Claudia Brocker
  • Patent number: 10335721
    Abstract: A filter element for a filter device has a filter housing (3; 4). The filter element (1) includes a receiving part (19) which, when the filter element (1) is located in the filter housing (3; 4) in the operational position, comes into fluid communication with a housing part (17; 18) of the filter housing (3; 4) to form a fluid connection (9). The receiving part (19) of the filter element (1) has an inner, first guiding path (37) for sealing contact to the housing part (17) of the filter housing (3) according to a first mode of construction and an outer, second guiding path (51) for sealing contact to the housing part (18) of the filter housing (4) according to a second mode of construction.
    Type: Grant
    Filed: March 7, 2012
    Date of Patent: July 2, 2019
    Assignee: HYDAC FILTERTECHNIK GMBH
    Inventors: Norbert Sann, Dirk Röder
  • Patent number: 10335723
    Abstract: A filter device has a filter element (17) that is exchangeably disposed in a filter housing (1). The filter element (17) is provided on one end with an end cap (23) that forms a surround for a rim of a filter material (31). The end cap (23) has a connector (43) attaching the filter element (17) in an operating position to an element seat (19; 45) inside the filter housing (1) such that a fluid-impermeable connection is formed between filter housing (1) and filter element (17). The connector (43) enables the positionally fixed mounting of the filter element (17) and the formation of a fluid-impermeable connection in conjunction with element seats (19; 45) of filter housings (1) of different designs.
    Type: Grant
    Filed: June 1, 2017
    Date of Patent: July 2, 2019
    Assignee: HYDAC FILTERTECHNIK GMBH
    Inventor: Dirk Roeder
  • Patent number: 10307699
    Abstract: A filtering element for filtering devices, comprising a filtering material (5) which defines a filtering space and is intended for the filtration of fluids, and at least one water indicator (13, 19, 23) which is provided at a location coming into contact with fluid during the filtration mode and indicates the presence of water in the fluid in a visually recognizable manner, is characterized in that the at least one water indicator (13, 19, 23) is provided on an end cap (7, 9) for mounting at one end of the filtering material (5), and/or is at least partially part of the end cap (7, 9), and/or is provided on a fluid-permeable supporting structure (21) surrounding the filtering material (5), and/or is at least partially part of the supporting structure (21).
    Type: Grant
    Filed: July 8, 2011
    Date of Patent: June 4, 2019
    Assignee: HYDAC FILTERTECHNIK GMBH
    Inventors: Edwin Koch, Matthias Schwender, Andreas Schmitz
  • Patent number: 10307700
    Abstract: A contamination indicator is for filter elements (12) for fluids that are replaceably housed in a filter housing (2). The indicator has a fluid-conveying connection (58) to the interior of the housing (2) and possesses an indicating device (52) providing information concerning the degree to which the filter element is contaminated (12). A temperature-dependently active actuation device (50) is connected upstream from the indicating device (52) in the direction of fluid inlet. By the actuation device, the indicating device (52) is activated when the fluid temperature has reached a predefinable threshold value.
    Type: Grant
    Filed: February 23, 2015
    Date of Patent: June 4, 2019
    Assignee: HYDAC FILTERTECHNIK GMBH
    Inventors: Artur Jung, Jörg Michael Wendels
  • Patent number: 10239002
    Abstract: A filter material (2) for fluids, in particular hydraulic fluids, includes a filter medium (4) having at least one layer, and a supporting structure (6) partially made of a plastic material and resting flatly in some surface areas on at least one side of the filter medium (4). The filter medium (4) and the supporting structure (6) are connected to one another by laminating, covering and/or by a melting process.
    Type: Grant
    Filed: June 22, 2011
    Date of Patent: March 26, 2019
    Assignee: HYDAC FILTERTECHNIK GMBH
    Inventors: Matthias Schwender, Andreas Schmitz, Edwin Koch