Patents Assigned to Hydac Filtertechnik GmbH
  • 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: 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: 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: 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
  • Patent number: 10201769
    Abstract: A filter device has a filter element (3) in a filter housing (1). Corresponding threads (23, 33) form a screw connection between a housing cover (5) of the filter housing (1) and the filter element (3). A seal (29, 35) is between the filter element (3) and the housing cover (5). The screw connection is formed by threads (33) on a connecting pipe piece (31) that is part of an end cap (17) of the filter element (3) and that extends into the inner filter cavity (22) and by the threads (23) of the housing cover (5). The housing cover threads (23) are on a receiving pipe piece (21) formed by a separate component attached to the housing cover (5).
    Type: Grant
    Filed: November 28, 2012
    Date of Patent: February 12, 2019
    Assignee: HYDAC FILTERTECHNIK GMBH
    Inventors: Norbert Sann, Dirk Röder
  • Patent number: 10188969
    Abstract: A filter device has a filter housing (1) with a filter head (3), a filter pot (7) and a removable housing cover part (51) and has a filter element (13) separating a non-filtrate side (15) from a filtrate side (17) in the housing. A bypass valve device has a valve closure element (65) preloaded by a closing spring (69) into a closed position in which it bears against a valve seat part (74). If the filter element (13) is blocked, the closure element opens up a fluid path from the non-filtrate side (15) to the filtrate side (17), by passing the filter element (13). The valve closure element (65) and the closing spring (69) are on the cover part (51). The valve seat part (74) is on an element cap (43) of the filter element (13). The element cap has a receiving part (45) forming an enclosure for that end of the filter material (27) of the filter element (13) facing toward the cover part (51).
    Type: Grant
    Filed: January 12, 2016
    Date of Patent: January 29, 2019
    Assignee: HYDAC FILTERTECHNIK GMBH
    Inventors: Michael Sakraschinsky, Volkmar Klein
  • Patent number: 10173154
    Abstract: A filter device for fluids has a connection member (1) with a fluid input (19) for unfiltrate and fluid output (13) for filtrate, a first (43) and second filter elements (3) and a switching device (29) located in the connection member (1). By the switching device, a fluid connection between the fluid input (19) and fluid output (13) can be selectively established via the first filter element (43) or the second filter element (3). One of the filter elements is integrated into the interior of the connection member (1) as an auxiliary filter (43).
    Type: Grant
    Filed: May 15, 2013
    Date of Patent: January 8, 2019
    Assignee: HYDAC FILTERTECHNIK GMBH
    Inventor: Martin Freidinger
  • Patent number: 10166496
    Abstract: A filter device, in particular for fluids polluted with admixtures of water, such as diesel oil, includes a filter housing (1) having a fluid inlet (43), a fluid outlet (44) and a filter element (9). During the filtering process, the fluid can flow through the filter medium (11) of the filter element from the unfiltered side (14) to the filtered side (13) of the filter medium and into its inner filter cavity (17). On at least one side of the filter medium (11), a water-separating system (23) has a separating region (25) for separated water. The water separating system is connected via at least one water opening (35) that is open toward the separating region (25) to a water collecting chamber (45). The filter element (9) has a passage (29) forming a fluid connection to the inner filter cavity (17) and can be connected to an element receptacle (47) of the filter housing (1). A fluid-conveying system (41) forms fluid paths separated from each other.
    Type: Grant
    Filed: September 10, 2015
    Date of Patent: January 1, 2019
    Assignee: HYDAC FILTERTECHNIK GMBH
    Inventors: Richard Eberle, Micha Kreibig, Markus Dewes
  • Patent number: 10150064
    Abstract: A filter apparatus includes a filter housing having a filter head (3) and a filter bowl (7). The housing accommodates a filter element that separates a non-filtrate side (15) from a filtrate side (17). A differential pressure measurement device (59) indicates at least a blockage of the filter element during filtration operation and has a measurement piston (91) that is guided in a measurement housing (88) in a longitudinally displaceable manner. An end face (90) of that piston is subjected to the instantaneous pressure of the non-filtrate side (15). The opposite end face of the piston is subjected to the instantaneous pressure of the filtrate side (17). Each instantaneous pressure passes into the measurement housing (88) via at least one conduit (57, 61, 65, 89). At least a section (57, 61) of the conduit is arranged in an element cap (43) of the filter element.
    Type: Grant
    Filed: January 12, 2016
    Date of Patent: December 11, 2018
    Assignee: HYDAC FILTERTECHNIK GMBH
    Inventors: Volkmar Klein, Michael Sakraschinsky
  • Patent number: 10143945
    Abstract: A filter device includes a filter element (3), through which a fluid to be purified can flow at a determinable fluid operating pressure, and which can be accommodated in a housing (1). The fluid pressure prevailing at the respective filter element (3) may exhibit pressure increases or pressure peaks, which are damaging to the filter element (3), and in particular to its filter material (9), and which can be reduced and/or smoothened by a compensation device acting directly on the filter element (3) and having a flexible compensation element (29) that enables the volume of the fluid chamber of the housing (1) to be increased in accordance with a pressure peak or pressure increase. The flexible compensation element (29) is arranged between the outer side of the filter material (9) of the filter element (3) and the adjacent inner wall of the housing (1).
    Type: Grant
    Filed: October 11, 2013
    Date of Patent: December 4, 2018
    Assignee: HYDAC FILTERTECHNIK GMBH
    Inventors: Michael Sakraschinsky, Sebastian Fiedler
  • Patent number: 10119558
    Abstract: A control device, in particular for hydraulically controlling components of mobile working machines, has a pressure supply connection (P) and a tank or return connection (T) in addition to two user connections (A, B). Control and/or regulating valves (10, 14, 16, 18) are connected between the individual connections (P, T, A, B). Two control lines (C, Z) can control at least one of the control and/or regulating valves. A modular-type functional block (24, 26) is connected to at least one of the control lines (C, Z).
    Type: Grant
    Filed: September 24, 2014
    Date of Patent: November 6, 2018
    Assignee: HYDAC FILTERTECHNIK GMBH
    Inventors: Sascha Alexander Biwersi, Marcus Hettiger, Marcus Simon Specks, Christoph Stoenner, Marcus Karl Pfeiffer, Erik Lautner
  • Patent number: 10080982
    Abstract: An assembly forms a seal between components (11, 33) having sealing zones (37,51). The sealing zones face each other in a functional position of the components. A sealing element (43, 57) is on the sealing zone (37, 51) of one component (11, 33). A sealing surface (51) is on the sealing zone (37, 51) of the other component (11, 33) to form a radial seal. The components (11, 33) can be brought into the functional position by a relative movement in the axial direction. The sealing element (43, 57) sealingly interacts with the sealing surface (51) in the functional position. A third component (61) associated with an actuating part (62) acts on the sealing element (43;57) in the functional position of the components (11, 33) to deform the element to increase the sealing force.
    Type: Grant
    Filed: March 26, 2013
    Date of Patent: September 25, 2018
    Assignee: HYDAC FILTERTECHNIK GMBH
    Inventors: Michael Sakraschinsky, Volkmar Klein, Armin Schmidt
  • Patent number: 10071327
    Abstract: A filter medium for cleaning fluids includes a filter layer (9) formed from a filter material in a pleated web with a longitudinal direction (X) and a transverse direction (Y). A plastic grid (10) forms a support layer, bears against the filter layer (9) and has linear elements (12, 14) delimiting through openings (16) between them. Two groups of linear elements (12, 14) extend approximately at right angles to one another and delimit rectangular through openings (16). The linear elements (14) having a smaller diameter (d2) are in direct contact with the filter layer (9). The linear elements (12) having a larger diameter (d1) and having a greater spacing from one another relative to the filter layer (9) rest on the smaller diameter linear elements (14).
    Type: Grant
    Filed: December 23, 2013
    Date of Patent: September 11, 2018
    Assignee: HYDAC FILTERTECHNIK GMBH
    Inventors: Edwin Koch, Matthias Schwender