Patents by Inventor Stefan Hennes

Stefan Hennes 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: 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
  • Publication number: 20250066944
    Abstract: The invention relates to a dispersion electrolyte for the electrodeposition of graphite-containing tin, nickel or tin-nickel layers, to a method for the electrodeposition of such a graphite-containing layer, to a metal substrate coated with such a graphite-containing layer, and to the use of the dispersion electrolyte. The dispersion electrolyte comprises Sn2+ ions and/or Ni2+ ions, graphite particles, at least one anionic dispersant, a complexing agent for Sn2+ and Ni2+ ions, a conducting salt and water, and has a pH of 4 to 7.
    Type: Application
    Filed: December 30, 2021
    Publication date: February 27, 2025
    Inventors: Thomas Pliet, Stefan Henne, Michael Neiffer, Vera Lipp
  • 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
  • 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: 9808749
    Abstract: A device for the suction filtration of fluids, such as urea solutions for exhaust gas after-treatment systems, has a tank (2) storing the fluid, and a filter element (34) arranged in the tank and provided with a filter medium (32) separating the tank contents from a clean-side inner filter cavity (20). The filter cavity extends from the bottom (10) of the tank (2) to a filling level height (28) and corresponds to a part of the filling volume of the tank (2). On the filter cavity (20), a suction connection (22) discharges the cleaned fluid by a suction pressure corresponding to a system operating pressure. The filter element (34) is provided with a filter medium (32), which is air-impermeable if suction pressures are within the range of a low system operating pressure.
    Type: Grant
    Filed: July 25, 2013
    Date of Patent: November 7, 2017
    Assignee: HYDAC FILTERTECHNIK GMBH
    Inventors: Norbert Sann, Viktor Josef Lauer, Stefan Hennes, Michael Sakraschinsky, Alexander Wohlers, Paul Seibold
  • Patent number: 9126129
    Abstract: A filter device includes a filter element (9) received in a housing (1). The housing can be closed by a cover part (3) having fluid ducts (35, 41). A connecting unit is provided to create a fluid-conducting connection between the filter element (9) and an associated fluid duct (35) of the cover part (3). The connecting unit is in the form of a coupling having a movable coupling part (33) creating the fluid connection in the functional state.
    Type: Grant
    Filed: July 9, 2008
    Date of Patent: September 8, 2015
    Assignee: HYDA FILTERTECHNIK GMBH
    Inventors: Michael Sakraschinsky, Stefan Hennes
  • Publication number: 20150202553
    Abstract: The invention relates to a device for the suction filtration of fluids, such as urea solutions for exhaust gas after-treatment systems, comprising a tank (2) storing the fluid, and a filter element (34) arranged therein provided with a filter medium (32), which separates the tank contents from a clean-side inner filter cavity (20) and extends from the bottom area (10) of the tank (2) to a filling level height (28), which corresponds to a part of the filling volume of the tank (2). On the filter cavity (20), a suction connection (22) is provided, via which the cleaned fluid can he discharged by way of a suction pressure corresponding to a system operating pressure. The invention is characterized in that the filter element (34) is provided with a filler medium (32), which is air-impermeable if suction pressures are within the range of a low system operating pressure.
    Type: Application
    Filed: July 25, 2013
    Publication date: July 23, 2015
    Inventors: Norbert Sann, Viktor Josef Lauer, Stefan Hennes, Michael Sakraschinsky, Alexander Wohlers, Paul Seibold
  • Patent number: 8852431
    Abstract: The invention relates to a filter device having at least one filter element (11) comprising a filter medium (27) disposed between two receiving parts (31, 35) and a connecting device located at the lower receiving part (35) for a fluid connection to a fluid device, in particular to a fluid tank (1), having a connecting part (45) disposed on the connecting device, said connecting part being pretensioned by the action of a first energy store (43) for a motion away from the upper receiving part (31) into a closed position blocking the connecting device, having a further, second energy store (49) for generating a relative motion between the lower receiving part (35) and a closing-off part (17) of the device, and having a sealing device (55) sealing between the lower receiving part (35) and the closing-off part (17) as soon as said part and the lower receiving part (35) make contact with each other under the influence of the second energy store (49).
    Type: Grant
    Filed: November 3, 2009
    Date of Patent: October 7, 2014
    Assignee: Hydac Filtertechnik GmbH
    Inventors: Michael Sakraschinsky, Stefan Hennes
  • Publication number: 20120018358
    Abstract: A filter apparatus, provided for installation in a fluid storage tank, having at least one preferably replaceable filter element (11), through which a fluid can flow from the outside to an inner hollow filter chamber (19), forming the clean side, and which is surrounded by a housing wall (1) which forms a fluid chamber (15), into which the cleaned fluid from the inner hollow filter chamber (19) can flow, the housing wall having at least one wall opening (31) which forms a fluid passage located within the region of the variable fluid level in the storage tank. Said filter apparatus is characterized in that a control device (39, 41, 43) is provided which can be actuated as a function of the fluid level the storage tank and brings the fluid passage of the at least one wall opening (31) close to the position of the surface of the fluid in the storage tank.
    Type: Application
    Filed: March 10, 2010
    Publication date: January 26, 2012
    Inventors: Norbert Sann, Michael Sakraschinsky, Stefan Hennes
  • Publication number: 20120018364
    Abstract: The invention relates to a filter device having at least one filter element (11) comprising a filter medium (27) disposed between two receiving parts (31, 35) and a connecting device located at the lower receiving part (35) for a fluid connection to a fluid device, in particular to a fluid tank (1), having a connecting part (45) disposed on the connecting device, said connecting part being pretensioned by the action of a first energy store (43) for a motion away from the upper receiving part (31) into a closed position blocking the connecting device, having a further, second energy store (49) for generating a relative motion between the lower receiving part (35) and a closing-off part (17) of the device, and having a sealing device (55) sealing between the lower receiving part (35) and the closing-off part (17) as soon as said part and the lower receiving part (35) make contact with each other under the influence of the second energy store (49).
    Type: Application
    Filed: November 3, 2009
    Publication date: January 26, 2012
    Applicant: Hydac Filtertechnik GMBH
    Inventors: Michael Sakraschinsky, Stefan Hennes
  • Publication number: 20100282341
    Abstract: A filter device comprising a filter element (9), which can be received in a housing (1) that can be closed by means of a cover part (3) having fluid ducts (35, 41), a connecting unit being provided in order to create a fluid-conducting connection between the filter element (9) and an associated fluid duct (35) of the cover part (3), is characterized in that the connecting unit is configured in the form of a coupling having a movable coupling part (33), which in the functional state creates the fluid-conducting connection.
    Type: Application
    Filed: July 9, 2008
    Publication date: November 11, 2010
    Inventors: Michael Sakraschinsky, Stefan Hennes
  • Patent number: 7022228
    Abstract: A filter device includes a pot-shaped filter housing (1) that defines a longitudinal axis along which a filter element (13) can be inserted into and removed form the filter housing (1). A retaining device detachably retains the filter element (13) in the filter housing (1) and has first and second retaining elements on the inner side of the filter housing (1) and on the filter element (13) and interacting with one another. At least one set of the retaining elements has a shape coaxial to the longitudinal axis of the filter housing (1) and forms at least a part of a thread. When the filter element (13) is rotated about its longitudinal axis, it is locked in a form-fit.
    Type: Grant
    Filed: August 2, 2002
    Date of Patent: April 4, 2006
    Assignee: Hydac Filtertechnik GmbH
    Inventors: Stefan Hennes, Michael Sakraschinsky, Patrik Maurer, Norbert Sann
  • Patent number: 6932900
    Abstract: A filter device includes a filter housing (10) in which at least two filter elements (12, 14) with differing filter grades of filter material (16) are arranged. The filter elements are partially separated from each other by a separating device (18), with a through channel (24) of predetermined cross-section for a hydraulic connection between neighboring filter chambers (20, 22),. The filter chambers arranged prior to the filter materials (16) in the flow direction of the fluids for filtering. The filter device permits a combination of main- and side-stream filters in the smallest possible space, whereby very good purity levels for the filtered fluid are nevertheless achieved.
    Type: Grant
    Filed: January 3, 2001
    Date of Patent: August 23, 2005
    Assignee: Hydac Filtertechnik GmbH
    Inventors: Norbert Sann, Martin Reik, Stefan Hennes, Karl-Heinz Leichner
  • Publication number: 20040149640
    Abstract: The invention relates to a filter device comprising a pot-shaped filter housing (1) that defines a longitudinal axis along which a filter element (13) can be inserted into and removed from the filter housing (1). A retaining device detachably retains the filter element (13) in the filter housing (1) and comprises first and second retaining elements that are provided on the inner side of the filter housing (1) and on the filter element (13) and that interact with one another. At least one set of the retaining elements has a shape coaxial to the longitudinal axis of the filter housing (1) and forms at least a part of a thread in such a manner that, when the filter element (13) is rotated about its longitudinal axis, it is locked in a form-fit.
    Type: Application
    Filed: December 9, 2003
    Publication date: August 5, 2004
    Inventors: Stefan Hennes, Michael Sakraschinsky, Patrik Maurer, Norbert Sann
  • Patent number: 6695966
    Abstract: A filter element is provided with an ascending pipe and a filter material subject to soiling and is supported by a supporting pipe. The filter material is separable from the ascending pipe such that the multi-component ascending pipe can be reused and to reduce the weight of hazardous waste to be disposed of when the soiled filter material has been changed. The ascending pipe is provided at least on one of its ends with a reception for the filter material in such a manner that the filter material with the supporting pipe as one assembly (22) and with the ascending pipe (10) as another component are detachable coupled, allowing the exchange of the soiled filter material by new filter material while keeping the ascending pipe. The filter element can be assembled during production with less effort, thereby allowing for a reduction of costs.
    Type: Grant
    Filed: November 29, 2001
    Date of Patent: February 24, 2004
    Assignee: Hydac Filtertechnik GmbH
    Inventors: Michael Sakraschinsky, Stefan Hennes
  • Patent number: 6620316
    Abstract: A modular system for putting together different sized filter elements, especially filter elements having different lengths, more particularly filter devices for hydraulic fluids, comprising a support tube that defines an inner cavity in the corresponding filter element, said tube being surrounded by a filter mat that is substantially cylindrical and that matches the different dimensions and having passages to let the fluid pass through. The filter elements also contain at least one coupling member enabling connection on the end side of a corresponding support tube to an additional support tube having a location on the end side for interacting with and locking on the coupling member. Each coupling member is embodied as an attachment plug element with a crown consisting of interspaced tabs extending in axial direction and hooks for snapping on the location of the attached support tube.
    Type: Grant
    Filed: February 15, 2001
    Date of Patent: September 16, 2003
    Assignee: Hydac Filtertechnik GmbH
    Inventors: Michael Sakraschinsky, Stefan Hennes
  • Publication number: 20030106847
    Abstract: The invention relates to a filter device with a filter housing (10), in which at least two filter elements (12, 14), with differing filter grades of filter material (16), are arranged, which are each partially separated from each other by a separating device (18), with a through channel (24) of predetermined cross-section for a hydraulic connection between neighbouring filter chambers (20, 22), which are arranged prior to the filter materials (16) in the flow direction of the fluids for filtering. According to the invention, the filter device permits a combination of a so-called main- and a so-called side-stream filter in the smallest possible space, whereby very good purity levels for the filtered fluid are nevertheless achieved.
    Type: Application
    Filed: September 30, 2002
    Publication date: June 12, 2003
    Inventors: Norbert Sann, Martin Reik, Stefan Hennes, Karl-Heinz Leichner
  • Patent number: 5046409
    Abstract: An electric coffee or tea making machine wherein the housing resembles a carafe and has an annular outer chamber for hot beverage and a centrally located chamber for a body of water. The centrally located chamber is located above a heating unit, such as a standard electric resistance heater, a halogen lamp or a heater with one or more thick film conductors, and the heated liquid flows upwardly through a riser to be distributed over a supply of comminuted coffee beans or tea leaves in a removable filtering unit which has an outlet for admission of freshly brewed coffee or tea into the outer chamber. A cover above the filtering unit is threadedly connected to the upper end of the housing to ensure that the interior of the housing can be maintained well above atmospheric pressure without risking escape of hot water or steam. The device for uniformly distributing heated water in the filtering unit can constitute a nozzle or a foraminous top wall above the supply of flavoring agent.
    Type: Grant
    Filed: August 16, 1989
    Date of Patent: September 10, 1991
    Assignee: Robert Krups Stiftung & Co. KG.
    Inventor: Stefan Henn
  • Patent number: 4843955
    Abstract: A machine for brewing coffee or other hot beverages has a container for a supply of liquid, a heater, a hollow filter holder which can receive a relatively large quantity of comminuted coffee beans or another flavoring agent, and a riser which conveys heated liquid to the filter holder. The admitted liquid contacts the confined supply of flavoring agent and can be discharged by way of a sealable opening in the bottom wall of the filter holder. If the machine is to brew a single cupful or a similar relatively small quantity of a hot beverage, the holder receives an insert which can hold a small quantity of flavoring agent and is contacted by hot liquid before the liquid enters the interior of the holder where it can be stored or discharged into a cup or another relatively small vessel.
    Type: Grant
    Filed: April 22, 1988
    Date of Patent: July 4, 1989
    Assignee: Robert Krups Stiftung & Co. K.G.
    Inventors: Stefan Henn, Klaus Beumer
  • Patent number: 4843954
    Abstract: A tea making machine wherein the bottom wall of an upper vessel can be used to seal the open top of a lower vessel which contains a supply of water. The upper vessel contains a supply of tea leaves and its bottom wall has an upright tubular portion for a riser with an open upper end in the upper vessel and an open lower end in the lower vessel. The riser is adjustable so that its lower end can be moved to any one of a number of different levels above the bottom of the lower vessel. When the supply of water in the lower vessel is heated, the pressure in the lower vessel rises and boiling water is compelled to flow up the riser and into the upper vessel where it contacts the tea leaves. When the level of the supply of water in the lower vessel descends below the lower end of the riser, such water must be evaporated in order to rise into the upper vessel. The interval which elapses for evaporation determines the steeping time in the upper vessel.
    Type: Grant
    Filed: May 16, 1988
    Date of Patent: July 4, 1989
    Assignee: Robert Krups Stiftung & Co. KG
    Inventor: Stefan Henn