Patents by Inventor Per Larsson
Per Larsson 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).
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Patent number: 6872046Abstract: Enclosure for liquid lubricated rotating elements (12, 16, 17). A first rotating element (16) with at least one bearing (13, 14, 15) lubrication fluid drainage point that cooperates with a second rotating element (17). A partition wall (21) is mounted between the drainage point and the second element (16, 17), in such a manner that lubrication fluid is substantially prevented from migrating from the drainage point to the second element.Type: GrantFiled: May 27, 2003Date of Patent: March 29, 2005Assignee: Volvo Lastvagnar ABInventors: Per Larsson, Kent Giselmo
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Patent number: 6843305Abstract: A method of controlling the flow of molten metal in non-solidified portions of a strand (3) during continuous casting, and a device for application of the method. The device comprises a two-phase or plural-phase stirrer (1) arranged around a mould (6) that is open in opposite ends and that surrounds the strand (3), said stirrer (1) being arranged to generate a moving magnetic field in the melt, and at least one magnetic flow-conducting body (15) being placed between an inner periphery of said stirrer (1) and the outer periphery of the mould (6).Type: GrantFiled: April 7, 2001Date of Patent: January 18, 2005Assignee: ABB Group Services Center, ABInventors: Anders Lehman, Per Larsson
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Patent number: 6838910Abstract: A dual-rail static logic gate with a self cut-off mechanism is disclosed. In an embodiment, the output of the first rail is coupled to the input of the pull-up device of the second rail and vice versa. The cross-coupling allows the self cut-off mechanism of the static gate to function properly and provides for components which have lower capacitance than conventional static gates. The lower capacitance results in a faster static gate.Type: GrantFiled: August 1, 2003Date of Patent: January 4, 2005Assignee: Intel CorporationInventors: Atila Alvandpour, Per Larsson-Edefors, Ram K. Krishnamurthy, Krishnamurthy Soumyanath
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Publication number: 20040112054Abstract: Apparatus and method for supplying sealing air to an exhaust turbine (15) that interacts with an internal combustion engine for turbo-compound operation in a vehicle. Exhaust gases from the internal combustion engine are received in an exhaust system having a supercharger turbine (11) and which drives a compressor (13) for the engine combustion air. Residual energy in the exhaust gas flow is recovered via the exhaust turbine (15) for transfer to the crankshaft of the internal combustion engine. The exhaust turbine (15) is supported in a bearing housing (32), which is fed with sealing air via a fluid line (36). The exhaust system includes an exhaust brake throttle (16) having an exhaust gas pressure regulator (22) for regulating the exhaust brake pressure. The exhaust gas pressure regulator (22) is connected via a compressed air line (28) to a compressed air source (29, 30), which can be connected in parallel to the bearing housing (32) via a prioritizing valve (35) and a compressed air line (36).Type: ApplicationFiled: December 20, 2003Publication date: June 17, 2004Applicant: VOLVO LASTVAGNAR ABInventors: Per LARSSON, Nils-Olof HAKANSSON
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Publication number: 20040100741Abstract: The present invention relates to a method for testing, controlling and regulating a switching device with contact parts, to a switching device and to a computer program therefore. The switching device comprises an electric motor (6) and a mechanical coupling device (41) for transforming motion from the electric motor to one of the contact parts (4, 5). Position, speed and/or acceleration of the contact part during operation are controlled during operation. By means of a control unit (43), the operation of the switching device is adaptively controlled in real-time. Storage means (70) are provided and contain information on measurements, events and failures in the switching device and include operation parameters. In the logs, information regarding self-diagnostic tests of the switching device can be stored as well.Type: ApplicationFiled: July 7, 2003Publication date: May 27, 2004Inventors: Sjoerd G Bosga, Philip C Kiaer, Magnus Backman, Mars Svensson, Per-Olof Thureson, Lars Jonsson, Freddy Magnussen, Per Larsson, Stefan Valdemarsson
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Publication number: 20040099639Abstract: The invention concerns a switching device system including at least one switching device, signal means and control means. Each switching device includes at least one mobile contact part, an electric motor and, coupling means. The coupling means is arranged to transfer motion from the electric motor to the mobile contact part. The control means is arranged to control the switching device. According to the invention the control means is at least partly remotely located from the switching device. The signal means transmit signals from the switching device to the remotely located control means and vice/versa. The signals represent real-time data and/or off-line data The invention concerns also a switching device, control means and methods related to the invented system as well as computer program products for such system and electric power system being provided with such system.Type: ApplicationFiled: July 2, 2003Publication date: May 27, 2004Inventors: Stefan Valdermarsson, Per Larsson, Philip C Kjaer, Per-Olof Thureson, Sjoerd G Bogsa
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Publication number: 20040090720Abstract: An apparatus for a controlling an electric switching device (1) for alternating current arranged in a current path for opening the switching device and for breaking the current in the current path after occurrence of a fault current comprises members (15) adapted to detect the current in the current path and a unit (20) adapted to control the electric switching device to break the current in the current path directly after a half wave of the alternating current having a peak value below a predetermined current limit value, so that the breaking is completed through a zero-crossing of the alternating current terminating a said half wave.Type: ApplicationFiled: April 7, 2003Publication date: May 13, 2004Inventors: Per Larsson, Magnus Backman, Lars Jonsson
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Publication number: 20040090719Abstract: An apparatus (14) for detecting a zero crossing of an alternating current after occurrence of a fault in a current path (2) for determining a suitable time for opening an electric switching device (2) arranged in the current path for breaking the current in the current path comprises members (15) adapted to detect the current in the current path. An arrangement (19) is adapted to calculate the dc-level of the current and the decay of the dc-level with time on the basis of values of the alternating current detected and also predict the time for a future zero-crossing of the alternating current on the basis of at least current values obtained through said current detection, the dc-level calculated, the dc-decay calculated and information about the period time of the alternating current.Type: ApplicationFiled: June 4, 2003Publication date: May 13, 2004Inventors: Per Larsson, Magnus Backman, Lars Jonsson
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Publication number: 20040076507Abstract: A bale stacker for stacking papermaking pulp bales, comprising two sets of lifting forks (17-19; 20-22), which are directed to each other for together lifting bales, and a conveying means (12, 13) for inserting a new bale (14) beneath the lifted bales. The lifting forks are horizontally movable between advanced active lifting position and inactive retracted position and have forward portions (23) with continuously decreasing thickness. The drive means for the lifting forks comprise a motor (37) and a freewheel clutch for lifting and lowering the lifting forks, so that the lowering movement for both sets of lifting forks automatically and individually are adapted to their pulling-out movement when they rest on the underlying bale, although the speed of the drive motors (37) of the drive means which operate synchronized need not be controlled.Type: ApplicationFiled: August 21, 2003Publication date: April 22, 2004Inventors: Goran Forhaug, Mats Norberg, Per Larsson
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Patent number: 6717441Abstract: A dual-rail static logic gate with a self cut-off mechanism is disclosed. In an embodiment, the output of the first rail is coupled to the input of the pull-up device of the second rail and vice versa. The cross-coupling allows the self cut-off mechanism of the static gate to function properly and provides for components which have lower capacitance than conventional static gates. The lower capacitance results in a faster static gate.Type: GrantFiled: October 22, 2001Date of Patent: April 6, 2004Assignee: Intel CorporationInventors: Atila Alvandpour, Per Larsson-Edefors, Ram K. Krishnamurthy, Krishnamurthy Soumyanath
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Publication number: 20040021486Abstract: A dual-rail static logic gate with a self cut-off mechanism is disclosed. In an embodiment, the output of the first rail is coupled to the input of the pull-up device of the second rail and vice versa. The cross-coupling allows the self cut-off mechanism of the static gate to function properly and provides for components which have lower capacitance than conventional static gates. The lower capacitance results in a faster static gate.Type: ApplicationFiled: August 1, 2003Publication date: February 5, 2004Inventors: Atila Alvandpour, Per Larsson-Edefors, Ram K. Krishnamurthy, Krishnamurthy Soumyanath
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Publication number: 20040005231Abstract: Enclosure for liquid lubricated rotating elements (12, 16, 17). A first rotating element (16) with at least one bearing (13, 14, 15) lubrication fluid drainage point that cooperates with a second rotating element (17). A partition wall (21) is mounted between the drainage point and the second element (16, 17), in such a manner that lubrication fluid is substantially prevented from migrating from the drainage point to the second element.Type: ApplicationFiled: May 27, 2003Publication date: January 8, 2004Applicant: Volvo Lastvagnar ABInventors: Per Larsson, Kent Giselmo
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Publication number: 20030183363Abstract: A method of controlling the flow of molten metal in non-solidified portions of a strand (3) during continuous casting, and a device for application of the method. The device comprises a two-phase or plural-phase stirrer (1) arranged around a mould (6) that is open in opposite ends and that surrounds the strand (3), said stirrer (1) being arranged to generate a moving magnetic field in the melt, and at least one magnetic flow-conducting body (15) being placed between an inner periphery of said stirrer (1) and the outer periphery of the mould (6).Type: ApplicationFiled: February 12, 2003Publication date: October 2, 2003Inventors: Anders Lehman, Per Larsson
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Publication number: 20030076132Abstract: A dual-rail static logic gate with a self cut-off mechanism is disclosed. In an embodiment, the output of the first rail is coupled to the input of the pull-up device of the second rail and vice versa. The cross-coupling allows the self cut-off mechanism of the static gate to function properly and provides for components which have lower capacitance than conventional static gates. The lower capacitance results in a faster static gate.Type: ApplicationFiled: October 22, 2001Publication date: April 24, 2003Inventors: Atila Alvandpour, Per Larsson-Edefors, Ram K. Krishnamurthy, Krishnamurthy Soumyanath
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Patent number: 6518865Abstract: An electric switching device for fast closing of a high current in a power network comprising a first electrode (1), a second electrode (2), a movable contact element (3) closing said first and second electrodes, and an operating device. The operating device comprises a helically wound first coil (6) secured to the first electrode. The movable contact element comprises a flange (4) making contact with the coil. A current pulse flowing through the coil forms a repulsive force between the coil and the flange, said repulsive force throwing the movable contact element to the second electrode and completing the closing operation.Type: GrantFiled: February 26, 2002Date of Patent: February 11, 2003Assignee: ABB T&D Technology LTD et al.Inventors: Falah Al-Hosini, Stefan Valdemarsson, Lars Jonsson, Jan-Anders Nygren, Per Larsson
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Patent number: 6310872Abstract: The present invention relates to a device and a method for packet switching in a cellular radio communication system. Radio stations that have packets to transmit, transmit packets with a particular transmission probability (Si,n). The fraction of the transmitted packets that are received correctly by the receiving radio station, the so-called throughput fraction (ti,n), can be calculated. The transmission probability (Si,n) for a transmitting radio station is continuously updated according to a mapping function (f(a)) that depends on the value of the throughput fraction (ti,n). According to the invention a mapping function (f(a)), with a derivative with an absolute value less than one, is chosen (201). Starting values of the throughput fraction (ti,n) are generated (203) and these values are input to the mapping function. Updated values of the transmission probability (Si,n) are generated (204) by mapping function.Type: GrantFiled: June 23, 1998Date of Patent: October 30, 2001Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Magnus Almgren, Per Larsson
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Patent number: 6224330Abstract: In a fluid coupling including a casing enclosing an impeller and a turbine wheel which is rotatably mounted in the casing, the turbine wheel is formed on its face turned toward the casing with scrapers designed to scrape off impurities that have settled on the inner wall of the casing.Type: GrantFiled: December 28, 1998Date of Patent: May 1, 2001Assignee: Ab VolvoInventors: Per Larsson, Mikael Swanteson
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Patent number: 5972228Abstract: A filtering apparatus comprises: a pressure vessel; a plurality of filter elements arranged within the pressure vessel, the filter elements each having an upper end, a lower end and a side wall; filling bodies positioned within the filter elements; a first conduit for introducing compressed gas into the pressure vessel; a second conduit for transporting unfiltered liquid to and from the pressure vessel; and a third conduit for removing filtrate from the pressure vessel and transporting back-flushing liquid to and from the filter elements, the third conduit positioned proximate to a bottom portion of the pressure vessel and attached to the lower ends of the filter elements, such that the third conduit provides a support structure for the filter elements and the back-flushing liquid introduced via the third conduit fills the filter elements in a direction from the lower ends toward the upper ends, the volume of back-flushing liquid introduced into the filter elements limited by the filling bodies.Type: GrantFiled: May 15, 1997Date of Patent: October 26, 1999Assignee: Kvaerner Pulping Technologies ABInventors: Magnus Ingelman, Hans-.ANG.ke Karlsson, Per Larsson, Martin Wimby, Anita Markusson
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Patent number: 5151176Abstract: A filter for continuous filtration of a liquid includes conventionally a vessel having a center shaft on which is arranged at least one rotating filter element defining an inner space for liquid obtained at filtration. Further there is provided a washing device for washing of material deposited on the filter element, a connection between said inner space and outlet means from said vessel and a separator connected to said outlet and adapted for separating filtrate and gas. Means is provided outside said vessel for generating an overpressure in the gas space of the vessel and a lower pressure in the interior of the filter element at least corresponding to the evaporating temperature of the filtrated liquid for evaporation of the liquid in the separator. The separator is provided with a cooling device for cooling the separated gas and an outlet for condensate obtained at cooling.Type: GrantFiled: April 15, 1991Date of Patent: September 29, 1992Inventors: Kent Strid, Hans A. Karlsson, Per Larsson
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Patent number: D497660Type: GrantFiled: August 27, 2003Date of Patent: October 26, 2004Assignee: Hydrotech Nils-Ake Persson AktiebolagInventors: Åke Danielsson, Åke Ralvert, Emil Svensson, Per Larsson