Patents by Inventor Leif A. Persson
Leif A. Persson 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: 11915888Abstract: A conductor arrangement for a circuit breaker interrupter, the conductor arrangement including: a tubular body conductor including a first metal material, and an at least partly tubular contact conductor including a second metal material; wherein a tubular end portion of the tubular body conductor is mechanically and electrically joined with a tubular end portion of the tubular contact conductor in an circumferential overlap region formed by longitudinally press-fitting one of the tubular body conductor and the tubular contact conductor into the other one of the tubular body conductor and the tubular contact conductor, wherein the outer one of the tubular end portions of the tubular body conductor and the at least partly tubular contact conductor at the overlap region includes copper and the inner one includes aluminum.Type: GrantFiled: June 29, 2021Date of Patent: February 27, 2024Assignee: HITACHI ENERGY LTDInventors: Tomas Roininen, Benny Wedin, Lars Jeppsson, Kent Kirjonen, Leif Persson
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Publication number: 20230197363Abstract: A conductor arrangement for a circuit breaker interrupter, the conductor arrangement including: a tubular body conductor including a first metal material, and an at least partly tubular contact conductor including a second metal material; wherein a tubular end portion of the tubular body conductor is mechanically and electrically joined with a tubular end portion of the tubular contact conductor in an circumferential overlap region formed by longitudinally press-fitting one of the tubular body conductor and the tubular contact conductor into the other one of the tubular body conductor and the tubular contact conductor, wherein the outer one of the tubular end portions of the tubular body conductor and the at least partly tubular contact conductor at the overlap region includes copper and the inner one includes aluminum.Type: ApplicationFiled: June 29, 2021Publication date: June 22, 2023Inventors: Tomas Roininen, Benny Wedin, Lars Jeppsson, Kent Kirjonen, Leif Persson
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Patent number: 10728459Abstract: A system for tracking movable objects in a scene comprising a first overview unit arranged to capture a first overview of a first portion of a scene, and a second overview unit arranged to capture a second overview of a second portion of a scene, wherein the first portion and the second portion may be partly overlapping. The system further comprises a PTZ-camera to image selected objects in the first or second portion of the scene. The first and the second overview unit are configured to detect and locate moving objects in the scene, and to transmit positional data of said moving objects to a control unit that determines if two or more movable objects may be imaged using a single view of the PTZ-camera, and to send instructions to the PTZ-camera to image said two or more movable objects concurrently.Type: GrantFiled: June 20, 2018Date of Patent: July 28, 2020Assignee: Axis ABInventors: Jacob Gumpert, Leif Persson, Robin Dahlström, Mattias Gylin
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Publication number: 20180376074Abstract: A system for tracking movable objects in a scene comprising a first overview unit arranged to capture a first overview of a first portion of a scene, and a second overview unit arranged to capture a second overview of a second portion of a scene, wherein the first portion and the second portion may be partly overlapping. The system further comprises a PTZ-camera to image selected objects in the first or second portion of the scene. The first and the second overview unit are configured to detect and locate moving objects in the scene, and to transmit positional data of said moving objects to a control unit that determines if two or more movable objects may be imaged using a single view of the PTZ-camera, and to send instructions to the PTZ-camera to image said two or more movable objects concurrently.Type: ApplicationFiled: June 20, 2018Publication date: December 27, 2018Applicant: Axis ABInventors: Jakob Gumpert, Leif Persson, Robin Dahlström, Mattias Gylin
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Patent number: 8516860Abstract: The present disclosure relates to a washing machine with a drying function, capable of performing a washing program and a drying program. The machine comprises a cabinet (1), a tub (9) in the cabinet and a door (3), through which access to the tub interior can be achieved, and further an air evacuation chamber (37) which comprises an upper section (59) and a lower section (57), wherein the upper section is connected to the tub in order to allow an air flow from the tub to the upper section, and the upper section is connected to the lower section at a connection point which is higher than the maximum water level during the washing program, such that air can flow to the lower section during the drying program while water is prevented from flowing from the tub to the lower section during the washing program. This allows the lower part to contain parts of the drying system that are to be kept dry, which allows a more compact machine to be built.Type: GrantFiled: June 2, 2008Date of Patent: August 27, 2013Assignee: Aktiebolaget ElectroluxInventors: Leif Persson, Anders Brun, Jorgen Martinsson, Jonny Persson, Johnny Olsson
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Publication number: 20110173941Abstract: The present invention concerns a power transmission for a rotary type of walk-behind lawn mower. The transmission comprises a first transmission part (7A) arranged to be mounted in a lawn mower housing (1) and comprising a transmission pulley (6) , which in turn is arranged to be connected to an engine pulley (4) of a lawn mower via a drive belt (5) . A second part (7B) of the transmission is arranged to be connected to a wheel axle (9) of the lawn mower, wherein the first transmission part (7A) is connected to the second transmission part (7B) via an articulated joint (11) such that the second transmission part (7B) and the wheel axle (9) are arranged to be pivotally mounted on said lawn mower housing (1) . Thereby pivoting will adjust the height of said lawn mower housing (1) in relation to a ground plane. The invention also concerns a walk-behind lawn mower comprising such a transmission.Type: ApplicationFiled: May 25, 2007Publication date: July 21, 2011Inventor: Leif Persson
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Publication number: 20100257902Abstract: The present disclosure relates to a washing machine with a drying function, capable of performing a washing program and a drying program, comprising a cabinet (1), a tub (9) in the cabinet, a water inlet (11) for feeding water to the tub during the washing program, the water inlet being connected to an anti-siphoning device (27), and a water trap (29) placed in the connection between the water inlet (11) and the anti-siphoning device.Type: ApplicationFiled: June 2, 2008Publication date: October 14, 2010Applicant: AKTIEBOLAGET ELECTROLUXInventors: Leif Persson, Anders Brun, Jorgen Martinsson, Johnny Persson, Johnny Olssen
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Publication number: 20100229607Abstract: The present disclosure relates to a washing machine with a drying function, capable of performing a washing program and a drying program. The machine comprises a cabinet (1), a tub (9) in the cabinet and a door (3), through which access to the tub interior can be achieved, and further an air evacuation chamber (37) which comprises an upper section (59) and a lower section (57), wherein the upper section is connected to the tub in order to allow an air flow from the tub to the upper section, and the upper section is connected to the lower section at a connection point which is higher than the maximum water level during the washing program, such that air can flow to the lower section during the drying program while water is prevented from flowing from the tub to the lower section during the washing program. This allows the lower part to contain parts of the drying system that are to be kept dry, which allows a more compact machine to be built.Type: ApplicationFiled: June 2, 2008Publication date: September 16, 2010Applicant: AKTIEBOLAGET ELECTROLUXInventors: Leif Persson, Anders Brun, Jorgen Martinsson, Johnny Persson, Johnny Olssen
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Patent number: 7669589Abstract: A self propelled concrete saw compensates for blade cutting resistance, for example by adjusting a movable drive assembly. An actuator may be used to move the drive assembly, for example through the operation of a control switch by an operator.Type: GrantFiled: July 8, 2005Date of Patent: March 2, 2010Assignee: Husqvarna Outdoor Products Inc.Inventors: Michael Kingsley, Douglas Dempsey, Donald F. Meister, Leif Persson
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Publication number: 20060060179Abstract: A self propelled concrete saw compensates for blade cutting resistance, for example by adjusting a movable drive assembly. An actuator may be used to move the drive assembly, for example through the operation of a control switch by an operator.Type: ApplicationFiled: July 8, 2005Publication date: March 23, 2006Inventors: Michael Kingsley, Douglas Dempsey, Donald Meister, Leif Persson
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Patent number: 6973909Abstract: A system for an internal combustion engine (10) arranged for being powered with a fuel mixed with a lubricant, which system includes:—a detector (16) arranged for detecting the presence of a given additive in the lubricant mixed fuel—an electronic module (24) arranged for comparing the detected presence of the additive with a predetermined threshold value, and designed so that if the lubricant is not mixed in the fuel, or has been mixed in the fuel in an amount lower than a through the additive against the threshold value correlated amount, by means of an indicator (30) indicate that a lack of lubricant is at hand in the fuel and/or by means of a connection (26) to an ignition or injection system (11) for the engine (10) prevent or modify the operation of the internal combustion engine if said lack of lubricant is at hand in the fuel. The invention also refers to the method of how the system operates.Type: GrantFiled: April 8, 2003Date of Patent: December 13, 2005Inventor: Leif Persson
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Publication number: 20050150479Abstract: A system for an internal combustion engine (10) arranged for being powered with a fuel mixed with a lubricant, which system includes:—a detector (16) arranged for detecting the presence of a given additive in the lubricant mixed fuel—an electronic module (24) arranged for comparing the detected presence of the additive with a predetermined threshold value, and designed so that if the lubricant is not mixed in the fuel, or has been mixed in the fuel in an amount lower than a through the additive against the threshold value correlated amount, by means of an indicator (30) indicate that a lack of lubricant is at hand in the fuel and/or by means of a connection (26) to an ignition or injection system (11) for the engine (10) prevent or modify the operation of the internal combustion engine if said lack of lubricant is at hand in the fuel. The invention also refers to the method of how the system operates.Type: ApplicationFiled: April 8, 2003Publication date: July 14, 2005Inventor: Leif Persson
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Patent number: 6387226Abstract: A device for treating water that circulates in a closed conduit system, said device comprising a combination of a degasifier, on the one hand, and a corrosion inhibitor, on the other hand. The degasifier includes a tubular member (10) which is horizontal in its use position and which is intended to be connected in series with a conduit (13, 14) forming part of the conduit system. The tubular member is surrounded between its upstream and downstream ends (11, 12) by a housing (17) which includes an openable upper gas outlet (16). The tubular member communicates with the surrounding housing space through the medium of at least one aperture (15) provided therein. The corrosion inhibitor includes a sacrificial anode (20) which is positioned in the housing space outside the tubular member (10). The housing (17) also includes an openable bottom drain or outlet (28).Type: GrantFiled: May 22, 2000Date of Patent: May 14, 2002Assignee: Avonni ABInventor: Leif Persson
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Patent number: 6018988Abstract: A method for determining the rheological properties of a sample substance by the use of a rheometer, in which at least one element having magnetoelastic characteristics is received in said sample substance. The element is set into mechanical oscillation by the influence of a magnetic field and its oscillation characteristics are determined by the effect exerted by the oscillation of the element on an outer magnetic field which, in turn, provides information regarding the rheological properties of the sample substance. The device comprises a receptacle for the sample substance and the element. An exciting coil array is provided for exciting the element, thus causing it to oscillate mechanically; and a sensing coil array is provided to register the effect of the element on an existing magnetic field image during oscillation of the element.Type: GrantFiled: February 25, 1998Date of Patent: February 1, 2000Assignee: Hansson Thyresson Patentbyra ABInventor: Leif Persson
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Patent number: 5728349Abstract: A material primarily for sport-shooting ammunition, both pellet ammunition and ball ammunition, including at least the materials zinc and bismuth. The ammunition material includes above 55 percent by weight zinc and the remainder bismuth and tin, where the amount of tin present does not exceed about 10 percent by weight tin.Type: GrantFiled: October 20, 1995Date of Patent: March 17, 1998Inventor: Leif Persson
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Patent number: 5576693Abstract: The invention relates to a method and a device for remote sensing of objects, said method including the steps of marking said objects with at least one label (10) comprising at least one electrical resonant circuit (14) having an induction means (11) and a capacitor means (12), exciting said resonant circuit (14) to resonance at a resonant frequency, and detecting said resonant frequency of said resonant circuit (14) by the electromagnetic energy transmitted from said resonant circuit (14). An element (13) of a magnetic material having a varying permeability is coupled inductively to said induction element (11). The resonant frequency of said resonant circuit (14) is affected by the permeability of said element (13) of magnetic material, and said element (13) of magnetic material is exposed to an external and spatially heterogenous magnetic bias field through which the permeability of said element (13) of magnetic material is controlled.Type: GrantFiled: September 6, 1994Date of Patent: November 19, 1996Assignee: RSO Corporation N.V.Inventors: Carl Tyren, Leif Persson
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Patent number: 5557085Abstract: Electronic identification device includes a circuitry (10) for generating and emitting an electromagnetic field and a plurality of transponder units (11). Each of the transponder unit includes a storing circuitry (12) for storing identification data, and a transmitting circuitry (13) for transmitting a signal including the identification data when the transponder unit (11) has been exposed to the electromagnetic field. The electronic identification device further includes a receiving circuitry (14) for receiving the signal and for decoding the identification data. At least one element (15) of a material, having the magnetic or electrical properties being influenced by external magnetic fields, is disposed on or in the absolute vicinity of the transponder unit (11), and a magnetic field generating circuitry (16) for generating a magnetic field is provided at an interrogation zone (17) to activate any element (15) appearing in the interrogation zone (17).Type: GrantFiled: September 6, 1994Date of Patent: September 17, 1996Assignee: RSO Corporation N.V.Inventors: Carl Tyren, Leif A. Persson
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Patent number: 5551158Abstract: Method for position measurement, whereby a magnetic field is generated in a measuring volume comprising one or several elongated elements of amorphous material, the magnetic properties of which being influenced by the magnetic field, is arranged in the measuring volume. The measuring volume is composed of several sub-volumes, and the extension of the sub-volumes in the desired measuring direction is chosen in such a way that the extension corresponds to the desired measuring resolution in the measuring directions. The change in magnetic or mechanical properties of the element caused by the magnetic flux intensity in the respective sub-volume along the longitudinal direction of the element is detected, the change being a measure of the position of the element.Type: GrantFiled: September 6, 1994Date of Patent: September 3, 1996Assignee: RSO Corporation N.V.Inventors: Carl Tyren, Leif A. Persson
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Patent number: 5001458Abstract: A method and an arrangement of automatic remote identification of separate objects or separate objects in a set of objects, each object being provided with identifier means comprising identifiers made by material with high magnetomechanical coupling, the identifiers preferably comprising a plurality of strips of said material, the resonant frequency thereof being tuned to correspond to the desired information specific to the object, said objects being disposed in an interrogation zone when identification is requested.Type: GrantFiled: February 13, 1989Date of Patent: March 19, 1991Inventors: Carl H. Tyren, Leif A. Persson
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Patent number: 4759288Abstract: A printer, which is especially adapted for printing a bar code on label paper has a housing having a front panel with some operation buttons and a winding drawer having a protruding label table. The printer prints a bar code and alphanumeric numerals on a label which is fed to the label table for then being applied to goods. The printer also can be connected to an external computer or the like for obtaining the information to be printed on the label. The printer also has an internal processor and a memory for maintaining certain necessary information. The winding drawer has a winding roller and a deflection roller on a pivotable operation lever. The deflection roller deflects ground paper of the label paper over a dispenser edge in a first position of the operation lever, so that a label formerly on the ground paper is delivered straight ahead while the ground paper is deflected downwards to the winding roller operation.Type: GrantFiled: July 23, 1986Date of Patent: July 26, 1988Assignee: Ecupan ABInventor: Leif Persson