Patents by Inventor Hakan Karlsson
Hakan Karlsson 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: 6520343Abstract: The present invention relates to a filtering device for preventing passing and blocking of unwanted particles in a suspension, which filtering device comprises an inlet and an outlet and a defined space between the inlet and the outlet, wherein the device comprises a filter means arranged in the outlet, that the filter means is arranged with openings, that the size of the openings permit particles of a size smaller than the openings to pass through, and at least one nozzle connected to a pressurised liquid source, capable of delivering a liquid jet, and arranged adjacent said outlet, wherein the said at least one nozzle is arranged such and directed such that particles that engage said filter means are removed therefrom by the liquid jet.Type: GrantFiled: December 22, 2000Date of Patent: February 18, 2003Assignee: Fibertracker ABInventors: Håkan Karlsson, Per-Ivar Fransson
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Publication number: 20020134522Abstract: The present invention relates to a method for producing and testing a fiber bed (39), includes a housing (12), a main inlet passage (14) and a main outlet passage (16), a cavity (18) in said housing in fluid connection with said inlet and outlet passages, a body (20) rotatably arranged in said cavity, said body being arranged with a through-going passage (24) having a first and a second opening, a screen (25) arranged in said through-going passage, and means (40) for measuring properties of the fiber bed.Type: ApplicationFiled: March 25, 2002Publication date: September 26, 2002Applicant: FIBERTRACKER ABInventors: Hakan Karlsson, Per-Ivar Fransson
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Patent number: 6429826Abstract: The present invention relates to the field of arrangements in reflector antennas, and in particular to that part of this field that concerns reflector antennas that include subreflectors. The invention is concerned chiefly with an improved subreflector (5b) which when used in a reflector antenna (1) enables the antenna to obtain a radiation diagram with high suppression of side lobes in both the H-plane and the E-plane. The reflective structure of the subreflector (5b) includes at least two mutually different geometries (15, 17) that have been configured specifically to obtain radiation diagrams with good suppression of side lobes in both the E-plane and the H-plane.Type: GrantFiled: December 27, 2000Date of Patent: August 6, 2002Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Håkan Karlsson, Jonas Flodin
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Publication number: 20020079264Abstract: The present invention relates to a filtering device for preventing passing and blocking of unwanted particles in a suspension, which filtering device comprises an inlet and an outlet and a defined space between the inlet and the outlet, wherein the device comprises a filter means arranged in the outlet, that the filter means is arranged with openings, that the size of the openings permit particles of a size smaller than the openings to pass through, and at least one nozzle connected to a pressurised liquid source, capable of delivering a liquid jet, and arranged adjacent said outlet, wherein the said at least one nozzle is arranged such and directed such that particles that engage said filter means are removed therefrom by the liquid jet.Type: ApplicationFiled: December 22, 2000Publication date: June 27, 2002Inventors: Hakan Karlsson, Per-Ivar Fransson
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Patent number: 6312520Abstract: Coating blade for applying coating material onto a travelling web (41), particularly coating liquid onto a travelling paper web, comprising a steel band (3), which, along the edge section (7) intended to engage the web (41), is provided with a wear-resistant coating (5). Said coating is constituted by a material which has a hardness according to Shore A of from about 30 to about 80.Type: GrantFiled: June 14, 1999Date of Patent: November 6, 2001Assignee: BTG Källe Inventing ABInventors: Tore Eriksson, Håkan Karlsson
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Publication number: 20010022838Abstract: The present invention relates to a private telecommunications system comprising a number of switching arrangements (NA, NB) and using an asymmetrical protocol supporting set up of virtual calls between two switching arrangements for transfer of information. Means are provided for creating a call reference in the first switching arrangement (NA) when a first virtual call is to be set up from the first switching arrangement (NA) to a second switching arrangement (NB), storing means being provided in said first and second switching arrangements (NA, NB) for storing said call reference. Said first virtual call is released while all internal connections and the end points related to it are kept, and a second virtual call is set up in the direction opposite to that of the first virtual call using said call reference such that symmetrical transfer of information is enabled between the two switching arrangements (NA, NB).Type: ApplicationFiled: December 14, 2000Publication date: September 20, 2001Inventors: Anders Jacobsson, Arne Ohlsson, Jan Bengtsson, Hakan Karlsson, Ola Andersson, Staffan Sjodin, Ghasem Naghavi
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Publication number: 20010005180Abstract: The present invention relates to the field of arrangements in reflector antennas, and in particular to that part of this field that concerns reflector antennas that include subreflectors. The invention is concerned chiefly with an improved subreflector (5b) which when used in a reflector antenna (1) enables the antenna to obtain a radiation diagram with high suppression of side lobes in both the H-plane and the E-plane. The reflective structure of the subreflector (5b) includes at least two mutually different geometries (15, 17) that have been configured specifically to obtain radiation diagrams with good suppression of side lobes in both the E-plane and the H-plane.Type: ApplicationFiled: December 27, 2000Publication date: June 28, 2001Inventors: Hakan Karlsson, Jonas Flodin
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Patent number: 5986798Abstract: The present invention relates to a method for the periodic domain inversion of ferroelectric flux-grown crystals that are low conductive or made low conductive. The invention also relates to an arrangement for monitoring the domain inversion of crystals while using a laser. The invention also relates to the use of crystals in applications of periodic domain inverted crystals, partly for generating light (electromagnetic radiation) at new wavelengths by non-linear optical frequency mixing (frequency doubling, difference frequency generation, summation frequency generation, optical parametric oscillation, etc.) and partly for electro-optical applications, such as light beam modulation, and partly for acoustic applications. such as the generation of acoustic waves from electric voltages applied across the crystal.Type: GrantFiled: July 10, 1998Date of Patent: November 16, 1999Assignee: Aktiebolaget IOF Institutet for optisk forskningInventors: Hakan Karlsson, Gunnar Arvidsson, Peter Henriksson, Fredrik Laurell
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Patent number: 5572727Abstract: The disclosed system includes a declarative language construct for use in programming telecommunications switching systems, comprised of certain natural language elements such as subjects, predicates and objects. The disclosed system also includes an efficient method for constructing prototype telecommunications system software that provides the capability to handle the real-time and parallel nature of operations in telecommunications systems. In yet another aspect, the disclosed system provides a layered software architecture for use in connection with telecommunications switching systems that enhances overall system functionality.Type: GrantFiled: February 6, 1995Date of Patent: November 5, 1996Assignee: Telefonaktiebolaget L M EricssonInventors: G. Hakan Larsson, Kerstin M. Odling, K. Ake Rosberg, J. Hakan Karlsson
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Patent number: 5388258Abstract: The disclosed system includes a declarative language construct for use in programming telecommunications switching systems, comprised of certain natural language elements such as subjects, predicates and objects. The disclosed system also includes an efficient method for constructing prototype telecommunications system software that provides the capability to handle the real-time and parallel nature of operations in telecommunications systems. In yet another aspect, the disclosed system provides a layered software architecture for use in connection with telecommunications switching systems that enhances overall system functionality.Type: GrantFiled: August 12, 1994Date of Patent: February 7, 1995Assignee: Telefonaktiebolaget LM EricssonInventors: G. Hakan Larsson, Kerstin M. Odling, K. Ake Rosberg, J. Hakan Karlsson
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Patent number: 5331405Abstract: A method for measuring the flexibility of fibers, particularly cellulose fibres, in a flowing suspension. The fibre form of a large number of fibres is registered at two different pictures of suspension flow. A predefined fibre form is calculated for each flow picture, and a relationship, for example the quotient between two measurements of mean fibre form is determined and utilized to define fibre flexibility. The invention also relates to an arrangement for carrying out the inventive method, wherein the arrangement includes a flow-through container (20) through which the suspension flows, a transparent window (26) mounted in the container wall, a CCD-type camera (30) which functions to photograph fibres passing the window, a picture analysis unit (34) coupled to the camera (30), and a data processing unit (36) for processing information obtained from the picture analysis unit (34).Type: GrantFiled: June 24, 1992Date of Patent: July 19, 1994Assignee: STFIInventors: Per-Ivar Fransson, Hakan Karlsson, Lehard Kastre
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Patent number: 3993886Abstract: A supply wave guide system for microwave ovens consists of a wave guide of constant height and continuously varying width, which wave guide is terminated at the wider end by a short-circuiting wall. Microwave energy is fed into the wave guide at its smaller end. Microwave energy is fed from the waveguide into the oven cavity through at least two coupling apertures situated at the wider part of the wave guide and leading directly into the cavity, in which apertures stirrers, preferably movable and in the shape of rotating metallic wings, are situated.Type: GrantFiled: August 30, 1974Date of Patent: November 23, 1976Assignee: U.S. Philips CorporationInventors: Bengt Uno Imberg, Kurt Hakan Karlsson, Gustav Georg Orke
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Patent number: 3985993Abstract: A sealing arrangement for microwave ovens comprising a quarter wave choke situated in the door and having an entrance opening into the choke in the rim portions of the door, which consists of a door frame, and a suitably perforated metallic door sheet covering the space inside the frame. According to the invention the door frame comprises an integral piece of conductive material having, in section, a generally U-shaped configuration, forming said quarter wave choke, with the outer leg of the U shorter than the inner leg, the door sheet is situated in a plane with the outer end of the inner leg of the U, where it is electrically connected to the said leg. The metallic door sheet extends beyond the inner leg and beyond the shorter, outer leg of the U so that the entrance opening to the inside of the U, forming the cavity of the quarter wave choke, is constituted by the gap between the outer shorter leg of the U and the extension of the metallic door sheet.Type: GrantFiled: August 29, 1974Date of Patent: October 12, 1976Assignee: U.S. Philips CorporationInventors: Bengt Uno Imberg, Kurt Hakan Karlsson, Gustav Georg Orke