Patents by Inventor Hakan Kelvesjo

Hakan Kelvesjo 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).

  • Method and a device for detecting slag
    Patent number: 7639150
    Abstract: A method and device are provided for detecting the presence of slag in a shroud through which molten metal passed from a ladle to a tundish. An induced voltage generated at a receiving coil is compared with a defined voltage range. If the induced voltage has a value outside the defined voltage range, it is indicative of the presence of slag. The voltage range is defined in dependence of the flow of molten metal passing through the shroud. A casting plant is also provided.
    Type: Grant
    Filed: April 23, 2004
    Date of Patent: December 29, 2009
    Assignee: MPC Metal Process Control AG
    Inventors: Mats Jalk, Willy Ohlsson, Håkan Kelvesjö
  • Method and a device for detecting slag
    Publication number: 20060266796
    Abstract: A method and device are disclosed for detecting the presence of slag in a shroud through which molten metal passed from a ladle to a tundish. An induced voltage generated at a receiving coil is compared with a defined voltage range. If the induced voltage has a value outside the defined voltage range, it is indicative of the presence of slag. The voltage range is defined in dependence of the flow of molten metal passing through the shroud. A casting plant is also disclosed.
    Type: Application
    Filed: April 23, 2004
    Publication date: November 30, 2006
    Inventors: Mats Jalk, Willy Ohlsson, Hakan Kelvesjo
  • Method and a device for detecting slag
    Publication number: 20060219052
    Abstract: The invention relates to a method and a device of detecting the presence of slag in a shroud (4) through which molten metal passes from a ladle (2) to a tundish (6). A transmitting coil (20) generates an electromagnetic field. An induced voltage generated at a receiving coil (24) is compared with a defined voltage range. If the induced voltage has a value outside the defined voltage range it is indicative of the presence of slag. The coils (20,24) are arranged in an unmovable manner in relation to the shroud. The invention also relates to a casting plant.
    Type: Application
    Filed: June 7, 2004
    Publication date: October 5, 2006
    Inventors: Mats Jalk, Willy Ohlsson, Håkan Kelvesjö
  • Metal flow control
    Patent number: 7013949
    Abstract: A method and a system are for the control of a gas-containing hidden flow of molten metal in a space defined by a tubular device. From measurements in at least one predetermined layer of the metal flow in the space, an indication is obtained of the appearance of the flow which is compared with stored values. The result of the comparison is used for controlling at least one flow-affecting parameter in such a manner that a desired type of flow is provided at least in the layer.
    Type: Grant
    Filed: October 26, 2001
    Date of Patent: March 21, 2006
    Assignee: MPC Metal Process Controll AB
    Inventors: Michel Cervantes, Mats Jalk, Håkan Kelvesjö, Willy Ohlsson
  • Metal flow control
    Publication number: 20040026064
    Abstract: A method and a system are for the control of a gas-containing hidden flow of molten metal in a space defined by a tubular device. From measurements in at least one predetermined layer of the metal flow in the space, an indication is obtained of the appearance of the flow which is compared with stored values. The result of the comparison is used for controlling at least one flow-affecting parameter in such a manner that a desired type of flow is provided at least in the layer.
    Type: Application
    Filed: May 2, 2003
    Publication date: February 12, 2004
    Inventors: Michel Cervantes, Mats Jalk, Hakan Kelvesjo, Willy Ohlsson
  • Method and apparatus for non-contact measuring of metal bed parameters
    Patent number: 6538433
    Abstract: In a method and device for measuring at least one parameter of a metal bed, measuring is obtained by a magnetic field being generated from one side of the metal bed so that eddy currents are generated in the metal bed as the metal bed moves relative to the magnetic field. The metal bed and the magnetic field are made to move relative to one another. A force related to the eddy currents affects a body and the action of the force on the body is detected by a detecting device, the detected force being a function of a desired parameter of the metal bed.
    Type: Grant
    Filed: October 30, 2001
    Date of Patent: March 25, 2003
    Assignee: MPC Metal Process Control AB
    Inventors: Michel Cervantes, Christer Enström, Håkan Kelvesjö, Willy Ohlsson