Patents by Inventor Matti Hiltunen

Matti Hiltunen 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: 7000117
    Abstract: In a method and system for authenticating locally-stored program code, a first checksum is computed using the locally-stored program code, the computed checksum is compared with a second checksum known to be valid and, if the two checksums are determined to match, the locally-stored program code is deemed valid and authentic. For increased certification reliability and dependability, before computation of the first checksum a predetermined challenge is added to the stored program code, so that the first checksum is computed from the combination of the stored program code and the challenge. This enhancement enables secure use of stored program code in applications that demand high security. Users of such software may therefore rely on the authenticity of the data processed by the software and of the data and results reported on the display of a mobile phone or keyboard throughout the entire process or transaction.
    Type: Grant
    Filed: November 12, 2001
    Date of Patent: February 14, 2006
    Assignee: Sonera Smarttrust Oy
    Inventors: Matti Hiltunen, Jarmo Miettinen, Marko Nordberg, Jukka Liukkonen
  • Publication number: 20030078058
    Abstract: The inventive method enables the signing and/or encrypting of a message to be transmitted from a sending party to a receiving party over a telecommunication network with the ability to ascertain from the message the identity of the sender and the integrity of the message contents. The message for transmission is divided into at least a header section, to which a sender identification is added, and a data section, to which a check element generated from the contents of the message is appended. The data section of the message is then signed and/or encrypted so as to permit the receiver to reliably identify the identity of the sender. Use of the check element additionally permits confirmation that the message contents have not been unintendedly modified or corrupted and that the message has been decrypted using the correct decryption key.
    Type: Application
    Filed: August 16, 2001
    Publication date: April 24, 2003
    Inventors: Harri Vatanen, Jukka Liukkonen, Matti Hiltunen
  • Publication number: 20020091938
    Abstract: In a method and system for authenticating locally-stored program code, a first checksum is computed using the locally-stored program code, the computed checksum is compared with a second checksum known to be valid and, if the two checksums are determined to match, the locally-stored program code is deemed valid and authentic. For increased certification reliability and dependability, before computation of the first checksum a predetermined challenge is added to the stored program code, so that the first checksum is computed from the combination of the stored program code and the challenge. This enhancement enables secure use of stored program code in applications that demand high security. Users of such software may therefore rely on the authenticity of the data processed by the software and of the data and results reported on the display of a mobile phone or keyboard throughout the entire process or transaction.
    Type: Application
    Filed: November 12, 2001
    Publication date: July 11, 2002
    Inventors: Matti Hiltunen, Jarmo Miettinen, Marko Nordberg, Jukka Liukkonen
  • Patent number: 5911956
    Abstract: A method of reducing the nitrogen oxide level in the flue gases issuing from combustion units by introduction of reducing agents into contact with gases containing nitrogen oxides in first and second reducing stages, is provided. The first reducing stage is a non-catalytic stage (e.g. at temperatures over 800.degree. C.), while the second stage is a catalytic stage (e.g. at temperatures of about 300-400.degree. C.). A steam generation boiler with improved nitrogen reduction facilities is also provided. The amount of nitrogen oxides in the hot gases is reduced in the combination of the first and second reducing stages while producing steam in a steam generation boiler system, thus resulting in gases essentially free from nitrogen oxides while eliminating the possibility of NH.sub.3 (or other reducing agent) slip in the exhausted flue gases. Heat transfers in a convection section as used to establish stabilized temperature conditions for catalytic reduction.
    Type: Grant
    Filed: November 26, 1997
    Date of Patent: June 15, 1999
    Assignee: Foster Wheeler Energia Oy
    Inventors: Charles Viel Lamare, Matti Hiltunen, Yam Lee
  • Patent number: 5626088
    Abstract: Method and apparatus for using biofuel or waste material or both for energy production. The biofuel or the waste material is gasified in a fluidized bed gasifier (10), preferably a circulating fluidized bed gasifier. The gas produced in the gasifier is introduced into a boiler (12) equipped with fossil fuel burners (28, 28'28"), typically burners for pulverized coal. The gas is introduced at a level above the burners. Ash from the boiler may be used to form the bed of the gasifier. For control of NO.sub.x, the gas is burned in the upper part of the boiler at a low temperature level of 800.degree.-1050.degree. C. (1472.degree.-1922.degree. F.), preferably 850.degree.-900.degree. C. (1562.degree.-1652.degree. F.), and with a small excess air content of about 5-10 percent. In a second embodiment, the raw gas may be cleaned of harmful or noxious components, and cooled if desired, between the gasifier and the boiler in an additional circulating fluidized bed reactor (152) having a bed of coal ash.
    Type: Grant
    Filed: November 28, 1995
    Date of Patent: May 6, 1997
    Assignee: Foster Wheeler Energia OY
    Inventors: Matti A. Hiltunen, Jorma J. Nieminen
  • Patent number: 5562884
    Abstract: The amount of N.sub.2 O emission from a fluidized bed reactor is reduced by adding a hydrogen radical providing additive (e.g. a hydrogen containing fuel such as natural gas or alcohol) to the flue gases discharged from the fluidized bed. Sufficient oxygen is present in the flue gases--either by addition with the additive, or by addition of an excess to the combustion chamber--so that the additive reacts with the oxygen, typically raising the temperature of the flue gases (e.g. from about 700.degree.-900.degree. C. to about 950.degree.-1100.degree. C.) so that N.sub.2 O production is reduced about 10-90%. The additive may be injected in or just prior to a cyclone for separating particles from the flue gases, in a gas discharge immediately after the cyclone (e.g. just downstream of a heat exchanger for cooling the flue gases and flattening the velocity profile of the flue gases), just prior to a superheater of a convection section, or in a combustion chamber just prior to a gas turbine.
    Type: Grant
    Filed: May 31, 1995
    Date of Patent: October 8, 1996
    Assignee: A. Ahlstrom Corporation
    Inventors: Eric J. Oakes, Yam Y. Lee, Matti A. Hiltunen
  • Patent number: 5505907
    Abstract: A method and apparatus for cooling hot gas in a reactor in which the lower section of the reactor is provided with an inlet for hot gas and a chamber encompassing a bubbling fluidized bed. A central section of the reactor is provided with a riser, and the upper section with a gas outlet, and the reactor has heat transfer surfaces for recovering heat from solid particles. The riser is defined by vertical walls which are disposed above the bubbling fluidized bed so that they divide the fluidized bed into concentric outer and inner parts. From the inner part of the fluidized bed solid particles are supplied to the hot inlet gas for cooling thereof. The gas containing solid particles is conveyed through the riser into the upper section of the reactor, where solid particles are separated from the gas in a particle separator and returned to the fluidized bed into the outer part thereof.
    Type: Grant
    Filed: June 22, 1994
    Date of Patent: April 9, 1996
    Assignee: A. Ahstrom Corporation
    Inventors: Matti Hiltunen, Timo Hyppanen, Kurt Westerlund
  • Patent number: 5481063
    Abstract: The present invention relates to a method of treating various chlorine-containing materials such as wastes, biological sludges and even metal concentrates in a circulating fluidized bed reactor (1) or a grate furnace at a high temperature of over 830.degree. C. and of cooling the resultant process gases for minimizing the amount of polyhalogenated aromatic compounds in the process gases. The process gases are cooled to a temperature below 250.degree. C. at a cooling velocity exceeding 1000.degree. C. per second. Cooling is preferably effected in a circulating fluidized bed reactor (2).
    Type: Grant
    Filed: November 22, 1991
    Date of Patent: January 2, 1996
    Assignee: A. Ahlstrom Corporation
    Inventors: Matti Hiltunen, Harry Lampenius, Kurt Westerlund
  • Patent number: 5465690
    Abstract: A method of reducing the nitrogen oxide level in the flue gases issuing from combustion units by introduction of reducing agents into contact with gases containing nitrogen oxides in first and second reducing stages, is provided. The first reducing stage is a non-catalytic stage (e.g. at temperatures over 800.degree. C.), while the second stage is a catalytic stage (e.g. at temperatures of about 300.degree.-400.degree. C.). A steam generation boiler with improved nitrogen reduction facilities is also provided. The amount of nitrogen oxides in the hot gases is reduced in the combination of the first and second reducing stages while producing steam in a steam generation boiler system, thus resulting in gases essentially free from nitrogen oxides while eliminating the possibility of NH.sub.3 (or other reducing agent) slip in the exhausted flue gases. Heat transfers in a convection section as used to establish stabilized temperature conditions for catalytic reduction.
    Type: Grant
    Filed: April 12, 1994
    Date of Patent: November 14, 1995
    Assignee: A. Ahlstrom Corporation
    Inventors: Charles Viel Lamare, Matti Hiltunen, Yam Lee
  • Patent number: 5443654
    Abstract: A fluidized bed gas cooler assembly includes a fluidized bed gas cooler with a metal inlet duct for directing hot process or flue gases into the cooler as fluidizing gas. In order to remove deposits which form on the duct inner surface a cooling fluid is passed into and then out of contact with the outer surface of the inlet duct so that the cooling fluid increases in temperature (but does not change phase) and so that deposits which form on the inlet duct interior surface become brittle and readily disengageable. The deposits are disengaged at different times by pulsation of the cooling fluid (especially where the inlet duct is a metal spiral tube), effecting pulsation of the temperature of the cooling fluid, or subjecting an enclosure surrounding the duct or the exterior surface of the duct itself to a sudden mechanical force.
    Type: Grant
    Filed: January 24, 1994
    Date of Patent: August 22, 1995
    Assignee: A. Ahlstrom Corporation
    Inventors: Matti A. Hiltunen, Ossi Ikonen
  • Patent number: 5441714
    Abstract: The amount of N.sub.2 O emission from a fluidized bed reactor is reduced by adding a hydrogen radical providing additive (e.g. a hydrogen containing fuel such as natural gas or alcohol) to the flue gases discharged from the fluidized bed. Sufficient oxygen is present in the flue gases--either by addition with the additive, or by addition of an excess to the combustion chamber--so that the additive reacts with the oxygen, typically raising the temperature of the flue gases (e.g. from about 700.degree.-900.degree. C. to about 950.degree.-1100.degree. C.) that is from about 1292.degree.-1652.degree. F. to about 1742.degree.-2012.degree. F. so that N.sub.2 O production is reduced about 10-90%. The additive may be injected in or just prior to a cyclone for separating particles from the flue gases, in a gas discharge immediately after the cyclone (e.g.
    Type: Grant
    Filed: January 8, 1992
    Date of Patent: August 15, 1995
    Assignee: A. Ahlstrom Corporation
    Inventors: Eric J. Oakes, Yam Y. Lee, Matti A. Hiltunen
  • Patent number: 5380507
    Abstract: A method of cooling hot flue or process gases containing halogenous compounds in two successively located circulating fluidized bed reactors. In the first reactor the gases are cooled to a temperature of >400.degree. C. In the second reactor the gases are rapidly cooled to below a temperature zone of 250.degree.-400.degree. C. In the first reactor the gases are brought into contact with a catalytic material capable of destroying polyhalogenous compounds. A retention time of 1-10 seconds, preferably 2-5 seconds, is provided for the gases in the first reactor.
    Type: Grant
    Filed: July 20, 1992
    Date of Patent: January 10, 1995
    Assignee: A. Ahlstrom Corporation
    Inventors: Matti Hiltunen, Kurt Westerlund
  • Patent number: 5133950
    Abstract: The amount of N.sub.2 O emission from a fluidized bed reactor is reduced by adding a hydrogen radical providing additive (e.g. a hydrogen containing fuel such as natural gas or alcohol) to the flue gases discharged from the fluidized bed. Sufficient exygen is present in the flue gases--either by addition with the additive, or by addition of an excess to the combustion chamber--so that the additive reacts with the oxygen, typically raising the temperature of the flue gases (e.g. from about 700.degree.-900.degree. C. to about 950.degree.-1100.degree. C.) so that N.sub.2 O production is reduced about 10-90%. The additive may be injected in or just prior to a cyclone for separating particles from the flue gases, in a gas discharge immediately after the cyclone (e.g. just downstream of a heat exchanger for cooling the flue gases and flattening the velocity profile of the flue gases), just prior to a superheater of a convection section, or in a combustion chamber just prior to a gas turbine.
    Type: Grant
    Filed: May 3, 1991
    Date of Patent: July 28, 1992
    Assignee: A. Ahlstrom Corporation
    Inventors: Eric J. Oakes, Lee Y. Yam, Matti A. Hiltunen
  • Patent number: 5043150
    Abstract: The amount of N.sub.2 O emission from a fluidized bed reactor is reduced by adding a hydrogen radical providing additive (e.g. a hydrogen containing fuel such as natural gas or alcohol) to the flue gases discharged from the fluidized bed. Sufficient oxygen is present in the flue gases--either by addition with the additive, or by addition of an excess to the combustion chamber--so that the additive reacts with the oxygen, typically raising the temperature of the flue gases (e.g. from about 700.degree.-900.degree. C. to about 950.degree.-1100.degree. C.) so that N.sub.2 O production is reduced about 10-90%. The additive may be injected in or just prior to a cyclone for separating particles from the flue gases. In a gas discharge immediately after the cyclone, just prior to a superheater of a convection section, or in a combustion chamber just prior to a gas turbine.
    Type: Grant
    Filed: April 17, 1990
    Date of Patent: August 27, 1991
    Assignee: A. Ahlstrom Corporation
    Inventors: Matti A. Hiltunen, Yam Y. Lee, Eric J. Oakes
  • Patent number: 4940007
    Abstract: In a fast fluidized bed reactor having, in a lower region, downwardly and inwardly inclined walls, a change in the direction of the wall surface or a ledge or protrusion is provided to change the direction of the particles flowing downwardly adjacent the wall for directing the particles inwardly away from the wall and into the region acted on by the nozzles providing the fluidizing gas. The change of direction, abutment or projection is preferably provided along the refractory wall surface at an elevation 200-1100 mm above the grid plate. In this manner, clogging of the nozzles is prevented and more efficient and effective fluidization and combustion processes occur.
    Type: Grant
    Filed: August 16, 1988
    Date of Patent: July 10, 1990
    Assignee: A. Ahlstrom Corporation
    Inventors: Matti Hiltunen, Ragnar Lundqvist, Juha Sarkki