Patents by Inventor Ismo Hirvonen

Ismo Hirvonen 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 apparatus for producing a pyrolysis liquid
    Patent number: 8668811
    Abstract: Disclosed herein is an apparatus and a method for producing a pyrolysis liquid, wherein the pyrolysis liquid is formed by means of pyrolysis from a raw material by forming, and a pyrolysis reactor, a gaseous pyrolysis product by pyrolysis and condensing it in a condenser into a pyrolysis liquid, and feeding circulation gas into the pyrolysis reactor. The circulation gas is conducted by a liquid ring compressor into the pyrolysis reactor and purified before being conducted into the pyrolysis reactor, and the pyrolysis liquid is used as the liquid layer in the liquid ring compressor.
    Type: Grant
    Filed: February 22, 2013
    Date of Patent: March 11, 2014
    Assignee: Metso Power Oy
    Inventors: Sampo Ratinen, Jani Lehto, Mikko Anttila, Tuomo Hilli, Kristin Onarheim, Ismo Hirvonen, Yrjo Solantausta, Markku Raiko
  • Process and device for evaporating liquids, for example black liquor from cellulose cooking, which contain solid and dissolved substances
    Patent number: 6887345
    Abstract: The present invention relates to a process and a device for evaporating liquids, for example black liquor from cellulose cooking, which contain solid and dissolved substances which are to be concentrated. The liquid is heated to close to boiling temperature in a heat exchanger (1) of the falling-film type. The process is characterized in that the pressure on the liquid side in the falling-film heat exchanger (1) is kept so high that boiling does not take place in this heat exchanger and in that the evaporation takes place, by means of flashing, in a separate expansion tank (7) that has a lower steam.
    Type: Grant
    Filed: November 20, 2001
    Date of Patent: May 3, 2005
    Assignee: Kvaerner Pulping AB
    Inventors: Ismo Hirvonen, Randy Stern
  • Process and device for evaporating liquids, for example black liquor from cellulose cooking, which contain solid and dissolved substances
    Publication number: 20040107597
    Abstract: The present invention relates to a process and a device for evaporating liquids, for example black liquor from cellulose cooking, which contain solid and dissolved substances which are to be concentrated, with liquid being heated to close to boiling temperature in a heat exchanger (1) of the falling-film type.
    Type: Application
    Filed: September 22, 2003
    Publication date: June 10, 2004
    Inventors: Ismo Hirvonen, Randy Stern