Patents by Inventor Randy Stern

Randy Stern 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).

  • 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