Patents by Inventor Lars G. Norehall

Lars G. Norehall 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 apparatus for continuously washing aqueous fibrous suspensions and controlling the volume of wash liquid
    Patent number: 4273612
    Abstract: A process is provided for continuously washing fibrous suspensions in aqueous suspending liquors containing dissolved impurities to remove such impurities by exchanging aqueous suspending liquid substantially free from such impurities for the aqueous suspending liquor, which comprises washing fibrous material of the suspension in aqueous suspending liquid substantially free from dissolved impurities; and forming a washed fibrous suspension in such liquid; withdrawing aqueous suspending liquor containing dissolved impurities; diluting the washed fibrous suspension by adding aqueous suspending liquid substantially free from dissolved impurities; measuring the volume amount of such diluting aqueous suspending liquid added; measuring the volume amount of diluted washed fibrous suspension; and then adjusting the volume amount of wash liquid added to maintain substantially constant the difference between the amount of wash liquid added and the liquid content of the undiluted washed fibrous suspension.
    Type: Grant
    Filed: June 8, 1979
    Date of Patent: June 16, 1981
    Assignee: Mo och Domsjo Aktiebolag
    Inventors: Per A. R. Hillstrom, Lars G. Norehall
  • Method and apparatus for continuously washing fibrous suspensions and controlling the volume of wash liquid
    Patent number: 4138313
    Abstract: A process and apparatus are provided for controlling the supply of aqueous suspending liquid in continuously washing fibrous suspensions in aqueous suspending liquors containing dissolved impurities, to remove such impurities by exchanging aqueous suspending liquors substantially free from such impurities for the aqueous suspending liquor, which comprises washing fibrous material of the suspension in aqueous suspending liquid substantially free from dissolved impurities, and forming a washed fibrous suspension in such liquid; withdrawing aqueous suspending liquor containing dissolved impurities; diluting the washed fibrous suspension by adding aqueous suspending liquid substantially free from dissolved impurities; determining the amount of dissolved impurities remaining with the fibrous suspension after the washing has been completed by measuring (1) the volumetric flow rate of the washed suspension; (2) the liquid content of the washed suspension; and (3) the content of dissolved impurities in the suspending
    Type: Grant
    Filed: April 7, 1977
    Date of Patent: February 6, 1979
    Assignee: Mo och Domsjo Aktiebolag
    Inventors: Per A. R. Hillstrom, Lars G. Norehall