Patents by Inventor Bertil K. Ernerfeldt

Bertil K. Ernerfeldt 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: 5116475
    Abstract: A method for discharging cooked lignocellulose materials from a digester is disclosed. After batch cooking the lignocellulose material in the digester is cooled to a temperature of about 100.degree. C., preferably from 100.degree. to 120.degree. C., a gas is supplied to the upper portion of the digester to provide a gas pressure such that the combination of that gas pressure and the static pressure in the digester created by the height of cooked lignocellulose material therein exceeds by no greater than about 200 kPa the sum of the pressure required to overcome the level difference between the exit port at the bottom of the digester and an entrance port in the upper portion of a receiving vessel and the flow resistance required to transfer the cooked lignocellulose material therethrough.
    Type: Grant
    Filed: September 26, 1990
    Date of Patent: May 26, 1992
    Assignee: Sunds Defibrator Industries Aktiebolag
    Inventors: Runo E. G. Edlund, Bertil K. Ernerfeldt