Patents by Inventor Ernest K. C. Yu

Ernest K. C. Yu 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 of treatment of waste paper with steam
    Patent number: 5122228
    Abstract: Method is disclosed of treatment of waste paper or the like at high temperatures in the range of 160.degree. C. to about 230.degree. C. The furnish is treated in a digester with or without added chemicals but in the presence of saturated steam. The preferred dwell times are in the range of about 1 minute to about 6 minutes. The treated furnish is then discharged from the digester, preferably, but not exclusively, by an explosive discharge.The advance in the art is in an improved de-inking effect, reduced consumption of chemicals and power. Also, some furnishes previously unsuitable for re-cycling, have been successfully processed by the method of the invention.
    Type: Grant
    Filed: December 10, 1990
    Date of Patent: June 16, 1992
    Assignees: Stake Technology Limited, Chesapeake Resources Company
    Inventors: Michael P. Bouchette, Ernest K. C. Yu
  • Production of thermostable xylanase and cellulase
    Patent number: 4966850
    Abstract: The present invention provides for the use in the production of cellulolytic and xylanolytic enzymes, particularly xylanase and cellulase, of the microorganism Thermoascus aurantiacus in a culture medium containing at least one of a cellulose or hemicellulose substrate whereby to produce thermostable enzymes, particularly cellulase and xylanase.
    Type: Grant
    Filed: April 19, 1989
    Date of Patent: October 30, 1990
    Assignee: Forintek Canada Corp.
    Inventors: Ernest K. C. Yu, Larry U. L. Tan, John N. Saddler