Patents by Inventor Gerrit G. DeHaas

Gerrit G. DeHaas 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).

  • Spent liquor treatment
    Patent number: 4135968
    Abstract: A process of significantly increasing the capacity of and decreasing the pollution from an existing recovery boiler. The spent liquor is concentrated to 55 to 65 weight % solids and divided into two portions. One portion, containing 10 to 65 weight % of the solids is pyrolyzed, reducing the original fuel value of that portion by 25 to 70%. The remaining carboniferous char and inorganic material is carried to the recovery furnace. The other portion, containing the remainder of the solids, is carried directly to the furnace. The two portions may be combined prior to entering the furnace. In the latter case, the solids content of the combined portion should not be greater than 80 weight %.
    Type: Grant
    Filed: January 31, 1977
    Date of Patent: January 23, 1979
    Assignee: Weyerhaeuser Company
    Inventor: Gerrit G. Dehaas
  • Ammonia-ketone pulping process
    Patent number: 3951734
    Abstract: A method of employing the combination of ammonia and ketones as the cooking chemicals in a digester of a pulping process. This method results in a pulp which has a higher yield than the kraft process yet is characterized by kraft's high strength and fair bleachability. The spent liquor extracts are primarily lignin and contain little cellulose and hemi-cellulose.
    Type: Grant
    Filed: October 11, 1974
    Date of Patent: April 20, 1976
    Assignee: Weyerhaeuser Company
    Inventors: Gerrit G. DeHaas, Charles J. Lang