Patents by Inventor Alan Farrington

Alan Farrington 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 reutilizing kraft spent liquor
    Patent number: 4334956
    Abstract: A method of utilizing kraft black liquor by converting the black liquor to "green liquor" and then oxidizing the green liquor with air in the presence of a quinone compound or spent liquor from the kraft process, the soda semi-chemical process or the neutral sulfite semi-chemical process as a catalyst. A marked improvement in the rate of oxidation is obtained. The thus oxidized green liquor is then able to be used as part at least of the digestion liquor in the NSSC process.
    Type: Grant
    Filed: November 20, 1980
    Date of Patent: June 15, 1982
    Assignee: Australian Paper Manufacturers Limited
    Inventors: Alan Farrington, Peter F. Nelson
  • Pulping with quinones and hydroquinones
    Patent number: 4213821
    Abstract: A process for the delignification of lignocellulosic material is described wherein the lignocellulosic material is cooked with an alkaline or neutral sulphite pulping liquor, and there is added to the pulping liquor at least 0.001% by weight of an additive compound or mixture of additive compounds selected from quinones and hydroquinones.
    Type: Grant
    Filed: May 25, 1977
    Date of Patent: July 22, 1980
    Assignee: Australian Paper Manufacturers Limited
    Inventors: Naphtali N. Vanderhoek, Peter F. Nelson, Alan Farrington
  • Method for the delignification of lignocellulosic material in an amine delignifying liquor containing a quinone or hydroquinone compound
    Patent number: 4178861
    Abstract: A delignification process using amine cooking liquors which also contain a quinoid or hydroquinoid compound. The process also encompasses a pretreatment step using the quinoid or hydroquinoid compounds.
    Type: Grant
    Filed: December 13, 1977
    Date of Patent: December 18, 1979
    Assignee: Australian Paper Manufacturers Limited
    Inventors: Naphtali Vandernoek, Peter F. Nelson, Alan Farrington
  • Pulping with quinones and hydroquinones
    Patent number: RE32203
    Abstract: A process for the delignification of .Iadd.softwood .Iaddend.lignocellulosic material is described wherein the lignocellulosic material is cooked with .[.an alkaline or.]. .Iadd.a .Iaddend.neutral sulphite pulping liquor, and there is added to the pulping liquor at least 0.001% by weight of an additive compound or mixture of additive compounds selected from quinones and hydroquinones.
    Type: Grant
    Filed: October 24, 1984
    Date of Patent: July 15, 1986
    Assignee: Australian Paper Manufacturers Limited
    Inventors: Naphtali N. Vanderhoek, Peter F. Nelson, Alan Farrington