Patents by Inventor Kenneth F. Henderson

Kenneth F. Henderson 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).

  • Controlling scale in black liquor evaporators
    Patent number: 5407583
    Abstract: An anionic/cationic polymer mixture comprising:(a) a polyanion selected from polyacrylic acid, polymethacrylic acid, and polymaleic anhydride, each optionally copolymerized with each other, or optionally copolymerized with acrylamide up to a molar unit ratio of 1:1, provided that the total polyanionic weight average molecular weight is from about 1 to 5 thousand, and(b) the polycation poly(dimethyldiallylammonium chloride) having a weight average molecular weight of from about 25 thousand to 1 million,wherein the weight ratio of polyanion (a) to polycation (b) is from 1:2 to 1:8, has been found to give excellent inhibition of the formation, deposition and adherence of various alkali metal and alkaline earth metal scales, e.g., sodium sulfate, sodium carbonate and calcium carbonate scales in the stringent conditions which characterize black liquor heaters, evaporators, etc.
    Type: Grant
    Filed: July 15, 1993
    Date of Patent: April 18, 1995
    Assignee: Calgon Corporation
    Inventors: Jasbir S. Gill, Kenneth F. Henderson
  • Composition for controlling scale in black liquor evaporators
    Patent number: 5254286
    Abstract: An anionic/cationic polymer mixture comprising:(a) a polyanion selected from polyacrylic acid, polymethacrylic acid, and polymaleic anhydride, each optionally copolymerized with each other, or optionally copolymerized with acrylamide up to a molar unit ratio of 1:1, provided that the total polyanionic weight average molecular weight is from about 1 to 5 thousand, and(b) the polycation poly(dimethyldiallylammonium chloride) having a weight average molecular weight of from about 25 thousand to 1 million,wherein the weight ratio of polyanion (a) to polycation (b) is from 1:2 to 1:8, has been found to give excellent inhibition of the formation, deposition and adherence of various alkali metal and alkaline earth metal scales, e.g., sodium sulfate, sodium carbonate, and calcium carbonate scales in the stringent conditions which characterize black liquor heaters, evaporators, etc.
    Type: Grant
    Filed: December 10, 1992
    Date of Patent: October 19, 1993
    Assignee: Calgon Corporation
    Inventors: Jasbir S. Gill, Kenneth F. Henderson