Patents by Inventor Allan F. Gilbert

Allan F. Gilbert 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).

  • Process for removal of potassium values from pulp mill liquors
    Patent number: 4249990
    Abstract: The accumulation of potassium values in a closed cycle pulp mill process usually using sodium hydroxide as a pulping chemical is prevented by removal of potassium values as potassium chloride by crystallization. A variety of procedures are described, including coprecipitation from white liquor with sodium chloride followed by separation of the codeposited salts, precipitation from white liquor separate from sodium chloride precipitation, and intermittent precipitation from green liquor with intermittent precipitation of sodium chloride from white liquor.
    Type: Grant
    Filed: April 2, 1979
    Date of Patent: February 10, 1981
    Assignee: ERCO Envirotech Ltd.
    Inventors: Allan F. Gilbert, W. Howard Rapson