Patents by Inventor Gail E. Johnson

Gail E. Johnson 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).

  • Pulp chip fissure test device and method for estimating screened pulp yield
    Patent number: 5970783
    Abstract: The invention consists of a method and apparatus for estimating screened pulp yield using water uptake rate of a sample of screened pulp chips. A dried chip sample is placed in a wire basket and totally immersed in water. A balance records the rate of water uptake over a period of about 35 seconds. This is preferably entered directly into a computer to give an output closely predicting the yield of screened pulp.
    Type: Grant
    Filed: February 20, 1999
    Date of Patent: October 26, 1999
    Assignee: Weyerhaeuser Company
    Inventors: Benjamin E. Levie, Gail E. Johnson, Gevan R. Marrs
  • Bar screen with bars of staggered height
    Patent number: 5368168
    Abstract: A bar screen system comprising two sets of interleaved bars. In each set, the height of the individual bars is staggered so that every third bar is higher than the other bars, which are the same height. The bars are driven such that the bars in one set are approximately 180.degree. behind the other set in their respective predetermined paths of movement, resulting in a tipping and agitation action which tends to present the wood chips loaded at a high rate onto the bar screen in their thickness dimension to the slots between adjacent bars.
    Type: Grant
    Filed: April 26, 1993
    Date of Patent: November 29, 1994
    Assignee: Weyerhaeuser Co.
    Inventors: Gevan R. Marrs, Gail E. Johnson