Patents by Inventor Henry W. Johnson, Jr.

Henry W. Johnson, Jr. 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).

  • Viscosity measurement
    Patent number: 4286457
    Abstract: A method and apparatus for determining the solution viscosity of polymers using gel partition chromatography (GPC). The method comprises obtaining a GPC analysis of the solution and measuring the pressure drop at a selected point in the GPC flow path. The GPC analysis provides a measure of the polymer concentration in the solution. The viscosity can be determined from the pressure drop in combination with the known polymer concentration.
    Type: Grant
    Filed: March 6, 1980
    Date of Patent: September 1, 1981
    Assignee: Shell Oil Company
    Inventor: Henry W. Johnson, Jr.