Patents by Inventor W. David Constant

W. David Constant 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 and apparatus for measuring fluid-fluid interfacial rheological properties
    Patent number: 4884437
    Abstract: This invention is a new, novel method and apparatus for the measurement of fluid-fluid interfacial shear viscosities. The method and apparatus are simple in design and conducive to routine measurements. The viscosities are measured by observation of the unsteady state deformation of the interface after a slowly rotating cylindrical cell containing the sample is abruptly halted. The deformation is established with tracer particles located at the interface between the two fluids in the sample. Correlations show the relationship of the traversed angle of the particles to the interfacial shear viscosity, the viscosities and densities of the bulk phases, and the sample dimensions. The method is sufficiently sensitive to allow measurements of interfacial shear viscosities ranging from 0.001 to 5.0 surface poise depending on cell geometry and liquid viscosity.
    Type: Grant
    Filed: August 8, 1988
    Date of Patent: December 5, 1989
    Assignee: Louisiana State University
    Inventors: W. David Constant, Joanne M. Wolcott, Vivian J. Cambridge