Patents by Inventor Leslie L. Randall

Leslie L. Randall 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).

  • Constant-volume sample cutter
    Patent number: 4664004
    Abstract: A cutting device for rubber samples produces constant-volume samples of rubber. The samples are suitable for testing, such as curemeter or rheometer testing, and their constant volume eliminates erratic test results caused by samples which are too large or too small. The device features a sizing mechanism which works in conjunction with a cutter, so as to ensure constant volume samples.
    Type: Grant
    Filed: May 8, 1985
    Date of Patent: May 12, 1987
    Assignee: Monsanto Company
    Inventor: Leslie L. Randall
  • Moving die rheometer, method of testing materials therewith, and die for use therein
    Patent number: 4343190
    Abstract: The rheological properties of a viscoelastic material are measured by enclosing a sample of the material between two die members which have protrusions extending therefrom and intermeshing to form shear zones therebetween. The sample is sheared by displacing one member with respect to the other and the displacement force is measured.A die is provided for the test, and means to bias the die members toward each other, to seal them together, to move one member with respect to the other and to measure the force required for such movement are provided.
    Type: Grant
    Filed: June 2, 1980
    Date of Patent: August 10, 1982
    Assignee: Monsanto Company
    Inventors: Michael J. Danko, Leslie L. Randall, Ray J. Smith, James E. Walsh