Patents by Inventor Perry L. Thomas

Perry L. Thomas 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).

  • Sand testing method and apparatus
    Patent number: 6161422
    Abstract: An apparatus (10) and methods for testing the quality of foundry green sand. The apparatus includes three testing stations where filling (60), compaction (80), weighting (94), gas permeability testing (120), moisture testing (40), fracture testing (160), and shear testing (180) occur. Each station is automated and controlled by a computer programmed control system or controller (200). Known foundry sand testing formulas are entered into the system or controller which in turn receives input from each of the testing stations. The condition and quality of the foundry sand is output. A method for testing is also disclosed.
    Type: Grant
    Filed: May 1, 1998
    Date of Patent: December 19, 2000
    Assignee: Hartley Controls Corporation
    Inventors: Perry L. Thomas, Ronald W. Roethlisberger