Patents by Inventor Alfred U. Boehm

Alfred U. Boehm 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 of cleaning gas cylinders with supercritical fluids
    Patent number: 5440824
    Abstract: The interior of a gas cylinder is cleaned using a supercritical fluid. A treating material, such as carbon dioxide, is injected into the cylinder, and the pressure in the cylinder is increased until the pressure of the treating material exceeds its critical pressure. Then, the cylinder is heated until the temperature of the treating material exceeds its critical temperature. The treating material therefore becomes a supercritical fluid. The treating material is maintained in its supercritical state while the cylinder is rolled for a period of time, while the supercritical fluid dissolves contaminants on the interior surface of the cylinder, and on objects within the cylinder. Then, the supercritical fluid is vented from the cylinder, preferably while the fluid in the cylinder is maintained in its supercritical state.
    Type: Grant
    Filed: September 21, 1993
    Date of Patent: August 15, 1995
    Assignee: MG Industries
    Inventors: Sivaramasubramanian Ramachandran, Alfred U. Boehm