Patents by Inventor Michael I. Lees

Michael I. Lees 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 thermochemical treatment
    Patent number: 4900371
    Abstract: Known techniques of plasma case hardening of workpieces may fail to provide sufficient treatment to re-entrant portions, such as fine holes, in the workpiece. This specification discloses a technique of pulsed plasma treatment in which the duration of the plasma pulses and the intervals between them are selected to allow a substantially even distribution of the gas which forms the plasma over all the surface to be treated of the workpiece.
    Type: Grant
    Filed: October 16, 1987
    Date of Patent: February 13, 1990
    Assignee: The Electricity Council
    Inventors: Amos C. Dexter, Michael I. Lees, Barry J. Taylor