Patents by Inventor Randal R. Williams

Randal R. Williams 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).

  • Universal calibration standard for surface inspection systems
    Patent number: 4636073
    Abstract: A universal calibration standard for surface inspection systems has a plurality of hemispherical pads which simulate the liquid scattering due to particulate contamination. The hemispherical pads scatter light irrespective of angles of illumination and detection and of rotational orientation, and are fabricated using ball-limiting metallurgical techniques. Any number and sizes of pads can be arranged on a substrate and the standard can be repeatedly cleaned, thereby having a long useful life.
    Type: Grant
    Filed: October 31, 1984
    Date of Patent: January 13, 1987
    Assignee: International Business Machines Corporation
    Inventor: Randal R. Williams