Patents by Inventor William H. Mitchell

William H. Mitchell 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).

  • Pharmaceutical tablet vision inspection system
    Patent number: 5085510
    Abstract: A visual inspection system for inspecting pharmaceutical tablets. The system comprises a photoelectric detection means for detecting the light intensity within an inspection area on a tablet and for generating a detection signal which varies with that light intensity. The system also comprises a signal processing means for comparing the detection signal to a predetermined standard in order to generate a selection signal and a transducer means which is responsive to the selection signal. A separation means separates the tablets into at least two groups in accordance with the selection signal. Yet another aspect of this invention is a method for inspecting the surface of pharmaceutical tablets using the above-described vision inspection system.
    Type: Grant
    Filed: August 28, 1990
    Date of Patent: February 4, 1992
    Assignee: Pfizer Inc.
    Inventor: William H. Mitchell