Patents by Inventor Paul C. Keenan, III

Paul C. Keenan, III 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 calibrating optical sensors
    Patent number: 4836682
    Abstract: A self calibrating optical sensor is described in which a time varying response signal is provided which is a function of the reflectivity of a surface being detected and the overall response of the photodetector circuit. This response time is stored to establish a reference value to ascertain similar reflective surface are present.
    Type: Grant
    Filed: July 2, 1986
    Date of Patent: June 6, 1989
    Assignee: E. I. DuPont De Nemours and Company
    Inventor: Paul C. Keenan, III
  • Automatic control system for X-ray film cassette loader and unloader apparatus
    Patent number: 4553369
    Abstract: An automatic X-ray film unloading and loading apparatus is actuated by sensing indicia on the cassette to perform various operations on the cassette and/or the film therein.
    Type: Grant
    Filed: November 18, 1983
    Date of Patent: November 19, 1985
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Michael H. Debes, Paul C. Keenan, III