Patents by Inventor John J. Majeski

John J. Majeski 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).

  • Apparatus for optically detecting contamination in particles of low optical-loss material
    Patent number: 5256886
    Abstract: An apparatus for optically detecting light-absorbing contamination in at least one particle of low optical-loss material comprises an optical integrating chamber for containing the particles. A laser for emitting a laser beam to illuminate the particles is mounted in the plane of rotation of a rotating mirror such that the laser beam scans in a fan scan. A scanning assembly is mounted in optical alignment with the laser for reflecting the laser beam and for causing the laser beam to scan the particles in the optical integrating chamber. A focusing assembly is mounted in optical alignment with the laser for focusing the scanning laser beam onto the particles in the chamber, the focusing assembly operating in conjunction with the scanning assembly so that light from the laser beam is reflected from the particles and is repeatedly scattered onto the interior walls of the integrating chamber.
    Type: Grant
    Filed: April 10, 1992
    Date of Patent: October 26, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: William E. Wolf, Robert H. Livermore, David D. Dreyfuss, John J. Majeski, Eugene F. Palecki, Thomas W. Simpson