Patents by Inventor Richard A. Hopkins, Jr.

Richard A. Hopkins, Jr. 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).

  • Laser optical density measurement system
    Patent number: 6130753
    Abstract: An apparatus for measuring optical density of highly absorptive materials in which a beam splitter divides light from a laser source into a reference beam, which is directed to a reference detector, and a sample beam, which is reflected off a diffusing plate, through a light limiting aperture, and to a sample. The emanations from the sample are directed to a sample detector. An instrumentation amplifier compares the intensities of the two detectors. The aperture and reference detector are positioned so that the measured intensities are equal, and the optical density of the sample is calculated.
    Type: Grant
    Filed: February 1, 1999
    Date of Patent: October 10, 2000
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Richard A. Hopkins, Jr., Benjamin A. Rockwell