Patents by Inventor Harold A. Fitzgerald, II

Harold A. Fitzgerald, II 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).

  • Light reflectivity and transmission testing apparatus and method
    Patent number: 4120582
    Abstract: Apparatus and method for testing an optical element sample such as a mirror simultaneously and substantially instantaneously both for the total amount of light reflected from and the total amount of light transmitted by a predetermined area of that sample. The apparatus includes a pair of axially aligned light-integrating spheres between which is clamped the test sample so that no light enters or escapes from either sphere. A preferably optically regulated, substantially collimated beam of light is directed through one sphere against the test sample at an angle to the sphere axis. Silicon photo-voltaic light sensitive detectors connected to amplified readout units indicate the total light reflectivity in one sphere and the total light transmission to the other sphere.
    Type: Grant
    Filed: October 27, 1976
    Date of Patent: October 17, 1978
    Assignee: Donnelly Mirrors, Inc.
    Inventors: Martin De Vries, Harold A. Fitzgerald, II, Eldon J. Nyhof, James D. VAN Putten, Jr.