Patents by Inventor Louise Leone Spurles

Louise Leone Spurles 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).

  • Variable magnification lens system
    Patent number: 4061419
    Abstract: A variable magnification lens is exemplified by a 6-element symmetrical zoom lens for use between fixed conjugates at magnification ranging from 1.007X to 0.615X. The outer elements remain fixed relative to the unit. The inner elements form two integral pairs on each side of the central aperture and move symmetrically with respect to it to effect magnification change while maintaining a substantially flat image field over the entire magnification range.
    Type: Grant
    Filed: March 3, 1976
    Date of Patent: December 6, 1977
    Assignee: Xerox Corporation
    Inventors: Edgar Elmer Price, Louise Leone Spurles