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D28,004 · Wright · "Design for a Prism-Plate" · Page 1
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D28,004: 1 of 2

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Patents: 438 of 511
UNITED STATES PATENT OFFICE
FRANK L. WRIGHT, OF CHICAGO, ILLINOIS, ASSIGNOR TO
THE LUXFER PRISM PATENTS COMPANY, OF SAME PLACE.

DESIGN FOR A PRISM-PLATE.
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Frank L. Wright
28 of 41

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Luxfer: 71 of 88

SPECIFICATION forming part of Design No. 28,004, dated December 7, 1897.
Application filed October 23, 1897. Serial No. 656,228. Term of patent 14 years.
To all whom it may concern:
    Be it known that I, FRANK L. WRIGHT, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and original Design for Prism-Plates, of which the following is a specification.
    My invention relates to designs for prism-plates.
    Figure 1 is a plan view of a prism-plate embodying my design. Fig. 2 is a cross-section therethrough on line 2 2.
    A A are surface areas comparatively uniform and formed by the lines of separation B B on the surface of the prism-plate. C C are prisms on the opposite side.
    D D are lines which constitute designs along a band of lower areas; E E, lines which
form designs along an upper band of areas. The areas F F are shown as plain.
    The essential features of my design are found in a prism-plate comprising an extended body with prisms on one side and lines of separation on the other, and an ornamented band of surfaces across the upper part and an ornamented band of surfaces across the lower part.
    I claim--
    A design for a prism-plate, substantially as shown and described.
FRANK L. WRIGHT.
    Witnesses:
        OLIN H. BASQUIN,
        FRANCIS W. PARKER.