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D28,007 · Wright · "Design for a Prism-Plate" · Page 1
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Patents: 441 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
31 of 41

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Luxfer: 74 of 88

SPECIFICATION forming part of Design No. 28,007, dated December 7, 1897.
Application filed October 22, 1897. Serial No. 656,100. 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 useful Design for Prism-Plates, of which the following is a description.
    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.
    A is the body of the prism-plate. C C are lines of separation across the face thereof, whereby it is divided into a series of substantially uniform surface areas. B B indicate such areas. D D are prisms on the other side of the plate.
    E E are dots, projections, or parts of lines formed on the surface of the prism-plate so as to produce ornaments thereon.
They are arranged so as to produce the effect of broken, fragmentary, or interrupted lines.
    The essential features of my invention are found in a prism-plate comprising a substantially flat and extended body with a series of prisms on one side and on the other side lines of separation which divide such surface into a series of substantially uniform surface areas and ornaments or patterns produced on such surface by broken, interrupted, or fragmentary lines or forms, as shown.
    I claim--
    A design for a prism-plate, substantially as shown and described.
FRANK L. WRIGHT.
    Witnesses:
        FRANCIS W. PARKER,
        C. A. LONGFELLOW.