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Patents: 443 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
33 of 41

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Luxfer: 76 of 88

SPECIFICATION forming part of Design No. 28,009, dated December 7, 1897.
Application filed October 23, 1897. Serial No. 656,234. 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 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 on line 2 2.
    A is the body of the prism-plate; B B, a series of surface areas substantially uniform produced by the lines of separation C C.
    D D are prisms on one side of the prism-plate, and E E prisms on the other side of the prism-plate and produced upon a series of the
surface areas about or near the edge of the prism-plate, so as to form a sort of border.
    The essential features of my design are found in a prism-plate comprising a substantially flat extended body with prisms on one side, lines of separation on the other side, which divide the surfaces into a series of substantially uniform surface areas, and prisms on such surface areas about or near the edge, so as to form a sort of border.
    I claim--
    A design for a prism-plate, substantially as shown and described.
FRANK L. WRIGHT.
Witnesses:
    OLIN H. BASQUIN,
    C. A. LONGFELLOW.