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Patents: 444 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
34 of 41

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Luxfer: 77 of 88

SPECIFICATION forming part of Design No. 28,010, dated December 7, 1897.
Application filed October 23, 1897. Serial No. 656,235. 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 with parts broken away and enlarged.
    A is the body of the prism-plate; B B, a series of surface areas on one side thereof formed by the lines of separation C C.
    D D are a series of prisms on one side of the plate, and E E are prisms on certain of the surface areas grouped so as to form a sort of
ring or hollow square intermediate between the center and an outer edge of the prism-plate.
    The essential features of my invention are found in a prism-plate, comprising a substantially flat extended body with a series of lines of separation on the other side to divide the surface into a series of substantially uniform surface areas, a series of prisms on the other side, and prisms on certain of the surface areas arranged in a sort of hollow square intermediate between the center and edge.
    I claim--
    A design for a prism-plate, substantially as shown and described.
FRANK L. WRIGHT.
Witnesses:
    OLIN H. BASQUIN,
    C. A. LONGFELLOW.