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Patents: 429 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
19 of 41

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Luxfer: 62 of 88

SPECIFICATION forming part of Design No. 27,995, dated December 7, 1897.
Application filed October 21, 1897. Serial No. 655,972. 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 plate; B B, a series of surface areas thereon formed by the lines of separation C C. The surface areas are substantially uniform. D D are lines produced upon such surface areas, so as to form upon each area a separate independent complete pattern, and thus produce a sort of mosaic field, so to speak. In the middle of this field, on a considerable number of these surface
areas, a separate and distinct pattern is developed by the lines E E.
    The essential features of my design 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 a series of lines of separation which divide such surface into a series of substantially uniform surface areas, the field being formed by substantially uniform designs on each field-surface area and the center surface areas having formed upon them a distinct and separate pattern.
    I claim--
    A design for a prism-plate, substantially as shown and described.
FRANK L. WRIGHT.
Witnesses:
    C. A. LONGFELLOW,
    FRANCIS W. PARKER.