USD28000S - Design for a prism-plate - Google Patents

Description

II II!!! NW! H W DESIGN.

P. L. WRIGHT.

PRISM PLATE.

Patented Dec. 7, 1897.

UNITED STATES PATENT OFFICE.

FRANK L. \VRIGI-IT, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE LUXFER PRISM PATENTS COMPANY, OF SAME PLACE.

DESIGN FOR A PRISM-PLATE.

SPECIFICATION forming part of Design No. 28,000, dated December '7, 1897.

Application filed October 21, 1897. Serial No. 655,978. 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 Chicage, in the county of Cook and State of Illinois,h ave invented a certain new and original Design for Prism-Plates, of which the following is a description.

My invention relates to designs for prismplates.

Figure 1 is a plan view of a prism-plate embodyinginy design. Fig. 2 is a section therethrough.

A is the body of a prism-plate; B B, a series of lines of separation on one side thereof, whereby the surface on such side is divided into a series of surface areas C C of substantially uniform size;

D D are prisms of a certain angle, as indicated, and forming the field of the prismplate.

E E are a series of prisms of a different angle and arranged so as to form an outer border. \Vhen considered from the prism side, the inner field and the outer border will differ in appearance, so as to be distinguishable one from the other.

The essential features of my invention are found in a prism-plate comprising a substantially flat extended body with prisms on one side, the prisms having different angles, those of one an gle forming an outer border and those of another angle forming an inner field.

A design for a prism-plate, substantially as shown and described.

FRANK L. \VRIGIIT.

\Vitnesses:

O. A. LoNeFnLLmv, OLIN 1L BASQUIN.

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