US D184821 S
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United States Patent O Des. v184,821 Patented Apr. 7, 1959 TREAD-GRATING UNIT Ernest 'C. Liskey, Jr., Severna Park, Md.
Application November 20, 1957, Serial No. 48,556
Term of patent 14 years (Cl. D13-1) Figure 1 is a perspective view of a tread-grating unit showing my new design; and
Figure 2 is an end elevation thereof.
The sides and end of the unit not shown are like the sides and end of the unit which is shown.
The characteristic features of my ornamental design for the grating unit disclosed reside in the group of ribbed portions in spaced relation with the openings and the continuous plain bars or beams, all as shown.
Iclaim: The ornametnal design for a tread-grating unit, as shown and described.
References Cited in the file of this patent UNITED STATES PATENTS Liskey Mar. 3, 1953 Brockman Apr. 29, 1941 OTHER REFERENCES Modern Metals for April 1956, page 82, lower left illustration.