From the background information supplied by the inventors, news correspondents obtained the following quote: “FIG. 1 is a side view 100 of the prior art barbed plate 101. Barbs 102, 103 and 104 are shown protruding from plate 101. Barbs 102, 103 and 104 are formed by punching the plate with a die and then bending the barbs 102, 103 and 104 to protrude at an angle of approximately 90.degree. with respect to the plate. FIG. 1A is a front side view 100A of the prior art barbed plate 101.
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via Patent Issued for Fastener (USPTO 9212676) | Equities.com.