KNOCH, Senior Circuit Judge.
The plaintiff-appellant, T. P. Laboratories, Inc., brought its action in the United States District Court for the Northern District of Illinois, Eastern Division, alleging infringement by the defendant-appellee, Ormco Corporation, of plaintiff's U. S. Letters Patent 3,085,336 Orthodontic Appliance, an orthodontic lock pin for use with an orthodontic bracket to secure an arch wire to a tooth band in the process of straightening teeth.<...
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