MANION, Circuit Judge.
Robert F. Dray, Sr. invented a valve which regulates the flow of molten plastic into molds. This valve prevents the molten plastic from flowing back into the injector machine, which makes for more uniform molds and less wasted plastic. The parties refer to this as the "internal piston valve," and so shall we. Dray patented his invention, and in 1991 exclusively licensed this patent to U.S. Valves, Inc. in exchange for a royalty commission on...
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