This is a decision on an appeal before the United States Court of Appeals for the Federal Circuit in the case of Ingenico Inc. v. IOENGINE, LLC. The core issue is IOENGINE's appeal of a jury verdict and subsequent court decisions which found certain patent claims invalid due to prior art, specifically a device known as the DiskOnKey System, including its Firmware Upgrader. IOENGINE argues that the evidence was insufficient to establish the DiskOnKey System as prior art under "public use" or "on sale" laws and that the district court made errors in jury instructions and allowing certain evidence despite IPR estoppel. The court affirms the prior ruling, finding substantial evidence supports the jury's finding of public use and concluding that IPR estoppel does not prevent the use of this type of prior art in a district court setting.

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