There are about 100 references listed on the patent in question. It seems unlikely that this, or anything, is closer to the patent in question than one of them.
**System and method for calibration of a flow device
WO 2006020870 A1**
Priority date Aug 13, 2004
ABSTRACT Embodiments of the present invention provide a system (200) and method for rapid calibration of a flow device (30). A flow device can be provided with a calibration flow curve (e.g., represented by an nth degree polynomial) by the manufacturer or a third party. The calibration curve can be adjusted for a process fluid and the system for which the flow device is actually installed using one or more correction factors. The correction factors can be determined for the flow curve based on a simple empirical test or fluid properties of the process fluid. The corrected flow curve is then saved at the flow device so that it can be used for future flow control.