Does anyone know how to connect ISIC code and IPC code?

ISIC code is the most widely use commercial product code. If I want trace this commercial product from which kinds of patents, IPC code seems the good way to trace it, however, our research team just find ISIC ver 2 to connect IPC, and ISIC ver2 seems lack of lots of commercial product information.

Does anyone know how to use newest ISIC to connect to the IPC code?