I have just seen in an electronics weekly paper that Philips have filed =
a case in American courts against 6 companies for I2C patent =
infringements. I cannot remember all the company names but Analog =
Devices and Cypress were mentioned. Microchip was not mentioned. It was =
not clear from the article exactly what was infringed, but it did =
mention that there something like 38 licensees of the patent.

The numbers and names above are being quoted from memory after wandering =
back from the company library, so all disclaimers qualify for the =
accuracy of these.

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