Read our latest coverage of patent law and intellectual property issues, from Silicon Valley to the U.S. Supreme Court.

“Probably of all the tech companies on the planet these are two of the most IP savvy of all,” said Ronald Laurie, an IP consultant who co-founded Inflexion Point Strategy with Siino in 2004. “Both companies view their IP positions as key assets.”

It’s hard to tell what Microsoft and Yahoo’s in-house IP lawyers think of the other’s policies � Siino did not return phone calls and a Microsoft spokesman declined to comment � but it’s clear they’ll have some talking to do if the deal goes through.