https://www.google.com/?tbm=pts&gws_rd=ssl#q=inassignee:%22T...
Edit: Nice catch, peter_l_downs ... I didn't realize that the estimated search result of 6,430 would be off by such a large factor.
How many times in the past has a private company opened up its core patents for everyone to use? There aren't that many precedences.
It's helpful to keep in mind that AT&T operated under anti-trust watch from 1917 through 1984, with the 1950s action being among the most significant.
It was also responsible for keeping AT&T out of the computing market, which meant that when AT&T created an operating system, it had something it couldn't sell, so it gave it away.
You may have heard of this, it was called "UNIX".