Actually, IBM labs ran the gamut as far as patents, Bell Labs as well... But there they seemed to stop, didn't have the ability or will, to bring those patents to the marketplace...
Bell turned their's over to Western Electric, folded many into various iterations of all sorts of end products in the telecom world, also failed, like IBM, to hit the consumer markets, other than tele handsets..
Today we've no idea what has become of the Bell patent libraries, after the transistor giveaway, maybe they should have just opened the whole library to the public, sold it off, something... Hate to think it's lost...