Verizon extensively uses its new colors and logo, but has the Bell logo on the side of pay phone mounting. On its bill advertising inserts, it has "Bell Telephone Company of Pennsylvania" in fine print at the bottom." Even Bell in its last days abbreaviated that to "Bell of Pennsylvania"
In the railroad world, hobbyists use logos on model trains and in books. Most railroad companies make a tiny effort to preserve legacy logo rights even though they don't use them in practice anymore. They don't charge model makers, souvenir makers, or publishers royalty fees for use.
However, the successor owner of the Pennsylvania Railroad (PRR keystone logo) apparently let it lapse and a private entity snatched it up. This entity then began to demand royalties from all model makers and publishers. Since the Pennsy was a big well known railroad, there are a great many books and models about it all using the logo. Somehow the successor owner was able to get the rights back.
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