Nextel Claims Trademarks On "Push To Talk" and "PTT"

dmurawsky writes "According to an article at Forbes, Nextel announced that it had been awarded a primary trademark for the term 'PTT' and a Secondary trademark for 'Push To Talk.' Now maybe it's just me, but this term has been used in the radio world for around 60 years. I would have thought it was in the public domain by now. I wonder how Motorola or other radio manufacturers are going to take this. Here's a discussion of the topic at QRZ, an amateur radio forum." Update: 06/24 01:03 GMT by T : Thanks to reader Dan Horn for pointing out the flubbed original headline: Yes, this is about trademarks, rather than patents.