The Journal News is reporting a story from Bloomberg News that Verizon is suing Nextel over Nextel’s recently issued registration for PUSH TO TALK (no online versions of the story available as of Sunday morning).  Verizon had sued Nextel in June alleging theft of trade secrets, which suit Nextel has moved to dismiss.  Nextel’s registration is on the supplemental register which makes it something of a place-holder, in that it blocks later-filed applications but doesn’t have the offensive capabilties of  a registration on the principal register.  Here’s an example of descriptive use of the term by the media.