A trademark for the term WEBinar (first three letters capitalized) was registered in 1998 by Eric R. Korb (Serial Number 75478683, USPTO) and was reassigned to InterCall. The trademark registration was cancelled in 2007. Learn.com filed a claim for the term "webinar" without regard to font or style in 2006 (Serial Number 78952304, USPTO). That trademark claim was abandoned in 2007 and no subsequent filing has been made.
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You can do this through statistics or survey results from your existing customers. Imagine the conversion capability of a statement like, “Seventy percent of customers using our product shaved 10 points off their golf game within a month!” You can just hear them clicking your CTA. Just be sure not to make any outrageous claims—especially income claims. You want to preserve their sense of trust in you.