Yelp, Groupon Hit In Latest Round Of Marketer's IP Blitz

By Kira Lerner (May 28, 2013, 4:02 PM EDT) -- Digital marketing company Blue Calypso Inc. filed another round of infringement lawsuits in Texas federal court Monday, accusing Yelp Inc., Groupon Inc., Foursquare Labs Inc. and others of infringing its patent covering electronic offers. ...

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