Yes. After a trademark has been granted, suing is the way you defend your trademark. Also, there have been more of these...a lot more. Perhaps you remember Apple suing NYC over their NYC Green apple logo or the Victoria School of Business and Technology over their apple-shaped logo or Woolworths Limited over their logo? ...and those are just the ones conveniently listed on the list of trademark litigation from this wikipedia page: http://en.wikipedia.org/wiki/Apple_Inc._litigation#Trademark...
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Yes. After a trademark has been granted, suing is the way you defend your trademark. Also, there have been more of these...a lot more. Perhaps you remember Apple suing NYC over their NYC Green apple logo or the Victoria School of Business and Technology over their apple-shaped logo or Woolworths Limited over their logo? ...and those are just the ones conveniently listed on the list of trademark litigation from this wikipedia page: http://en.wikipedia.org/wiki/Apple_Inc._litigation#Trademark...