According to [urlhttp://www.mmo-champion.com/threads/1319693-Blizzard-files-new-trademark-for-Hearthstone?p=21735317#post21735317] this [/url] the US Hearthstone trademark was filed 7/713 - although a bit more digging on google shows they apparently trademarked it in [urlhttp://www.hearthpwn.com/news/62-hearthstone-trademark-san-diego-comic-con-reminder]Swaziland in February this year[/url] …
I don’t exactly have knowledge on the US legal system, but a quick google can throw up some extremely basic understandings … it would probably a lot of hassle for Blizzard to pursue something like this, when it would be rather hard to get the two games confused … one is a trading card game the other a city management game … I mean, is someone likely to be confused between the two beyond the name?
Also I’m not sure if Radiant have trademarked Stonehearth … I’m also not sure if you having a working title of it still holds the same weight …
I’m pretty sure this same thing arose on their old forums, in fact I think they were worried about this exact same thing and [urlhttps://twitter.com/radentupdates/statuses/315173787698098176]were looking to change from Stonehearth[/url].
I’m not sure what the consensus was, we can assume that they didn’t change and also from the main website we can see Stonehearth has been used since at [urlhttp://stonehearth.net/2012/11/08/welcome/]least November[/url].
I think that might be a completely different example. World of Warcraft is already extremely well established, and using such a name like Warcraft of World is blatantly trying to confuse someone or piggybacking on that established title for promotion perhaps?
Hearthstone was announced in March I think? A fair few months after Stonehearth was in development and it would be unreasonable to say that Radiant knew about Hearthstone. Plus I would imagine Blizzard or some people within Blizzard have been made aware of Stonehearth, and we haven’t heard anything, so, let’s all just carry on!
Edit: Also from the AMA they did:
“I’m super excited for Stonehearth, and have been following the kickstarter closely. But I’m worried about one thing: Blizzard has a card game in beta called Hearthstone.
Are you afraid they’re going to make you change the name of your game?”
“We’ve had the name Stonehearth since last November, and we really like it.
We can’t control what Blizzard does, but we will try to keep the name Stonehearth”