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:
[–]monkeyhole22
“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?”
[–]inkblotSRK[S]
“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”