With my (meager) understanding of trademark law, it seems like you should be ok. It's in a vastly different industry and seems like a completely unrelated product. That said, they can still send you threatening letters and potentially file a lawsuit against you, but I think you would end up winning a if you had the resources and desire to do battle. Of course, I'm no lawyer. You really should ask one, if you're genuinely worried. The costs associated would probably be far less than any potential future legal struggles.