Sure, go right ahead. However, you may want to run a trademark search with the USPTO to make sure some company hasn't already trademarked it for the reminders

Sure, go right ahead. However, you may want to run a trademark search with the USPTO to make sure some company hasn't already trademarked it for the reminders market. Trademarks are context-specific, so if it hasn't been trademarked for this context, I would file for one.