When Sony's The Last Guardian trademark ran out earlier this week it seemed as though the game was further from release than ever before, but it turns out it was all down to a simple mistake.

Sony failed to file the correct paperwork to renew the trademark, according to a petition submitted by Sony which intended to get the trademark renewed despite their error (via DualShockers).

The good news is that the United States Patent and Trademark Office (USPTO) has granted Sony's request, meaning the trademark is once again "live".

The Last Guardian

This, coupled with Sony Computer Entertainment Europe's confirmation to VideoGamer that the game is still in development, should give fans renewed hope.

Sony's petition read: "Applicant has first hand knowledge that the failure to file an SOU or Extension Request by the specific deadline was unintentional, and requests the USPTO to revive the abandoned application."

Announced way back in 2009, The Last Guardian is Team Ico's follow-up to Ico and its spiritual successor Shadow of the Colossus. Due to the stature of those two classics, The Last Guardian is a highly-anticipated release – but its development has been troubled and no footage has been seen since 2010.

What we had seen of the game depicted a boy and a huge griffon/puppy animal that he has befriended, and who aids him in traversing a large and mysterious world. It seemed to be a blend of elements from the prior two games.

Despite being notable in its absence, Sony has repeatedly stated that the game is still in development and will be released eventually.

Whenever that is, we hope it's before Sony have the chance to screw up renewing the trademark for a third time.