Tong Cheng Iron Works filed a cancellation action at the Intellectual Property and International Trade (IP & IT) Court claiming a better prior right. Chumsin defended on the basis that it was in good faith. However the court found otherwise; that Chumsin had used and registered the mark in bad faith so they cancelled Chumsin's registration. Chumsin appealed.
In some sense this decision enshrines a form of common law rights based on use into Thai trademark law.