Boot company Emu Australia has launched a countersuit against Ugg brand owner Deckers Outdoor, progressing a trademark battle between the two companies.

Emu said it has filed a lawsuit against Deckers alleging its Ugg trademark "was obtained after a false statement to the US Trademark Office and is therefore invalid".

Emu Australia owner Paul Neate said in a written statement: "Decker’s have aggressively marketed their “ugg” – Australia marks and many consumers are unaware of the fact that UGG Australia is in fact American owned and based.

"There is a lot more to be told about the history of the word “ugg”, not only in Australia and Asia but also in the USA, Canada and in the UK and Europe. We believe in time the courts will come to hear the truth in different jurisdictions and will hand down decisions that make this history clearer for all concerned."

In response, a spokesperson for Decker's told just-style it is not able to comment further on the ongoing litigation.

It follows news last month that Deckers Outdoor had filed a trademark infringement in the US against Emu Australia and Emu (Aus) Pty, relating to Deckers' Ugg Australia brand.