The US Patent and Trademark Office declared in late October 2019 that the petition of IML for cancellation of the trademark RESISTOGRAPH® in the USA “is denied with prejudice”. This means that RESISTOGRAPH® continues to be an exclusive trademark belonging to RINNTECH® as the inventor of the term (“RESISTOGRAPH”) and as the developer of high resolution resistance drilling. Frank Rinn has been developing these high quality machines in Germany since 1986 and his RESISTOGRAPH® trademark is registered in 40 countries. Only machines made by Rinntech are Resistographs. Only data collected with a machine made by Rinntech provide Resistograph® data.
