The designation "Ostfriesentee" is not protected, so that many teahouses outside of East Frisia also offer [[black tea]] [[Blend|blends]] under this name or as an "East Frisian blend". Only word marks such as "Bünting tea genuine Ostfriesentee" are registered as registered trademarks at the German Patent and Trademark Office. | The designation "Ostfriesentee" is not protected, so that many teahouses outside of East Frisia also offer [[black tea]] [[Blend|blends]] under this name or as an "East Frisian blend". Only word marks such as "Bünting tea genuine Ostfriesentee" are registered as registered trademarks at the German Patent and Trademark Office. |