Company's US patents are now being challenged. Report: Claire Robinson

The European Patent Office (EPO) has revoked an EU patent held by Impossible Foods, maker of the Impossible Burger. In the US, Impossible's fake meat products are manufactured with GMO yeast-derived soy leghemoglobin, a controversial ingredient that makes the fake meat look as if it's bleeding, like undercooked real meat, and that we have argued may not be safe to eat.

Following the EPO's decision, another fake meat company, Motif FoodWorks, has filed a suite of new petitions with the US Patent and Trademark Office challenging US patents held by Impossible Foods over the use of heme proteins (such as that present in soy leghemoglobin) in meat alternatives, as it defends itself against Impossible's accusations of patent infringement, according to Food Navigator USA.