Trademark "Melitta" registered for coffee filters.
On September 13, 1911, Melitta registered the "Melitta" trademark at the German Patent Office, securing the brand identity of her growing business. The trademark protected her product line from competition and imitations, reinforcing her position in the market. This legal step was crucial in establishing 'Melitta' as a household name, synonymous with quality and innovation in coffee preparation.