The name later became a genericized trademark after the term "thermos" became the household name for such a vacuum-insulated container for liquids. The vacuum flask went on to be used for many different types of scientific experiments and the commercial "Thermos" was transformed into a common item. "Thermos" remains a registered trademark in some countries, but it was declared a genericized trademark by court action in the United States in 1963, since it had become colloquially synonymous with vacuum flasks in general. However, there are other vacuum flasks.