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"But Bayer's brand among Americans took a hit, and the British government had already stripped Bayer of its trademark over "aspirin." When the Americans allied to Britain and the Triple Entente, this became important, as the United States seized all of Bayer's property within the U.S., including their trademarks (at least when used domestically). In many cases, similar seizures would be reversed when the war ended, but Bayer became a special case. The Treaty of Versailles ended the war as it related to Germany, with the Germans agreeing to pay billions of dollars (in today's terms) in reparations. Because cash payments would lead to hyperinflation of German currency, thereby devaluing the reparations received, the parties got creative. Germany agreed, as part of their reparations, to fork over coal, steel, and other resources. And more relevant to this story, Germany agreed to release claims over certain intellectual property — such as the trademark over the term "aspirin."
Since then, aspirin has become a generic term in most of the world."