Bayer Aspirin, 1916:
As the patent for acetylsalicylic acid was about to expire, Bayer began to emphasize the company name and the trademarked name Aspirin.
Bayer Asperin, 1930s:
During World War I, the US seized German patents and trademarks. Sterling Drug bought Bayer's American rights and continued to emphasize the Bayer company logo.