Bayer Corporation (also known as Bayer USA) is the American subsidiary of Bayer AG. Its main offices are located in Whippany, New Jersey. In addition it has 40 fully consolidated subsidiary companies located in 19 different states.
Bayer AG began marketing in the United States soon after the company's inception in Germany. In the late 1800s, they began to sell their trademark medication, aspirin. While the name "aspirin" became synonymous with Bayer for over a quarter of a century, the company lost the trademark on the name in the United States during World War I, due to the company's German origin. The word is still trademarked in other countries.