USPTO Trademark API — Implementing trademark availability and search — part 2 Trademarks are a valuable business asset that can help distinguish your brand and products from those of your competitors. As such, it’s important to choose a trademark that is not only unique and memorable but also available for use. One way to determine the availability of a trademark is by using the United States Patent and Trademark Office (USPTO) Trademark API, which provides access to the USPTO’s database of registered trademarks.