Electronic Trademark Examination Application System - electronic trademark filing system. It allows the public to complete various trademark filings and transactions on-line. For example, eTEAS allows you to complete trademark applications, preliminary amendments, amendments to allege use/statements of use, responses to Office actions, and post registration filings online, and then submit them directly over the Internet, paying by credit card, electronic funds transfer or an existing USPTO deposit account.

Source: U.S. Patent and Trademark Office.