Office Action Response. Overcome Office Action Letters with the Law. If you have received an Office Action from the United States Patent and Trademark Office (USPTO) for a trademark filing, then you are not alone. In fact, it often occurs when filings are rejected based on at least one legal ground.n most arguments, case law on the books is used in a response to argue objections in the Office Action letter. Generally, without the help of an experienced trademark attorney, it is difficult to properly respond to the legal objections raised in the Office Action letter.