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Updated on Westlaw only, Annotated Patent Digest is a patent research tool that provides the information needed to determine whether to cite a case in a letter, brief, or other document. It also helps you formulate opinion letters and responses to office actions by the U.S. Patent and Trademark Office. It provides brief summaries of pertinent legal propositions and relevant language from the U.S. Supreme Court, U.S. Court of Appeals for the Federal Circuit, or other authority applying a proposition. It also includes a short summary of the facts showing how the judicial authority applied a proposition in a given case, and the ultimate outcome of that case. Annotated Patent Digest is updated every two weeks and only through Westlaw in ANPATDIG database.