When conducting searches using the United States Patent Classification (USPC) system, it’s crucial to consider the Search Notes of parent subclasses. The MPEP 902.02(a) provides important guidance on this matter: “Since a search note that applies to a particular subclass is rarely repeated for subclasses indented thereunder, it is advisable to review the search notes…

Reviewing Search Notes of parent subclasses in the United States Patent Classification (USPC) system is crucial for conducting comprehensive prior art searches. The MPEP 902.02(a) emphasizes this importance: “Since a search note that applies to a particular subclass is rarely repeated for subclasses indented thereunder, it is advisable to review the search notes of all…