What are residual classification places in CPC and when are they used?

Residual classification places in CPC are used when no specific classification place explicitly covers the technical features of the invention. Key points about residual classification places:

• They exist at both subclass and group levels.
• Identifiable by titles indicating they cover subject matter not elsewhere covered.
• Used as a last resort when no explicit classification place can be found.

According to MPEP 905.03(b): “In the event a classification place that explicitly covers the technical features of the invention to be classified cannot be identified, then classification should be made to a “residual” classification place. Residual classification places can be found at both subclass and group levels. Residual classification places are identifiable by their titles, which typically indicate they cover subject matter not elsewhere covered.“

Residual classification places ensure that all inventions can be classified, even if they don’t fit neatly into existing categories.

To learn more:

• CPC classification
• residual classification
• patent classification
• unclassified inventions