When can an examiner require restriction to a single species?

An examiner can require restriction to a single species when multiple species are claimed and they are mutually exclusive. The MPEP 806.04(f) states:

“Where two or more species are claimed, a requirement for restriction to a single species may be proper if the species are mutually exclusive.”

This means that if the claimed species have distinct, non-overlapping characteristics, the examiner may issue a restriction requirement to limit the examination to a single species.

To learn more:

• restriction requirement
• species claims
• patent examination
• MPEP 806.04(f)