How do reference characters in patent claims affect their scope?
Reference characters in patent claims generally do not affect the scope of the claims. The MPEP 2173.05(s) states: “Reference characters corresponding to elements recited in the detailed description and the drawings may be used in conjunction with the recitation of the same element or group of elements in the claims. Generally, the presence or absence of such reference characters does not affect the scope of a claim.“
This means that while reference characters can be used to clarify which elements in the detailed description and drawings correspond to elements mentioned in the claims, they don’t change the meaning or breadth of the claim. They serve as a helpful cross-reference tool but don’t limit or expand the claim’s coverage.
To learn more: