What is the difference between breadth and indefiniteness in patent claims?

Breadth and indefiniteness are distinct concepts in patent claims. As stated in MPEP 2173.04, “Breadth of a claim is not to be equated with indefiniteness.” The section further explains:

“A broad claim is not indefinite merely because it encompasses a wide scope of subject matter provided the scope is clearly defined. But a claim is indefinite when the boundaries of the protected subject matter are not clearly delineated and the scope is unclear.“

In other words, a claim can be broad but still definite if its boundaries are clear. Indefiniteness occurs when the scope of the claim is unclear, regardless of its breadth.

To learn more:

• patent claims
• claim breadth
• indefiniteness
• claim scope
• patent examination