This page is an FAQ based on guidance from the Manual of Patent Examining Procedure. It is provided as guidance, with links to the ground truth sources. This is information only: it is not legal advice.
The concept of “original claims” has a unique impact on the correspondence between specification and claims. MPEP 2173.03 states:
“Original claims constitute part of the specification and provide their own written description.”
This means that original claims (those present in the application as filed) are considered part of the specification itself. As such, they inherently have support in the specification and can serve as their own written description. However, this doesn’t exempt them from the requirement of clarity and definiteness. Even original claims must be clear, concise, and supported by the rest of the specification to avoid indefiniteness rejections.