Are functional limitations allowed in patent claims?
Yes, functional limitations are generally allowed in patent claims. The MPEP states, “There is nothing inherently wrong with defining some part of an invention in functional terms. Functional language does not, in and of itself, render a claim improper.”
In fact, functional language can be used to limit claims without using the means-plus-function format. However, it’s important to note that functional limitations must still meet the requirements of clarity and definiteness under 35 U.S.C. 112(b).
To learn more:
Topics:
MPEP 2100 - Patentability,
MPEP 2173.05(G) - Functional Limitations,
Patent Law,
Patent Procedure