What is the burden of proof for inherency in patent rejections?
The burden of proof for inherency in patent rejections initially lies with the examiner. The MPEP states: “In relying upon the theory of inherency, the examiner must provide a basis in fact and/or technical reasoning to reasonably support the determination that the allegedly inherent characteristic necessarily flows from the teachings of the applied prior art.”
(MPEP 2112)
However, once the examiner establishes a prima facie case of inherency, the burden shifts to the applicant. As stated in the MPEP: “[T]he PTO can require an applicant to prove that the prior art products do not necessarily or inherently possess the characteristics of his [or her] claimed product.”
The applicant may rebut this by providing objective evidence that the prior art does not necessarily possess the claimed characteristics. The standard of proof is similar to that required for product-by-process claims, as discussed in MPEP 2113.
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