Burden of Proof During Prosecution
During patent prosecution, the disclosed utility is presumed valid. The patent office bears the burden to disprove utility. The standard the USPTO uses is whether there is a reasonable doubt that it would lack utility from the perspective of a person having ordinary skill in the art. If the examiner shows evidence that the invention is not useful, the burden shifts to the applicant to prove utility. The applicant can then submit additional data to support a finding of utility. The invention must possess utility at the time of application.
Read more about this topic: Utility (patent)
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