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A '''terminal disclaimer''' in [[patent]] law is explained by section 1490 of the Manual of Patent Examining Procedure:

{{cquote|A disclaimer is a statement filed by an owner ... of a patent or of a patent to be granted, in which said owner relinquishes certain legal rights to the patent. ... [A] terminal disclaimer under 37 CFR 1.321(a) and (b) [is] used to disclaim or dedicate a portion or the entire term of all of the claims of a patent.}}

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The purpose of a terminal disclaimer is to extend the lifetime of a patent:

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{{cquote|First, we note that an [obviousness-type double patenting] ODP determination depends on an assessment of obviousness, i.e., whether the claims of a later-expiring patent would have been obvious over the claims of an earlier-expiring patent owned by the same party. If so, absent a terminal disclaimer, the later-expiring claims are invalid. Application of that determination requires determining which is the later-expiring patent, which is why the date when PTA or PTE is applied matters.}}

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''In re Cellect, LLC'', 81 F.4th 1216, 1226 (Fed. Cir. 2023).

As explained further the [[Federal Circuit]]:

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