37 CFR § 42.220 - Patent owner response.

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§ 42.220 Patent owner response.

(a) Scope. A patent owner may file a response to the petition addressing any ground for unpatentability not already denied. A patent owner response is filed as an opposition and is subject to the page limits provided in § 42.24.

(b) Due date for response. If no date for filing a patent owner response to a petition is provided in a Board order, the default date for filing a patent owner response is three months from the date the post-grant review is instituted.