StacksVerified U.S. regulatory reference

37 CFR §42.120

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Scope. A patent owner may file a single response to the petition and/or decision on institution. A patent owner response is filed as an opposition and is subject to the page limits provided in § 42.24.
  2. (b)Due date for response. If no time 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 inter partes review was instituted.