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What is a continuation patent application?

Updated Oct 23, 2026

Short answer

A continuation is a new US patent application that reuses a pending parent’s specification and presents new claims. Claims the parent supports keep the parent’s filing date. It must be filed on or before the day the parent issues or before it is abandoned.

Sources: 35 U.S.C. 120, MPEP 201.07, MPEP 211.01(b).

How a continuation works

The MPEP defines it as “an application for the invention(s) disclosed in a prior-filed copending nonprovisional application”, and adds that it “must not include any subject matter which would constitute new matter” (MPEP 201.07).

  • Same specification. The disclosure must match the parent’s. Nothing may be added that would be new matter in the parent.
  • New claims. The claims can be broader, narrower or simply different from the parent’s.
  • The parent’s date. Under 35 U.S.C. 120, a claim supported by the parent is treated as filed on the parent’s date. The continuation must contain a specific reference to the parent.

The parent must be a nonprovisional, PCT or Hague application. A provisional cannot be the parent of a continuation (MPEP 211.01(b)).

Why applicants file continuations

  • To pursue different or broader claims. The parent can issue with the claims the examiner allowed, while the continuation keeps working on the rest.
  • To keep the family pending. While one application is pending, the family can still take new claims from the same specification.
  • To cover competitor products. The Federal Circuit has said it is not “in any manner improper to amend or insert claims intended to cover a competitor’s product the applicant’s attorney has learned about during the prosecution of a patent application” (Kingsdown v. Hollister, Fed. Cir. 1988).

The limit is the specification as filed. New claims still need written-description support in the original filing (PIN/NIP, Inc. v. Platte Chemical Co., 304 F.3d 1235 (Fed. Cir. 2002)). A pending specification may support claims covering a product launched years later, but only if the disclosure describes it. See continuation strategy for competitor products.

The deadline

A continuation must be filed “before the patenting or abandonment of or termination of proceedings on” the parent (35 U.S.C. 120). Filing on the issue date itself is timely (MPEP 211.01(b)). Patents issue on Tuesdays.

Paying the issue fee does not close the window, the issue date does. But patents issue shortly after payment, so the MPEP calls filing before you pay the issue fee “best practice.” If no family member is pending, no continuation can be filed. Details: the continuation deadline.

Is any member of the family still pending?

The free continuation window checker reads public USPTO records and shows which family members are still pending, the earliest benefit date and the surcharge dates.

US numbers only. Slashes, commas and spaces are fine.

USPTO fees, at a high level

A continuation pays the normal filing, search and examination fees. Since Jan 19, 2025 it may also owe the continuing application fee (37 CFR 1.17(w)):

  • Filed more than 6 years after the earliest benefit date: $2,700 large, $1,080 small, $540 micro.
  • More than 9 years: $4,000 large, $1,600 small, $800 micro.

The earliest benefit date is the earliest US nonprovisional, PCT or Hague filing date claimed. Provisional and foreign priority dates do not count (CAF Guide). See the continuation surcharge, or get your dates from the surcharge calculator.

To get claims issued faster, a continuation can request Track One prioritized examination, but only at filing (37 CFR 1.102(e)). See Track One for continuations.

Continuation, CIP or divisional?

All three claim the benefit of a pending parent. A continuation keeps the same disclosure. A continuation-in-part adds new matter, and claims relying on it get only the CIP’s own date. A divisional pursues claims the examiner split off in a restriction requirement. All three owe the continuing application fee on the same schedule. See continuation vs CIP vs divisional.

Informational only, not legal advice. Have a registered patent practitioner review before filing.

Questions about continuation applications

What is a continuation patent application?

It is a new US application that uses the same specification as an earlier, still-pending nonprovisional application (the parent) and presents new claims. Claims the parent supports get the parent’s filing date under 35 U.S.C. 120. It cannot add new matter (MPEP 201.07).

When is the deadline to file a continuation?

The continuation must be filed before the parent is patented or abandoned. Filing on the parent’s issue date still counts (MPEP 211.01(b)). Paying the issue fee does not close the window, but patents issue shortly after it is paid, so the MPEP calls filing before payment best practice.

Does a continuation extend the patent term?

No. The 20-year term runs from the earliest benefit date, the earliest US nonprovisional, PCT or Hague filing date the continuation claims, before any patent term adjustment or extension. A continuation filed years later expires on the same base date as its parent.

Can a continuation claim a competitor’s product?

Yes, if the specification supports the claims. The Federal Circuit has said it is not “in any manner improper” to amend or add claims to cover a competitor’s product learned of during prosecution (Kingsdown v. Hollister, 1988). The new claims still need written-description support in the original filing (PIN/NIP v. Platte, 2002).

How many continuations can you file?

The statute sets no number, as long as each one is filed while a parent in the chain is pending and each link carries the benefit claim. Each continuation filed more than 6 years after the earliest benefit date owes the continuing application fee, and very long delays can raise prosecution laches.

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