How to File a Continuation Application

A continuation application lets you pursue additional claims based on the same specification as a previously filed application — maintaining the original priority date. This is one of the most powerful tools in US patent strategy, allowing you to obtain multiple patents from a single disclosure.

When to File a Continuation

Before the parent application grants. A continuation must be filed while the parent application is still pending. Once the parent issues as a patent, the window closes (unless you file a continuation before the issue date).

When you want broader or different claims. The examiner allowed certain claims but you want to pursue additional claims covering different aspects of the invention.

When a competitor's product has changed. The competitor redesigned to avoid your granted claims — a continuation with new claims targeting their current design maintains pressure.

As part of a portfolio strategy. Multiple patents from one specification create a thicket of overlapping rights that is harder for competitors to design around than a single patent.

How to File

1. Prepare the continuation application with new claims (the specification is identical to the parent)
2. File through Patent Center as a "Continuation" application type
3. Reference the parent application number
4. Pay the filing fee (same as a new non-provisional — $728 small entity basic filing as of January 2025; note that continuations filed more than 6 years after the earliest benefit date incur an additional surcharge)
5. The continuation receives a new application number but retains the parent's priority date

Types of Continuing Applications

Continuation: Same specification, new claims. Most common.

Continuation-in-Part (CIP): Adds new matter to the specification. New matter gets the CIP filing date; original matter retains the parent priority date.

Divisional: Filed when the examiner determines the parent application contains multiple distinct inventions (restriction requirement). Each invention is pursued in a separate divisional application.

Sources

1. USPTO — Continuation Applications — Official guidance on filing continuation, CIP, and divisional applications
2. MPEP § 201.07-201.08 — Continuation and CIP Applications — Detailed examination procedures for continuation applications
3. 35 U.S.C. § 120 — Benefit of Earlier Filing Date — Statutory basis for claiming priority through continuation applications