What is the Patent Prosecution Highway (PPH)?

The Patent Prosecution Highway — commonly known as the PPH — is one of the most underutilized tools available to inventors seeking patent protection in multiple countries. When it applies, it can significantly accelerate foreign patent prosecution and reduce costs. Here’s how it works and when it makes sense to use it.

What the PPH Is

The Patent Prosecution Highway is a work-sharing program between participating patent offices around the world. The core idea is straightforward: if one patent office has already done the work of examining an application and determined that certain claims are patentable, other patent offices can rely on that work rather than starting from scratch. This reduces duplicated effort, speeds up examination, and lowers costs for applicants.

The PPH is not a single bilateral agreement — it’s a network of agreements between participating offices. The USPTO participates in PPH programs with patent offices in Japan, South Korea, Canada, Europe, China, and many other countries. The specific terms and eligibility requirements vary by office, but the underlying concept is the same.

How the PPH Works in Practice

To use the PPH, you need a “work product” from one patent office showing that at least one claim has been found allowable. The most common scenarios are:

• U.S. patent issued or allowed: If the USPTO has allowed claims in your U.S. application, you can use that allowance as the basis for a PPH request in a foreign office. The foreign office will typically move your application to the front of their examination queue and give significant weight to the USPTO’s findings.
• PCT application with positive written opinion: If your PCT application received a positive written opinion or international preliminary examination report indicating that the claims are patentable, that opinion can serve as the basis for PPH requests in many participating offices when you enter the national phase.
• Foreign office allowed claims: The PPH is not limited to U.S.-first filings. If a foreign office allows your claims first, you may be able to use that allowance as the basis for a PPH request at the USPTO or other offices.

The Benefits of Using the PPH

• Faster examination: PPH applications are typically advanced out of turn and examined much faster than standard applications. In some offices, examination can begin within weeks rather than the months or years a standard application might wait in the queue.
• Higher allowance rates: Because the examining office is relying in part on work already done by a trusted partner office, PPH applications tend to have higher allowance rates and fewer office actions.
• Lower prosecution costs: Fewer office actions mean fewer responses to prepare — which translates directly to lower attorney fees and government fees over the life of the application.
• Strategic leverage: A PPH request signals to the examining office that another major patent office has already vetted the claims, which can lend credibility to your application from the outset.

Limitations and Considerations

The PPH is a powerful tool, but it’s not always the right choice:

• Claim alignment is required: To use the PPH, the claims in your foreign application must sufficiently correspond to the allowed claims from the reference office. This may require amending your claims to align them — which could affect the scope of protection you’re seeking in that country.
• Not all offices participate equally: While the PPH network is extensive, the specific programs available, the eligibility requirements, and the practical benefits vary by office. Some offices have more robust PPH programs than others.
• Timing matters: A PPH request can only be made if you have the required work product in hand. If your U.S. application is still pending, you may need to wait before a PPH request is available — which affects how you sequence your international filings.

How the PPH Fits Into a Global Patent Strategy

The PPH is one of several tools available for managing the cost and timeline of international patent prosecution. It works alongside — not instead of — the PCT process, direct national filings, and Paris Convention priority claims. When I develop an international filing strategy for clients, I evaluate whether PPH eligibility is available and whether using it makes sense given the client’s budget, timeline, and the countries where protection is sought.

I’ve handled patent prosecution in 40+ countries for clients around the world, and leveraging programs like the PPH is one of the ways I help clients get strong, cost-effective protection internationally.

Questions About International Patent Strategy?

Whether you’re just beginning to think about foreign filings or you’re already in the middle of international prosecution, I can help you navigate the options. Schedule a consultation today — the initial $250 fee is credited toward your work if you move forward.

Related Topics:

• What is a PCT Application (or Patent Cooperation Treaty Application)?
• How Do I Protect My Invention in Foreign Countries?
• Can I Tell Others About My Invention Before I File a Patent Application?
• How Can I Speed Up the Patent Process?
• I Haven’t Filed a Patent Application Yet — What Deadlines Should I Be Aware of?