China Expands Patent Prosecution Highway (PPH) with USPTO and EPO | Faster CNIPA Examination

For foreign applicants seeking patent protection in China, the standard examination queue for invention patents can take 2‑3 years or longer. However, the China National Intellectual Property Administration (CNIPA) has significantly expanded its Patent Prosecution Highway (PPH) program with the United States Patent and Trademark Office (USPTO) and the European Patent Office (EPO). Under the expanded PPH agreements, applicants who have received a favorable ruling (allowance) from the USPTO or EPO on corresponding patent claims can request accelerated examination at CNIPA, reducing the average timeline to 12‑18 months – often with a much higher allowance rate. This guide explains the PPH mechanism, the scope of the expanded agreements, the application process, and practical strategies for foreign applicants to leverage PPH for faster, more predictable patent prosecution in China.

1. What Is the Patent Prosecution Highway (PPH) and How It Works

The Patent Prosecution Highway is a set of bilateral agreements between patent offices that allow an applicant who has obtained a favorable ruling (allowance) from one office to request accelerated examination of corresponding claims in another office. The underlying principle is that if claims are considered patentable by one office, they are likely to be patentable in the other, saving examination resources and reducing pendency.

Under the PPH framework, an applicant files a request with the second office (e.g., CNIPA) after receiving a notice of allowance or a positive written opinion from the first office (e.g., USPTO or EPO). The second office then fast‑tracks the examination, typically within 2‑4 months from the request, and the overall timeline from filing to grant can be reduced from 2‑3 years to 12‑18 months.

CNIPA has had PPH agreements with the USPTO since 2011 and with the EPO since 2012. In 2026, both agreements have been expanded to cover more technical fields, simplify documentation requirements, and extend the validity period. As of January 1, 2026, the PPH program with the USPTO and EPO has no numerical cap on requests, and the scope now includes all technology areas (previously some fields like biotechnology were excluded).

2. Expanded PPH Agreements Between CNIPA and USPTO/EPO (2026 Updates)

The 2026 updates to the CNIPA‑USPTO and CNIPA‑EPO PPH agreements introduce the following improvements:

• No technology exclusions: Previously, some fields (e.g., biotechnology, chemical processes) were excluded or faced additional requirements. Under the 2026 agreements, all technical fields are eligible.
• Simplified documentation: Applicants no longer need to submit certified copies of the foreign office‘s documents; a simple reference to the corresponding application and a machine translation (if the original is not in English) is sufficient. For USPTO applications, English originals are accepted without translation; for EPO, English or French originals are accepted, but Chinese translations of the claims are still required (simplified).
• Extended participation: The agreements have been renewed for an indefinite period (no expiration date). Previously, renewals were required every 3‑5 years.
• PCT‑PPH also expanded: For international applications under the Patent Cooperation Treaty (PCT), if the International Searching Authority (ISA) issues a favorable written opinion or international preliminary report on patentability (IPRP), applicants can also request PPH at CNIPA. This route is particularly useful for applicants without a prior US or EP filing.

The number of PPH requests filed by foreign applicants at CNIPA has grown by over 40% in 2026 compared to 2025, reflecting increased awareness and streamlined procedures.

3. Eligibility Requirements for PPH Requests at CNIPA

To qualify for PPH accelerated examination at CNIPA, the following conditions must be met:

• Corresponding application: The Chinese patent application must correspond to the US or EP application that received a favorable ruling. Correspondence means that the Chinese claims are sufficiently similar to the allowed claims (they may be narrower or have minor formatting differences, but cannot be broader in scope).
• Favorable ruling: The applicant must have received a notice of allowance (for US) or a decision to grant (for EP) from the respective office. Alternatively, a positive written opinion from the USPTO (non‑final) or the EPO’s examination division may be accepted if it indicates patentability of all claims.
• Pending Chinese application: The Chinese application must be pending (not yet granted or finally rejected) and must have entered the national phase (for PCT) or be a direct filing.
• Request timing: The PPH request must be filed before CNIPA starts substantive examination. Usually, the best time is within 6 months of the Chinese filing date or upon entry into the national phase. Filing early avoids examination delays.

Note: If the USPTO or EPO office action required amendments to the claims, the Chinese claims must reflect those amendments. Any claim that was not allowed in the foreign office cannot be included in the PPH request (unless it is a dependent claim that depends on an allowed independent claim).

4. Step‑by‑Step PPH Application Process at CNIPA

The PPH request procedure at CNIPA is straightforward and can be handled by a local patent agent. The steps are:

1. Obtain the favorable ruling from USPTO or EPO. For US, a Notice of Allowance (NOA) or an Office Action stating that all claims are allowable. For EP, a Decision to Grant or a communication indicating that the application is in order for grant.
2. File the Chinese patent application (if not already filed). Ensure that the claims are at least as narrow as the allowed foreign claims. It is advisable to file the Chinese application as soon as possible after the foreign filing to preserve priority.
3. Submit the PPH request using CNIPA’s online form (Form PPH-1). The request must include: (a) a completed request form; (b) a copy of the foreign office‘s decision (NOA or grant decision); (c) a copy of the allowed claims (in English for US, in English or French for EP); (d) a Chinese translation of the allowed claims (certified translation is not required, but a reliable translation must be provided); (e) a claim correspondence table (mapping the Chinese claims to the allowed foreign claims).
4. Pay the PPH request fee. CNIPA charges a small fee (RMB 1,000) for PPH requests. Expedited examination is provided at no additional cost beyond the standard examination fees.
5. Wait for CNIPA to grant the PPH request. CNIPA typically approves the request within 1‑2 months. Upon approval, the application enters the accelerated examination queue.
6. Respond to any office actions. Even with PPH, CNIPA may issue office actions. However, because the claims have already been allowed abroad, objections are usually limited to formal matters or China‑specific requirements (e.g., translation errors, unity of invention).

The entire process from PPH request to grant typically takes 12‑18 months, compared to 24‑36 months for standard examination. In many cases, the first office action is received within 2‑3 months of the PPH request.

5. Expected Timeline and Allowance Rate Improvements

Data from CNIPA shows that PPH requests result in significantly faster prosecution and higher allowance rates:

• Time to first office action: Average 2‑3 months (standard: 12‑18 months).
• Total time to grant: Average 12‑18 months (standard: 24‑36 months).
• Allowance rate: Over 85% for PPH applications, compared to about 55‑60% for standard applications. The higher allowance rate is due to the prior positive examination by USPTO/EPO, but also because applicants tend to file stronger applications.
• Number of office actions: On average, PPH applications receive 0.5 office actions (i.e., many are allowed without any action), while standard applications receive 2‑3 office actions.

The expanded PPH program has also reduced the backlog at CNIPA for foreign‑origin applications, benefiting all applicants.

6. Limitations and When PPH Is Not Recommended

While PPH offers significant advantages, it is not always the best strategy. Consider the following limitations:

• Claim scope may be limited: The Chinese claims must be narrower or equal to the allowed foreign claims. If you wish to obtain broader protection in China than what was allowed in the US or EP, PPH is not suitable. You may need to file a separate application or use the standard examination route.
• Translation costs and timing: Preparing a faithful Chinese translation of the allowed claims requires a skilled translator. Errors can lead to office actions or loss of priority. The cost (typically RMB 2,000‑5,000) is moderate.
• Not available for design patents or utility models: PPH only applies to invention patents (utility patents). Utility models and designs cannot use PPH.
• If the foreign application is still pending without a favorable ruling: PPH cannot be used until a favorable ruling is received. However, you may consider filing a request for accelerated examination under other programs (e.g., the “Green Channel” for environmentally friendly technologies).
• If the foreign office rejected some claims: You can still file a PPH request for a subset of claims that were allowed. The Chinese application must be limited to those allowed claims; you cannot include rejected claims.

Before filing a PPH request, consult with a Chinese patent attorney to assess whether the allowed foreign claims align with your commercial objectives in China.

7. Practical Tips for Foreign Applicants Using PPH in China

To maximize the benefits of PPH, foreign applicants should adopt the following strategies:

1. File the Chinese application as early as possible. Even if the foreign application is not yet allowed, file the Chinese application claiming priority from the first filing. This preserves your priority date and allows you to later request PPH once the foreign allowance is received.
2. Maintain claim consistency. Use the same patent attorney or firm to draft both the foreign and Chinese applications to ensure that the claims can be easily aligned. Avoid making unnecessary changes.
3. Keep the Chinese claims narrow enough to match the allowed foreign claims. If you anticipate that the foreign examiner may require narrowing amendments, draft the Chinese claims with similar limitations from the outset.
4. Use the PCT‑PPH route if you lack direct US/EP filings. File an international application and request an international preliminary examination (Chapter II). If the IPRP is positive, you can use PCT‑PPH at CNIPA when entering the national phase.
5. Work with a Chinese agent who is experienced in PPH. Many local agents have dedicated PPH teams that can prepare the claim correspondence table and translations efficiently.
6. Consider filing multiple PPH requests for a family of patents. If you have several related applications, each can qualify independently.

8. Practical Compliance Roadmap for Foreign Applicants

Follow this five‑step roadmap to successfully use the PPH program for faster patent examination in China:

1. Step 1 – File the Chinese application early. Within the priority year (12 months from the first filing), file a Chinese application claiming priority. Use a local agent.
2. Step 2 – Obtain a favorable ruling from USPTO/EPO. Prosecute the foreign application diligently. Once you receive a Notice of Allowance or a positive opinion, act quickly.
3. Step 3 – Prepare the PPH request package. Engage your Chinese agent to: (a) verify claim correspondence; (b) translate allowed claims; (c) complete the request form. Double‑check that the Chinese claims are no broader than the allowed foreign claims.
4. Step 4 – Submit the PPH request to CNIPA online. Pay the fee (RMB 1,000). Track the status through CNIPA’s portal.
5. Step 5 – Respond to any office actions promptly. Even with PPH, CNIPA may issue a first office action. Respond within the statutory period (usually 2‑3 months).

By following this roadmap, applicants can significantly reduce patent prosecution time and gain stronger patent protection in China.

Summary: China‘s expanded Patent Prosecution Highway (PPH) program with the USPTO and EPO allows foreign applicants to accelerate CNIPA invention patent examination using allowed claims from the US or Europe. The 2026 updates remove technology exclusions, simplify documentation, and extend the program indefinitely. Under PPH, average examination time is reduced from 24‑36 months to 12‑18 months, with allowance rates exceeding 85%. Eligibility requires a corresponding Chinese application, a favorable ruling from USPTO/EPO, and claim correspondence. The PPH request process is straightforward and involves submitting the foreign office’s decision, allowed claims, translations, and a claim correspondence table. Limitations include narrower claim scope and unsuitability for design patents. By following the practical roadmap – filing early, maintaining claim consistency, and working with an experienced local agent – foreign applicants can secure faster, more predictable patent protection in China’s critical market.