PCT Entry into China: Lessons from my 45-day Journey with Sarah, a British Inventor
Sarah contacted me in October. She was 31 months from her priority date — nine months before her Chinese national phase deadline — and she had been putting off the conversation because she wasn’t sure she could afford it.
Over the next 45 days, we worked through every dimension of her China patent decision together. What follows are the lessons that came out of that process. They apply to almost any foreign inventor considering PCT entry into China.
Day 1–7: Understanding what you’re actually entering
Sarah’s PCT application had been filed in the UK. She had used a UK attorney, received a PCT international search report with some objections, and largely moved on. When I pulled up the document, the claim set was ambitious — twelve independent claims, broad functional language, coverage across three distinct embodiments.
The first lesson came immediately: the document you filed under the PCT and the document that will survive Chinese examination are often two very different things.
CNIPA examiners work from the Chinese translation. They apply Chinese patent law, which has its own interpretations of terms like “substantially” and “approximately.” The international search report had flagged prior art that, in a Chinese examination context, would likely cause issues on at least four of her independent claims.
Lesson 1: Start the China-specific analysis at least 12 months before your deadline — not 6.
Day 8–20: The translation question
Sarah had assumed we would simply translate the existing PCT document into Chinese. What she hadn’t considered is that translation is both a linguistic and a legal act.
We spent two weeks working through her Chinese translation with a technical translator who specialised in UK-origin engineering language. Several terms in her specification had multiple plausible Chinese equivalents — and each choice carried a different scope implication under Chinese patent law.
One term — a surface treatment described as “polished to a smooth finish” — had a literal Chinese rendering that CNIPA examiners would likely interpret as requiring a specific surface roughness measurement. We rewrote the passage to describe the functional outcome rather than the finishing process, backed by an example from her drawings.
Lesson 2: Translation is a strategic decision, not just a language exercise.
Day 21–35: Claim strategy for CNIPA
We narrowed the claim set from twelve independent claims to four. This was not a retreat — it was a focus. The four we kept mapped directly to her commercial product, covered the manufacturing process she was actually using, and had the strongest prior art position.
The other eight claims were not abandoned. They were moved to dependent claims, giving us options during examination while reducing the surface area for initial rejection.
Lesson 3: Fewer, stronger independent claims outperform many weak ones at CNIPA.
Day 36–45: The filing decision
On day 36, Sarah asked the question I hear from almost every foreign inventor: “Do I actually need this patent in China, or am I just filing because that’s what you do?”
It is a fair question. Her product had no current distribution in China. Her manufacturer was in Taiwan. But her market projections showed Southeast Asia as her next expansion target — and several of those markets are increasingly influenced by Chinese supply chains. A defensive filing by a Chinese competitor, using her unprotected technology, could lock her out.
We filed. Not out of habit, but because the risk calculus was clear: the cost of entry was modest compared to the exposure she would face if a Chinese manufacturer reverse-engineered her product and filed a defensive utility model around it.
Lesson 4: The question is not whether to file — it’s whether to file strategically.
What the 45 days taught me
Sarah’s situation was not unusual. Most foreign inventors arrive at the China national phase deadline with documents that haven’t been reviewed for Chinese-specific risk, translations that haven’t been stress-tested against CNIPA’s reading habits, and claim sets built for the PCT international phase — not for a Chinese examination.
The 45 days we spent together compressed what should have been years of forward planning into a focused, defensible process. What came out the other side was a China patent application built for China — not a PCT application that happened to be filed there.
If you have a PCT deadline approaching and want to think through your China entry before the clock runs out, our team can review your application, identify the specific risk points, and help you define a filing strategy that fits your business.
Learn more about China patent filing or speak directly with a China patent attorney about your timeline.
