Answer Deadlines in Chinese Trademark Proceedings: Opposition, Cancellation and Invalidation

Introduction: three proceedings, three different clocks

Opposition, non-use cancellation and invalidation are the three contested proceedings a Chinese trademark registration most commonly faces. They are often discussed together, and that is a mistake when it comes to deadlines. The windows for filing a case, the windows for answering, and the way each window starts to run are not the same.

Getting this wrong is expensive in a way that is hard to undo. A missed window in a Chinese trademark proceeding is generally not extendable, and the consequence is usually that the case is decided without your side of it.

The answer windows, side by side

Where the defending party receives a notice to answer, the response windows are:

Opposition — 30 days from the date of receipt of the notice to answer.
Invalidation — 30 days from the date of receipt of the notice to answer.
Non-use cancellation — 2 months from the date of receipt of the notice to answer.

Note the asymmetry. Opposition and invalidation give a month. A non-use cancellation gives two. The reason is practical: a cancellation puts the registrant to proof of actual use, which takes longer to assemble than a legal argument.

How the start point is actually calculated

The start point deserves more attention than it usually receives, for two reasons.

The first day is not counted. Under the Implementing Regulations, the day on which a period begins is not counted within the period. The count starts the following day.

Service is a legal construct. Where a document is served by electronic means it is deemed served fifteen days after it was sent, whether or not anyone opened it. Where it is served by post the date is the postmark date of receipt, or fifteen days after dispatch if the postmark is unclear or missing.

The combined effect is that the window a foreign owner experiences is often shorter than the window on paper, because the start date is fixed by rules rather than by the moment someone reads the notice.

Electronic filing changed the mechanics, not the length

Where an opposition, cancellation or invalidation case is filed electronically, the office's practice is:

The defending party receives a paper notice to answer by post.
At the same time, an electronic copy is sent to the trademark agency most recently recorded for the defending party's business.
Where the defending party has elected electronic replies, all documents other than the notice to answer itself are sent electronically.
Where paper replies have been elected, the defending party receives paper while the applicant's outgoing documents are electronic.

One practical warning attaches to the reply channel. Where the defending party binds the download code and files its answer electronically, it can no longer file the answer on paper. The choice of channel is effectively made when the answer is first filed, so it should be made deliberately rather than by whoever happens to act first.

Supplementary evidence runs on its own timeline

A party that needs to file evidence beyond what accompanies the answer must declare this in the answer, and then file the supplementary evidence within three months of the date the answer was submitted. This is a distinct deadline from the answer window itself, and it is the one most often forgotten. The answer is filed on time, the declaration is made, and then the evidence is assembled too slowly.

What the applicant side should know

The same structure works in reverse. Where the applicant filed electronically, and the defending party has chosen electronic replies, the applicant's outgoing documents are electronic except where evidence is exchanged. Where evidence is exchanged, and the defending party has chosen paper, the applicant receives a paper notice of evidence exchange with a reply binding code and a copy of the answering materials.

For a foreign applicant this means the file should be managed as a single thread of documents with dates, rather than as a set of separate transactions with a Chinese agent.

Filing windows, as distinct from answer windows

The windows above govern a party that is answering a case. The windows for filing a case are different, and confusing the two is a common source of error.

An opposition to a published application must be filed within the opposition period, which under the 2026 revision of the Trademark Law is two months from publication — reduced from the three months that had applied since 1982. An invalidation action is not subject to a short publication window in the same way, but where it is based on relative grounds against a registration that has been in force for more than five years, that five-year limit applies in its own right. A non-use cancellation can be filed only where three consecutive years of non-use are alleged, measured over a period that has already elapsed.

The pattern to hold on to is that filing windows are mostly tied to publication or to the passage of time, while answer windows are tied to service of a notice. They fail in different ways, and a diary system that tracks only one of them will eventually miss the other.

A short worked illustration

Take a hypothetical foreign registrant.

A cancellation is filed against its Chinese registration in early April. The office dispatches the notice to answer electronically on 3 April. The electronic copy reaches the agency of record the same day, and the paper notice goes into the post.

Under the service rules, the document is deemed served fifteen days after dispatch — 18 April. The two-month answer window begins the following day, 19 April, and closes on 18 June.

The registrant learns of the case on 20 May, when its brand manager happens to telephone the agency. It has four weeks, not two months, and if it intends to file supplementary evidence it must declare that in the answer and then file the evidence within three months of the answer.

Nothing in that sequence is unusual. Every step is a routine consequence of the rules, and the whole of the time that felt like cushion was consumed by the deemed service period and by internal delay.

Frequently asked questions

How long do I have to answer an opposition in China?

Thirty days from the date you receive the notice to answer. The start date is calculated under the service rules, so it may be earlier than the date the document came to your attention.

How long do I have to answer a non-use cancellation?

Two months from receipt of the notice to answer. The longer window reflects the work involved in assembling proof of use.

How long do I have to answer an invalidation action?

Thirty days from receipt of the notice to answer, the same as an opposition.

When does the thirty-day period start?

The day the period begins is not counted. The count starts the following day, and the start date is the date of receipt determined under the service rules, which for electronic documents means fifteen days after dispatch.

Can I extend the deadline to answer?

These windows are not, in practice, extendable in the way a commercial deadline might be. The useful precaution is to compute the deadline from the office's service date rather than from the date the notice was noticed.

How long do I have to file supplementary evidence?

Three months from the date you submit the answer, and you must declare the intention to supplement in the answer itself. The declaration is easy; the discipline of the three-month clock is where cases are lost.

Can I switch from electronic to paper replies?

The choice is effectively made when the answer is first filed. Where the download or binding code is used and the answer is filed electronically, a paper answer can no longer be filed. Decide the channel deliberately.