Revocation proceedings: what the other side does
When a competitor or third party moves to revoke your patent, the sequence is predictable: a formal request, a notice to you, an exchange of evidence and arguments, and a decision by the competent body. Recognising each stage early lets you protect your position and respond within the time available, rather than reacting under pressure.
What changes once revocation proceedings start
The moment a revocation request is filed, the clock starts running for you as the patent holder. Deadlines for a formal response, evidence submission and any request for an oral hearing begin from the date of notice, not from the date you read it. Your patent stays formally in force during the proceedings, but its commercial value can drop immediately: licensees grow cautious, negotiations stall, and enforcement against infringers becomes harder to justify while validity is contested.
The other side usually files with a clear objective: either to clear the way for their own product, or to gain leverage in a separate licensing or infringement dispute. Their filing will set out the grounds for revocation — commonly lack of novelty, lack of inventive step, or insufficient disclosure — supported by prior art or expert statements.
What to do now
- Read the notice in full and identify the deadline for your response before doing anything else.
- Instruct a patent attorney or in-house counsel to assess the grounds and the strength of the cited prior art.
- Gather your own file history: examination correspondence, prior amendments and any earlier validity assessments.
- Decide whether to defend the claims as granted or to propose an amendment that narrows them.
- Confirm whether an oral hearing is available and, if so, whether requesting one helps your position.
- Keep a written log of every deadline and filing from the date of the first notice.
Who decides and how long it takes
The deciding body depends on where the patent was granted and how it is protected. A national patent office, a national court, or the Unified Patent Court may be the forum, depending on the route chosen when the patent was filed or validated. Whichever forum applies, the structure of the proceedings is broadly the same.
| Stage | What the other side typically does | Rough timing |
|---|---|---|
| Filing the request | Submits grounds for revocation with supporting evidence | Single filing, triggers your deadline immediately |
| Formal examination | Forum checks admissibility, fees and formal requirements | Weeks |
| Written exchange | Files a reply to your response, adds expert opinions if needed | Several months |
| Oral hearing, if held | Presents arguments, may narrow or drop parts of the challenge | Scheduled once written exchange closes |
| Decision | Awaits the ruling, may lodge an appeal | Months after the hearing, longer if appealed |
Complex cases with multiple experts or parallel disputes in several countries tend to run well beyond a year from filing to a first decision. Straightforward cases with a single, clear ground can conclude faster.
Two common scenarios
- If the revocation request is combined with a separate ownership dispute over the underlying invention, the two proceedings may need to be coordinated rather than run in isolation — the question of who actually owns the result is addressed separately: When a contractor claims ownership of the code explained.
- If the patent in question is licensed out under a tokenised or on-chain licensing structure, a revocation decision can trigger termination clauses in that licence independently of the patent proceedings themselves: Termination of a tokenised licence step by step explained.
- If the other side files but then goes quiet after the initial notice, do not assume the matter is closed — check the applicable procedural rules on default before treating the challenge as withdrawn.
What this page does not cover
This page describes the procedural sequence only. It does not set out the substantive standards for novelty or inventive step, and it does not name specific statutory provisions — those depend on the forum and jurisdiction chosen for your patent and sit outside a general procedural overview.
It also does not tell you who is behind the revocation request or whether they have the standing and resources to see it through. That is a due-diligence question rather than a procedural one. For what can be established about a party bringing a challenge from a given jurisdiction, see Counterparty in Singapore in detail.
Verified
Reviewed May 2025. This overview reflects the procedural sequence used across the major patent revocation forums referenced above; it does not rely on a single named source and is updated as forum practice changes. Cookie handling on this page follows our standard approach: Cookies and what is switched off by default overview.
Related reading
If the dispute you are facing involves an urgent request for interim relief rather than a revocation, the opposing side's playbook is different: Preliminary injunction step by step.
Frequently asked questions
How long does revocation proceedings take in practice?
There is no fixed duration. A case built on a single, well-documented prior art reference can reach a first decision within months. A case with multiple grounds, expert evidence and an oral hearing routinely runs beyond a year, and an appeal extends that further.
Which documents are needed to start?
The party bringing the challenge needs a formal request stating the grounds for revocation, identification of the patent and claims attacked, and the evidence supporting each ground — typically prior art documents, expert statements, or both. Formal requirements vary by forum, so the exact document set should be confirmed against the rules of the specific office or court before filing.
What happens if the other side does not respond?
As patent holder, if you do not respond within the set deadline, most forums treat the claims as undefended on the points raised, which can lead to revocation without a full hearing on the merits. If you are the one bringing the challenge and the patent holder stays silent, check whether the forum requires a further step before treating the matter as resolved in your favour — silence is not always the same as a decision.