Revocation proceedings: what the decision maker looks at
A revocation request stands or falls on a small number of questions: is the patent new, does it involve an inventive step, is the disclosure sufficient to work the invention, and did the applicant have the right to file it at all. The decision maker checks each ground against the file as it stood on the filing date, not against evidence produced afterwards.
What the decision maker examines
Revocation is not a single test. It is a set of separate grounds, and a request can rely on one or several at once. The table below sets out what is typically checked and what kind of evidence carries weight.
| Ground | What is checked | Typical evidence |
|---|---|---|
| Novelty | Was the invention already disclosed, anywhere, before the filing date | Prior publications, earlier filings, public demonstrations |
| Inventive step | Would the step have been obvious to a skilled person at the time | Expert opinion, comparison with the closest known solution |
| Sufficiency of disclosure | Could a skilled person actually carry out the invention from the description | The patent text itself, sometimes a reproduction attempt |
| Added subject matter | Was anything introduced during prosecution that was not in the original filing | Comparison of filed and granted versions |
| Entitlement | Did the applicant have the right to file, or should someone else have been named | Employment or engagement terms, assignment records, correspondence |
Entitlement disputes are common where a former contractor or engineer claims to be the true source of the invention. The same ownership question surfaces outside patents too, including where a contractor claims rights over code — see Photonics and instrumentation a contractor claims ownership of the.
Formal grounds exist as well — unpaid fees, missing translations, procedural defects — but they rarely decide a contested case on their own. Most disputes turn on novelty or inventive step, because most patents that reach a hearing have already survived the office's own examination once.
What changes once proceedings are filed
Filing a revocation request does not suspend the patent. It stays enforceable, and the owner can keep licensing it or suing on it, until a decision says otherwise. What does change is leverage: a licensee negotiating renewal terms, or a defendant in a parallel infringement action, now has a live challenge to point to.
A pending request also changes how damages calculations are treated in a parallel dispute. A court hearing an infringement claim will often want to know the outcome of the revocation request before it fixes a final figure, because a revoked patent cannot found a damages award for the period after revocation takes effect.
Steps to take
- Collect the prosecution file first — the description, claims and any amendments made during examination, not just the granted text.
- Instruct someone to run a targeted prior art search before drafting the request, not after; a weak novelty argument wastes the filing fee and the first hearing slot.
- Identify the correct forum before filing — a national office, the granting office, or a dedicated patent court, depending on where and how the patent was granted.
- Set out each ground separately in the request. A request that blends novelty and inventive step arguments without distinguishing them is harder to decide and easier to dismiss.
- Prepare for a response from the patent owner. Most systems give the owner a chance to amend the claims rather than lose the patent outright.
- Keep a parallel eye on any related infringement or licensing dispute. The two proceedings usually affect each other's timing.
Who decides and how long it takes
The forum depends on the right in question. A request against a nationally granted patent goes to the office that granted it, or to a national court, depending on the system. A request against a unitary patent goes to a dedicated European patent court set up for that purpose. Whichever forum applies, the same person or panel that decides validity also has the power to allow amended claims rather than revoke outright.
There is no single timeline that applies across systems. A request typically moves through a written phase, an opportunity for the owner to respond or amend, and a hearing or written decision. Straightforward cases with a single clear prior art document move faster than cases resting on inventive step, where expert evidence and cross-examination take longer to arrange. The office or court managing the file sets its own calendar once the request is admitted.
If your situation differs
If you are the one defending the patent, the point of no return is usually the deadline to respond with amended claims — miss it, and the office decides on the claims as granted, with no fallback position.
If the patent has been pledged as security for financing, revocation removes the collateral value the lender was counting on. The same mechanics apply, in a different register, where a tokenised right is pledged and then challenged — see When a right is pledged on-chain in detail.
If the patent is jointly owned, check the co-ownership terms before filing anything. Some systems require every co-owner to act together in a revocation defence, and a missing signature can delay the response past the deadline.
What this page does not cover
This page describes the mechanics of a revocation request — grounds, stages, forum, and timing pressure points. It does not set out statutory deadlines, fee tables, or article-level citations, because those vary by jurisdiction and change independently of the procedure itself.
It also does not cover what happens before a dispute reaches this stage — whether the counterparty holding the patent is worth pursuing at all. That question belongs upstream, before any filing decision is made — see Counterparty report before extending credit explained.
Verified
This overview was checked against current procedural practice as we track it internally, without relying on a single external citation, in line with how procedural pages on this site are built. We publish our own turnaround figures separately rather than folding them into legal content — see Delivery statistics, published automatically overview step by step. Last reviewed as part of the current content cycle.
Related reading
Revocation and preliminary injunctions often sit on opposite sides of the same dispute — one side asking to stop use now, the other asking to remove the right altogether. See Preliminary injunction step by step.
Frequently asked questions
How long do revocation proceedings usually take?
There is no fixed figure. Duration depends on which ground is argued, whether the owner amends the claims, and how the particular office or court schedules its hearings. Inventive-step cases with expert evidence take longer than single-document novelty cases.
Which documents does a party need to start?
At minimum: the granted patent text, the full prosecution history, and the prior art or other evidence supporting each ground raised. A request that names a ground without attaching supporting material is usually returned or rejected on formal grounds before it is even examined on the merits.
What happens if the patent owner never responds?
Most systems still require the decision maker to examine the request on its merits rather than grant it automatically. Silence from the owner removes the chance to amend the claims or argue against the evidence, which in practice makes revocation on the pleaded grounds considerably more likely.
For how this fits into the wider patent practice, see Patent protection, disputes and recovery overview in practice.