Opposition before the granting office: what the decision maker looks at
Opposition before the granting office is a written challenge to a patent that has already been granted, filed within a short window that opens at grant. The decision maker weighs the grounds raised against the evidence filed, then maintains, narrows or revokes the patent. Miss the window, or file grounds without matching evidence, and the route closes for good.
What changes once the notice is filed
Filing does not pause the patent's effect. The right stays enforceable while the case runs, unless a separate order says otherwise. Licensing talks, freedom-to-operate checks and infringement claims can all continue in the meantime.
What changes is the burden of proof. The office now has to decide, and until it does, every claim under attack carries a shadow of doubt. A counterparty negotiating a licence, or a competitor weighing a freedom-to-operate opinion, will usually factor that uncertainty into its own timing.
The office does not re-examine the invention from first principles. It looks only at the grounds the opponent actually raised, and only at the evidence tied to those grounds. A ground mentioned in passing, without evidence attached to it, is unlikely to carry weight later in examination.
Grounds that carry weight
Most notices rely on a combination of the following. Each needs its own evidence — stacking grounds without matching proof for each one weakens the notice rather than strengthening it.
- Novelty — the claimed invention, or something falling within it, already existed before the filing date.
- Inventive step — the claimed invention would have been an obvious next move for someone working in the field, given what was already available.
- Insufficient disclosure — the patent does not explain the invention clearly enough for a skilled person to actually carry it out.
- Added subject-matter — the granted claims cover more than what the original filing actually described.
A notice built on one well-evidenced ground usually outperforms a notice built on four thin ones.
Stages, in order
| Stage | What happens | Who acts |
|---|---|---|
| Filing | Opponent files grounds and evidence inside the fixed window after grant | Opponent |
| Formalities check | Office confirms the notice is complete and admissible | Registry unit |
| Response | Patent holder replies, often amending the claims | Patent holder |
| Further exchange | Both sides may file additional observations on the amended position | Both parties |
| Examination | Decision-making division weighs grounds, evidence and both replies | Decision-making division |
| Decision | Patent maintained, maintained in amended form, or revoked | Decision-making division |
| Appeal | Either side may challenge the decision inside a further fixed window | Appeal body |
The point of no return sits at the first row. Once the filing window closes without a complete notice, or the notice is filed without evidence linked to its grounds, the route ends. It does not reopen later if better evidence turns up, and it does not reopen for a different opponent raising the same point.
What to do
- Confirm the filing window is still open by checking the grant publication date before drafting anything else.
- Match each ground you intend to raise to evidence you already hold; drop any ground you cannot support.
- Draft the notice around reasoned arguments per ground, not a general objection to the grant as a whole.
- File the complete notice inside the window — a partial filing does not preserve the right to add grounds afterwards.
- Expect amended claims from the patent holder during the response period, and prepare a reply aimed at the narrowed wording.
- Track office communications through examination; internal deadlines inside the procedure tend to be shorter than the filing window itself.
Who decides, and on what timeline
The forum is administrative, not judicial: a decision-making division inside the granting office, sitting apart from the examiner who granted the patent. It sets its own schedule for formalities, response and examination, case by case, rather than following one fixed overall calendar.
An appeal against the decision goes to a separate appeal body within the same office structure. That body reviews the decision itself; it is not a national court, and reaching a national court, if that becomes necessary, is a separate step taken afterwards.
Where the path splits
If the patent holder amends the claims during the response period, grounds and evidence already filed need checking again against the narrowed wording. An argument that worked against the original claim does not automatically carry over to a claim that has been cut back.
If the invention behind the patent involved a freelance contributor who never signed an assignment, ownership questions can surface alongside the opposition and need resolving on a separate track. Media, content and streaming freelancers signed nothing in detail sets out what the register actually shows in that situation.
If licensing income tied to the patent is structured through tokenised or on-chain royalty terms, a narrowed or revoked claim can change what those arrangements actually cover, separately from what the patent itself covers. When royalties encoded on-chain are ignored in detail looks at what that mismatch costs if it is left unresolved.
What this page does not cover
This page does not cover revocation actions brought after opposition has already closed, court litigation running in parallel over the same patent, or fee schedules set by the granting office itself. Each of those runs on its own track, with its own forum and its own timing.
It also does not replace a check on who you are actually dealing with before committing time to a filing. Counterparty report before appointing a developer explained covers that separate, earlier step.
Verified
Checked against the granting office's published opposition and examination guidance, current at the time of writing. Fee schedules set by the office are not reproduced here. The review date for this page is shown in its metadata.
FAQ
What does the decision-maker look at first?
Whether each ground raised within the opposition period is supported on the written record. Grounds introduced late, or evidence filed in a language the office does not use for the proceeding, are set aside before the merits are weighed.
Which deadline is already running?
The opposition period. Once it closes, no new opposition against the same grant can be filed by that party, and grounds left unraised are excluded from the file that follows.
Who decides, and on what evidence?
The opposition body inside the granting office decides first, on the written record and any hearing held; its reasoned decision can usually be challenged before a separate appeal body inside the same office.