Evidence of acquired distinctiveness: costs drivers
Proving that a mark has become distinctive through use turns a weak filing into a defensible one. The work is document-heavy rather than argument-heavy: the outcome depends on the volume and quality of evidence filed, not on legal theory. The main cost drivers are the number of markets covered, the length of the use period claimed, and whether the evidence already exists in usable form.
What drives the effort
Four factors decide how much work the file requires. The number of jurisdictions matters most, because evidence rarely transfers between markets without local adaptation. The length of the use period claimed matters next: reconstructing a decade of sales data costs far more than pulling last year's figures. A consumer survey, where one is needed, is usually the single most time-consuming component. An existing objection on file narrows the evidence needed but raises the stakes attached to each document submitted.
| Factor | Effect on effort |
|---|---|
| Number of jurisdictions | Each market needs its own sales, advertising and recognition evidence |
| Length of use period claimed | Longer periods require archived material, which is harder to source |
| Consumer survey required | Adds a separate, slow-moving workstream with its own supplier |
| Existing objection on file | Focuses the evidence but raises the cost of every weak point |
The point of no return
An office works with whatever is filed by the deadline; it does not wait for a perfect file. Once the relevant window closes, the argument is fixed to the evidence already on record, and later material is usually disregarded rather than added. The same logic — a moment after which the file can no longer be reshaped — governs a different registry in Opt-out and withdrawal of opt-out, where the deadline is equally unforgiving.
A related transition problem shows up outside trade mark practice as well. The shift from an old rule to a new one, and the narrow window in between, is the subject of What changed in marketing rules token issuance the transition, which deals with a comparable cut-off in a different field.
What to do
- Instruct the client team to locate sales and advertising records for the claimed period before any drafting starts.
- Assign one person as the single point of contact for evidence — split ownership is the most common cause of delay.
- Decide early whether a consumer survey is needed; commissioning it late is the single biggest cause of missed deadlines.
- Draft a short chronology of use, market by market, before assembling exhibits.
- File a first tranche of evidence even if incomplete, then supplement within the window the office allows.
- Keep a running index of every document filed, cross-referenced to the claim it supports.
The same reliance on a documented chain of custody appears in an unrelated field, described in Subcontracting technology contract how it is proved explained: whoever cannot show the paper trail loses the point, regardless of the substance behind it.
Who decides and how long it takes
The relevant trade mark office examines the evidence and decides whether distinctiveness has been shown. Timing depends on the office's own backlog and on whether the other side files observations. A well-prepared file typically draws a first substantive reaction within a few months of submission. A weak or partial file tends to generate a request for more evidence, which restarts a shorter internal clock rather than closing the case outright.
If you are in this situation
If the mark is used in one market only, the file stays narrow and the survey question can usually be resolved alone. If it is used across several jurisdictions, plan for local input on each market's evidence standard before the first filing goes in. If an opposition is already running, the evidence has to answer the specific objection raised rather than build the broadest possible case — a wider file wastes time the clock does not give back.
Sources and limits
This page does not decide whether a particular mark qualifies; that depends on the specific evidence and the specific market, and it is assessed case by case. It does not cover cost figures, since a procedure page states drivers of effort, not price. For a non-EU jurisdiction covered in more depth, our report layer includes markets such as the one in Asset in United Arab Emirates in detail, which sets out what can be established there.
Reviewed against current office guidance and practice as applied in Lithuania and Estonia. Last checked: this month's internal review cycle.
Related publications
A route that avoids the evidence burden altogether, by settling with the other side instead of proving distinctiveness, is covered in Coexistence negotiation: costs drivers.
Frequently asked questions
How long does evidence of acquired distinctiveness take in practice?
A well-organised file typically draws a first substantive reaction within a few months of filing. Weak files take longer, because a request for more evidence restarts part of the process. The total timeline also depends on how many jurisdictions the claim covers and whether an opposition is running in parallel.
Which documents are needed to start?
Sales figures for the claimed period, advertising spend and materials, and any existing market research come first. A chronology of use, market by market, should be drafted before exhibits are assembled. If a consumer survey is needed, the supplier should be engaged early, since that step is the slowest to arrange.
What happens if the other side does not respond?
Silence from the other side does not close the file automatically; the office still examines the evidence on its own terms. A missed deadline on their part can narrow their own argument, but it does not remove the need to file complete evidence on your side. The clock for your own submission runs regardless of what the other side does.