When an ex-employee appears as an inventor elsewhere: what it costs to be wrong
An ex-employee named as inventor elsewhere does not settle ownership. If the invention was created within the scope of employment, the employer may still hold the right to it, but that right must be asserted, not assumed. Delay narrows the evidence and the remedies available.
What governs ownership here
Ownership of an employee invention is decided under national law, not under an EU regulation. Lithuania and Estonia each set their own rules for inventions made by staff during employment, including who counts as inventor and who is entitled to the right.
Where the competing filing has already become a European patent with unitary effect, the entitlement question also engages the framework set out in the Agreement on a Unified Patent Court and in Regulation (EU) No 1257/2012 implementing enhanced cooperation in the area of the creation of unitary patent protection. Translation arrangements for that unitary right are set out in Council Regulation (EU) No 1260/2012, and they matter once evidence has to travel across languages.
What changes while this is unresolved
While ownership is unresolved, three clocks are already running. The priority date attached to the outside filing does not wait for anyone to notice it. Publication, usually eighteen months after filing, puts the invention into the public record regardless of who holds the right. The underlying problem — the person named on the record is not necessarily the person entitled to it — recurs in other registries too; see When a transfer on-chain is not recorded off-chain and for the same mismatch in tokenised assets. Evidence — laboratory notebooks, emails, employment records — degrades with every month of delay, and witnesses move on to other employers.
What to do
- Pull the employment contract and any invention-disclosure or assignment clause before doing anything else — legal must confirm the scope-of-employment question first.
- Identify the exact filing: publication number, applicant, filing date, and named inventors — a patent attorney should verify this against the public register.
- Collect internal evidence that the invention was created within the employee's duties: project records, timesheets, prior internal disclosures to management.
- Where evidence-gathering touches personal data about the former employee, check the basis for that processing before compiling a dossier — see Legitimate interest assessment: summary and its limits.
- Send a reasoned notice to the outside applicant asserting the prior right, with a stated response deadline — counsel drafts and signs this.
- File an entitlement action in the forum shown below, before the deadline attached to that forum runs out.
Who decides
Who decides depends on what kind of right the outside filing has already become.
| What the outside filing is | Forum for the entitlement dispute | Governing framework |
|---|---|---|
| National patent application | National court of the state where it was filed | National law |
| European patent with unitary effect | Unified Patent Court | Agreement on a Unified Patent Court, Regulation (EU) No 1257/2012 |
| Classic European patent bundle, not unitary | National court, or the Unified Patent Court where the right has not been opted out | Agreement on a Unified Patent Court |
In every row, the clock starts at publication or grant, not at the moment you discover the filing.
Three ways this splits
If the outside filing is still a national application in the country where the employee worked, national law on employee inventions governs both ownership and any compensation owed to the named inventor.
If the outside filing has already become a European patent with unitary effect, the entitlement dispute sits with the Unified Patent Court, and the record of the invention's origin must be assembled in a form that court accepts across languages.
If the dispute concerns not a patent but a shared data set the employee worked on before leaving, the ownership question runs on a different track — see When a data set was assembled by an intern for how that track differs from a patent claim.
What this page does not resolve
This page does not decide whether the invention falls inside or outside the scope of employment — that turns on facts specific to the role and the contract, not on a general rule. It does not cover statutory compensation formulas for employee inventors, which are set by national law and vary between Lithuania and Estonia. It does not cover customs measures against products already on the market under the competing filing; once entitlement is settled, seizure of infringing goods at the border is a separate mechanism under Regulation (EU) No 608/2013, not a substitute for establishing the right first.
Before this reaches a court, most of the actual cost sits in verifying who else the outside applicant has worked with and what else they have filed — the same verification used before bringing on a new developer or co-inventor; see Counterparty report before appointing a developer step by step for how that check runs.
Verified
Checked on 4 March 2025 against the sources below. National law on employee inventions was not sourced from a registry entry and should be confirmed for the specific jurisdiction before acting.
- Agreement on a Unified Patent Court
- Regulation (EU) No 1257/2012
- Council Regulation (EU) No 1260/2012
- Regulation (EU) No 608/2013
Related reading: When a distributor is sued over your product explained.
FAQ
What is the first step when an ex-employee appears as an inventor elsewhere?
Pull the employment contract and any invention-disclosure clause, then identify the exact filing — publication number, applicant, and filing date. Nothing else is worth doing before those two facts are confirmed.
Which deadline is already running?
The priority date attached to the outside filing runs from the moment it was filed, not from when you found out. Publication, usually eighteen months later, is a second fixed point that does not move.
Who decides, and on what evidence?
A national court decides for a national application; the Unified Patent Court decides for a European patent with unitary effect. Either way, the decision turns on employment records, disclosure logs, and the terms of the original contract.