Germany’s Gesetz über Arbeitnehmererfindungen (Employee Inventors Act, abbreviated ArbnErfG or ArbEG) is the statute that governs who owns an invention made by an employee in the course of their work, and how that employee must be compensated when the employer commercializes it. For most of the law’s history, university researchers were carved out of it entirely by a separate rule, the so-called Hochschullehrerprivileg (“professor’s privilege”), which let university academics own and exploit their own inventions the way independent inventors do. A 2002 reform abolished that privilege and folded university inventors into the general ArbnErfG framework — but added a dedicated provision, § 42 ArbnErfG, that sets university compensation differently from the formula used for private-sector employees. This guide explains how the statute now applies to academic researchers, what the widely-cited “30%” figure actually refers to, and what it means for institutions and international partners handling co-invention, licensing, or collaboration agreements involving a German university.
What the Arbeitnehmererfindungsgesetz Covers
ArbnErfG applies to Diensterfindungen (“service inventions”) — inventions an employee makes either as part of their assigned duties or substantially drawing on the employer’s experience or resources. Where a service invention exists, the employer may formally claim it (Inanspruchnahme), which transfers the rights to the employer in exchange for a statutory duty to compensate the inventor. The law also covers free inventions (freie Erfindungen) made outside the scope of employment, which the employee generally retains, subject to a right of first refusal for the employer in some circumstances. This basic structure — employer claim in exchange for statutory compensation — is the same logic behind the United States’ Bayh-Dole framework for federally funded inventions, though the mechanics differ substantially; see CASRAI’s Bayh-Dole Act entry for the U.S. comparison.
The End of the Professor’s Privilege at German Universities
Until a reform that took effect 7 February 2002, German university faculty (Hochschullehrer) were exempt from ArbnErfG under the Hochschullehrerprivileg: inventions they made belonged to them personally, not to their university, mirroring the “professor’s privilege” model that a handful of other European systems retained (Sweden’s lärarundantaget is the most-cited example still operating in a major research system). The 2002 reform repealed that exemption and brought university researchers under the general employer-claim structure, so that a German university can now claim ownership of a faculty invention the same way a private employer can. See CASRAI’s Professor’s Privilege entry for the broader European context and how the model differs where it still applies.
Because bringing universities fully under the ordinary private-sector compensation formula would have been a poor fit for academic research — where inventions often emerge from publicly funded, collaborative, cross-institutional work rather than a single commercial R&D pipeline — the legislature added a separate section, § 42 ArbnErfG, specifically for inventions made by teaching and research staff at institutions of higher education.
The § 42 Rule: Compensation Set at 30% of Gross Revenue
§ 42 ArbnErfG (in force since the 2002 reform) sets the compensation owed to a university employee-inventor, once the institution has claimed and commercialized their invention, at a flat 30 percent of the gross revenue the institution earns from exploiting it — for example, licensing income or a sale of the rights — rather than requiring the case-by-case valuation the general private-sector formula uses (see below). Where an invention has multiple co-inventors, that 30% pool is then apportioned among them according to their individual contribution.
A few points research administrators handling German co-inventorship or licensing should know about how § 42 operates in practice:
- The percentage applies to revenue actually realized, not to an estimated invention value. If the university’s technology transfer office never licenses or otherwise monetizes the invention, no compensation is owed under this provision, regardless of the invention’s underlying merit.
- It applies specifically to inventions by teaching and research staff at institutions of higher education (Hochschulen) — the statute’s own text addresses “Erfindungen von Lehrkräften an Hochschulen.” Whether it extends cleanly to every category of research staff at externally funded, non-university public research organizations (e.g., the Max Planck, Helmholtz, Leibniz, or Fraunhofer institutes, which sit outside the university system proper) and to third-party-funded (Drittmittel) research specifically has been a genuinely litigated and discussed question in German legal-practice commentary — institutions should confirm current treatment with German patent counsel rather than assume automatic coverage for a specific non-university research organization.
- The 30% figure is frequently described in legal-practice literature as substantially more generous to the inventor than outcomes typically produced by the general formula that applies to private-sector employees, which is one reason it is treated as a distinct, notable feature of German university IP practice rather than just a technical variant of the ordinary rule.
How § 42 Differs from the General ArbnErfG Compensation Formula
Outside the university context, ArbnErfG compensation for a private-sector employee-inventor is not a flat percentage of revenue. It is calculated using a valuation method built around the invention’s assessed Erfindungswert (“invention value”), adjusted by a participation factor (Anteilsfaktor) reflecting how much the invention owed to the employee’s own initiative versus the employer’s resources, technical guidance, and the employee’s position and duties. This method is elaborated in long-standing non-binding compensation guidelines (Vergütungsrichtlinien für Arbeitnehmererfindungen im privaten Dienst) that German courts and practitioners routinely reference, and it typically requires a more detailed, negotiated, and often contested calculation than the university rule’s straightforward 30%-of-revenue approach. Understanding that § 42 is a carve-out from this general method — not a re-statement of it — is the key distinction to keep straight when comparing German inventor compensation across a mixed university/industry research partnership.
Notification, Disclosure Timing, and the Academic-Freedom Carve-Out
ArbnErfG’s general disclosure obligations (prompt, written notification of a service invention to the employer) apply to university inventors too, but § 42 preserves specific protections tied to academic practice:
- Publication rights. A university inventor may disclose a service invention through ordinary teaching and research activity (a conference presentation, a paper, a thesis) without needing the university’s prior consent, provided they give the university advance notice — commonly cited as roughly two months — so the institution has a realistic window to file a patent application before the disclosure becomes prior art.
- A right to decline early reporting tied to academic freedom. Unlike a typical private-sector employee, a university researcher is not automatically obligated to report every invention to the institution the moment it is conceived; German commentary ties this specifically to constitutional academic-freedom protections. If the researcher later decides to pursue publication or exploitation, however, they must then notify the university.
- A retained non-exclusive use right. Even after the university formally claims an invention, the inventor keeps a non-exclusive right to continue using it in their own teaching and research — the invention’s ownership moves to the institution, but the researcher is not locked out of using their own work academically.
Why This Matters for Research Administrators Outside Germany
ArbnErfG’s university rule is a routine consideration wherever a non-German institution collaborates with a German university on inventive research, co-owns resulting IP, or licenses a technology that includes a German co-inventor:
- Joint-invention and consortium agreements. A collaboration or consortium agreement involving a German university co-inventor should account for § 42’s flat-percentage obligation running to that inventor specifically, distinct from whatever royalty or revenue-sharing structure the agreement sets between the institutions themselves — the two are not the same payment.
- Licensing due diligence. A licensee negotiating with a German technology licensing office is not a party to the § 42 obligation, but understanding that it exists helps explain why a German university’s minimum acceptable royalty terms, or its urgency around disclosure timing before a researcher publishes, can look different from a U.S. counterpart’s, where invention disclosure and inventor compensation follow a different statutory logic entirely (typically institutional policy rather than a national statute setting the split).
- Comparing institutional IP regimes. § 42 is a useful reference point when comparing how different research systems allocate university-invention ownership and reward: contrast it with jurisdictions that retain some form of professor’s privilege (see CASRAI’s Professor’s Privilege entry) versus the U.S. model, where inventorship, ownership, and inventor-compensation policy are set institution-by-institution against a Bayh-Dole federal-funding backdrop rather than by a single national compensation statute.
Frequently Asked Questions
Is the 30% figure the same for every German employee-inventor, or just university researchers?
Just university researchers, under § 42 ArbnErfG’s specific rule for higher-education institutions. Employee-inventors outside the university system are compensated under the general ArbnErfG formula (invention value × participation factor), not a flat percentage.
Does the 30% apply to profit or to gross revenue?
The statute ties compensation to gross revenue the university generates from exploiting the invention (for example, licensing income), not to net profit after the institution’s own costs.
What happened to Germany’s “professor’s privilege”?
It was abolished for service inventions in a reform that took effect 7 February 2002, which brought university researchers under the general ArbnErfG employer-claim structure and introduced § 42 as the university-specific compensation rule described above.
Can a university researcher keep an invention private and never disclose it to the institution?
German commentary on § 42 describes a qualified right, tied to academic freedom, to decline early reporting — but if the researcher later moves toward publication or exploitation, notification to the university is then required.
Does § 42 apply to non-university public research organizations like Fraunhofer or Max Planck institutes?
§ 42’s own text is framed around teaching and research staff at institutions of higher education specifically. Whether and how it extends to researchers at Germany’s other major public research organizations, and to third-party-funded research more broadly, has been a genuinely discussed question in German legal-practice literature — this is a point to confirm with German patent counsel for a specific institution rather than assume.
Sources and Further Reading
Primary source: Gesetz über Arbeitnehmererfindungen (ArbnErfG), § 42, as published on the German federal government’s official law portal, gesetze-im-internet.de. This guide describes the statutory framework at a general level for research-administration purposes and is not a substitute for advice from German patent counsel on a specific invention, collaboration, or licensing situation.
