Most propulsion is bespoke; Enpulsion's pitch is propulsion you can order from a catalog. US11365726B2, granted to Enpulsion GmbH on June 21, 2022, claims simply an "ion thruster" — and the simplicity of the title belies the productization strategy behind it.
The CPC is tightly focused: F03H 1/0012 and F03H 1/005, both within the plasma/ion electric-propulsion family. No bus-integration or operations codes — this is a device claim about the thruster itself.
The mechanism is field-emission electric propulsion. A liquid-metal propellant (typically indium) is fed to emitter tips, and a strong electric field pulls ions off the surface and accelerates them to produce thrust. Indium is solid at room temperature and storable, the emitters scale down well, and the whole unit can be made compact and modular — which is precisely why FEEP suits the smallsat market Enpulsion serves.
The strategy this record encodes is mass production. By patenting and standardizing a modular thruster, Enpulsion sells propulsion as a predictable, repeatable part rather than a custom engineering program. Filing velocity around a single architecture is intent — the company is fencing the thruster it intends to ship by the thousand.
The caveat: an "ion thruster" claim is necessarily about Enpulsion's specific FEEP implementation and its dependent details, not ion propulsion at large, which has decades of prior art. The signal for analysts is the productization play itself — a European specialist treating electric propulsion as a commodity component, and patenting accordingly.