In a steering patent, the independent claim almost always answers one question: what happens when something fails? ZF Automotive UK's grant US12651984B2, "Dual motor drive assembly" (issued June 9, 2026), answers it structurally — with two motors. Its CPC classifications, B62D 5/006 (power-assisted steering using electric power) and B62D 5/0409 (electric power-assisted steering for vehicles), plus H02P 5/753 (control of two motors), confirm this is a vehicle-steering actuator, not a generic industrial drive.
Why two motors matters is the whole point of the grant. Steer-by-wire removes the mechanical link between the steering wheel and the road wheels — there is no column, no shaft, only electronics and an actuator. That is a profound packaging and design freedom, but it creates a single point of failure: if the actuator dies, the driver has no fallback. The industry's answer is redundancy, and a dual-motor assembly is one concrete form of it. If one motor or one half of the control electronics fails, the second can continue steering at reduced authority, satisfying the fault-tolerance requirement that makes column-less steering certifiable.
Read the claim for what is genuinely novel versus what is defensive. Dual-motor and dual-winding actuators exist in prior art; the inventive position in this grant is the specific drive-assembly construction — how the two motors are arranged and jointly controlled, captured by the H02P 5/753 dual-motor-control classification and the B62D steering codes together. The independent claim defines the assembly; the dependent claims add the control and packaging specifics that constitute the moat. Calling this "ZF patented steer-by-wire" would be the abstract-as-claim error; the scope is the actuator architecture.
The assignee tells you where in the supply chain this sits. ZF is a tier-1 supplier, not an automaker — it sells steering systems to many manufacturers. A steering-redundancy patent held by a tier-1 is a licensing-and-standardization signal: the redundancy approach is likely to appear across multiple brands rather than in one captive platform. For portfolio analysts, supplier-held B62D patents are the ones most likely to define the de facto industry approach.
Steer-by-wire is the reason the B62D class is worth watching right now. The transition from mechanical columns to by-wire actuation rewrites the steering IP landscape, and the redundancy claims — like this dual-motor assembly — are the enabling patents that make the transition safe enough to certify. The aspirational filings describe column-less cars; the enabling ones, like this grant, describe the failover hardware that makes them legal.
The grounded takeaway: a granted dual-motor steering assembly from a major tier-1 is a concrete step toward production steer-by-wire, and the CPC trail (B62D 5/006, B62D 5/0409, H02P 5/753) is exactly where to look for the rest of the redundancy patents that will follow it.