Some claims fence a part; this one fences a robot. Boston Dynamics' grant US12251831B2 ("Integrated mobile manipulator robot," issued March 18, 2025; inventors Michael Murphy, Benjamin Zelnick, Malik Hansen, Vadim Chernyak, Christopher Everett Thorne, Alex Perkins) carries a CPC stack that walks the whole machine: B25J 5/007 (the mobile base), 9/06 and 17/0283 (the arm and its joints), 9/1666 (path control), 15/0616 (the suction gripper). It's the integration that's claimed.

The mechanism is the system itself — how a manipulator arm is mounted on and coordinated with a mobile base so the combined machine can move to a location and manipulate there. This is the architecture of Boston Dynamics' Stretch-class warehouse robot: a base that drives into a trailer or aisle and an arm that unloads or picks. The breadth of the CPC reflects that the invention spans subsystems, not a single component.

“A robot includes a mobile base, a turntable rotatably coupled to the mobile base, a robotic arm operatively coupled to the turntable, and at least one directional sensor. An orientation of the at least one directional sensor is independently controllable.”— U.S. Patent No. 12,251,831 source

For the manipulation beat, integrated-mobile-manipulator system claims are the high-value end of robotics IP because they fence a product category. A competitor can't avoid them by swapping one part — they'd have to architect a different machine. That said, system claims that recite many elements can also be narrower than they look: the more required elements, the easier it is to fall outside by omitting one.

From a portfolio angle, this is the keystone of Boston Dynamics' 2024–2025 manipulation cluster, sitting above the gripper-mechanism grant (US12103164B2, 2024), the dynamic-mass-estimation control grant (US12240105B2, 2025), and the perception-mast grant (US12186919B2, 2025). The company has, in two years, fenced the hand, the weighing control, the sensor head, and now the integrated whole — a deliberate, layered product-IP stack.

Caveats. Mobile manipulators have prior art going back decades (the concept is old); the grant turns on the specific integration and coordination recited in claim 1, not on the idea of putting an arm on a base. The element-rich classification means scope depends on which elements are mandatory. Read the independent claim for the required configuration.

For the file: the keystone system claim of Boston Dynamics' mobile-manipulation portfolio. Pull US12251831B2 with the gripper, mass-estimation, and perception-mast siblings in the patent record; read claim 1 for the mandatory integration elements — the whole cluster is the product fence.