Read claim 1, not the title. The title of US12667974B2 — "Head and neck assembly of a humanoid robot," granted June 30, 2026 and assigned to Figure AI — fences off nothing by itself. What the independent claims recite does. And the first thing to establish about this record is its status: it is an issued grant, not a published application. The claim language quoted here is the coverage as allowed by the examiner, not a filing awaiting prosecution. That changes how the document should be read — this is fixed scope, not a moving target.

The patent carries three independent claims, and they fence three different things. Claim 1 is directed to a humanoid robot whose head portion has a head housing built from a first shell and a second shell that couple to define a head volume, with an electronic assembly inside that does three specific things: a component emits light through the first shell, a sensor obtains data through the first shell, and an inertial measurement unit sits within the housing. The limitation to watch is the shell doing double optical duty — the same first shell is recited as the path for both emitted light and inbound sensor data, and it must be curved along both the sagittal plane and a plane parallel to the transverse plane. This is a structural claim about a single transmissive, compound-curved shell over a sensor and a light source, with an IMU captured inside the same housing.

A humanoid robot comprising: a sagittal plane and a transverse plane; an upper region including: (i) a torso, (ii) a pair of arm assemblies coupled to the torso, and (iii) a head and neck assembly coupled to the torso and having: a neck portion; and a head portion coupled to the neck portion and including: a head housing assembly including: (i) a first shell having a tinted appearance, a dioptric power of less than 0.25 diopters, and including an outer surface that is curved along the sagittal plane and a plane that is parallel with the transverse plane, and (ii) a second shell coupled to the first shell to define a head volume between the first and second shells; and an electronic assembly including a sensor positioned within the head housing assembly and configured to obtain data through an extent of the first shell; and a lower region coupled to the upper region and spaced apart from the upper region, the lower region including a pair of legs.— Head and neck assembly of a humanoid robot, US12667974B2

Three independent claims, three different limitations

Claim 10, quoted above, takes a different tack. It drops the explicit light-emitting component from the independent recitation and instead pins the first shell to two optical properties: a tinted appearance and a dioptric power of less than 0.25 diopters. That second limitation is the notable one. Dioptric power is a measure of optical bending; specifying that the shell bends light by less than a quarter diopter is a way of claiming a tinted cover that a camera can shoot through without meaningful distortion — a dark visor that reads as opaque styling to a person but functions as a near-flat window to the sensor behind it. The claim couples that tinted, low-power shell to a sensor positioned to obtain data through an extent of it. Where claim 1 fences the shell by what passes through it, claim 10 fences it by its measured optical character.

Claim 17 moves to geometry. It recites a first cover and a second cover defining a head volume, and then two cameras — a first camera with a first line of sight and a second camera with a second line of sight — with two express limitations: the two cameras are not coupled to the same PCB, and their lines of sight lie in a plane that is substantially perpendicular to the sagittal plane. Separating the cameras onto different boards and fixing the plane of their sightlines is a claim about a defined stereo-style arrangement, and it reads on the physical layout rather than on any image-processing method. Three independent claims, then, three separate footholds: a light-and-data shell with an IMU, a tinted low-diopter shell, and a two-camera geometry.

The dependent claims add the granular limitations an implementer would care about. Among them: a camera line of sight angled between 5 and 25 degrees below horizontal when the head faces forward (claims 8 and 11); an internal fan expelling air through sections in the neck portion, in one variant concealed by a deformable cover (claims 6 and 14); a microphone within the head volume able to detect where a sound originated (claim 5); a shell that substantially obscures the sensor from an external viewpoint (claim 2); an illuminated region adjacent to the shell's rear edge whose color conveys information to a nearby person (claims 9, 16, 19); and head-proportion limitations, including that the first shell occupies less than 50% of the head's surface area (claim 13) and that the head height exceeds its width (claims 26–28). The dependents fence the operational details — sensor cant, cooling path, status signaling — around each independent claim.

Where it sits in the classification

The CPC placement locates the grant in the landscape. It is classified under B25J 11/001 (manipulators for specific applications), B25J 9/0009 (humanoid robots within the programmable-manipulator family), and B25J 19/023 (arrangements for sensing on manipulators). That is the manipulator-and-humanoid neighborhood — the B25J class that covers robot structure and on-robot sensing — rather than a G05D autonomy-control class or an optics class, which is consistent with claims directed to the physical head assembly and its integrated sensors rather than to a perception algorithm. In portfolio terms, the same assignee has other issued head-assembly grants nearby: US12403611B2, whose independent claim recites the head housing in terms of arc lengths around a display, and US12365094B2, directed to an illumination assembly lighting the seam between the frontal and rear shells. The head has been claimed across several issued patents, each fencing a different structural feature of the same subsystem.

Reading further out, the assignee's granted body claims other regions of the machine on their own independent claims — a wrist-and-thumb end effector in US12605824B2, a central-region actuator layout in US12583126B2, and a hip-and-knee kinematics arrangement in US12611766B2. For anyone mapping who holds structural humanoid IP, this grant adds a set of issued, fixed claims over the head-and-neck subsystem specifically. What those claims cover is exactly what is recited above and nothing broader; whether a given competing head design falls inside them is a limitation-by-limitation question against claims 1, 10, and 17, which is the only reading the record supports.