TL;DR - these are RF lenses, not RF-S (but not for the reason suggested by
@amfoto1 )
I am not so sure these patents are for RF-S lenses. I think they may be full frame capable RF.
I agree that these are RF (full frame) designs, but not for the reason you suggest.
The reason I think so is the stated "half angle of view" of each lens. Take the 24mm as an example. A full frame 24mm lens has roughly 82 degree angle of view and the patent states exactly half that: 41 degrees.
That’s why it’s called a
half angle of view. Canon’s optical design patents specify angles, element curvatures, etc., for just half a lens because lenses designs are symmetrical. A lens design with a specified half angle of view of 41° has a full AoV of 82° as you’d expect for a 24mm lens.
Also, lens design parameters like focal length and AoV (or hAoV) are intrinsic to the lens – they don’t get adjusted based on the sensor size for which the lens is intended.
Why do you think these are RF-S lenses?
They are suggested to be RF-S because of the image height, which is the radius of the image circle (1/2 the diagonal of the intended sensor). A FF sensor has a 43.2mm diagonal, meaning FF lens designs have an image height of 21.6mm. These designs all fall short of that value, meaning the image circles won’t fully cover a FF sensor.
However, an APS-C image circle is 31.2mm in diameter, meaning a 15.6mm image height – these lenses all have images circles too big for APS-C. In wide angle lenses like these, the image circle is limiting (it’s not for telephoto lenses, which is why there aren’t EF-S telephoto lenses). If these are RF-S lenses, too-large image circles mean lenses that are unnecessarily larger and heavier. Canon may not care about that, but more glass and more plastic than minimally needed means higher production costs and thus lower profits – and for damn sure Canon cares about that.
Some time back, CRguy posted about
patents for RF APS-C pancake lenses. The lens that CRguy called an RF-S 16mm f/2.8 has an image height of 18.2mm, and in fact that patent design is the RF 16mm f/2.8 lens that can be purchased today (which is obvious when the lens diagram from the patent example is superimposed on the block diagram of the actual RF lens).
The reason the image circle can be too small for FF is that the lenses have significant geometric (barrel) distortion in the design. Correcting barrel distortion stretches the corners of the image, so after correction the FF corners will be filled in, just as they are on the 16/2.8.