Well that’s an interesting Canon patent application. One that might get into production.

Canon patent application 20200073213 (USA) describes a battery grip with adapter that fits various cameras.

From the abstract:

An accessory attachable to an image pickup apparatus through an adapter includes a body portion configured to contact the adapter, a screw engageable with a screw hole in the image pickup apparatus through a through-hole formed in the adapter, an operation unit configured to move the screw relative to the body portion. The screw is movable in a plurality of directions including a direction along an optical axis of the image pickup apparatus and a direction orthogonal to the optical axis in accordance with an operation of the operation unit by a user.

From the patent literature:

SUMMARY OF THE INVENTION

[0004] The present invention provides an accessory and camera system, each of which is generally attachable to a plurality of types of camera bodies.

[0005] An accessory according to one aspect of the present invention attachable to an image pickup apparatus through an adapter includes a body portion configured to contact the adapter, a screw engageable with a screw hole in the image pickup apparatus through a through-hole formed in the adapter, an operation unit configured to move the screw relative to the body portion. The screw is movable in a plurality of directions including a direction along an optical axis of the image pickup apparatus and a direction orthogonal to the optical axis in accordance with an operation of the operation unit by a user. A camera system including an image pickup apparatus, and the above accessory also constitutes another aspect of the present invention.

[0006] An accessory according to another aspect of the present invention attachable between a battery grip and an image pickup apparatus includes a body portion configured to contact the image pickup apparatus, and a first positioning member configured to position relative to the image pickup apparatus. The body portion has a through-hole into which a screw of a battery grip is inserted in order to fix the battery grip to the image pickup apparatus.

More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these:

• A 100-400mm f/5.5-7.1 lens for APS-C cameras. EOS M or DSLR?
• RF 17-70mm lens for EOS R system
• IBIS coming to the EOS M and PowerShot lineup?
• Patent Application: mirrorless camera with large display and virtual control wheel
• Patent Application: IBIS and Lens IS Working Together
• Patent application for high speed mirror movement and control
• Patent application for an RF 14-28mm f/2 lens
• Patent application for an RF 50mm f/1.8 lens
• Patent application for a smart lens cap
• Patent application for celestial auto-focus
• Patent application describing a Pop-Up Flash With LED
• Patent application describing the optical formula for a RF 70-300mm F/4-5.6 IS lens for EOS R systems
• Patent application describing how to improve burst rate by compressing raw files
• Patent application describing a new way to review photos from a sequential shot
• Patent application that describes technology to improve wireless communication while reducing power consumption
• Patent application to spot and reduce moire artefacts in image data
• Patent application for weather sealed lens adapter
• Patent application for AI powered predictive camera control system
• Patent application for 18-55mm kit lens with LCD display
• Patent application to reduce noise in image files