The patents refer to the concept of anti hair tangling using conical brush bars, irrespective of the specific configuration or application. The evidence shows this concept was invented and patented by Dyson as far back as 2018. Over a year after the patent was made public, Panasonic then patented the same approach but used in a cleaner head. But they only patented it in Japan, rather than globally, since no Dyson patent had been registered at that time there and so it wouldn't be rejected. They have not since patented it more widely—and it's obvious why, since it would likely be rejected now due to infringement. It looks very much like a sneaky undercut. Kudos to them for succeeding. Regardless, evidence is quite clear; Dyson were the first to invent this fundamental concept, regardless of the specific configuration of implementation. It's now heavily patented and so other dupes are highly unlikely to appear until about 2038.
The Pencilvac is a floor sweeper primarily aimed at smaller Japanese homes with hard floor. The Dyson Piston currently only released in Korea uses conical brush bars in a cleaner head suited for all floor types, completely solves hair wrapping, and doesn't suffer from the issues apparent in the Panasonic model.