Again, I am not a lawyer and I don't play one on the internet.. but in my understanding...
For regular patents, they usually refer to a "method" or an "apparatus", meaning that it should be the way to produce the grind that is patented, or possibly that a knife with his specific grind is an "apparatus" of some sort.
There is also something called a
"design patent" in America, which covers more how things appear. (Similar protections also exist in other parts of the world, sometimes under differet names)
But also note that patents are normally national, meaning that an American patent does not automatically apply in e.g. Germany - you have to apply separately for these patents. And it is gererally considered that the US patent office plays partly by different rules ("first to invent" rather than "first to file") and that the USPTO is more sloppy while the rest of the world is more strict. In the rest of the world the requirements to getting a patent are usually high in e.g. not patenting something that is already in use. In the US, it is said to be easier to get a patent in such cases and then the parties have to fight it out in court. And you Americans with your litigations and settlements thereby open the can of worms for "patent trolls", persons who file or buy dubious generic-sounding patents and then make a living by suing people and corporations and living off setttlements that they shouldn't have gotten in the first place..
But it doesn't say patent, it says "legally protected milling to create food release". Again, assuming Majime is American, and assuming they actually have some protection, the protection might not be valid for a German knifemaker.
One fun read was a few years back in a similar case when a cable manufacturer got a patent-related cease-and-desist-letter:
https://www.audioholics.com/news/blue-jeans-strikes-backhttps://www.bluejeanscable.com/legal/mcp/