In U.S. patent structure one may patent ideas, code, etc. So if they, for example, patent the root how the tokenization process is made or root how to make an ICO process with listing, it may be a problem for the market that in its core should be, at least a little bit, decentralized..
Who cares about their patents? As long as FIAT or a regulatory isn't involved their patents are meaningless. We can't block this patenting process anyway. There will be many patents based on the blockchain tech.
The whole idea of bitcoin is to make things decentralized and cut off the ties between people and the regulated FIAT system.
Blockchain technology has an extremely large number of potential applications. Often when trying to develop these, developers will use code from other systems which are already proven to be secure (like Bitcoin).
Patenting parts of blockchain technology is a problem for anyone who wants a free environment to work in. To reach its full potential, it needs to be an open community where anyone can work on it.
It's a problem for the same reason that SegWitx2 having a closed source testnet is a problem. Open contributions make everything work better.