If these weren't depressing they'd be funny. For those who don't know the patent & trademark office (PTO) defines "obvious" as described in a prior patent or, sometimes, an academic paper. Even if everybody in the field has been doing the same thing for years it isn't "non obvious" unless somebody wrote to the PTO about it. But since it's obvious in reality those nobody except crooks bother to. The whole system is ri…
The reason sometimes known things are allowed through is because the patent offices can find no proof that it is well known in the form of a single document before something can be called not novel. In some other juristrictions, common general knowledge in the art is more often used when it's known that something is already routine. even if there's nothing that clearly shows is, simply because it's so common.