Meaning of a ubiquitous sentence in patents

Obvious does have its usual meaning:

adjective

• easily perceived or understood; clear, self-evident, or apparent

[ODO]

A quirk of patent law is that obvious things cannot be patented. The sentence is saying that everything about the invention is either obvious (and therefore not patentable) or included in the application and therefore part of the patent.

What the sentence does is limit the patent to what is explicitly stated in the application, and by saying that everything else is "obvious", seek to stop anyone else applying for a patent for the invention based on some other benefit not listed.