Novelty and non-obviousness are requirements for a utility patent to be granted in the United States.
This post explains the meaning of novelty and non-obviousness. I have based this on my answer to a Quora question. Please see What exactly defines novelty and non-obvious in regards to patenting?
USPTO on Novelty and Non-obviousness
I have copied, below (emphasis added), portions of what the U.S. Patent and Trademark Office says about these criteria. For more information, please see (more…).