Here is the look of Google Patent Search today, which looks like the screen shots from 2015:
A new Google Web Search Help thread has a few complaints:
Re: Google Patents - The 'old' site www.google.com/patents is no longer accessible. As of this morning, when the 'old' link is accessed, you are automatically redirected to the 'new' google patents - patents.google.com. Nobody likes the new website. It is cumbersome and full of undesired search tools. The old website was simple and easy to use. How can I access the 'old' google patents??
As I covered at Search Engine Land when it launched in 2015, the new design and features should give you access to more filters. But it seems like maybe something is missing or people do not like change.
Forum discussion at Google Web Search Help.