Google just announced the retirement of some deprecated but pretty useful search API's, like Google Patent Search API, Google News Search API, Google Blog Search API, Google Video Search API and Google Image Search API and forwarded to the Custom Search API as the recommended alternative.
What would now be the syntax for a patent search with the custom search API?
e.g. for https://developers.google.com/patent-search/?utm_campaign=chrome_deprication_api_011516&utm_source=gdev the patent-search uri will be gone.
The javascript API is the google.search.PatentSearch class, which I assume will also be removed.
And I don't see anything like Patent, Video or Images in the https://developers.google.com/custom-search/docs/ref_prebuiltlabels
The answer at Python module for searching patent databases, ie USPTO or EPO looks like it would be helpful to you. It gives a Python example of doing a Google patent search using the custom search API.