I could state that the Sury's patent about the Color Process is not a secret anymore, like for Namias' resinotype and many other historical processes. A research in the European patents database gives it in a while. The same was not possible only ten years ago, obviously.
In the same database you can find a lot of interesting (and not so...) patents. I have read with some emotion that of oilprint by Rawlings, for example. And it is also clear and well written.