[jacobolus]

Or in pictures, this circuit is the prior art: https://patentimages.storage.googleapis.com/c5/d0/e9/e4eedeb...

And these circuits are what they are patenting: (a) https://patentimages.storage.googleapis.com/91/c4/35/775214e... (b) https://patentimages.storage.googleapis.com/a1/66/be/985aac1... (c) https://patentimages.storage.googleapis.com/a8/93/45/09b4add...